Technical_Exhibit_11_Chiller_B6110.pdf

M7-5

Seoul Air Conditioning Inc

Project Simulation Center, USAG Humphreys, Korea Date Feb/14/2014

For Approval

For Information

Item Magnetic Bearing Centrifugal Chiller For Notice For Confirmation

Print For Reply 2-1. Specification For Review

23 64 10 - #1.2 WC WATER CHILLER

M7-6

MAGNITUDE™Water Cooled Centrifugal Chiller

Job Information Technical Data Sheet Job Name Simmulation Center Date 2/18/2014 Submitted By YH Yoo Software Version 09.10 Unit Tag Centrif 003 Unit FPA# AUTO_40

Unit Overview

Model Number Capacity kW

NPLV

COP

Voltage Drive Type LEED EA Credit 4

WME0500S 1690.0 11.008 460 V / 60 Hz VFD/UM Pass

Unit Model Number: WME0500SSM2R

Approval: ETL / cETL only Vessel Code: ASME

Compressor Quantity Capacity Control Refrigerant Type Refrigerant Weight 1 VFD / Inlet Guide Vanes R134a 495 kg

Evaporator

Entering Fluid Temperature Leaving Fluid Temperature Fluid Type Actual Fluid Flow Minimum Fluid Flow

15.00 °C 7.00 °C Water 50.53 l/s 19.8 l/s

Length Diameter Number of Passes

Tube Fouling Factor Material Wall Thickness

3.7 m 76.2 cm 2 Copper 0.635 mm 0.01761 °C.m²/kW

Condenser

Entering Fluid Temperature Leaving Fluid Temperature Fluid Type Glycol Concentration Fluid Flow

29.50 °C 34.50 °C Propylene Glycol 30 % 98.10 l/s

Length Diameter Number of Passes

Tube Fouling Factor Material Wall Thickness

3.7 m 66.0 cm 2 Copper 0.635 mm 0.04403 °C.m²/kW

Unit Performance Design

Capacity kW

Input kW

Efficiency

COP

RLA

A

NPLV

COP

Part Load Efficiency Evaporator Fluid Condenser Fluid 75%

COP

50%

COP

25%

COP

Pressure Drop kPa

Entering Temperature

°C

Pressure Drop kPa

Leaving Temperature

°C

1690.0 264.9 6.381 370 11.008 8.787 12.968 11.765 27.5 15.00 32.2 34.50

Performance Points Rated at AHRI Condenser Relief

Point # % of Design Load

Capacity kW

Input kW

Efficiency

COP

RLA

A

Evaporator Fluid Condenser Fluid Flow l/s

Temperature Pressure Drop kPa

Flow l/s

Temperature Pressure Drop kPa

Entering °C

Leaving °C

Entering °C

Leaving °C

1 100.0 1,690.0 264.9 6.381 370 50.53 15.00 7.00 27.5 98.10 29.50 34.50 32.2 2 90.0 1,521.0 211.4 7.195 301 50.53 14.20 7.00 27.4 98.10 27.27 31.70 31.5 3 80.0 1,352.0 165.0 8.197 240 50.53 13.40 7.00 27.4 98.10 25.03 28.91 30.6 4 70.0 1,183.0 123.5 9.576 190 50.53 12.60 7.00 27.4 98.10 22.80 26.15 29.6 5 60.0 1,014.0 90.0 11.269 143 50.53 11.80 7.00 27.4 98.10 20.57 23.41 28.6 6 50.0 845.0 65.2 12.968 106 50.53 11.00 7.00 27.3 98.10 18.33 20.69 27.3 7 40.0 676.0 53.4 12.670 88 50.53 10.20 7.00 27.3 98.10 18.33 20.23 27.2 8 30.0 507.0 41.7 12.168 70 50.53 9.40 7.00 27.3 98.10 18.33 19.77 27.1 9 20.0 338.0 34.3 9.848 59 50.53 8.60 7.00 27.2 98.10 18.33 19.31 27.0 10 10.0 169.0 22.9 7.397 42 50.53 7.80 7.00 27.2 98.10 18.33 18.84 26.8

M7-18

MAGNITUDE™Water Cooled Centrifugal Chiller

Physical Evaporator

Inlet Location Header Type Header Material Tube Sheet Material Design Pressure (Waterside)

Right Flanged Carbon Steel Carbon Steel 1 MPa

Condenser

Inlet Location Header Type Header Material Tube Sheet Material Design Pressure (Waterside)

Right Flanged Carbon Steel Carbon Steel 1 MPa

Electrical Voltage RLA LRA Power

Connection Power Factor MCA MOCP

460 V / 60 Hz / 3 Phase 364 A 401 A Single Point 0.90 458 A 640 A

Drive Type Model Location Harmonic Distortion Enclosure Type Motor Protection

VFD Integral Unit Mounted Standard Nema 1 Standard Circuit Breaker Short Circuit Current Rating Approval

35 KAIC 35 kA ETL, ETLc

Sound (with Insulation) Sound Pressure

63 Hz 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz Overall 75% Load 50% Load 25% Load

41.0 58.0 67.0 72.0 73.0 71.0 83.0 71.0 84.5 79.6 78.6 80.4 Sound Pressure (dB) measured in accordance with ANSI/AHRI Standard 575 2008 (‘A’ weighted)

Options Basic Unit

Packaging: Bagging only Insulation

Thermal: 3/4" on evap shell, cold surfaces and connection & return heads Control

Communication Protocol: LonMark Drive

Ground Fault Protection: Included Power Meter: Amps, Volts, Power Factor and Input Power

AHRI Certification

Certified in accordance with the AHRI Water Cooled Water Chilling Packages Using Vapor Compression Cycle Certification Program, which is based on AHRI Standard 550/590 (I P) Certified units may be found in the AHRI Directory at www.ahridirectory.org.

M7-19

4 IM 1033-4

Introduction IntroductionFigure 1: Required Lifting Arrangement

General Description Daikin McQuay Magnitude model WME frictionless centrifugal chillers are complete, self-contained, automatically controlled fluid chilling units. Each unit is completely assembled and factory tested before shipment. Model WME is cooling-only.

Each Magnitude Model WME unit features one compressor connected to a condenser and evaporator. The chillers use refrigerant R-134a to reduce the size and weight of the package compared to negative pressure refrigerants and since R-134a operates at a positive pressure over the entire operation range, no purge system is required. The controls are pre-wired, adjusted and tested. Only normal field connections such as piping, electrical and interlocks, etc. are required, thereby simplifying installation and increasing reliability. Most necessary equipment protections and operating controls are factory-installed in the control panel.

The chillers are designed for indoor, non-freezing locations. If indoor freezing temperatures are possible, special procedures described in this manual must be followed to drain the unit.

Outdoor locations require a special weatherproof design. For WME chillers selected with optional Retrofit Knockdown, refer to IM Knockdown, available on www.daikinmcquay.com for detailed dimensions and installation instructions.

Application The procedures presented in this manual apply to standard Model WME chillers. Refer to the Operating Manual, OMM 1034 for detailed information about chiller operation and the MicroTech-E unit controller.

All Daikin McQuay centrifugal chillers are factory tested prior to shipment and must be initially started at the job site by a factory trained McQuay service technician. Failure to follow this startup procedure can affect the equipment warranty.

The standard limited warranty on this equipment covers parts that prove defective in material or workmanship. Specific details of this warranty can be found in the warranty statement furnished with the equipment.

Figure 2: Nomenclature

Li fting Points

Lifting Point

Lifting Point (Outside Corner Hidden)

VFD Power Panel

Power Cable Entry

Note: This drawing is for general reference only. Refer to dimension drawings for actual location of components.

On some units the control panel and interface panel may be on the opposite side, adjacent to the VFD power panel.

W M E 0500

Water-cooled Magnetic Bearing Vintage

Chiller Model

M7-25

IM 1033-4 13

Electrical Data Electrical Data

Electrical

Power Wiring Wiring, fuse and wire size must be in accordance with the National Electric Code (NEC).

Important: Voltage unbalance not to exceed 2% with a resultant current unbalance of 6 to 10 times the voltage unbalance per NEMA MG-1, 1998 Standard. This is an important restriction that must be adhered to.

Power entrance is on top of the enclosure. Remove cover plate when making hole to avoid entrance of foreign material into the enclosure.

Power connection lug size range is 3/0 AWG - 500kcmil, three conductors per phase

The ground connection is a stand-off adjacent to the circuit breaker, marked "MGND". Field provide a 3/8-16 x ¾ in.

screw with a flat washer and lock washer and appropriate "O" terminal.

Use only copper supply wires with ampacity based on 75°C conductor rating. (Exception: for equipment rated over 2000 volts, 90°C or 105°C rated conductors should be used).

The VFD nameplate will indicate the RLA setting required in the MicroTech-E controller. The RLA setting is for the VFD output amps not the input amps. Follow name plate values for output RLA.

Power Factor Correction Capacitors Do not use power factor correction capacitors with WME chillers. They can cause harmful electrical resonance in the system. Correction capacitors are not necessary since VFDs inherently maintain high power factors.

Control Wiring The control circuit power on Magnitude model WME chillers is supplied by the unit-mounted VFD.

Figure 10: Unit Control Panel

CAUTION

Qualified and licensed electricians must perform wiring.

Shock hazard exists.

CAUTION

Connections to terminals must be made with copper lugs and copper wire.

M7-26

Operation & Maintenance Manual OMM 1034-4

Group: Chiller

Part Number: 331499501

Effective: November 2012

Supersedes: July 2012

Magnitude Magnetic Bearing Centrifugal Chillers Model WME 0500 - 700

Software Version: 4.33.1

M7-27

Sung-Am 텍스트 상자 23 64 10 - 1,2

10 OMM 1034-4

Component Description Operator Interface Touch Screen The operator interface touch screen (OITS) is the primary device by which commands and entries into the control system are made (a laptop computer can also be used). It also displays all controller data and information on a series of graphic screens.

The control panel contains a USB port that can be used for loading information to and from the control system including download of trend log data and uploading software upgrades.

The OITS panel is mounted on a moveable arm to allow placement in a convenient position for the operator. There is a screen-saver programmed into the system. The screen is reactivated by touching it anywhere on the front surface.

Unit Controller There is one unit controller mounted on the chiller which is the primary interface to the user and for field I/O connections.

Unit and compressor on/off switches are mounted in the unit controller panel located adjacent to the OITS panel. They are designated 1 for on and O for off. The compressor on/off switch should only be used when an immediate stop is required since the normal shut down sequence is bypassed.

There is a unit enable switch located on the left outside of the panel that causes a controlled shutdown of the compressor.

The unit controller's primary function is processing data relating to the entire chiller unit operation, as compared to data relating to the compressor operation. The unit controller processes information and sends data to other controllers and devices and relays information to the OITS for graphic display.

The following functions operate in the unit controller:

User interface BAS interface Field I/O; pumps, alarm contact, remote start/stop, tower control Chiller I/O; water temperatures, EXV control, condenser pressure Data trending Chiller alarm handling Alarm display

Figure 5, Unit Control Panel

CPU Bracket

(1) USB Port on Top of Bracket

External Control Wiring Entry Knockouts (4)

(2) USB Ports Under Bracket

Unit Switch Normal Shutdown

Comp. Switch Immediate Stop

External Normal Shutdown Switch

Ethernet Port

M7-36

OMM 1034-4 11

Motor/Compressor Controller The following functions operate in the compressor controller:

Bearing Control Suction/Discharge Temperature and Pressure IGV control Speed Control RPM sensing Load Control Compressor Alarm Handling Motor Temperature control Compressor staging and load balancing on multi-chiller installations

VFD Controller The following functions operate in the VFD controller:

Controls motor according to speed setpoint VFD heat sink temp control (solenoids) High Pressure switch monitoring Ground fault protection (optional) Over-current protection VFD alarm handling Control power distribution Regenerative power in case of power loss Short circuit protection

VFD Description:

The VFD has several main components or sections:

1) Input power section:

Circuit breaker ( standard) Ground fault detection ( optional) Power meter ( optional)

2) Control power section:

120VAC

24VDC, 12VDC, 15VDC

300VDC (intermediate power supply)

3) Power conditioning Main power autotransformer – used for low harmonics version or where buck/boost is required.

- ( 460V low harmonics option, 575V, 380V ) EMI filters (optional), use where low-level EM emission from the VFD panel are undesirable.

Line Reactors - standard

4) Heat sink assemblies: ( main power control assembly) M2 version – 1 heat sink assembly M3, M4 version – 2 heat sink assemblies

The main purpose of the M3 version with the transformer is to provide lower harmonics than the standard M2 system.

M7-37

12 OMM 1034-4

Key VFD Control Signals VFD enable from Compressor to VFD (relay contact) Speed reference (command speed) from compressor to VFD (4-20 mA analog) Compressor RPM sensor output to VFD (digital pulse) VFD amps to Compressor (Ethernet)

The remaining chiller data, setpoints, and control signals travel between the chiller, compressor, and VFD using an Ethernet network.

Inputs and Outputs Unit Controller Table 1, Unit Controller, Analog Inputs # Description Wiring Source Signal Range

1 Entering Evaporator Water Temperature Chiller

NTC

Thermistor

(Note 1) 10k@25°C -40 to 125°C

2 Leaving Evaporator Water Temperature Chiller

NTC

Thermistor

(Note 1) 10k@25°C -40 to 125°C

3 Entering Condenser Water Temperature Chiller

NTC

Thermistor

(Note 1) 10k@25°C -40 to 125°C

4 Leaving Condenser Water Temperature Chiller

NTC

Thermistor

(Note 1) 10k@25°C -40 to 125°C

5 Entering Heat Recovery Water Temperature Chiller

NTC

Thermistor

(Note 1) 10k@25°C -40 to 125°C

6 Leaving Heat Recovery Water Temperature Chiller

NTC

Thermistor

(Note 1) 10k@25°C -40 to 125°C

7 Liquid Line Refrigerant Temperature Chiller

NTC

Thermistor (Note 1)

10k@25°C -40 to 125°C

8 Condenser Refrigerant Pressure Chiller Sealed Gage Transducer

0.3 to 4.5

VDC

-20.3 to 410 psi

9 Evaporator Water Flow Rate Field Water Flow Sensor

4 to 20 mA Current

0 to 10,000 gpm

10 Condenser Water Flow Rate Field Water Flow Sensor

4 to 20 mA Current

0 to 10,000 gpm

11 Reset of Leaving Water Temperature Field BAS 4-20 mA

Current 0 to100%

12 Demand Limit Field BAS 4-20 mA Current 0-100 %RLA

Note 1: Thermistor curves according to standard thermistor probe specification.

M7-38

OMM 1034-4 13

Table 2, Unit Controller, Digital Inputs

# Description Wiring Signal Source States –

OPEN/CLOSED

1 Front Panel “Stop/Auto” Switch Chiller Isolated Switch Contacts Stop / Auto

2 Remote Start/Stop Field Isolated Switch or Relay Contacts Stop / Auto

3 Mode Switch Field Isolated Switch or Relay Contacts

Normal / Alternate Mode

4 Evaporator Water Flow Switch Chiller & Field (in series)

Isolated Flow Switch Contacts No Flow / Flow

5 Condenser Water Flow Switch Chiller & Field (in series)

Isolated Flow Switch Contacts No Flow / Flow

6 Compressor Manual OFF Switch Chiller Isolated Switch Contact Stop/Auto

Table 3, Unit Controller, Digital Outputs # Description Load Rating 1 Alarm Indicator Light 240 VAC 2 Evaporator Water Pump #1 Pump Contactor 240 VAC 3 Evaporator Water Pump #2 Pump Contactor 240 VAC 4 Condenser Water Pump #1 Pump Contactor 240 VAC 5 Condenser Water Pump #2 Pump Contactor 240 VAC 6 Cooling Tower Fan #1 Fan Contactor 240 VAC 7 Cooling Tower Fan #2 Fan Contactor 240 VAC 8 Cooling Tower Fan #3 Fan Contactor 240 VAC

Table 4, Unit Controller, Analog Outputs # Description Output Signal Range 1 Cooling Tower Bypass Valve Position 0 to 10 VDC 0 to 100% Open 2 Cooling Tower VFD Speed 0 to 10 VDC 0 to 100%

Table 5, Stepper Motor Outputs The following output is provided for stepper motor driven actuators.

# Description Motor 1 Electronic Expansion Valve 12VDC, 10VA max 2 Range Extension Valve 12VDC, 10VA max

M7-39

14 OMM 1034-4

Compressor Controller

Table 6, Compressor Controller, Analog Inputs # Description Source Signal Range 1 Compressor Suction Temperature NTC Thermistor 10k@25°C -40 to 125°C 2 Compressor Discharge Temperature NTC Thermistor 10k@25°C -40 to 125°C 3 Suction Refrigerant Pressure Sealed Gage Transducer 0.3 to 4.5 VDC -6.6 to 132 psi 4 Discharge Refrigerant Pressure Sealed Gage Transducer 0.3 to 4.5 VDC -20.3 to 410 psi 5 Rotor Pump Temperature NTC Thermistor 10k@25°C -40 to 125°C 6 Inlet Guide Vane Position Rotary Transducer 0.5 to 4.5 VDC Closed to Open 7 Motor Winding Temperature 1 NTC Thermistor 10k@25°C -40 to 150°C 8 Motor Winding Temperature 2 NTC Thermistor 10k@25°C -40 to 150°C 9 Motor Winding Temperature 3 NTC Thermistor 10k@25°C -40 to 150°C

10 Motor Case Temperature 11 Motor Gap Temperature NTC Thermistor 10k@25°C -40 to 125°C

Table 7, Compressor Controller, Digital Inputs None

Table 8, Compressor Controller, Analog Outputs None

Table 9, Compressor Controller, Digital Outputs # Description Load Output OFF Output ON 1 VFD Enable VFD Compressor OFF Compressor ON 2 Liquid Injection Solenoid (24 VDC, 20 VA max) No Injection Injection 3 Stator Cooling Solenoid (24 VDC, 20 VA max) Cooling OFF Cooling ON

Table 10, Stepper Motor Outputs The following output is provided for stepper motor driven actuators.

# Description Motor 1 Inlet Guide Vane Position 4.2VDC, 30VA max 2 Rotor Cooling 12VDC, 10VA max

M7-40

OMM 1034-4 15

Optional Harmonic Filters The optional harmonic filter is a device that reduces harmonics. It may be factory-mounted in the chiller power panel or remotely mounted in the field.

Operation The harmonic filter is a passive device and there is no operator action required for normal operation.

Cleaning Excessive accumulations of dirt on the reactor windings or insulators and capacitor terminals should be removed to permit free circulation of air and to guard against the possibility of insulation breakdown. Particular attention should be given to cleaning the top and bottom ends of the winding assemblies and to cleaning out ventilating ducts. Windings should be lightly cleaned by the use of a vacuum cleaner. If necessary a blower or compressed air may be used but pressure should not exceed 25 psi. Lead supports, tap changers and terminal boards, bushings, and other major insulating surfaces should be brushed or wiped with a dry cloth. The use of liquid cleaners is not recommended due to deteriorating effects on most insulating materials.

Periodic Inspection and Maintenance The filter has no moving or active parts and therefore requires only minimal periodic maintenance when installed in a clean and well ventilated environment. Annual maintenance is recommended. This should include:

1. Visual inspection for evidence of loose connections, dirt, moisture, rusting, corrosion, and deterioration of the insulation, varnish or paint. Observations should be made for signs of overheating and overvoltage creeping.

Corrective measures should be taken as necessary.

2. For early detection of any developing hotspots, an infrared scan can be performed while the unit is operating under its heaviest load condition.

3. The unit capacitors are equipped with an internal ‘Tear-Off’ fuse pressure interrupter to prevent explosive failure.

At the end of its service life, pressure within a capacitor will build due to the release of gases as its dielectrics breakdown. The covers on the cans are designed to expand or bulge and Tear-Off the internal fuse as this pressure builds. Capacitors should be inspected regularly and replaced when found to have an expanded cover.

CAUTION

Ensure that power to the unit is turned off and safely isolated before replacing failed capacitors or blown fuses.

4. Most units are also equipped with capacitor fuses. Capacitor fuses are intended to provide additional protection against overloading of the capacitors. A blown fuse can be detected by checking for illumination of the blown fuse indicator when this option has been purchased or by measuring the voltage across the fuse terminals while energized. If voltage is not near zero or the blown fuse indicator is on, the fuse should be replaced.

5. Measuring the current in each of the three phases of the capacitor circuit can be a quick and easy method of determining the condition of the capacitors. The capacitors can be assumed to be in good operating condition when all three phases carry approximately the same amount of load current. Measurements should be taken at the input to the capacitor distribution block and can be done at any loading condition. Phase currents that are imbalanced by more than 10%, indicate a capacitor failure or blown fuse. When the filter capacitor bank has been connected in a wye configuration (ie. Two jumpers create a common point on each set of three capacitors), locating the problem capacitor(s) can be achieved by measuring the voltage between the common neutral point of each set to ground. If the voltage difference is greater than 10 volts, at least one of the capacitors in that set has failed or has a blown fuse.

Testing should be conducted annually or whenever the unit seems to be operating in an abnormal manner. The unit is capable of continued operation with some failed capacitors or blown capacitor fuses. Harmonic mitigation performance will be sacrificed however, so it is recommended that all failed capacitors or blown capacitor fuses be replaced as soon as is practically possible after detection.

CAUTION

Service work on this device must be only be performed by technicians trained and experienced on them.

M7-41

16 OMM 1034-4

Field Wiring Data

Electrical Notes Input power options:

• 3ph 380V 50/60Hz

• 3ph 400V 50/60Hz

• 3ph 415V 50/60Hz

• 3ph 460V 50/60Hz

• 3ph 480V 50/60Hz

• 3ph 575V 60Hz

Wiring, fuse and wire size must be in accordance with the National Electric Code (NEC).

Important: Voltage unbalance not to exceed 2%.

Power Wiring

Use only copper supply wires with ampacity based on 75°C conductor rating. Connections to terminals must be made with copper lugs and copper wire.

Lug size range is: (3) 3/0 AWG - 500 kc mil.

Short Circuit Current Ratings

WME chillers are available with an optional High Short Circuit Rating HSCCR) or Ultra High Short Circuit

Motor Voltage Standard Panel

Optional High

SCCR

Optional Ultra High

SCCR

3-Ph 380V- 480V 35 kA 65 kA 100 kA

575V 25 kA 50 kA N/A

6-Ph 380V- 480V 35 kA 65 kA 100 kA

575V N/A N/A N/A

Current Rating (UHSCCR) in lieu of the standard rating (SCCR) as shown in the above table.

3-Phase vs. 6-phase Motors

WME 500 motors are designated as M2 or M3.

• "M2 motors are standard 3-phase and the VFD performs similar to a 6-pulse drive.

• "M3 motors are 6-phase (connected to a 3-phase power supply) and the VFD performs similar to a 12-pulse drive. They provide increased protection against harmonic distortion, but are not required on most applications.

WME 700 motors are 6-phase and designated as M4.

The VFD performs similar to a 12-pulse drive.

Notes for field wiring diagram ( page 17) 1 Optional Flow Switches; If field supplied pressure differential flow switches are used, they must be installed across the vessel and not the pump. They must provide isolated dry contacts at J27. Removing the factory jumpers will correctly put the field switches in series with the factory-mounted switches.

2 CW Reset & Demand Limit; External 4-20mA signals can be wired to J23 for leaving (chilled) water reset and to J26 for demand limit.

3 Tower Bypass Valve & Tower Fan VFD; 0-10VDC analog outputs to these devices.

4 Chiller Remote On/Off Control of unit can be accomplished by connecting a set of isolated dry contacts at J25.

5 Mode Switch; Switch used for ice mode currently not available on WME chillers.

6 Condenser & Evaporator GPM; Connections for 4-20 ma flow signal from field-supplied devices.

7 Alarm Relay; A customer furnished 24 to 240 Vac power for controller alarm relay may be connected at J18. Maximum rating of the alarm relay coil is 25 VA.

8 Evap Water Pump #1 & #2; A digital output for a optional customer supplied 25 VA maximum coil rated, chilled water pump relay. One or two may be wired as shown. This option will cycle the chilled water pump in response to chiller demand.

9 Cond Water Pump #1 & #2; The condenser water pump must cycle with the unit. A customer supplied 25 VA maximum coil rated, condenser water pump relay (one or two) must be wired as shown. Units used in a free-cooling application must have condenser water above 50°F before starting.

10 Tower Fan Staging #1, #2 & #3; Digital outputs for optional customer supplied 25 VA maximum coil rated cooling tower fan relays may be wired as shown. This option will cycle the cooling tower fans as prescribed by the tower control set points.

M7-42

OMM 1034-4 17

Figure 6, Field Wiring Diagram (see notes on page 16)

NOTE: The “J” terminals blocks are on the top of the back panel under the four knockouts for field wiring.

M7-43

OMM 1034-4 19

Operator Interface Touch Screen (OITS) Navigation The home screen shown in VIEW screen is usually left on (there is a screen-saver built in that is reactivated by touching the screen anywhere on the front surface). This VIEW screen contains the STOP and AUTO buttons used to start and stop the unit when in user control. Other groups of screens can be accessed from the Home screen by pressing one of the buttons on the bottom of the screen; TREND, VIEW, SET, ALARM.

TREND will graph the recent data for several system variables: evaporator water temperatures, condenser water temperatures, evaporator pressure, condenser pressure, % RLA, % RPM, % Vanes.

VIEW will go to the next View screen and other sub-View screens used to look in detail at settings and the operation of the chiller. Pressing View from any other screen will return to the previously selected View screen.

View screens are used for looking at unit status and conditions.

SET will go to a series of screens used to set or view setpoints.

ALARM will display recent and active alarms.

NOTE: The data shown on screens in this section do not necessarily reflect actual operating conditions.

Figure 7, Home View Screen

Home View Screen The Home View Screen shows the basic condition of the chiller.

Information State of compressor and pumps; a green light indicates on. black indicates off.

Active chilled water (LWT) setpoint Entering and leaving chilled and condenser water temperatures Percent motor amps (approximates percent load) UNIT STATUS consists of unit MODE, followed by STATE, followed by the SOURCE that is the device or signal that created the STATE. The possible messages are in the following table:

M7-44

20 OMM 1034-4

Table 11, UNIT STATUS Combinations

MODE STATE SOURCE

COOL OFF Manual Switch

SHUTDOWN ( See Note) Remote Switch AUTO User

BAS Network

Note: Shutdown is the chiller state when in the process of shutting down.

The Home View Screen-Detail gives additional information on the refrigerant pressures and temperatures, compressor speed and other system data. When first booted up, this screen will only show the left side. As soon as one of the details, such as STATE is selected, and from then on, the screen will show information appearing on the right side.

Figure 8, Home View Screen-Detail

Pressing the STATE button will bring up a display of the compressor state superimposed on the View Home Screen- Detail as shown in Figure 8.

Pressing the I/O button will bring up a display of the compressor inputs and output status (I/O) superimposed on the View Home Screen-Detail as shown in Figure 9. These I/Os are to and from the compressor controller.

Range extension position is the percent opening of the range extension valve. The value locks to zero if the feature is not configured.

M7-45

OMM 1034-4 21

Figure 9, Compressor I/O Screen

Digital Outputs: a green light to the left of a condition indicates it is active. Liquid injection is a user option controlled by a setpoint

Analog Inputs: data from sensors connected to the compressor

Analog Output: compressor speed output

Stepper Outputs: compressor stepper outputs for inlet guide position, rotor cooling, and range extension

Range Extension Position: range extension position is the percent opening of the range extension valve. The value locks to zero if the feature is not configured

M7-46

22 OMM 1034-4

Pressing the UNIT I/O button, located in the lower-left corner of the screen, displays the current unit inputs and outputs superimposed on the View Home Screen-Detail as shown in Figure 10. These I/Os are to and from the unit controller.

Figure 10, Unit Input/Output (I/O)

Digital Inputs: inputs to the unit controller that determine if the compressor can start.

Digital Outputs: outputs to start the evaporator and condenser pumps and tower fans or indicate an alarm condition such as no flow.

Analog Outputs: analog outputs to set the tower bypass valve and/or the tower fan VFD to the correct position or speed.

Analog Inputs: inputs usually from a BAS to control LWT reset and demand limiting for the compressor power input.

Range Extension Position: range extension position is the percent opening of the range extension valve. The value locks to zero if the feature is not configured.

Pressing the EVAP or COND button, located on the vessels, will give detailed information on the evaporator or condenser pressures and temperatures as shown on the following page.

M7-47

OMM 1034-4 23

Figure 11, Evaporator Screen

Figure 12, Condenser Screen

M7-48

24 OMM 1034-4

Pressing the Power button, located on the left side of the screen, will access the screen giving power data. Individual line current and voltage values, power factor and kW Hours are only available with the optional Input Power Meter.

Figure 13, Power Screen

M7-49

OMM 1034-4 25

SET Screens The set screens on the Interface Panel are used to input the many setpoints associated with equipment of this type.

MicroTech-E provides an extremely simple method for accomplishing this. Appropriate setpoints are factory set and checked by Service or a Factory Authorized Service Company during commissioning. However, adjustments and changes are often required to meet job conditions. Certain settings involving pumps and tower operation are always field set.

Pressing the SET button from any other screen accesses the SET screen. Pressing the SET button while on a SET screen will access the SERVICE screen.

The various setpoint groups are in a column on the right side of the screen. Each button contains a number of setpoints grouped together by similar content. For example, The WATER contains various setpoints relating to water temperatures.

NOTE: Some setpoints that do not apply to a particular application may still be listed on the screen. They will be inactive and can be ignored.

The numbered buttons in the second from right column are pressed to select a particular setpoint. The selected setpoint will appear in green on the screen and a description of it (with the range of available settings) will appear in the upper left-hand box.

Figure 14, Typical Setpoint Screen Setpoint Groups

Setpoint Access

Numbers

Current Setpoint

Values

Buttons to Access Other MenusKeypad

Current Unit & Compressor Status

Setpoint Description and Range of Values

M7-50

26 OMM 1034-4

Procedure for Changing a Setpoint A list of setpoints, their default value, their available setting range, and password authority are shown on the page relating to the particular setpoint screen beginning on page 27.

Press the applicable Setpoint Group Button. A complete explanation of setpoint content of each group follows this section.

1) Select the desired setpoint by pressing the numbered button.

2) Press the CHANGE button indicating that you wish to change a setpoint value. A keypad dialog box will be turned on automatically for entering the password.

3) O= Operator password : default = 100

4) T = Technician level password is reserved for authorized technicians

5) Press the appropriate numbers in the keypad box to enter the password. There is a small delay between pressing the keypad and recording the entry. Be sure that an asterisk appears in the window before pressing the next number. Press ENTER to return to the SETPOINT screen. The password will remain open for 15 minute after initiation and does not need to be re-entered during this period.

6) Press CHANGE again

7) The numeric keypad and action buttons in the lower left-hand corner of the screen will be activated. Setpoints with numeric values can be changed in two ways:

Select the desired value by pressing the numbered buttons. Press ENTER to enter the value or CANCEL to cancel the transaction.

Press the UP or DOWN button to increase or decrease the value displayed. Press ENTER to enter the value or CANCEL to cancel the transaction.

Some setpoints are text rather than numeric values. For example, LWT Reset Type can be "None" or "4-20 ma". The selection can be made by toggling between choices using the UP or Down button. If dashed lines appear in the setpoint window, it indicates that you have toggled too far and need to reverse direction. Press ENTER to enter the choice or CANCEL to cancel the transaction.

Setpoints requiring text entry open an alphanumeric keyboard.

Once CHANGE is selected, the CANCEL or ENTER buttons must be pressed before another setpoint can be selected.

Additional setpoints can be changed by selecting another setpoint on the screen or by selecting an entirely new group of setpoints.

Range Extension The range extension function is only accessible with the technician password. Consult Service.

Explanation of Setpoints Each of the setpoint groups of screens are detailed in the following section. The groups are:

WATER, UNIT, STAGING, POWER, TOWER, VALVE, ALARMS, BAS

In some cases, pressing the button again may display a second page of setpoints in the same group.

Pressing SET from any SET screen accesses the SERVICE screen. In other words, it is the second "SET" screen. While containing information and activity buttons for the service technician, it also has valuable information for the operator.

The software version numbers shown in the lower left corner are the controllers' software identification. These numbers may be required by to answer questions about unit operation or to assist in possible future upgrades of software.

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Setpoint Screens Figure 15, BAS Setpoint Screen #1

Figure 16, BAS Setpoint Screen #2

Screen details on the following page.

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Table 12, BAS Screen #1 Setpoints

Description No . Default Range Password Comments

BACnet IP - Foreign Device

Time 15 0 (0) to 65535 Seconds O

The Time-to-Live, in seconds, within which the Chiller (a Foreign Device) must re-register with the BBMD.

BACnet IP -

BBMP IP

Address

14 0.0.0.0 = "None

(XXX.XXX.XXX.XXX)

where each XXX can be

0 to 255 O

The Internet Protocol (IP) address for the BACnet Broadcast Management Device (BBMD) to which the chiller is registered.

BACnet IP - Default Gateway 13 None

(XXX.XXX.XXX.XXX)

where each XXX can be

0 to 255 O The Internet Protocol (IP) address of the BACnet IP router.

BACnet IP UDP Port 12

47808 decimal

(BAC0

hexadeci mal).

0 to 65535 decimal O The User Datagram Protocol (UDP) port number to use on the IP network.

BAC net IP Subnet Mask 11 255.255.2

55.0

(XXX.XXX.XXX.XXX)

where each XXX can bo

0 to 255 O Subnet Mask for the communication module.

BACnet IP - Network Addr 10 172.15.5.8

(XXX.XXX.XXX.XXX)

where each XXX can bo

0 to 255 O The four-octet (32-bit) Internet Protocol (IP) address for the communications module.

BACnet (all) - UTC Offset 9 0 -780 to +780 minutes O

Sets the local time zone by Specifying the zone's offset from Universal Time Coordinated (UTC) in minutes.Example: US Central Standard Time (CST) is -360.)

BACnet (all) - Daylight Savings

Time 8 None

NO: Do not use Daylight Savings Time.

YES: Use Daylight Savings Time.

O ---

BACnet (all) - APDU Retries 7 3 0 to 10 O

The maximum number of times an Application Protocol Data Unit (APDU) transmission shall be sent when there is no acknowledgment.

BACnet (all) - APDU Tiimeout 6 3000 milli-seconds 0 to 60,000 milliseconds O The retry timeout interval (msec) for Application Protocol Data Unit (APDU) transmissions that require acknowledgment.

BACnet (all) - Description 5 None 31characters maximum. O The desired BACnet description of this particular chiller BACnet (all) - Object Name 4 31 characters maximum. O The unique BACnet Object Name

BACnet (all) - Device Instance 3 3000 0 to 4194302 O The unique BACnet Device

Instance number.

BACnet (all) - English / Metric 2 English

ENGLISH: Use English units. (Deg F, PSI, GPM)

METRIC: Use Metric units. (Deg C, kPa, liter/sec)

O ---

BAS Network Protocol 1 None

BAS Network Protocol NONE: No BAS network

MODBUS: RTU - RS485

LON: LONtalk - FTT-10A BACnet IP: IP - Ethernet

BACnet Ethernet:

Ethernet

BACnet MS/TP: RS485

O ---

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Table 13, BAS Screen #2 Setpoints Description No. Default Range Password Comments

MODBUS - Baud Rate 8 9600 1200, 2400, 4800, 9600, 19200 O Sets the communications baud rate to use on the RS485 network.

MODBUS -

Network Address 7 1 1 to 247 O Sets the address to use on the

RS485 network.

MODBUS

Eng/Metric 6 English English or Metric O ENGLISH: Use English units. (Deg F, PSI, GPM)

METRIC: Use Metric units. (Deg C, kPa, liter/sec) BACnet MS/TP -

Baud Rate 5 38400 9600, 19200, 38400, 76800 O Sets the communications baudrate to use on the

RS485 network.

BACnet MS/TP Max Info Frames 4 5 1 to(5 O

Maximum number of Information Frames that can be sent before the communication module must pass the token.

BACnet MS/TP -

Max Masters 3 127 1 to 127 O Maximum number of master controllers currently on the network.

BACnet MS/TP - MAC Address 2 1 0 to 127 O Unique MAC Address of the communication module.

BACnet Ethernet - MAC Address 1

XX-XX-XX-XX-XX-XX

Each XX can be 00 through

FF hexadecimal O Unique MAC Address of the communication module.

Figure 17, Alarms Screen

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Table 14, ALARM Setpoints

Description No. Default Range Pass-word Comments

Condenser Freeze Protect 11 34.0 F -9.0 to 45.0 F O

Sets the value of condenser saturated temperature below which the condenser pump is forced ON.

Evaporator Freeze Protect 10 34.0 F -9.0 to 45.0 F O

Sets the value of evaporator saturated temperature below which the evaporator pump is forced ON.

Motor Current Threshold 9 5% 3% to 99% T When %RLA is below this SP, motor is considered OFF. When above, motor is considered ON.

Surge Slope Limit 8 20 1 – 99 deg F/min. T

Sets the Surge Temp (ST) slope value above which alarm occurs.

Active only if ST > SP7 at start.

Deactivated when ST drops below SP7.

Surge Temperature Limit 7 6 2 – 25 deg F T

At start,Surge Temp(ST) is compared to this SP.(ST=Sctn Temp-Evap LWT) if Less:Alarm occurs when ST>2X this SP.

if Greater:Slope alarm is active until ST<this SP.

Then alarm at 2X this SP.

High Discharge Temp- Stop 6 190 F 120 to 240 F T Sets the discharge temperature above which the compressor is shut down.

High Discharge Temp- Load 5 190 F 120 to 240 F T

Sets the discharge temperature above which a forced capacity increase occurs.

High Condenser Pressure 4 140 psi 120 to 240 psi T Sets the condenser pressure above which the compressor is shut down.

Low Evap Pressure, Stop 3 26 psi 10 to 45 psi O Sets the evaporator pressure value below which the compressor is shut down.

Low Evap Pressure- Unload 2 31 psi 20 to 45 psi O Sets the evaporator pressure value below which a forced capacity decrease occurs.

Low Evap Pressure- Inhibit 1 35 psi 20 to 45 psi O

Sets the evaporator pressure value below which any capacity increase is inhibited.

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Figure 18, Tower Bypass VALVE Setpoint Screen

Table 15, Tower Bypass VALVE Setpoints (See page 33 for complete explanation.)

Description No. Default Range Pass-word Comments

Valve Control Slope Gain 15 25 10 to 99 O Control gain for temperature (or lift) slope Valve Control Error Gain 14 25 10 to 99 O Control gain for temperature (or lift) error Valve Control Range(Max) 13 90% 0 to 100% O Maximum valve position, overrides all other settings Valve Control Range (Min) 12 10% 0 to 100% O Minimum valve position, overrides all other settings

Temp–Max. Start Position 11 90 F 0 to 100 F O Condenser EWT at which initial valve position is set to setpoint #10

Maximum Start Position 10 100% 0 to 100% O Initial valve position when condenser EWT is at or above Setpoint # 11

Temp – Min. Start Position 9 60 F 0 to 100 F O Condenser EWT at which initial valve position is set to Setpoint #

Minimum Start Position 8 0% 0 to 100% O Minimum position of valve when condenser EWT is at or below Setpoint # 9

Stage Down @ 7 20% 0 to 100% O

Valve position below which the fans can stage down (Tower Setpoint #2 = Valve Stage VFD speed below which the fans can stage down (Tower Setpoint # 2 = /VFD stage or valve SP/VFD stage

Stage Up @ 6 80% 0 to 100% O

Valve position above which the fans can stage up (Tower Setpoint #2 = Valve Stage VFD speed above which the fans can stage up (Tower Setpoint # 2 = VFD or valve SP/VFD stage

Valve Deadband (Lift) 5 4.0 psi 1.0 to 20.0 psi O Sets control deadband, Tower Setpoint #1=Lift Valve Deadband (Temp) 4 2.0 F 1.0 to 10.0 F O Sets control deadband, Tower Setpoint #1=Temp

Valve Target (Lift) 3 30 psi 10 to 130 psi O Target for lift pressure (Tower Setpoint #1= Lift), Works with Setpoint # 5

Valve Target (Temp) 2 65 F 40 to 120 F O Target for condenser EWT (Tower Setpoint #1= Temp), Works with Setpoint # 4

Tower Valve Type 1 NC (To Tower) NC, NO O Normally closed or normally open to tower

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Figure 19, Cooling Tower Setpoint Screen (See page 33 for complete explanation.)

Table 16, Tower Fan Settings

Description No. Default Range Pass-word Comments

Stage #3 On (Lift) 13 55 psi 10 to 130 psi O Lift pressure for fan stage #3 on Stage #2 On (Lift) 12 45 psi 10 to 130 psi O Lift pressure for fan stage #2 on Stage #1 On (Lift) 11 35 psi 10 to 130 psi O Lift pressure for fan stage #1 on Stage #3 On (Temp) 10 80 F 40 to 120 F O Temperature for fan stage #3 on Stage #2 On (Temp) 9 75 F 40 to 120 F O Temperature for fan stage #2 on Stage #1 On (Temp) 8 70 F 40 to 120 F O Temperature for fan stage #1 on Stage Differential (Lift) 7 6.0 psi 1.0 to 20.0 psi O Fan staging deadband with Setpoint # 1=Lift Stage Differential (Temp) 6 3.0 F 1.0 to 10.0 F O Fan staging deadband with Setpoint #1=Temp

Fan Stage Down Time 5 5 min 1 to 60 min O Time delay between stage up/down event and next stage down

Fan Stage Up Time 4 2 min 1 to 60 min O Time delay between stage up/down event and next stage up

Cooling Tower Stages 3 2 1 to 3 O Number of fan stages used

Twr Valve/Fan VFD Control 2 None

None, Valve Setpoint, Valve Stage, VFD Stage, Valve SP/VFD Stage

O

None: No tower valve or VFD Valve Setpoint: Valve controls to VALVE SP3(4) & 5(6) Valve Stage: Valve controls between fan stages VFD Stage: 1st fan is VFD controlled, no valve Valve Setpoint/VFD Stage: Both valve and VFD

Tower Control 1 None None, Temperature, Lift

O None: No tower fan control Temperature: Fan and valve controlled by condenser EWT Lift: Fan and valve controlled by lift pressure

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OMM 1034-4 33

Explanation of Tower Control Settings The MicroTech control can control cooling tower fan stages, a tower bypass valve, and/or a tower fan VFD if the chiller has a dedicated cooling tower.

The Tower Bypass Valve position will always control the Tower Fan Staging if Valve Setpoint, Stage Setpoint is selected. Fan staging is determined by Min & Max Tower Valve Position.

There are five possible tower control strategies as noted below and explained in detail later in this section. They are selected from SETPOINT TOWER SP2.

1. NONE, Tower fan staging only. In this mode the tower fan staging (up to 3 stages) is controlled by either the condenser Entering Water Temperature (EWT) or LIFT pressure (difference between the condenser and evaporator pressures). Tower bypass or fan speed are not controlled.

2. VALVE SP, Tower staging with low-limit controlled bypass valve. In this mode the tower fans are controlled as in #1 plus a tower bypass valve is controlled to provide a minimum condenser EWT. There is no interconnection between the fan control and the valve control.

3. VALVE STAGE, Tower staging with stage controlled bypass valve. In this mode the bypass valve controls between fan stages to smooth the control and reduce fan cycling

4. VFD STAGE. In this mode a VFD controls the first fan. Up to 2 more fans are staged on and off and there is no bypass valve.

5. VALVE/VFD, Tower fan control with VFD plus bypass valve control.

Tower Fan Staging Only (NONE) The following settings are used for the Tower Fan Staging Only mode, (SP= setpoint)

1) TOWER SETPOINT Screen

2) See Figure 6, Field Wiring Diagram on page 17 for fan staging field wiring connection points.

a) SP1. Select TEMP if control is based on condenser EWT or LIFT if based on compressor lift expressed as a pressure difference.

b) SP2. Select NONE for no bypass valve or fan VFD control.

c) SP3. Select one to three fan outputs depending on the number of fan stages to be used. More than one fan can be used per stage through the use of relays.

d) SP4. Select STAGE UP TIME from 1 to 60 minutes. The default value is probably a good starting point. The value may need to be adjusted later depending on actual system operation.

e) SP5. Select STAGE DOWN TIME from 1 to 60 minutes. The default value is probably a good starting point.

The value may need to be adjusted later depending on actual system operation.

3) If TEMP is selected in SP1, use

a) SP6. Select STAGE DIFFERENTIAL in degrees F (degrees C), start with default of 3 degrees F.

b) SP8-11. Set the STAGE ON temperatures consistent with the temperature range over which the condenser EWT is desired to operate. The default values of 70 F, 75 F and 80 F are a good place to start in climates with moderate wet bulb temperatures. The number of STAGE ON setpoints used must be the same as SP3.

4) If LIFT is selected in SP1, use

a) SP7. Select STAGE DIFFERENTIAL in PSI (kPa). Start with default of 6 PSI.

b) SP11-13. Start with default setpoints. The number of STAGE ON setpoints used must be the same as SP3.

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34 OMM 1034-4

Tower Fan Staging With Bypass Valve Controlling Minimum EWT (VALVE SP)

1) TOWER SETPOINT Screen

a) SP1. Select TEMP if control is based on condenser EWT or LIFT if based on compressor lift expressed as a pressure difference.

b) SP2. Select Valve SP for control of bypass valve based on temperature or lift.

c) SP3. Select one to three fan outputs depending on the number of fan stages to be used. More than one fan can be used per stage through the use of relays.

d) SP4. Select STAGE UP TIME from 1 to 60 minutes. The default value of 2 minutes is probably a good starting point. The value may need to be adjusted later depending on actual system operation.

e) SP5. Select STAGE DOWN TIME from 1 to 60 minutes. The default value of 5 minutes is probably a good starting point. The value may need to be adjusted later depending on actual system operation.

f) If TEMP is selected in SP1, use:

i) SP6. Select STAGE DIFFERENTIAL in degrees F (C), start with default of 3 degrees F.

ii) SP8-11. Set the STAGE ON temperatures consistent with the temperature range over which the condenser

EWT is desired to operate. The default values of 70 F, 75 F, and 80 F are a good place to start in climates with moderate wet bulb temperatures. The number of STAGE ON setpoints used must be the same as SP3.

g) If LIFT is selected in SP1, use

i) SP7. Select STAGE DIFFERENTIAL in PSI (kPa). Start with default of 6 PSI.

ii) SP12-15. Start with default setpoints. The number of STAGE ON setpoints used must be the same as SP3.

2) VALVE SETPOINT Screen

a) SP1, Select NC or NO depending if valve is closed to tower with no control power or open to tower with no control power.

b) If TEMP was selected for fan control above, use:

i) SP2, Set the VALVE TARGET (setpoint), usually 5 degrees F below the minimum fan stage setpoint established in TOWER SP8. This keeps full flow through the tower until the last fan is staged off.

ii) SP4, Set VALVE DEADBAND, the default of 2 degrees F is a good place to start.

iii) SP8, Set MINIMUM START POSITION when EWT is at or below SP9. Default is 0%.

iv) SP9, Set the EWT at which the valve position will be at (SP8). Default is 60 F.

v) SP10, Set the initial valve position when EWT is at or above SP11. Default is 100%.

vi) SP11, Set the EWT at which initial valve position is set to SP8. Default is 90 F.

vii) SP12, Set the minimum position to which the valve can go. Default is 10%.

viii) SP13, Set the maximum position to which the valve can go. Default is 90%.

ix) SP14, Set the control gain for error. Default is 25.

x) SP15, Set the control gain for slope. Default is 25.

NOTE: Setpoints 14 and 15 are site specific dealing with system fluid mass, component size and other factors affecting the reaction of the system to control inputs. These setpoints should be set by personnel experienced with setting up this type of control.

3) If LIFT was selected for fan control, use

a) SP3, Set the VALVE TARGET (setpoint), usually 30 psi below the minimum fan stage setpoint established in

TOWER SP11. This keeps full flow through the tower until the last fan is staged off.

b) SP5, Set VALVE DEADBAND, the default of 6 psi is a good place to start.

c) SP8, Set MINIMUM START POSITION when EWT is at or below SP9. Default is 0%.

d) SP9, Set the EWT at which the valve position will be at (SP8). Default is 60 F.

e) SP10, Set the initial valve position when EWT is at or above SP11. Default 100%.

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f) SP11, Set the EWT at which initial valve position is set to SP8. Default is 90 F.

g) SP12, Set the minimum position to which the valve can go. Default is 10%.

h) SP13, Set the maximum position to which the valve can go. Default is 100%.

i) SP14, Set the control gain for error. Default is 25.

j) SP15, Set the control gain for slope. Default is 25.

NOTE: Setpoints 14 and 15 are site-specific dealing with system fluid mass, component size and other factors affecting the reaction of the system to control inputs. These setpoints should be set by personnel experienced with setting up this type of control.

See Figure 6 on page 17 for fan staging and bypass valve field wiring connection points.

Tower Staging with Bypass Valve Controlled by Fan Stage (VALVE STAGE) This mode is similar to #2 above except that the bypass valve setpoint changes to be set at the same point of whatever fan stage is active rather than just maintaining a single minimum condenser EWT. In this mode the valve controls between fan stages and tries to maintain the fan stage setting in effect. When it is max open or max closed (staging up or down) and the temperature (or lift) moves to the next fan stage, the valve will go the opposite extreme setting. This mode reduces fan cycling.

This mode is programmed the same as Mode #2 above except that in SETPOINT, TOWER, SP2, VALVE STAGE is selected instead of VALVE SP.

Fan VFD, No Bypass Valve (VFD STAGE) The fan VFD mode assumes the tower is driven by one large fan.