Attachment_5_142010-26-0151.pdf

MC4001-BC6 SERIES SOLID STATE

DUAL UNIT LEAD/LAG CONTROLLER

WITH CB5000 COMMUNICATION BOARD

Bard Manufacturing Company, Inc.

Bryan, Ohio 43506 www.bardhvac.com

INSTALLATION INSTRUCTIONS

& REPLACEMENT PARTS LIST

CONTENTS

Figures

— — — CB5000 Communication Board

Figure 1 Controller Connections 1-Stage (WA/WL, W**A/W**L Series) A/C – No Economizers... 20

Figure 2 Controller Connections 2-Stage (WA*S/WL*S Series) A/C – No Economizers

Figure 3 Controller Connections 1-Stage (WA/WL, W**A/W**L Series) A/C – No Econo with Alarm Board & CB5000 Comm. Board

Figure 4 Controller Connections 2-Stage (WA*S/WL*S Series) A/C – No Econo with Alarm Board & CB5000 Comm. Board

Figure 5 Controller Connections 1-Stage (WA/WL, W**A/W**L Series) A/C-Older EIFM Econo... 24

Figure 6 Controller Connections 2-Stage (WA*S/WL*S Series) A/C-Older Style EIFM Econo

Figure 7 Controller Connections 1-Stage (WA/WL, W**A/W**L Series) A/C w/Older Style EIFM Econo, Alarm Board & CB5000 Comm. Board

Figure 8 Controller Connections 2-Stage (WA*S/WL*S Series) A/C w/Older Style EIFM Econo, Alarm Board & CB5000 Comm. Board

Figure 9 Controller Connections 1-Stage (WA/WL, W**A/W**L Series) A/C w/ECONWMT Econo

Getting Other Information and Publications

Shipping Damage

General

Theory of Operation

Controller Certifications

Specifications/Features for Basic Controller

Mounting the Controller

Temperature Sensors

Temperature Sensor Logic

Using Multiple Sensors

Basic MC4001 Controller Input/Output Specifications

Specifications/Features for Alarm Boards

Low Voltage Field Wiring

Controller Wiring

Controller Grounding

Controller Power-Up

Fire Suppression Circuit

Staging Delay Periods

Blower Operation

Advance (Swap) Lead/Lag Unit Feature

Accelerate Timer Feature

General Programming Overview

Humidity Control Option

Cooling Operating Sequences for Alternating Lead/Lag/Lead/Lag Configuration

Cooling Operating Sequences for Non-Alternating Lead/Lead/Lag/Lag Configuration

Heating Sequence of Operation

Specifications for Optional Remote Communication Board

Security (Locking) Feature

Generator Run Feature

Backup DC Power Connection

Alarm Wiring

2nd Stage Cooling Alarm

Refrigerant Pressure Alarms

Emergency Ventilation Sequence

Programming Instructions

Figure 10 Controller Connections 2-Stage (WA*S/.WL*S Series) A/C w/ECONWMT Econo

Figure 11 Controller Connections 1-Stage (WA/WL, W**A/W**L Series) A/C w/ECONWMT Econo, Alarm Board & CB5000 Comm. Board

Figure 12 Controller Connections 2-Stage (WA*S/WL*S Series) A/C w/ECONWMT Econo, Alarm Board & CB5000 Comm. Board

— — — Alarm LED Display Board

Figure 15 Alarm Board Connections for Normally Closed "NC" Open-On-Alarm Strategy

Figure 16 Alarm Board Connections for Normally Open "NO" Close-On-Alarm Strategy

Figure 17 MC4001 Parts Diagram

— — — MC Series Label

Tables

— — — Controller Programmable Features and

Default Settings

Table 1 Connection Diagram Selection

Parts List

Getting Other Information and Publications

These publications can be used to help install the air conditioner or heat pump. They usually be found at a local library or purchase them directly from the publisher. Be sure to consult the most current edition of each standard.

Standard for the Installation.........ANSI/NFPA 90A of Air Conditioning and Ventilating Systems

Standard for Warm Air Heating......ANSI/NFPA 90B and Air Conditioning Systems

For more information, contact these publishers:

CONFORMS TO UL STD 916

CERTIFIED TO

CSA STD C22.2 NO. 205

MC4001 Series Master Controller

This device complies with FCC Rule Part 15, Subpart B, Class A. Operation is subject to the following two conditions:

1. This device may not cause harmful interference

2. This device must accept any interference received, including that which may cause undesired operation.

This device complies with CE Standards EN55011/ EN50081 and EN55024 for ISM Equipment, Class A.

This ISM device also complies with Canadian ICES

– 001.

Bard Manufacturing Company, Inc.

Bryan, OH 43506

SHIPPING DAMAGE

Upon receipt of equipment, the carton should be checked for external signs of shipping damage. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent.

GENERAL

These instructions explain the operation, installation and troubleshooting of the MC4001 controller.

All internal wiring is complete. Only attach low voltage field wiring to designated terminal strips.

The MC4001 is for use with units with or without economizers, can be configured for use with heat pumps and has a dehumidification control feature if an optional humidity controller is connected.

Dehumidification control cannot be used with heat pump.

Each unit should be sized to handle the total load of the structure if 100% redundancy is required.

It is recommended that a 5 minute compressor time delay relay be installed in each unit if not so equipped.

The MC4001 controller is suitable for both 50 and 60 HZ operation, and is fully configurable such that it can be used in virtually any installation (see controller programmable features and default settings on page 38).

THEORY OF OPERATION

The controller is used to control two wall mount air conditioners from one control system. It provides total redundancy for the structure and equal wear on both units. It can be used with units with or without economizers and it is recommended that both units be equipped alike.

The MC4001 controller can be configured for alternating (lead/lag/lead/lag) sequence, which is default setting. It can be changed to non-alternating (lead/lead/lag/lag) sequence as required for special applications or user preference.

The MC4001 can be equipped with one of two alarm boards, and these can be factory- nstalled or installed at any time in the field if so desired.

Should the base controller alone be initially installed, it is easily upgradeable by simple snap-in, plug-in field installation of either one of the alarm boards, requiring only the connection of the building alarm circuitry to the alarm boards. Form C dry contact alarm relays are used, offering both NO and NC switching to meet the user’s specific alarm protocol, providing complete flexibility to meet any user's requirements. All alarm actuations are individually indicated on the controller front panel.

There is an Ethernet-based remote communication option that can be either factory or field installed.

See Specifications for Optional Remote Communication Board on page 15.

CONTROLLER CERTIFICATIONS

The MC4001 main controller board, optional alarm boards, optional communication module and remote sensors have undergone extensive testing for immunity and emissions. This system is FCC-compliant, in accordance with CE requirements, and meets the following standards:

IMPORTANT

The equipment covered in this manual is to be installed by trained, experienced service and installation technicians. Please read entire manual before proceeding.

SPECIFICATIONS/FEATURES FOR

BASIC CONTROLLER

MC4001 Basic Controller

• Input power: 18-32 VAC, 60/50Hz, power is supplied from A/C #1 and/or A/C #2

• Isolation circuitry: No line or low voltage phasing required

• Backup power: Connection for -24 VDC or -48 VDC (-20 to -56V) maintains microprocessor operation, front panel indication and alarm relay operation during commercial power outages.

• Digital display: 4-character LCD

• Temperature display: F or C

• HVAC outputs: Form A (NO) relays (1A @ 24 VAC)

• Cooling control stages:

Two for each A/C unit (four total) when configured for economizers

One for each A/C unit (two total) when configured for no economizers

• Heating control stages:

One for each A/C unit, two for each heat pump if so configured

• Dehumidification circuit: Requires optional humidity controller as input signal

• Lead/lag changeover time: 0 to 30 days

• Timing accuracy: +/- 1%

• Inter-stage time delay: 10 seconds between stages

• On-off differential: 2°F (1°C) is standard, 4°F (3°C) when “excessive cycling” mode is enabled

• Cooling setpoint range: 65° to 90°F (18.3° to 32.2°C)

• Comfort setting-Cooling 72°F (22°C), Heating 68°F(20°C), for 1 hour

• Dead-band (difference between cooling and heating setpoints): 2°F to 40°F (1.1°C to 22.2°C)

• Fire/smoke interface: standard NC circuit jumper, remove for connection to building system control, shuts down outputs to both A/C units immediately

• Memory: EEPROM for set point and changeable parameters (maintains settings on power loss)

• Space temperature sensors: One local is standard, will accept up to two optional 35' remote sensors, Bard part number 8612-023A. When multiple sensors are used, temperatures are averaged.

• Controller enclosure: 20-gauge pre-painted steel, 9.25"W x 13.50"H x 3.00"D, hinged cover, thirteen

(13) .875" diameter electrical knockouts

• LEDs for basic controller: Lead unit, Cooling stages 1 through 4, Heating Stages 1 – 4, Dehumidification operation

• Six (6) Push-button controls: On/Off switch-Change lead unit-Increase and Decrease setpoints-Program/ Save-Comfort.

MOUNTING THE CONTROLLER

Included in the controller carton is the controller and installation instructions.

The controller should be installed on a vertical wall approximately 4' above the floor away from drafts and outside doors or windows. Four (4) mounting holes are provided for mounting to the wall and 7/8" holes for conduit connections are provided in both the base, sides and top of the controller.

TEMPERATURE SENSORS

The standard (local) temperature sensor has 12" leads and comes installed from the factory.

A secondary sensor is located internally on the main controller board and serves as a reference and back-up sensor to the local sensor. If the difference between the two sensors is less than the differential setpoint, the local sensor will be used as the controller's temperature point of reference. The differential is adjustable from 12-20°F. 12°F is the default setting.

If the difference between the two sensors is greater than the differential setpoint, the controller will check to determine if the onboard sensor is reading a temperature that is between the SP (setpoint), plus the differential and the SP minus the DB (dead-band) minus the differential. If it is, the onboard sensor will become the valid sensor reading and the controller will ignore the local sensor reading. If not, the controller will still use the local sensor reading. This is to add additional levels of operational capability in the rare event the local sensor fails. If the controller is operating in this mode, it is indicated by the lower left decimal point flashing in the display. If this feature is not desired, set the differential setpoint to OFF. This disables the onboard sensor. This may be necessary if the controller is located in one room and the local sensor has been relocated to a different room. NOTE:

For purposes of testing when the local sensor is manually driven higher or lower by applying warm or cool water to the probe the onboard sensor is inhibited for the first 30 minutes following power up, or when power is cycled off and back on.

The controller is designed to accept one or two additional sensors and those have 35-foot leads. The Bard part number for the optional sensor with 35-foot leads is 8612-023A. These can be installed as required in the structure to address hot spots, barriers to airflow, etc. If a remote sensor(s) is used, the onboard sensor is disabled. The local sensor remains active.

It is recommended that the sensor lead wires be installed in conduit for protective purposes.

TEMPERATURE SENSOR LOGIC

The standard local (LSEn) sensor monitors the temperature at the controller location. If this is the only sensor connected, it will control the temperature readout, the space (building) temperature and also be used for Low and High Temperature alarm functions.

If one or more REMOTE sensors are installed and connected (Rem 1 or Rem 2), the temperature readout will display and the building will be controlled to an average of all connected sensors. If there is more than 10°F difference from the highest to the lowest connected sensor, the actual control will be governed by the hottest sensor for cooling and the coldest sensor for heating.

If alarm boards are utilized, the highest reading of any connected sensor will be used for high temperature alarm and the lowest reading sensor will be used for low temperature alarm. The onboard sensor is ignored if two or more sensors are connected to the Local, Rem 1 or Rem 2 sensor inputs.

BASIC MC4001 CONTROLLER

INPUT/OUTPUT SPECIFICATIONS

MC4001 CONTROLLER CONNECTIONS

(Located on Main Controller Board)

NOTE: All alarm and output relays are dry contacts rated 1A @ 24 VAC.

NOTE: All alarm relay outputs have 10-second delay before issuing to protect against nuisance alarm signals.

* These connections require either jumper or normally closed (NC) relay contact at the fire/smoke and generator interface for controller to function.

Alarm relays can be wired for NO (close on alarm) or NC (open on alarm) strategy. Alarm relays can be used individually if there are enough available building alarm points, or can be arranged into smaller groups or even a single group so that all alarm capabilities can be utilized. When multiple alarms are grouped together and issued as a single alarm there will be no off-site indication of which specific problem may have occurred, only that one of the alarms in the group has

NOTE: All sensors are polarity sensitive. The copper lead must connect to terminal CU, and the silver lead to AG. Sensors are solid state, not RTD. Use only sensors supplied by Bard. Sensor leads can be extended up to 200' Use 18-gauge twisted pair with soldered connections.

NOTE:

Sensors are solid state, not RTD.

Use Bard sensors only.

LOW VOLTAGE FIELD WIRING

The MC4001 is powered from the air conditioners that it is controlling, 24 VAC (18-32V) low voltage only.

Circuitry in the MC4001 isolates the power supplies of the two air conditioners so that no back feeds or phasing problems can occur. Additionally, if one air conditioner loses power, the MC4001 and the other air conditioner are unaffected and will continue to operate normally.

Connect the low voltage field wiring from each unit per the low voltage field wiring diagrams (see

CONTROLLER WIRING).

NOTE: Maximum of 18-gauge control wiring should be used. Using heavier gauge wiring can create excessive stress on the control board as door is opened and closed. Create a wiring loop so the door can open and close without stressing terminal blocks.

CONTROLLER WIRING

The MC4001 can be used for controlling two air conditioners with or without economizers. It can also be configured for two heat pumps without economizers.

Units with economizers will connect differently than units without economizers; therefore, it is important to use the correct connection diagram.

There are older style EIFM economizers and newer style ECONWMT economizers that the MC4001 controller system can work with, and also an option for a remote Ethernet communication board. Therefore, it is important to select the correct low voltage connection diagram. See Table 1: Connection Diagram Selection on Page 20.

CONTROLLER GROUNDING

A reliable earth ground must be connected in addition to any grounding from conduit. Grounding lugs are supplied for this purpose.

CONTROLLER POWER-UP

Whenever power is first applied to the controller, there is a 20 second time delay prior to any function (other than display) becoming active. This time delay is in effect if the controller On/Off button is used when 24VAC from air conditioners is present, and also if controller is in “ON” position and 24VAC from air conditioners is removed and then restored.

FIRE SUPPRESSION CIRCUIT

To disable the MC4001 and shut down both air conditioners, terminals F1 and F2 may be used. The F1 and F2 terminals must be jumpered together for normal operation. A normally closed (NC) set of dry contacts may be connected across the terminals and been triggered. The individual alarm problem will be displayed on the LED display on face of the controller.

SPECIFICATIONS/FEATURES FOR

ALARM BOARDS

MC4001-A w/Optional Base Alarm Board (Inputs/Outputs)

NOTE: If this alarm board was not originally factory installed, it can be field installed at anytime. Bard part number is AB3000-A.

Inputs

Outputs

MC4001-B w/Enhanced Version Alarm Board (Additional Outputs) plus MC4001-A Inputs/Outputs

NOTE: If this alarm board was not originally factory installed, it can be field installed at anytime. Bard part number is AB3000-B.

Econ 1 E, F - Form A (NO)2

Econ 2 E, F - Form A (NO)2

2nd Stage Form C (SPDT)3

2nd-stage cooling alarm

1 Alarm will only activate if main board processor fails or if the alarm board to main board cable is damaged.

2 Make these connections to terminals E and F in HVAC 1 and 2 respectively if desired to have economizers open for emergency ventilation at High Temp Alarm #2 setpoint condition.

3 For units with 2-stage compressors, 2nd stage cooling alarm activates on cooling Stage 3 initiation.

the factory jumper removed for use with a field-installed fire suppression system. The contacts must open if a fire is detected. See the appropriate connection diagram on pages 20-33 for this connection. Contacts should be rated for pilot duty operation at 2 amp 24VAC minimum. Shielded wire (22-gauge minimum) must be used, and the shield must be grounded to the controller enclosure.

IMPORTANT NOTE: Older Bard R-22 models employ an electronic blower control that has a 60-second blower off delay. Current production R-410A models do not use a blower off delay device and the remainder of this note does not apply to those models. In order to have immediate shutdown of the blower motor, in addition to disabling the run function of the air conditioners, it will also require a simple wiring modification at the blower control located in the electrical control panel of the air conditioners being controlled by the lead/lag controller.

To eliminate the 60-second blower off delay, disconnect and isolate the wire that is factory-connected to the “R” terminal on the electronic blower control, and then connect a jumper from the “G” terminal on the blower control to the “R” terminal on the blower control. The electronic blower control will now function as an on-off relay with no off delay, and the blower motor will stop running immediately when the F1-F2 fire suppression circuit is activated (opened).

STAGING DELAY PERIODS

The following delays are built in for both cooling and heating:

Stage 1 0 seconds for blower (if not already on as continuous) 10 seconds for cooling or heating output

Stage 2 10 seconds after Stage 1 for blower 10 additional seconds for cooling or heating output

Stage 3 10 seconds after Stage 2

Stage 4 10 seconds after Stage 3

NOTE: For cooling Stages 1 and 2, the stage LED will blink for 10 seconds while the cooling output is delayed after that stage is called for. There is also a delay after the stage is satisfied, and after the LED stops blinking, the stage will turn off. There is a minimum 10-second delay between stages 2 & 3, and 3 & 4, but no delayed output when stage is turned on or off, and LED for those stages will not blink.

BLOWER OPERATION

The controller can be configured to have main HVAC blowers cycle on and off on demand, have all blowers run continuously or have the lead unit blower run continuously with the lag unit blower cycling on demand. Default setting is the blower(s) start and stop on demand. There is also an option to have all blowers cycle on if one remote sensor is connected, and a temperature difference of more than 5°F between any two sensors is observed. This helps to redistribute the heat load within the structure and should reduce compressor operating time.

When any of the stages are satisfied, the stage LED will blink for 10 seconds before the stage is actually turned off.

ADVANCE (SWAP) LEAD/LAG UNIT

FEATURE

Pressing the Advance button for 1 second will cause the lead and lag units to change positions. This may be useful during service and maintenance procedures.

ACCELERATE TIMER FEATURE

Pressing the UP arrow button for 5 seconds will activate an accelerate (speed-up) mode, causing the normal changeover time increments of days to be reduced to seconds. Example: 7 days becomes 7 seconds. When “ACC” displays, release button. Whichever LED is on, indicating lead unit will blink over for each second until the controller switches. This is a check for the timer functionality.

GENERAL PROGRAMMING OVERVIEW

MC4001 Controller Buttons and Function On/Off Button

Comfort Button

Program Button

Advance/Change/Save Button

Up and Down Buttons These buttons are used to change the settings in conjunction with the Advance/Change/Save button when in programming mode.

CONTROLLER PROGRAMMABLE FEATURES AND DEFAULT SETTINGS

Order/ Display Description Range/Choice Default

LSEn Temperature at local (main) sensor — —

SP Cooling setpoint temperature 65 to 90F (18 to 32C) 77F (25C) db Deadband between cooling SP and heating setpoint 2 to 40F (1 to 24C) 17F (9.4C) r1 Temperature at remote sensor 1 location, if connected — — r2 Temperature at remote sensor 2 location, if connected — — cFAn Continuous blower operation None, Lead, Both None deg Controller system operates in F or C F or C F

Alt Alternating Lead-Lag-Lead-Lag sequence or Non-Alternating Lead-Lead-Lag-Lag sequence – Yes = Alternating

Yes or No Yes

LLCO Lead-Lag changeover time (Days) 1 - 30 days, or 0 for disabled 7

HP

Heat pump logic enabled – only for 1-stage heat pumps and forces Lead-Lag sequence (overrides a Non-Alt setting)

Yes or No No

Cbd5 Unit 1 and 2 blowers automatically both run if delta T >5F between any two connected sensors Yes or No Yes

OFde 3-minute lead unit and 4-minute lag unit off delay enabled Yes or No No crun Minimum 3-minute compressor runtime enabled Yes or No No

LoAL Low temperature alarm setpoint 28 to 65F (-2 to 18C) 45F (7.2C)

HAL1 High temperature alarm level #1 setpoint 70F to 120F (21 to 49C) 90F (32C)

HAL2 High temperature alarm level #2 setpoint 70F to 120F (21 to 49C) 95F (35C)

Locd Controller is locked and no changes can be made. Consult building authority.

If locked, display will show Locd if changes attempted

Unlocked

Inter-Stage Differential

ISd2 From Stage 1 to Stage 2 2, 3, 4, 5 or 6F 4

ISd3 From Stage 2 to Stage 3 2 or 3F 2

ISd4 From Stage 3 to Stage 4 2 or 3F 2

On/Off Differential (Hysterisis)

CSon Turn "On" above SP for Stage 1 Cooling +1 or 2F 2

CSoF Turn "Off" below SP for Stage 1 Cooling -1, 2, 3 or 4F -2

Stage 2, 3 and 4 Cooling automatically set same as Stage 1 decisions

HSoo All Heating Stages are equal -/+ on and off differential -1/+1 or -2/+2 -2/+2

CoPr 1 or 2-stage compressor, if set to 1 the 2nd stage Cooling Alarm activates on Cooling Call 2, if set to 2 the 2nd stage Cooling Alarm activates on Cooling Call 3

1 or 2 1 ob5d Differential between local and onboard sensor 12 to 20, OFF 12

Humidity controller setpoint should be in 50-60% relative humidity area: Setting controller to lower settings will result in excessive operating time and operating costs for the electric reheat, and in extreme cases could cause evaporator (indoor) coil freeze-up if there are periods of light internal equipment (heat) loading.

CAUTION

HUMIDITY CONTROL OPTION

NOTE: This function is not available if controller is configured for heat pump.

The standard air conditioning system can be adapted to perform dehumidification control by addition of a simple humidity controller that closes-on-rise, and is connected to terminals H1 and H2 on the main controller board. Recommended Bard Part #8403-038 (H600A 1014). Both HVAC units must be equipped with electric heat for this sequence to work properly.

See appropriate connection diagram (Figures 1-14 on pages 20-33) for this connection:

1. Temperature control always has priority over dehumidification. If there is any stage of cooling demand active, the dehumidification sequence is locked out.

2. If all stages of cooling are satisfied, and relative humidity is above the setpoint of humidity controller:

a. The green “Dehumid. Operation” light will come on, and the lag unit compressor and blower will operate until the setpoint of humidity controller is satisfied (or cancelled by a call for cooling).

b. If the space temperature drops to 67°F, the electric heater of the lead unit will cycle to help maintain building temperature. It will cycle off at 69°F.

c. If space temperature drops to 64°F, the Stage 2 Heating light will come on and the lag unit compressor operating for dehumidification mode will cycle off until the building temperature rises above 65°F from 1st stage heat and building load. The green “Dehumid.

Operation” light stays on during this sequence, and when Stage 2 Heating light is off, the compressor is on. The electric heater in lag unit is locked out in dehumidification mode.

Lag unit outputs G, Y1 and Y2 are all switched on during dehumidification sequence. This is true for both alternating and non-alternating controller configurations.

COOLING OPERATING SEQUENCES

FOR ALTERNATING LEAD/LAG/LEAD/

LAG CONFIGURATION

1. 1-Stage Compressor Units No Economizer

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the compressor will start.

2nd cooling set point is 4°F (default setting, user selectable 2°-6°F) warmer than Stage 1. On a call for 2nd Stage cooling the blower of the lag unit is turned on (if not already on – see Blower Operation on page 8), and the Stage 2 LED will blink for 10 seconds before going solid, at which time the compressor will start.

3rd and 4th stages are functional outputs but there is nothing to be controlled.

2. 2-Stage Compressor Units No Economizer

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the lead unit compressor will start in compressor Stage 1 partial capacity operation.

2nd cooling set point is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd Stage cooling the blower of the lag unit is turned on (if not already on – see Blower Operation on page 8), and the Stage 2 LED will blink for 10 seconds before going solid, at which time the lag unit compressor will start in compressor Stage 1 partial capacity operation.

3rd cooling set point is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the Stage 3 LED comes on solid (no delay), and the lead unit compressor will switch to compressor Stage 2 full capacity operation.

4th cooling set point is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the Stage 4 LED comes on solid (no delay), and the lag unit compressor will switch to compressor Stage 2 full capacity operation.

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see

Blower Operation on page 8), and the Stage 1 LED will blink for 10-seconds before going solid, at which time the lead unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lead unit economizer will operate instead of the compressor. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate instead of the economizer.

2nd cooling set point is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd Stage cooling the blower of the lag unit is turned on (if not already on – see Blower Operation on page 8), and the Stage 2 LED will blink for 10 seconds before going solid, at which time the lag unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lag unit economizer will operate instead of the compressor. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate instead of the economizer.

3rd cooling set point is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the lead unit economizer will close and the compressor will operate.

4th cooling set point is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the lag unit economizer will close and the compressor will operate.

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the lead unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lead unit economizer will operate instead of the compressor. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate instead of the economizer.

2nd cooling set point is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd Stage cooling the blower of the lag unit is turned on (if not already on – see Blower Operation on page 8), and the Stage 2 LED will blink for 10 seconds before going solid, at which time the lag unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lag unit economizer will operate instead of the compressor. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate instead of the economizer.

3rd cooling set point is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the lead unit economizer will continue to operate as long as outdoor conditions are acceptable, and the compressor will operate.

4th cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the lag unit economizer will continue to operate as long as outdoor conditions are acceptable, and the compressor will operate.

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the lead unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lead unit economizer will operate instead of the compressor.

If outdoor conditions are not acceptable for free cooling the compressor will automatically operate on compressor Stage 1 partial capacity instead of the economizer.

2nd cooling set point is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd Stage cooling the blower of the lag unit is turned on (if not already on – see Blower Operation on page 8), and the Stage 2 LED will blink for 10 seconds before going solid, at which time the lag unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lag unit economizer will operate instead of the compressor. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate on compressor Stage 1 partial capacity instead of the economizer.

3rd cooling set point is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the lead unit economizer will close and the compressor will operate on full capacity compressor Stage 2.

4th cooling set point is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the lag unit economizer will close and the compressor will operate on full capacity compressor Stage 2.

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower

Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the lead unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lead unit economizer will operate instead of the compressor.

If outdoor conditions are not acceptable for free cooling the compressor will automatically operate on compressor Stage 1 partial capacity instead of the economizer.

2nd cooling setpoint is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd Stage cooling the blower of the lag unit is turned on (if not already on – see Blower Operation on page 8), and the Stage 2 LED will blink for 10 seconds before going solid, at which time the lag unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lag unit economizer will operate instead of the compressor. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate on compressor Stage 1 partial capacity instead of the economizer.

3rd cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the lead unit economizer will continue to operate as long as outdoor conditions are acceptable, and the compressor will operate on compressor Stage 1 partial capacity. If outdoor conditions are not acceptable for free cooling the lead unit compressor will automatically be operating on compressor Stage 1 partial capacity and will go to Stage 2 full capacity operation.

4th cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the lag unit economizer will continue to operate as long as outdoor conditions are acceptable, and the compressor will operate on compressor Stage 1 partial capacity. If outdoor conditions are not acceptable for free cooling the lag unit compressor will automatically be operating on compressor Stage 1 partial capacity and will go to Stage 2 full capacity operation.

COOLING OPERATING SEQUENCES

FOR NON-ALTERNATING LEAD/LEAD/

LAG/LAG CONFIGURATION

NOTE: Heat pumps cannot be operated in Non- Alternating Lead/Lead/Lag/Lag sequence. Selecting Heat Pump = Yes will override a Non-Alternating selection and force system to Alternating Lead/Lag/ Lead/Lag sequence.

1. 2-Stage Compressor Units No Economizer

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the lead unit compressor will start in compressor Stage 1 partial capacity operation.

2nd cooling setpoint is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1, at which time the lead unit compressor will switch to compressor Stage 2 full capacity.

3rd cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the blower of the lag unit will come on immediately (if not already on – see Blower Operation on page 8), and Stage 3 LED will blink for 10 seconds before going solid, and then the lag unit compressor will start in compressor Stage 1 partial capacity.

4th cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the Stage 4 LED comes on solid (no delay), and the lag unit compressor will switch to compressor Stage 2 full capacity operation.

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the lead unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lead unit economizer will operate instead of the compressor. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate instead of the economizer.

2nd cooling setpoint is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd Stage cooling the lead unit Y2 cooling output turns on.

The lead unit economizer will close and the compressor will operate. If the compressor is already running from 1st stage cooling call due to outdoor conditions being outside of free cooling range no action occurs at 2nd stage setpoint.

3rd cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the blower of the lag unit is turned on (if not already on – see Blower Operation on page 8), and the Stage 3 LED will blink for 10 seconds before going solid, and the lag unit economizer will operate if the outdoor temperature and humidity conditions are below the setpoint of the economizer control. If outdoor conditions are not acceptable for free cooling

the compressor will automatically operate instead of the economizer.

4th cooling set point is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the lag unit economizer will close and the compressor will operate. If the compressor is already running from 3rd stage cooling call due to outdoor conditions being outside of free cooling range no action occurs at 2nd stage setpoint.

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10seconds before going solid, at which time the lead unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lead unit economizer will operate instead of the compressor. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate instead of the economizer.

2nd cooling setpoint is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd stage cooling the lead unit Y2 cooling output turns

on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control, the lead unit economizer will continue to operate and the compressor will operate. If the compressor is already operating on 1st stage cooling because outside free cooling range, no action occurs at 2nd cooling setpoint.

3rd cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the blower of the lag unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 3 LED will blink for 10 seconds before going solid, at which time the lag unit Y1 cooling output turns on. The lag unit economizer will operate if the outdoor temperature and humidity conditions are below the setpoint of the economizer control. If outdoor conditions are not acceptable for free cooling, the compressor will automatically operate instead of the economizer.

4th cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the lag unit Y2 cooling output turns on activating the lag unit compressor. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control, the lag unit economizer will continue to operate. If the compressor is already operating on 3rd stage cooling because outside free cooling range no action occurs at 4th cooling setpoint.

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the lead unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control, the lead unit economizer will operate instead of the compressor.

If outdoor conditions are not acceptable for free cooling, the compressor will automatically operate on compressor Stage 1 partial capacity instead of the economizer.

2nd cooling setpoint is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd stage cooling the lead unit Y2 cooling output turns on, at which time the lead unit compressor will operate on compressor Stage 2 full capacity. If the compressor is already operating on Stage 1 partial capacity because outside free cooling range the compressor will switch to compressor Stage 2 full capacity.

3rd cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the blower of the lag unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 3 LED will blink for 10 seconds before going solid. The lag unit economizer will operate if the outdoor temperature and humidity conditions are below the setpoint of the economizer control. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate on compressor Stage 1 partial capacity instead of the economizer.

4th cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the lag unit Y2 cooling output turns on, at which time the lag unit compressor will operate on compressor Stage 2 full capacity. If the compressor is already operating on Stage 1 partial capacity because outside free cooling range the compressor will switch to compressor Stage 2 full capacity.

1st stage cooling setpoint is the setting (SP) input into the controller. Factory default is 77°F (25°C).

On a call for cooling the blower of the lead unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 1 LED will blink for 10 seconds before going solid, at which time the lead unit Y1 cooling output turns on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lead unit

economizer will operate instead of the compressor.

If outdoor conditions are not acceptable for free cooling the compressor will automatically operate on compressor Stage 1 partial capacity instead of the economizer.

2nd cooling setpoint is 4°F (default setting, user selectable 2-6°F) warmer than Stage 1. On a call for 2nd stage cooling the lead unit Y2 cooling output turns

on. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lead unit economizer will continue to operate, and the compressor will operate on compressor Stage 1 partial capacity. If the compressor is already operating on Stage 1 partial capacity because outside free cooling range the compressor will switch to compressor Stage 2 full capacity.

3rd cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 2. On a call for 3rd Stage cooling the blower of the lag unit will come on immediately (if not already on – see Blower Operation on page 8), and the Stage 3 LED will blink for 10 seconds before going solid, at which time the lag unit Y1 cooling output turns on. The lag unit economizer will operate if the outdoor temperature and humidity conditions are below the setpoint of the economizer control. If outdoor conditions are not acceptable for free cooling the compressor will automatically operate on compressor Stage 1 partial capacity instead of the economizer.

4th cooling setpoint is 2°F (default setting, user selectable 2-3°F) warmer than Stage 3. On a call for 4th Stage cooling the lag unit Y2 cooling output turns on activating the compressor. If the outdoor temperature and humidity conditions are below the setpoint of the economizer control the lag unit economizer will continue to operate, and the compressor will operate on compressor Stage 2 full capacity. If the compressor is already operating on Stage 1 partial capacity because outside free cooling range the compressor will switch to compressor Stage 2 full capacity.

NOTE A: Economizers in ECONWMT-Series are available with either “T” temperature-only outdoor…