22521.00 - Columbia Schools HVAC Upgrades - Mechanical Set - 2 of 3.pdf

PDF 5 MB Posted Nov 21, 2023

Attached to: HVAC Bid Information
Solicitation number: RFP - CSD - 240000000475
Issued by: Jackson County, Michigan

About this file

Written by GovTribe AI · Apr 3, 2024

This document contains mechanical drawings and specifications for HVAC upgrades at Columbia Schools in Michigan. The project includes furnishing and installing new rooftop units, air handling units, and condensing units to replace previously demolished equipment at the Intermediate School and High School. The drawings provide key details on the layout of the new equipment, ductwork, piping, and other mechanical components. The sequence of operations describes how the HVAC systems will be controlled and integrated with the building automation system. This contract opportunity is being bid through Jackson County, Michigan.

The document does not provide pricing terms, set asides, incumbent information, funding sources, or other financial details. It focuses on the technical requirements and scope of work for the HVAC upgrades at the two school facilities.

View the file

Other files

File	Type	Posted
Columbia Schools HVAC Upgrades - Spec Section 230900 - Instrumentation_	—	Nov 21, 2023
Columbia Schools HVAC Upgrades - Addendum 02 - 001116 INVITATION TO BID (1).pdf	PDF	Nov 21, 2023
22521.00 - Columbia Schools HVAC Upgrades - Mechanical Set - 3 of 3.pdf	PDF	Nov 21, 2023
22521.00 - Columbia Schools HVAC Upgrades - Electrical Set.pdf	PDF	Nov 21, 2023
Columbia Shcools HVAC Upgrades - Pre-Bid Conference - Sign-in sheet (1).pdf	PDF	Nov 21, 2023
Columbia Schools HVAC Upgrades - Addendum 01 Write-Up.pdf	PDF	Nov 21, 2023
Columbia Schools HVAC Upgrades - Addendum 02 - Write-Up (1).pdf	PDF	Nov 21, 2023
Columbia Schools HVAC Upgrades - Pre-Bid Walktrhoguh Sign-in Sheet.pdf	PDF	Nov 21, 2023
22521.00 - Columbia Schools HVAC Upgrades - Mechanical Set - 1 of 3.pdf	PDF	Nov 21, 2023
Columbia Schools HVAC Upgrades - Addendum 02 - Drawings (1).pdf	PDF	Nov 21, 2023
22521.00 - Columbia Schools HVAC Upgrades - Combined Specifications - For Bid.pdf	PDF	Nov 21, 2023

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X-RTU

X-EF

X-RTU

X-G

RTU-113

RTU-110

RTU-111

RTU-1

RTU-107

RTU-108

RTU-112

MECHANICAL KEY NOTES

1 FURNISH AND INSTALL NEW ROOFTOP UNIT IN LOCATION OF

PREVIOUSLY DEMOLISHED UNIT. PROVIDE MANUFACTURERS

CURB ADAPTER FOR INSTALLATION ON EXISTING CURB.

MODIFY SA AND RA DUCTWORK AS NECESSARY TO CONNECT

TO NEW RTU. EXTEND GAS PIPING AS REQUIRED FOR A

COMPLETE CONNECTION.

INTERMEDIATE SCHOOL - ROOF PLAN - MECHANICAL NEW (ADD ALTERNATE #1)

SCALE: 1/16" = 1'-0"

10510 4020

M A

T R

I X

X-6''Ø EA

X-10''Ø EA

X-6''Ø EA

X-6''Ø EA X-6''Ø EA

X-6''Ø EA

X-10''Ø EA

X-8''Ø SA

X-14''Ø SA

X-8''Ø SA

X-12''Ø SA

X-8''Ø SA

X-FCU-501

X-FCU-502

X-14''Ø V

THRU ROOF

X-14''Ø V

THRU ROOF

X-EF X-EF

X-SD 330

--- TYP.2 X-SD 330

--- TYP.2

330X-SD

X-EG 150

6''x6'' ---

X-EG 175

6''x6'' ---

175X-EG

---6''x6''

350X-EG

TYP.28''x8''

75X-EG

---6''x6''

75X-EG

---6''x6'' 100X-SD

---8''Ø

100X-SD

---8''Ø

X-10''x20''

OA DN

X-LOUVER

X-54''x20'' OA DN X-56''x20'' RA

X-6''Ø EA (TYP. 3) X-12''Ø EA

X-48''x20'' SA UP

X-CC-502

X-SG

X-RG

X-AHU-502

X-4'' G

X-1'' HS & HR

X-2'' HS & HR

SL & LL

TO CU-502

SL & LL UP THRU

ROOF TO CU-2

SL & LL UP THRU

ROOF TO CU-3

3/4'' CD 3/4'' CD

MECHANICAL KEY NOTES

1 FURNISH AND INSTALL NEW DX COOLING COIL IN EXISTING FAN

COIL UNIT. ROUTE NEW REFRIGERANT PIPING THRU ROOF TO

NEW CONDENSING UNIT.

ROUTE NEW REFRIGERANT PIPING THRU WALL TO NEW

OUTDOOR CONDENSING UNIT.

M A

T R

I X

HIGH SCHOOL - PARTIAL FLOOR PLAN - UNIT 500 - MECHANICAL NEW (BASE BID)

SCALE: 1/8" = 1'-0"

0 1 5 10 20 N

HIGH SCHOOL - MEZZANINE PLAN - UNIT 500 - MECHANICAL NEW (BASE BID)

SCALE: 1/8" = 1'-0"

0 1 5 10 20

RTURTURTU

RTU

RTU RTU RTU

RTU

RTU RTU

RTU

X-RTU

X-RTUX-RTU

X-RTU

X-RTUX-RTUX-RTU

X-RTU

X-EF X-EF

X-EF

X-1'' G

X-2-1/2'' G

X-1'' G

X-4'' GX-2'' G

X-3'' G

TO X-CC-502

RTU-305

AHU-1

CU-1

CU-2

CU-3

RTU-304

X-DX

CU-502

SL & LL DN THRU

ROOF TO X-FCU-501

SL & LL DN THRU

ROOF TO X-FCU-502

MECHANICAL KEY NOTES

1 FURNISH AND INSTALL NEW ROOFTOP UNIT IN LOCATION OF

PREVIOUSLY DEMOLISHED UNIT. PROVIDE MANUFACTURERS

CURB ADAPTER FOR INSTALLATION ON EXISTING CURB.

MODIFY SA AND RA DUCTWORK AS NECESSARY TO CONNECT

TO NEW RTU. EXTEND GAS PIPING AS REQUIRED FOR A

COMPLETE CONNECTION.

FURNISH AND INSTALL NEW AIR HANDLING UNIT IN LOCATION

OF PREVIOUSLY DEMOLISHED UNIT. PROVIDE

MANUFACTURERS CURB ADAPTER FOR INSTALLATION ON

EXISTING CURB. MODIFY SA AND RA DUCTWORK AS

NECESSARY TO CONNECT TO NEW AHU.

FURNISH AND INSTALL NEW CONDENSING UNIT IN LOCATION

SHOWN. ROUTE REFRIGERANT PIPING TO AHU-1.

FURNISH AND INSTALL NEW CONDENSING UNIT IN LOCATION

SHOWN. ROUTE REFRIGERANT PIPING TO ASSOCIATED INDOOR

EQUIPMENT.

HIGH SCHOOL - ROOF PLAN - MECHANICAL NEW (BASE BID)

SCALE: 1/32" = 1'-0"

0 51 10 25 80

M A

T R

UNIT 300

UNIT 200

UNIT 300

X-UH

X-2-1/2'' HS & HR X-2'' HS & HR

X-4'' HS & HR

X-3/4'' HS & HR

3'' HS & HR

PIPING KEY NOTES

INSTALL AND MODIFY NEW HEATING HOT WATER

SUPPLY AND RETURN PIPING AT LOCATION SHOWN.

BALANCE VALVE TO 34.5 GPM.

N INTERMEDIATE SCHOOL - PARTIAL FLOOR PLAN - UNIT 200 - PIPING NEW (ADD ALTERNATE #1)

M A

T R

I X

2'' HS & HR 1-1/2'' HS & HR 1-1/4'' HS & HR1-1/4'' HS & HR

1'' HS & HR

3/4'' HS & HR

3/4'' HS & HR3/4'' HS & HR

3/4'' HS & HR

UNIT 300

UNIT 200

UNIT 300

X-UVX-UV

X-UV

X-1-1/4''

HS & HR

X-1-1/4''

HS & HR

X-2'' HS & HR

3/4'' HS & HR

VAV-1 VAV-2

VAV-4 VAV-6

VAV-5

VAV-3

3/4'' HS & HR 3/4'' HS & HR

PIPING KEY NOTES

MODIFY EXISTING HEATING HOT WATER SUPPLY AND

RETURN PIPING AT LOCATION SHOWN AS NEEDED TO

INSTALL NEW HEATING HOT WATER SUPPLY AND

RETURN PIPING.

N INTERMEDIATE SCHOOL - PARTIAL FLOOR PLAN - UNIT 100 - PIPING NEW (ADD ALTERNATE #1)

M A

T R

I X

ISOLATION

VALVES

FILTER DRYER

EXPANSION VALVE

(TYPICAL)

PITCH

EVAPORATOR COIL

CHARGING

VALVE

PITCH

CONDENSING UNIT

PITCH

SIGHT GLASS

NOTES:

1. PITCH ALL LINES MIN. 1/2" PER 10' IN

DIRECTION OF REFRIGERANT FLOW.

2. INSULATE SUCTION PIPING.

3. KEEP HORIZONTAL DISTANCE OF TRAPS TO

A MINIMUM.

4. PROVIDE TRAPS IF VERTICAL DISTANCE OF

PIPING EXCEEDS 8 FT.

EQUIPMENT MANUFACTURER TO PROVIDE

FACTORY APPROVED PIPING DETAIL VIA SHOP

DRAWINGS TO ENGINEER BEFORE CONSTRUCTION

BEGINS.

13 CONDENSING UNIT PIPING DIAGRAM

SCALE: NTS

TRAP

RECTANGULAR TRANSITIONS, OFFSETS,

AND ELBOWS

SCALE: NTS

RADIUS ELBOW

NOTE:

90° ELBOW SHOWN

SIMILAR RADIUS

CONSTRUCTION FOR

ALL ANGLES

OFFSET

ELBOW

FULL RADIUS

(R=W)

FLOW

AIR

TRANSITION - CONTRACTION FLOW

TRANSITION - DIVERGING FLOW

15°

FLOW

AIR

15°

R=1/ W

15°

4 DUCT TRANSITION DETAIL

SCALE: NTS

SA FLOW

RA FLOW

MAIN AIR DUCT

BALANCING DAMPER IN ALL

SA AND RA BRANCHES TO

AIR OUTLETS

BRANCH AIR DUCT

(TYPICAL)

NOTE:

L=1/4 W (4" MIN.)

45°

TURNING VANES FOR

SQUARE ELBOW DETAIL

SCALE: NTS

FRAME

VANE ELBOW

LOCKING LUG

2-1/4"R

4-1/2"R

TURNING VANE

NOTES:

1. LOCKING LUGS INTEGRAL WITH VANE

2. MAXIMUM UNSUPPORTED VANE LENGTH 48"

3. FRAMES - BOLTED OR RIVETED TO ELBOW

4. VANES AND FRAMES - SAME GAUGE AS ELBOW

2 1 /4"

3 1 /2"

6 DUCT HANGER DETAIL

SCALE: NTSSCALE: NTSSCALE: NTS

HANGER STRAPS HANGER RODS

STRAP HANGER TRAPEZE HANGER

NO POP RIVETS ALLOWED, USE

SELF-TAPPING SHEET METAL SCREWS

ONLY (TYP)

5 DUCT TRANSITION DETAIL

SCALE: NTS

NOTES:

1. "ALTERNATE" FITTINGS SHALL BE

ACCEPTABLE ONLY WHEN DUCT HEIGHT

DOES NOT PERMIT THE USE OF

"PERMITTED" FULL SIZE BELLMOUTH

CONNECTION

2. THIS DETAIL APPLIES TO SINGLE TAKEOFFS

TO DIFFUSER AS WELL AS BRANCH

TAKEOFFS. IT ALSO APPLIES TO TAKEOFFS

IN THE HORIZONTAL AS WELL AS THE

VERTICAL DIRECTION.

DUCT SIZE:

(SEE PLANS)

PREFERRED

TAKE-OFF DETAIL

STANDARD

45° RECTANGULAR

DUCT CONNECTION

(SUPPLY SHOWN,

RETURN/EXHAUST SIMILAR)

BELLMOUTH

CONNECTION

MANUAL VOLUME

DAMPER TYPICAL AT

ALL DUCT

TAKE-OFFS

MAIN DUCT

AIR FLOW

6" min.

2 SUPPLY AIR DIFFUSER DETAIL

SCALE: NTS

CONICAL TAKE-OFF WITH

VOLUME DAMPER (TYP)

SUPPLY AIR

BRANCH DUCT

FLEXIBLE DUCT

LAY-IN CLG TILE (TYP)

CEILING SUPPORT

TEE (TYP)

SUPPLY DIFFUSER

(SEE SCHEDULE FOR

TYPE)

COLLAR

HARD ELBOW

(AS REQ'D)

1 INSULATION DETAIL AT HANGER

SCALE: NTS

14 GAUGE ZINC COATED

SHEET STEEL SADDLE, AT

LEAST 12" LONG

PIPE

INSULATION

THERMAL HANGERS

SHIELD INSERTS (360-DEG)

9 ROOF TOP UNIT

SCALE: NTS

14" HIGH INSULATED

CURB W/ CANT STRIP

WEATHERTIGHT

FLASHING

INSULATION

UNION

GAS COCK

DIRT LEG

(TYP.2)

RTU

ROOF

PROVIDE AND INSTALL

CURB ADAPTER

(CONTRACTOR SHALL

FIELD VERIFY SIZE)

12 VAV TERMINAL UNIT DETAIL

SCALE: NTS

NOTES:

1. FLEXIBLE DUCTWORK SHALL NOT BE PERMITTED

UPSTREAM OF VAV BOXES.

2. DUCT TRANSITIONS SHALL BE A MINIMUM OF 3

DUCT DIAMETERS UPSTREAM OF ANY VAV BOX.

REDUCER OR INCREASER

IF REQUIRED

LINED SHEET METAL RUN-OUT

SIZE AS SHOWN ON PLAN 5 FT.

MIN. BEFORE TAKE OFF

SUPPLY DIFFUSER (SEE

SCHED. FOR TYPE)

COLLAR

FLEX ELBOW

DIFFUSER

NECK SIZE

FLEXIBLE DUCT

PROVIDE HANGER

CEILING

SHEET METAL RUN-OUT

SIZE AS SHOWN ON PLAN

BALANCE DAMPER

FLOW RING

TERMINAL UNIT

SUPPLY AIR

DUCT

CONICAL TAP.

RUNOUT SIZE

PER PLAN

TRANSITION AS

REQUIRED

3 DUCT

DIA. MIN.

5 DUCT DIA. MIN.

6'-0" MAX.

REHEAT COIL

TYPICAL VAV TERMINAL UNIT HYDRONIC

PIPING DIAGRAM (2-WAY CONTROL VALVE)

SCALE: NTS

COIL

3/4" HOSE END

DRAIN VALVE

2-WAY MODULATING

CONTROL VALVE

SHUTOFF VALVE (TYP.)

CIRCUIT SETTER

UNION (TYP)MANUAL AIR VENT

P/T TAP (TYP.)

STRAINER

HOSE END DRAIN VALVE

COIL

MANUAL AIR VENT

2-WAY MODULATING

CONTROL VALVE

BALANCE (TYP.)

CIRCUIT SETTER

SHUT-OFF VALVE

THERMOMETER (TYP.)

UNION (TYP.)

P/T TAP (TYP.)

STRAINER(TYP.)

11 AHU-1 HEATING COIL DETAIL

SCALE: NTS

PATE PIPE CURB (SEE DETAIL)

MIRO 6-HD STAND. SECURE TO ROOF

PER MAUFACTERER RECOMMENDATIONS

ROOF

FASTENING

SCREW

GRADUATED

STEP BOOT(S)

SATINLESS

STEEL CLAMPS

PIPE/CONDUIT

ACRYLIC CLAD

THERMOPLASTIC

COVER

2x2 NAILER

3# INSULATION

HEAVY GAGE GALV.

STEEL ROOF CURB

FLASH TO ROOF

WEATHERTIGHT

NOTE:

SEE PLANS FOR ROOF PENETRATIONS. PROVIDE CONDUIT AS REQUIRED TO ACCOMMODATE

ELECTRICAL AND TEMPERATURE CONTROL REQUIREMENTS OF MECHANICAL EQUIPMENT

3 PIPE CURB DETAIL

SCALE: NTS

M A

T R

SEQUENCE OF OPERATION: RTU -1, 101, 102, 103, 104, 107, 108, 110, 113, 304, 308

BUILDING AUTOMATION SYSTEM INTERFACE:

THE BUILDING AUTOMATION SYSTEM (BAS) SHALL SEND THE CONTROLLER OCCUPIED BYPASS, MORNING WARM-UP/PRE-COOL, OCCUPIED/UNOCCUPIED AND HEAT/COOL MODES. IF A BAS IS NOT PRESENT, OR COMMUNICATION IS LOST WITH THE BAS THE CONTROLLER SHALL OPERATE USING DEFAULT MODES AND

SETPOINTS.

OCCUPIED:

DURING OCCUPIED PERIODS, THE SUPPLY FAN SHALL RUN CONTINUOUSLY AND THE MIXED AIR DAMPERS SHALL OPEN TO MAINTAIN MINIMUM VENTILATION REQUIREMENTS. UPON A CALL FOR DX COOLING, THE UNIT CONTROLLER SHALL ENABLE THE FIRST FIXED SPEED COMPRESSOR. IF THE FIXED SPEED COMPRESSOR CANNOT SATISFY THE LOAD CONDITIONS, THE UNIT CONTROLLER SHALL START THE NEXT FIXED SPEED COMPRESSOR IN SEQUENCE TO ADD TO THE TOTAL UNIT COOLING LOAD PERCENTAGE. THIS PROCESS SHALL REPEAT UNTIL ALL OF THE FIXED SPEED COMPRESSORS HAVE BEEN STARTED OR UNTIL THE ACTIVE SPACE TEMPERATURE SETPOINT IS SATISFIED. IF ECONOMIZING IS ENABLED, THE OUTDOOR AIR OR MIXED AIR DAMPERS SHALL MODULATE TO MAINTAIN THE DISCHARGE AIR TEMPERATURE SETPOINT AND THE RELIEF AIR DAMPER SHALL TRACK THE MIXED AIR DAMPERS. THE DISCHARGE AIR TEMPERATURE SETPOINT SHALL BE DYNAMICALLY RESET BASED ON THE DEVIATION OF ACTUAL SPACE TEMPERATURE FROM THE ACTIVE SPACE TEMPERATURE SETPOINT.

IF THE DISCHARGE AIR TEMPERATURE SENSOR FAILS, THE DX COOLING AND THE GAS HEAT SHALL CONTROL TO MAINTAIN THE ACTIVE SPACE TEMPERATURE SETPOINT AND AN ALARM SHALL ANNUNCIATE AT THE BAS. IF THE DISCHARGE AIR TEMPERATURE SENSOR AND THE SPACE TEMPERATURE SENSOR FAIL, THE DX COOLING SHALL BE DISABLED, THE GAS HEAT SHALL BE DISABLED, AND AN ALARM SHALL ANNUNCIATE AT THE BAS.

UNOCCUPIED:

WHEN THE SPACE TEMPERATURE IS BELOW THE UNOCCUPIED HEATING SETPOINT OF 60.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL BE COMMANDED ON, THE OUTSIDE AIR DAMPER SHALL REMAIN CLOSED AND THE GAS HEAT SHALL BE ENABLED. WHEN THE SPACE TEMPERATURE RISES ABOVE THE UNOCCUPIED HEATING SETPOINT OF

60.0 DEG. F (ADJ.) PLUS THE UNOCCUPIED DIFFERENTIAL OF 4.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL STOP AND THE GAS HEAT SHALL BE DISABLED. WHEN THE SPACE TEMPERATURE IS ABOVE THE UNOCCUPIED COOLING SETPOINT OF 85.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL BE COMMANDED ON, THE OUTSIDE AIR DAMPER SHALL OPEN IF ECONOMIZING IS ENABLED AND REMAIN CLOSED IF ECONOMIZING IS DISABLED AND THE DX COOLING SHALL BE ENABLED. WHEN THE SPACE TEMPERATURE FALLS BELOW THE UNOCCUPIED COOLING SETPOINT OF

85.0 DEG. F MINUS THE UNOCCUPIED DIFFERENTIAL OF 4.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL STOP, THE DX

COOLING SHALL BE DISABLED AND THE OUTSIDE AIR DAMPER SHALL CLOSE.

OPTIMAL START:

THE BAS SHALL MONITOR THE SCHEDULED OCCUPIED TIME, OCCUPIED SPACE SETPOINTS AND SPACE

TEMPERATURE TO CALCULATE WHEN THE OPTIMAL START OCCURS.

OPTIMAL STOP:

THE BAS SHALL MONITOR THE SCHEDULED UNOCCUPIED TIME, OCCUPIED SETPOINTS AND SPACE TEMPERATURE TO CALCULATE WHEN THE OPTIMAL STOP OCCURS. WHEN THE OPTIMAL STOP MODE IS ACTIVE THE UNIT CONTROLLER SHALL MAINTAIN THE SPACE TEMPERATURE TO THE SPACE TEMPERATURE OFFSET SETPOINT.

OUTSIDE AIR DAMPER SHALL REMAIN ENABLED TO PROVIDE MINIMUM VENTILATION.

MORNING WARM-UP MODE:

DURING OPTIMAL START, IF THE SPACE TEMPERATURE IS BELOW THE OCCUPIED HEATING SETPOINT A MORNING WARM-UP MODE SHALL BE ACTIVATED. WHEN MORNING WARM-UP IS INITIATED THE UNIT SHALL ENABLE THE HEATING AND FAN(S). THE OUTSIDE AIR DAMPER SHALL REMAIN CLOSED. WHEN THE SPACE TEMPERATURE REACHES THE OCCUPIED HEATING SETPOINT (ADJ.), THE UNIT SHALL TRANSITION TO THE OCCUPIED MODE.

PRE-COOL MODE:

DURING OPTIMAL START, IF THE SPACE TEMPERATURE IS ABOVE THE OCCUPIED COOLING SETPOINT, PRE-COOL MODE SHALL BE ACTIVATED. WHEN PRE-COOL IS INITIATED THE UNIT SHALL ENABLE THE FAN AND COOLING OR ECONOMIZER. THE OUTSIDE AIR DAMPER SHALL REMAIN CLOSED, UNLESS ECONOMIZING. WHEN THE SPACE TEMPERATURE REACHES OCCUPIED COOLING SETPOINT (ADJ.), THE UNIT SHALL TRANSITION TO THE OCCUPIED

MODE.

OCCUPIED BYPASS:

THE BAS SHALL MONITOR THE STATUS OF THE ON AND CANCEL BUTTONS OF THE SPACE TEMPERATURE SENSOR.

WHEN AN OCCUPIED BYPASS REQUEST IS RECEIVED FROM A SPACE SENSOR, THE UNIT SHALL TRANSITION FROM ITS CURRENT OCCUPANCY MODE TO OCCUPIED BYPASS MODE AND THE UNIT SHALL MAINTAIN THE SPACE

TEMPERATURE TO THE OCCUPIED SETPOINTS (ADJ.).

HEAT/COOL MODE:

WHEN THE SPACE TEMPERATURE RISES ABOVE THE OCCUPIED COOLING SETPOINT THE MODE SHALL TRANSITION TO COOLING. WHEN THE SPACE TEMPERATURE FALLS BELOW THE OCCUPIED HEATING SETPOINT THE MODE SHALL TRANSITION TO HEATING. WHEN THE SPACE TEMPERATURE IS ABOVE THE OCCUPIED COOLING SETPOINT OR BELOW THE OCCUPIED HEATING SETPOINT THE MODE SHALL REMAIN IN ITS LAST STATE. IF THE SPACE TEMPERATURE SENSOR FAILS THE MODE SHALL REMAIN IN ITS LAST STATE AND AN ALARM SHALL ANNUNCIATE AT THE BAS. IF THE LOCAL AND COMMUNICATED SETPOINTS FAIL THE CONTROLLER SHALL DISABLE THE SUPPLY FAN

AND AN ALARM SHALL ANNUNCIATE AT THE BAS.

DEHUMIDIFICATION:

THE UNIT SHALL BE IN DEHUMIDIFICATION MODE IF THE RETURN HUMIDITY IS ABOVE THE DEHUMIDIFICATION SETPOINT. IN THE DEHUMIDIFICATION MODE, THE SUPPLY AIR FAN SHALL BE ENABLED, THE OUTSIDE AIR DAMPER SHALL BE COMMANDED TO MINIMUM POSITION, AND THE UNIT CONTROLLER SHALL ENERGIZE MECHANICAL

COOLING AND THE HOT GAS REHEAT SOLENOID.

MULTI-CIRCUIT UNITS: DURING DEHUMIDIFICATION MODE THE OUTSIDE AIR TEMPERATURE SHALL BE MONITORED.

IF THIS TEMPERATURE RISES ABOVE THE REHEAT CAPACITY LIMIT SETPOINT OR FALLS BELOW THE REHEAT CAPACITY LIMIT SETPOINT – 3.0 DEG. F (ADJ.), THE UNIT SHALL STAGE DOWN OR STAGE UP THE COMPRESSORS RESPECTIVELY TO MEET FULL OR PART LOAD CAPACITY REQUIREMENTS BASED ON AMBIENT TEMPERATURE.

FACTORY INSTALLED HOT GAS REHEAT SHALL ALLOW APPLICATION OF DEHUMIDIFICATION. DEHUMIDIFICATION SHALL BE ALLOWED ONLY WHEN THE OUTSIDE AIR TEMPERATURE IS ABOVE 40.0 DEG. F AND BELOW 100.0 DEG. F.

THE ECONOMIZER OUTSIDE AIR DAMPER SHALL DRIVE TO MINIMUM POSITION DURING DEHUMIDIFICATION.

MULTI-CIRCUIT UNITS: ON A CALL FOR DEHUMIDIFICATION, THE HOT GAS REHEAT VALVE IN CIRCUIT 1 SHALL ENERGIZE AND THE COMPRESSOR(S) SHALL ENABLE. WHEN THE HUMIDITY CONTROL SETPOINT IS SATISFIES, THE VALVE SHALL BE DE-ENERGIZED AND THE COMPRESSOR(S) IN CIRCUIT 1 SHALL BE DISABLED. IF THERE IS A CALL FOR 1ST STAGE COOLING WHILE IN THE DEHUMIDIFICATION MODE, NO ACTION SHALL TAKE PLACE. IF THERE IS A CALL FOR 2ND STAGE COOLING, THE HOT GAS REHEAT VALVE SHALL BE DE-ENERGIZED, AND THE UNIT SHALL REVERT TO THE COOLING MODE. IF 2ND STAGE COOLING IS SATISFIED AND THERE IS STILL A CALL FOR

DEHUMIDIFICATION, THE HOT GAS REHEAT VALVE SHALL ONCE AGAIN BE ENERGIZED.

ECONOMIZER:

ENABLE (COMPARATIVE ENTHALPY): OUTSIDE AIR (OA) ENTHALPY SHALL BE COMPARED WITH RETURN AIR (RA) ENTHALPY POINT. THE ECONOMIZER SHALL ENABLE WHEN OA ENTHALPY IS LESS THAN RA ENTHALPY - 2.0 BTU/LB.

THE ECONOMIZER SHALL DISABLE WHEN OA ENTHALPY IS GREATER THAN RA ENTHALPY.

OPERATION: THE SUPPLY AIR SENSOR SHALL MEASURE THE DRY BULB TEMPERATURE OF THE AIR LEAVING THE EVAPORATOR COIL WHILE ECONOMIZING. WHEN ECONOMIZING IS ENABLED AND THE UNIT IS OPERATING IN THE COOLING MODE, THE ECONOMIZER DAMPER SHALL MODULATE BETWEEN ITS MINIMUM POSITION AND 100% TO MAINTAIN THE SPACE TEMPERATURE SETPOINT. MINIMUM POSITION SHALL BE CALCULATED BASED ON SUPPLY FAN SPEED. IF THE SUPPLY AIR TEMPERATURE STARTS TO FALL BELOW SUPPLY AIR TEMPERATURE SETPOINT, THE OUTDOOR DAMPER SHALL BE AT MINIMUM POSITION. COMPRESSORS SHALL BE DELAYED FROM OPERATING

UNTIL THE ECONOMIZER HAS OPENED TO 100% FOR 5 MINUTES.

DEMAND CONTROL VENTILATION (DCV):

IF THE RETURN AIR CO2 LEVEL IS GREATER THAN OR EQUAL TO THE DESIGN MINIMUM CO2 SETPOINT, THE OUTDOOR AIR DAMPER SHALL OPEN TO THE DESIGN MINIMUM OUTDOOR AIR DAMPER SETPOINT. IF THERE IS A CALL FOR ECONOMIZER COOLING, THE DAMPER MAY BE OPENED FURTHER TO SATISFY THE COOLING REQUEST.

IF THE RETURN AIR CO2 LEVEL IS LESS THAN OR EQUAL TO THE DCV MINIMUM CO2 SETPOINT, THE OUTDOOR AIR DAMPER SHALL CLOSE TO THE DCV MINIMUM OUTDOOR AIR DAMPER SETPOINT. IF THERE IS A CALL FOR ECONOMIZER COOLING, THE DAMPER MAY BE OPENED FURTHER TO SATISFY THE COOLING REQUEST.

IF THE RETURN AIR CO2 LEVEL IS GREATER THAN THE DCV MINIMUM CO2 SETPOINT AND LESS THAN THE DESIGN MINIMUM CO2 SETPOINT, THE OUTDOOR AIR DAMPER POSITION SHALL BE MODULATED PROPORTIONALLY TO THE SPACE CO2 LEVEL RELATIVE TO A TARGET POSITION BETWEEN THE DCV MINIMUM CO2 SETPOINT AND THE DESIGN MINIMUM CO2 SETPOINT. IF THERE IS A CALL FOR ECONOMIZER COOLING, THE DAMPER MAY BE OPENED FURTHER

TO SATISFY THE COOLING REQUEST.

SUPPLY FAN:

THE UNIT CONTROLLER SHALL VARY THE SUPPLY FAN SPEED TO OPTIMIZE MINIMUM FAN SPEED IN ALL COOLING

AND HEATING MODES.

SUPPLY DUCT STATIC PRESSURE CONTROL:

THE UNIT CONTROLLER SHALL MODULATE THE SUPPLY FAN OUTPUT AS REQUIRED TO MAINTAIN THE SUPPLY DUCT STATIC PRESSURE SETPOINT. IF THE SUPPLY DUCT STATIC PRESSURE FALLS BELOW THE SUPPLY AIR STATIC SETPOINT + DEADBAND, THE UNIT CONTROLLER SHALL INCREASE THE OUTPUT TO THE SUPPLY FAN TO MAINTAIN SETPOINT. IF THE SUPPLY DUCT STATIC PRESSURE RISES ABOVE THE SUPPLY AIR STATIC SETPOINT + DEADBAND, THE UNIT CONTROLLER SHALL DECREASE THE OUTPUT TO THE SUPPLY FAN TO MAINTAIN SETPOINT.

RELIEF AIR AND BUILDING PRESSURE CONTROL:

THE RELIEF AIR FAN SHALL ENABLE WHEN THE ECONOMIZER DAMPER POSITION IS EQUAL TO OR GREATER THAN

THE RELIEF AIR FAN SETPOINT.

A DIFFERENTIAL PRESSURE SWITCH SHALL MONITOR THE DIFFERENTIAL PRESSURE ACROSS THE RELIEF AIR FAN.

IF THE SWITCH IS DETECTED TO BE OPEN FOR 40 CONSECUTIVE SECONDS AFTER A REQUEST FOR RELIEF FAN OPERATION A FAN FAILURE ALARM SHALL ANNUNCIATE AT THE BAS AND THE RELIEF FAN SHALL STOP. A MANUAL

RESET SHALL BE REQUIRED.

FILTER STATUS:

A DIFFERENTIAL PRESSURE SWITCH SHALL MONITOR THE DIFFERENTIAL PRESSURE ACROSS THE FILTER(S) WHEN THE FAN IS RUNNING. IF THE SWITCH CLOSES DURING NORMAL OPERATION A DIRTY FILTER ALARM SHALL

ANNUNCIATE AT THE BAS.

SMOKE DETECTOR SHUTDOWN:

THE UNIT SHALL SHUT DOWN IN RESPONSE TO A SIGNAL FROM THE SMOKE DETECTOR INDICATING THE PRESENCE OF SMOKE. THE SMOKE DETECTOR SHALL BE INTERLOCKED TO THE UNIT THROUGH THE DRY CONTACTS OF THE SMOKE DETECTOR. A MANUAL RESET OF THE SMOKE DETECTOR SHALL BE REQUIRED TO

RESTART THE UNIT.

CONDENSATE OVERFLOW SHUTDOWN:

THE UNIT SHALL SHUT DOWN IN RESPONSE TO A SIGNAL FROM THE CONDENSATE OVERFLOW SENSOR. THE SENSOR SHALL BE INTERLOCKED TO THE UNIT COOLING CONTROLLER FOR IMMEDIATE SHUTDOWN OF COOLING.

POINTS LIST: RTU -1, 101, 102, 103, 104, 107, 108, 110, 113, 304, 308

SYSTEM POINT DESCRIPTION POINTS ALARMS

NOTE: THE CONTROL POINTS FOR THE

ASSOCIATE EQUIPMENT INCLUDES, BUT IS NOT

LIMITED TO, THE FOLLOWING POINTS. THE

CONTROLS CONTRACTOR IS RESPONSIBLE FOR

PROVIDING ALL NECESSARY POINTS TO CONTROL

THE EQUIPMENT PER THE SEQUENCE OF

OPERATION.

T (A

(B I)

(B O)

K (H

S (W

LIM

W A

LIM

COMPRESSOR 1 MODULATION COMMAND

CMP1

X X

COMPRESSOR 2 COMMAND

CMP2

X X

COMPRESSOR 3 COMMAND

CMP3

X X

CONDENSATE OVERFLOW DETECTION LOCAL

CND OVRFL

X X X

COOLING OUTPUT COMMAND

CLG

X X

DISCHARGE AIR TEMPERATURE

DAT

X X X

DX COIL FROST STAT

FROSTAT

X X X

HEATING OUTPUT COMMAND

HTG

X X

HOT GAS REHEAT VALVE COMMAND

HGRH

X X

MIXED AIR DAMPER

MAD

X X

OUTSIDE AIR DAMPER COMMAND

OAD

X X

OUTSIDE AIR HUMIDITY LOCAL

OAH

X X X

OUTSIDE AIR TEMPERATURE LOCAL

OAT

X X X

PRIMARY FILTER STATUS LOCAL

FIL

X X X

RELIEF AIR FAN START/STOP

RLF

X X

RELIEF AIR FAN STATUS LOCAL

RLF

X X

RETURN AIR CO2 LOCAL

RA CO2

X X X

RETURN AIR HUMIDITY LOCAL

RAH

X X X

RETURN AIR SMOKE DETECTION LOCAL

RA SD

RETURN AIR TEMPERATURE LOCAL

RAT

X X X

SPACE TEMPERATURE LOCAL (WIRED)

SPT

X X X X

SPACE TEMPERATURE SETPOINT LOCAL (WIRED)

SPT SP

X X

SUPPLY AIR SMOKE DETECTION LOCAL

SA SD

SUPPLY FAN SPEED

SAF

SUPPLY FAN START/STOP

SAF

X X

SUPPLY FAN STATUS LOCAL

SAF

X X

APPLICATION MODE

APP MODE

BAS COMMUNICATION STATE

BAS COM

X X

COMPRESSOR ENABLE

CMP ENA

X X

COMPRESSOR LOCKOUT STATUS

CMP LCK

COOL OUTPUT

CLG

DISCHARGE AIR STATIC PRESSURE SETPOINT

DA SP SPT

X X

ECONOMIZER ENABLE

ECON ENA

ECONOMIZER MINIMUM POSITION SETPOINT

ECON MIN POS SP

X X

FAN MODE COMMAND

FAN MODE

FILTER TIMER HOURS

FIL HRS

HEAT / COOL MODE REQUEST

H/C REQ

X X

HEAT OUTPUT

HTG

OCCUPANCY

OCC

X X

OCCUPIED COOLING SETPOINT

OCC CLG SP

X X

SPACE CO2 HIGH LIMIT

SP CO2 HL

SPACE TEMPERATURE SETPOINT ACTIVE

SPT SP ACT

X X

TIMED OVERRIDE STATUS

TOV

UNOCCUPIED COOLING SETPOINT

UNOCC CLG SP

X X

UNOCCUPIED HEATING SETPOINT

UNOCC HTG SP

X X

1 SZ VAV RTU FLOW DIAGRAM

RAT (AI)

SAF (BI)

RAH (AI)

SAF (AO)

SAF (BO)

RA SD (HDW)

CMP1 (BO)

CMP2 (BO)

CMP3 (BO)

CND OVRFL (BI)OAT (AI)

MAD (AO)

SA SD (HDW)

RLF (BI)

HTG (AO)HGRH (BO)

OAH (AI)

FIL (BI)

SPT (AI)

SPT SP (AI)

FROSTAT (BI)

RA CO2 (AI)RLF (BO)

DAT (AI)

DPT

VSD

ACT

RLF

DPT

LLT

CO2

M A

T R

SEQUENCE OF OPERATION: RTU-111 & RTU-112

BUILDING AUTOMATION SYSTEM INTERFACE:

THE BUILDING AUTOMATION SYSTEM (BAS) SHALL SEND THE CONTROLLER OCCUPIED BYPASS, MORNING WARM-UP/PRE-COOL, OCCUPIED/UNOCCUPIED AND HEAT/COOL MODES. THE BAS SHALL ALSO SEND THE DISCHARGE AIR TEMPERATURE SETPOINT AND THE DUCT STATIC PRESSURE SETPOINT. IF A BAS IS NOT PRESENT, OR COMMUNICATION IS LOST WITH THE BAS THE CONTROLLER SHALL OPERATE USING DEFAULT MODES AND

SETPOINTS.

OCCUPIED:

DURING OCCUPIED PERIODS, THE SUPPLY FAN SHALL RUN CONTINUOUSLY AND THE MIXED AIR DAMPERS SHALL OPEN TO MAINTAIN MINIMUM VENTILATION REQUIREMENTS. THE UNIT CONTROLLER SHALL CONTROL THE SUPPLY FAN SPEED TO MAINTAIN THE CURRENT SUPPLY DUCT STATIC PRESSURE SETPOINT (ADJ.). UPON A CALL FOR DX COOLING, THE UNIT CONTROLLER SHALL ENABLE THE FIRST FIXED SPEED COMPRESSOR. IF THE FIXED SPEED COMPRESSOR CANNOT SATISFY THE LOAD CONDITIONS, THE UNIT CONTROLLER SHALL START THE NEXT FIXED SPEED COMPRESSOR IN SEQUENCE TO ADD TO THE TOTAL UNIT COOLING LOAD PERCENTAGE. THIS PROCESS SHALL REPEAT UNTIL ALL OF THE FIXED SPEED COMPRESSORS HAVE BEEN STARTED OR UNTIL THE ACTIVE SPACE TEMPERATURE SETPOINT IS SATISFIED. IF ECONOMIZING IS ENABLED, THE OUTDOOR AIR OR MIXED AIR DAMPERS SHALL MODULATE TO MAINTAIN THE DISCHARGE AIR TEMPERATURE SETPOINT AND THE RELIEF AIR DAMPER SHALL TRACK THE MIXED AIR DAMPERS. IF THE DISCHARGE AIR TEMPERATURE SENSOR FAILS, THE DX COOLING SHALL BE DISABLED, THE GAS HEAT SHALL BE DISABLED, AND AN ALARM SHALL ANNUNCIATE AT THE

BAS.

UNOCCUPIED:

85.0 DEG. F MINUS THE UNOCCUPIED DIFFERENTIAL OF 4.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL STOP, THE DX

COOLING SHALL BE DISABLED AND THE OUTSIDE AIR DAMPER SHALL CLOSE.

OPTIMAL START:

THE BAS SHALL MONITOR THE SCHEDULED OCCUPIED TIME, OCCUPIED SPACE SETPOINTS AND SPACE

TEMPERATURE TO CALCULATE WHEN THE OPTIMAL START OCCURS.

OPTIMAL STOP:

OUTSIDE AIR DAMPER SHALL REMAIN ENABLED TO PROVIDE MINIMUM VENTILATION.

MORNING WARM-UP MODE:

DURING OPTIMAL START, IF THE AVERAGE SPACE TEMPERATURE IS BELOW THE OCCUPIED HEATING SETPOINT A MORNING WARM-UP MODE SHALL BE ACTIVATED. WHEN MORNING WARM-UP IS INITIATED THE UNIT SHALL ENABLE THE HEATING AND FAN(S). THE OUTSIDE AIR DAMPER SHALL REMAIN CLOSED. WHEN THE SPACE TEMPERATURE REACHES THE OCCUPIED HEATING SETPOINT (ADJ.), THE UNIT SHALL TRANSITION TO THE OCCUPIED MODE.

PRE-COOL MODE:

DURING OPTIMAL START, IF THE AVERAGE SPACE TEMPERATURE IS ABOVE THE OCCUPIED COOLING SETPOINT, PRE-COOL MODE SHALL BE ACTIVATED. WHEN PRE-COOL IS INITIATED THE UNIT SHALL ENABLE THE FAN AND COOLING OR ECONOMIZER. THE OUTSIDE AIR DAMPER SHALL REMAIN CLOSED, UNLESS ECONOMIZING. WHEN THE SPACE TEMPERATURE REACHES OCCUPIED COOLING SETPOINT (ADJ.), THE UNIT SHALL TRANSITION TO THE

OCCUPIED MODE.

OCCUPIED BYPASS:

THE BAS SHALL MONITOR THE STATUS OF THE ON AND CANCEL BUTTONS OF THE SPACE TEMPERATURE SENSORS. WHEN AN OCCUPIED BYPASS REQUEST IS RECEIVED FROM A SPACE SENSOR, THE UNIT SHALL TRANSITION FROM ITS CURRENT OCCUPANCY MODE TO OCCUPIED BYPASS MODE AND THE UNIT SHALL MAINTAIN

THE SPACE TEMPERATURE TO THE OCCUPIED SETPOINTS (ADJ.).

HEAT/COOL MODE:

COOLING: THE UNIT CONTROLLER SHALL USE THE DISCHARGE AIR TEMPERATURE SENSOR AND DISCHARGE AIR TEMPERATURE COOLING SETPOINT TO DETERMINE WHEN TO INITIATE REQUESTS FOR COOLING. DISCHARGE AIR

SETPOINT SHALL BE MAINTAINED BY CONTROLLING THE COOLING AS REQUIRED.

HEATING: THE UNIT CONTROLLER SHALL USE THE DISCHARGE AIR TEMPERATURE SENSOR AND DISCHARGE AIR TEMPERATURE HEATING SETPOINT TO DETERMINE WHEN TO INITIATE REQUESTS FOR HEATING. DISCHARGE AIR SETPOINT SHALL BE MAINTAINED BY CONTROLLING THE HEATING AS REQUIRED. DURING UNOCCUPIED HEATING OR MORNING WARM-UP MODE, THE UNIT HEAT REQUEST SHALL BE COMMUNICATED TO THE SYSTEM VAVS PRIOR TO COMMENCING HEATING OPERATION TO ALLOW VAV UNITS TO OPEN. THE VARIABLE SPEED DRIVE SHALL BE COMMANDED TO 100% AND THE HEAT SHALL BE STAGED ON AND OFF TO SATISFY THE ZONE TEMPERATURE

SETPOINT.

DISCHARGE AIR TEMPERATURE RESET CONTROL:

THE DISCHARGE AIR TEMPERATURE SETPOINT SHALL BE RESET TO THE OPTIMAL SETPOINT COMMUNICATED BY THE BAS. THE BAS SHALL RESET THE DISCHARGE AIR TEMPERATURE SETPOINT BASED ON THE CURRENT OUTSIDE AIR TEMPERATURE, BUT SHALL OVERRIDE THIS RESET FUNCTION AND RETURN THE DISCHARGE AIR TEMPERATURE SETPOINT TO 55.0 DEG. F (ADJ.) IF MORE THAN TWO (ADJ.) ZONES BEGIN TO OVERHEAT. ALSO, THE BAS SHALL OVERRIDE THIS RESET FUNCTION WHENEVER OUTDOOR DEW POINT IS HIGHER THAN 60.0 DEG. F (ADJ.)

OR INDOOR HUMIDITY IS HIGHER THAN 60% RH (ADJ.). IF THE DISCHARGE AIR TEMPERATURE DROPS BELOW THE MINIMUM LIMIT, A LOW TEMPERATURE ALARM SHALL ANNUNCIATE AND THE UNIT SHALL SHUT DOWN. IF THE DISCHARGE AIR TEMPERATURE RISES ABOVE THE MAXIMUM LIMIT, A HIGH TEMPERATURE ALARM SHALL

ANNUNCIATE.

DEHUMIDIFICATION:

COOLING AND THE HOT GAS REHEAT SOLENOID.

MULTI-CIRCUIT UNITS: DURING DEHUMIDIFICATION MODE THE OUTSIDE AIR TEMPERATURE SHALL BE MONITORED.

FACTORY INSTALLED HOT GAS REHEAT SHALL ALLOW APPLICATION OF DEHUMIDIFICATION. DEHUMIDIFICATION SHALL BE ALLOWED ONLY WHEN THE OUTSIDE AIR TEMPERATURE IS ABOVE 40.0 DEG. F AND BELOW 100.0 DEG. F.

THE ECONOMIZER OUTSIDE AIR DAMPER SHALL DRIVE TO MINIMUM POSITION DURING DEHUMIDIFICATION.

DEHUMIDIFICATION, THE HOT GAS REHEAT VALVE SHALL ONCE AGAIN BE ENERGIZED.

ECONOMIZER:

ENABLE (COMPARATIVE ENTHALPY): OUTSIDE AIR (OA) ENTHALPY SHALL BE COMPARED WITH RETURN AIR (RA) ENTHALPY POINT. THE ECONOMIZER SHALL ENABLE WHEN OA ENTHALPY IS LESS THAN RA ENTHALPY - 2.0 BTU/LB.

THE ECONOMIZER SHALL DISABLE WHEN OA ENTHALPY IS GREATER THAN RA ENTHALPY.

OPERATION: THE SUPPLY AIR SENSOR SHALL MEASURE THE DRY BULB TEMPERATURE OF THE AIR LEAVING THE EVAPORATOR COIL WHILE ECONOMIZING. WHEN ECONOMIZING IS ENABLED AND THE UNIT IS OPERATING IN THE COOLING MODE, THE ECONOMIZER DAMPER SHALL BE MODULATED BETWEEN ITS MINIMUM POSITION AND 100% TO MAINTAIN THE DISCHARGE AIR TEMPERATURE SETPOINT. THE ECONOMIZER DAMPER SHALL MODULATE TOWARD MINIMUM POSITION IN THE EVENT THE DISCHARGE AIR TEMPERATURE FALLS BELOW THE DISCHARGE LOW LIMIT TEMPERATURE SETPOINT. COMPRESSORS SHALL BE DELAYED FROM OPERATING UNTIL THE

ECONOMIZER HAS OPENED TO 100%.

DEMAND CONTROL VENTILATION (DCV):

IF THE RETURN AIR CO2 LEVEL IS LESS THAN OR EQUAL TO THE DCV MINIMUM CO2 SETPOINT, THE OUTDOOR AIR

DAMPER SHALL CLOSE TO THE DCV MINIMUM OUTDOOR AIR DAMPER SETPOINT. IF THERE IS A CALL FOR ECONOMIZER COOLING, THE DAMPER MAY BE OPENED FURTHER TO SATISFY THE COOLING REQUEST.

TO SATISFY THE COOLING REQUEST.

SUPPLY FAN:

THE SUPPLY FAN SHALL BE ENABLED WHILE IN THE OCCUPIED MODE AND CYCLED ON DURING THE UNOCCUPIED

MODE.

SUPPLY DUCT STATIC PRESSURE CONTROL:

DURING THE OCCUPIED MODE THE UNIT CONTROLLER SHALL MODULATE THE OUTPUT TO THE VARIABLE SPEED DRIVE AS REQUIRED TO MAINTAIN THE SUPPLY DUCT STATIC PRESSURE SETPOINT OF 1.5 INCHES OF W.C. (ADJ.).

IF THE SUPPLY DUCT STATIC PRESSURE FALLS BELOW 1.3 INCHES OF W.C. (ADJ.) THE UNIT CONTROLLER SHALL INCREASE THE OUTPUT TO THE VARIABLE SPEED DRIVE TO MAINTAIN SETPOINT. IF THE SUPPLY DUCT STATIC PRESSURE RISES ABOVE 1.7 INCHES OF W.C. (ADJ.) THE UNIT CONTROLLER SHALL DECREASE THE OUTPUT TO THE VARIABLE SPEED DRIVE TO MAINTAIN SETPOINT. UPON A CALL FOR HEATING OR COOLING IN THE UNOCCUPIED MODE THE UNIT CONTROLLER SHALL MODULATE THE SPEED OF THE VARIABLE SPEED DRIVE TO 100%.

STATIC PRESSURE HIGH LIMIT:

IF FOR ANY REASON THE SUPPLY AIR PRESSURE EXCEEDS THE SUPPLY AIR PRESSURE HIGH LIMIT, THE SUPPLY FAN SHALL SHUT DOWN. THE UNIT SHALL BE ALLOWED TO RESTART THREE TIMES AFTER A 15 MINUTE OFF PERIOD. IF THE OVERPRESSURIZATION CONDITION OCCURS ON THE FOURTH RESTART, THE UNIT SHALL SHUT DOWN AND A MANUAL RESET DIAGNOSTIC IS DISPLAYED AT THE REMOTE PANEL AND/OR THE BAS SYSTEM.

RELIEF AIR AND BUILDING PRESSURE CONTROL:

THE RELIEF AIR FAN SHALL ENABLE WHEN THE ECONOMIZER DAMPER POSITION IS EQUAL TO OR GREATER THAN

THE RELIEF AIR FAN SETPOINT.

A DIFFERENTIAL PRESSURE SWITCH SHALL MONITOR THE DIFFERENTIAL PRESSURE ACROSS THE RELIEF AIR FAN.

IF THE SWITCH IS DETECTED TO BE OPEN FOR 40 CONSECUTIVE SECONDS AFTER A REQUEST FOR RELIEF FAN OPERATION A FAN FAILURE ALARM SHALL ANNUNCIATE AT THE BAS AND THE RELIEF FAN SHALL STOP. A MANUAL

RESET SHALL BE REQUIRED.

FILTER STATUS:

A DIFFERENTIAL PRESSURE SWITCH SHALL MONITOR THE DIFFERENTIAL PRESSURE ACROSS THE FILTER(S) WHEN THE FAN IS RUNNING. IF THE SWITCH CLOSES DURING NORMAL OPERATION A DIRTY FILTER ALARM SHALL

ANNUNCIATE AT THE BAS.

SMOKE DETECTOR SHUTDOWN:

RESTART THE UNIT.

CONDENSATE OVERFLOW SHUTDOWN:

THE UNIT SHALL SHUT DOWN IN RESPONSE TO A SIGNAL FROM THE CONDENSATE OVERFLOW SENSOR. THE SENSOR SHALL BE INTERLOCKED TO THE UNIT COOLING CONTROLLER FOR IMMEDIATE SHUTDOWN OF COOLING.

POINTS LIST: RTU-111 & RTU-112

SYSTEM POINT DESCRIPTION POINTS ALARMS

NOTE: THE CONTROL POINTS FOR THE ASSOCIATE

EQUIPMENT INCLUDES, BUT IS NOT LIMITED TO, THE

FOLLOWING POINTS. THE CONTROLS CONTRACTOR

IS RESPONSIBLE FOR PROVIDING ALL NECESSARY

POINTS TO CONTROL THE EQUIPMENT PER THE

SEQUENCE OF OPERATION.

T (A

(B I)

(B O)

K (H

S (W

LIM

W A

LIM

COMPRESSOR 1 MODULATION COMMAND

CMP1

X X

COMPRESSOR 2 COMMAND

CMP2

X X

COMPRESSOR 3 COMMAND

CMP3

X X

CONDENSATE OVERFLOW DETECTION LOCAL

CND OVRFL

X X X

COOLING OUTPUT COMMAND

CLG

X X

DISCHARGE AIR STATIC PRESSURE LOCAL

DA SP

X X X X

DISCHARGE AIR TEMPERATURE

DAT

X X X

DX COIL FROST STAT

FROSTAT

X X X

HEATING OUTPUT COMMAND

HTG

X X

HOT GAS REHEAT VALVE COMMAND

HGRH

X X

MIXED AIR DAMPER

MAD

X X

OUTSIDE AIR DAMPER COMMAND

OAD

X X

OUTSIDE AIR HUMIDITY LOCAL

OAH

X X X

OUTSIDE AIR TEMPERATURE LOCAL

OAT

X X X

PRIMARY FILTER STATUS LOCAL

FIL

X X X

RELIEF AIR FAN START/STOP

RLF

X X

RELIEF AIR FAN STATUS LOCAL

RLF

X X

RETURN AIR CO2 LOCAL

RA CO2

X X X

RETURN AIR HUMIDITY LOCAL

RAH

X X X

RETURN AIR SMOKE DETECTION LOCAL

RA SD

RETURN AIR TEMPERATURE LOCAL

RAT

X X X

SPACE TEMPERATURE (COMMUNICATED)

SPT

X X

SPACE TEMPERATURE SETPOINT (COMMUNICATED)

SPT SP

X X

SUPPLY AIR SMOKE DETECTION LOCAL

SA SD

SUPPLY FAN SPEED

SAF

SUPPLY FAN START/STOP

SAF

X X

SUPPLY FAN STATUS LOCAL

SAF

X X

APPLICATION MODE

APP MODE

BAS COMMUNICATION STATE

BAS COM

X X

COMPRESSOR ENABLE

CMP ENA

X X

COMPRESSOR LOCKOUT STATUS

CMP LCK

COOL OUTPUT

CLG

DISCHARGE AIR STATIC PRESSURE SETPOINT

DA SP SPT

X X

ECONOMIZER ENABLE

ECON ENA

ECONOMIZER MINIMUM POSITION SETPOINT

ECON MIN POS SP

X X

FAN MODE COMMAND

FAN MODE

FILTER TIMER HOURS

FIL HRS

HEAT / COOL MODE REQUEST

H/C REQ

X X

HEAT OUTPUT

HTG

OCCUPANCY

OCC

X X

OCCUPIED COOLING SETPOINT

OCC CLG SP

X X

SPACE CO2 HIGH LIMIT

SP CO2 HL

SPACE TEMPERATURE SETPOINT ACTIVE

SPT SP ACT

X X

TIMED OVERRIDE STATUS

TOV

UNOCCUPIED COOLING SETPOINT

UNOCC CLG SP

X X

UNOCCUPIED HEATING SETPOINT

UNOCC HTG SP

X X

1 VAV RTU FLOW DIAGRAM

RAT (AI)

SAF (BI)

RAH (AI)

SAF (AO)

SAF (BO)

RA SD (HDW)

CMP1 (BO)

CMP2 (BO)

CMP3 (BO)

CND OVRFL (BI)OAT (AI)

MAD (AO)

SA SD (HDW)

RLF (BI)

HTG (AO)HGRH (BO)

OAH (AI)

FIL (BI) FROSTAT (BI)

SPT (NET)

SPT SP (NET)

RA CO2 (AI)

DA SP (AI)

RLF (BO)

DAT (AI)

DPT

VSD

ACT

RLF

DPT

LLT

CO2

DPT

M A

T R

A000-2252100

M100-2252100

M300-2252100

M301-2252100

M302-2252100

M303-2252100

M304-2252100

M305-2252100

M400-2252100

M401-2252100

M402-2252100

M403-2252100

M404-2252100

M600-2252100

M601-2252100

M800-2252100

M801-2252100

M802-2252100

M803-2252100

M804-2252100

M900-2252100

File details come from the government source that posted it. Updated Apr 3, 2024.