Revised Drawing M-701 Temperature Controls.pdf

74490

L.D. HENDRIX, JR

GN

S S

A

I ON EL

T

F EGE

P R O

R

SI NRE I

E E R

D

E

AT

S

ET

O

OI

HO

F

FREDRICK, FREDRICK & HELLER

ENGINEERS, INC.

672 EAST ROYALTON ROAD

BROADVIEW HTS., OHIO 44147

TEL. (440) 546-9696

FAX: (440) 546-9699

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

FINAL CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Louis Stokes

Cleveland

VA Medical

Center

U.S. Department of Veterans Affairs

B

C

D

E

F

A

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

ARCHITECT OF RECORD STAMPCONSULTANT

321 4 5 6 7 8 9 10

Consulting Engineers

BARBER & HOFFMAN, INC.

2217 East 9th Street, Suite 350 Cleveland, OH 44115-1257 216-875-0100/ (F) 216-875-0111 barberhoffman.com

DESIGN AND CONSTRUCTION DOCUMENTS AS

INSTRUMENTS OF SERVICE ARE GIVEN IN

CONFIDENCE AND REMAIN THE PROPERTY OF

PERSPECTUS ARCHITECTURE. THE USE OF THIS

DESIGN AND THESE CONSTRUCTION DOCUMENTS

FOR PURPOSES OTHER THAN THE SPECIFIC

PROJECT NAMED HEREIN IS STRICTLY PROHIBITED WITHOUT THE

EXPRESSED WRITTEN CONSENT OF PERSPECTUS

ARCHITECTURE.

COPYRIGHT C 2019.

13212 Shaker Square Cleveland, Ohio 44120 P. 216.752.1800 F. 216.752.3833

Expand MRI Suite 541-CSI-103

CLEVELAND, OHIO

19026

Z M y D o c u m e n ts

\1

F F

H C

F R c c a m p b e ll.

rv t

/1

/2

:3

:1

P

M

M-701

TEMPERATURE CONTROLS

11/15/2019 LDH DML

AHU-N-1-1 CONTROL DIAGRAM

RETURN AIR TEMP - MIXED AIR TEMP

RETURN AIR TEMP - OUTSIDE AIR TEMP

%OA= X 100

TH

I - RETURN AIRFLOW

OA

H L T

I - FREEZESTAT

N.C.

N.O.

M

M

O - MIXED AIR DAMPER

T

I - MIXED AIR TEMP (TS-1)

I - RETURN AIR TEMP (TS-5)

N.C.

STEAM

O - PREHEAT VALVE

LPR

LPS

RA

I - RETURN AIR SMOKE DETECTOR

EA

I - RETURN AIR HUMIDITY

I - PREFILTER STATUS

CHW

O - COOLING VALVE

CHS

CHR

I - SUPPLY AIRFLOW

MM

M

M

O - RETURN SMOKE DAMPER

T

I - OUTDOOR AIR TEMP

I - OUTSIDE AIRFLOW

T

T

I - AIR TEMP (TS-3)

I - SMOKE DAMPER STATUS

H L T

I - SUPPLY AIR TEMP (TS-4)

I - SUPPLY AIR SMOKE DETECTOR

I - SUPPLY AIR HUMIDITY

O - HUMIDIFIER

O - HUMIDIFIER ENABLE

H L

I - HIGH STATIC SHUTDOWN

I - FINAL FILTER STATUS

H L

I - SUPPLY AIR STATIC PRESSURE

SA

H

STM

M

M

CS

VSMC

O - SUPPLY FAN ENABLE/DISABLE

I - SUPPLY FAN STATUS

O - SUPPLY FAN VFD SPEED

I - SUPPLY FAN VFD FAULT

M

O - DISCHARGE SMOKE DAMPER

I - SUPPLY FAN VFD HOA

I - SMOKE DAMPER STATUS

M

CS

VSMC

O - RETURN FAN ENABLE/DISABLE

I - RETURN FAN STATUS

O - RETURN FAN VFD SPEED

I - RETURN FAN VFD FAULT

I - RETURN FAN VFD HOA

O - OUTSIDE AIR DAMPER

O - EXHAUST AIR DAMPER

MINIMUM

I - AIR TEMP

(TS-2)

RF

SF

H L

I - LOW STATIC SHUTDOWN

36"

LOCATE

APPROXIMATELY 2/3

DISTANCE DOWN

LONGEST DUCT RUN

1. RUN CONDITIONS - SCHEDULED

1.1 THE UNIT SHALL RUN BASED UPON AN OPERATOR ADJUSTABLE SCHEDULE.

2. FREEZE PROTECTION

2.1 THE UNIT SHALL SHUT DOWN AND GENERATE AN ALARM UPON RECEIVING A

FREEZESTAT STATUS. WHEN THE FREEZE STAT IS TRIPPED THE FOLLOWING

SEQUENCE SHALL OCCUR:

2.2 THE OUTSIDE AIR AND EXHAUST DAMPERS SHALL CLOSE AND THE MIXED AIR

DAMPER SHALL BE OPEN.

2.3 STEAM PREHEAT COIL VALVE SHALL OPEN TO 100%(ADJ)

2.4 COOLING COIL VALVE SHALL OPEN TO 50%(ADJ)

3. HIGH/LOW STATIC SAFETY SHUTDOWN

3.1 THE UNIT SHALL SHUT DOWN AND GENERATE AN ALARM UPON RECEIVING A HIGH

STATIC SHUTDOWN SIGNAL. HIGH STATIC ALARM SETPOINT SHALL BE 1" BELOW

DUCTWORK PRESSURE CLASS.

3.2 THE UNIT SHALL SHUT DOWN AND GENERATE AN ALARM UPON RECEIVING A LOW

STATIC SHUTDOWN SIGNAL. LOW STATIC ALARM SETPOINT SHALL BE NEGATIVE 2" S.P.

4. SMOKE DETECTION

4.1 THE UNIT SHALL SHUT DOWN AND GENERATE AN ALARM UPON A DETECTOR TRIP ON

SUPPLY AIR OR RETURN AIR SMOKE DETECTOR. DISCHARGE AND RETURN SMOKE

DAMPERS SHALL CLOSE IN THIS EVENT.

5. SUPPLY FAN(S)

5.1 THE SUPPLY FAN SHALL RUN ANYTIME THE UNIT IS COMMANDED TO RUN, UNLESS

SHUTDOWN ON SAFETIES.

5.2 ALARMS:

SUPPLY FAN FAILURE

6. SUPPLY AIR DUCT STATIC PRESSURE CONTROL

6.1 THE CONTROLLER SHALL MEASURE DUCT STATIC PRESSURE AND SHALL MODULATE

THE SUPPLY FAN VFD SPEED TO MAINTAIN THE DUCT STATIC PRESSURE SETPOINT.

THE SUPPLY FAN VFD SPEED SHALL NOT DROP BELOW 30%(ADJ.). THE INITIAL DUCT

STATIC PRESSURE SETPOINT SHALL BE 1.0", AND BE ADJUSTED UP DURING THE

BALANCING PROCESS. THE FINAL DUCT STATIC PRESSURE SETPOINT SHALL BE

DETERMINED, SET, AND DOCUMENTED BY THE BALANCING CONTRACTOR. THE

SETPOINT SHALL BE SUFFICIENT TO MEET THE VAV BOX AIRFLOW REQUIREMENTS

DURING DESIGN CONDITIONS.

6.2 ALARMS:

HIGH SUPPLY FAN STATIC PRESSURE

LOW SUPPLY FAN STATIC PRESSURE

SUPPLY FAN VFD FAULT

7. RETURN FAN(S)

7.1 THE RETURN FAN SHALL RUN WHENEVER THE SUPPLY FAN RUNS.

7.2 ALARMS

RETURN FAN FAILURE

RETURN FAN VFD FAULT

8. RETURN AIRFLOW

8.1 THE RETURN FAN VFD SHALL MODULATE IN UNISON WITH THE SUPPLY FAN VFD.

RETURN AIRFLOW SETPOINT SHALL BE EQUAL TO SUPPLY AIR FLOW MINUS 10%(ADJ.)

AND MINUS EXHAUST AIR FLOW. THE RETURN FAN VFD SPEED SHALL NOT DROP

BELOW 20%(ADJ.)

8.2 ALARMS

HIGH RETURN AIRFLOW (10% ABOVE SUPPLY AIRFLOW)

LOW RETURN AIRFLOW (30% BELOW SUPPLY AIRFLOW)

9. PREHEAT COIL

9.1 THE CONTROLLER SHALL MEASURE THE PREHEAT SECTION AIR TEMPERATURE (TS-2)

AND MODULATE THE PREHEAT COIL VALVE TO MAINTAIN SETPOINT. THE PREHEAT

SECTION TEMPERATURE SETPOINT SHALL EQUAL THE SUPPLY AIR TEMPERATURE

SETPOINT MINUS THE FAN HEAT OFFSET VALUE.

9.2 PREHEAT COIL SHALL BE ENABLED WHENEVER:

OUTSIDE AIR TEMPERATURE IS LESS THAN 50 DEG(ADJ),

AND THE ECONOMIZER IS DISABLED

AND THE SUPPLY FAN STATUS IS ON

9.3 THE PREHEAT COIL SHALL OPEN FOR FREEZE PROTECTION WHENEVER:

MIXED AIR TEMPERATURE DROPS BELOW 36 DEG F (ADJ.)

OR THE FREEZESTAT IS ON.

10. SUPPLY AIR TEMPERATURE SETPOINT

10.1 THE CONTROLLER SHALL MONITOR THE SUPPLY AIR TEMPERATURE (TS-4) AND SHALL

MAINTAIN A SUPPLY AIR TEMPERATURE SETPOINT RESET BASED ON ZONE COOLING

AND HEATING REQUIREMENTS.

10.2 THE SUPPLY AIR TEMPERATURE SETPOINT SHALL BE RESET FOR COOLING BASED ON

ZONE COOLING REQUIREMENTS AS FOLLOWS:

THE INITIAL SUPPLY AIR TEMPERATURE SETPOINT SHALL BE 55 DEG F(ADJ.)

AS COOLING DEMAND INCREASES (i.e. 75% OF THE BOXES ARE IN COOLING), THE SETPOINT

SHALL INCREMENTALLY RESET DOWN TO A MINIMUM OF 53 DEG F (ADJ.)

AS COOLING DEMAND DECREASES (i.e. 75% OF THE BOXES ARE IN HEATING), THE SETPOINT

SHALL INCREMENTALLY RESET UP TO A MAXIMUM OF 58 DEG F (ADJ.).

11. COOLING COIL

11.1 THE CONTROLLER SHALL MEASURE THE SUPPLY AIR TEMPERATURE (TS-4) AND

MODULATE THE COOLING COIL VALVE TO MAINTAIN THE SUPPLY AIR TEMPERATURE

SETPOINT.

11.2 THE COOLING SHALL BE ENABLED WHENEVER:

OUTSIDE AIR TEMPERATURE IS GREATER THAN 50 DEGREES

AND THE SUPPLY FAN STATUS IS ON

AND THE HEATING IS NOT ACTIVE

11.4 THE COOLING COIL VALVE SHALL OPEN TO 50%(ADJ.) WHENEVER THE FREEZESTAT IS

ON.

11.5 ALARMS

HIGH SUPPLY AIR TEMPERATURE ALARM, THE CONTROLLER SHALL ALARM IF THE SUPPLY

AIR TEMPERATURE(TS-4) IS 5 DEG F(ADJ.) GREATER THAN THE SUPPLY AIR SETPOINT.

LOW SUPPLY AIR TEMPERATURE ALARM, THE CONTROLLER SHALL ALARM IF THE SUPPLY AIR

TEMPERATURE IS LESSTHAN 45 DEG F(ADJ.).

12. ECONOMIZER

12.1 THE CONTROLLER SHALL MEASURE THE MIXED AIR TEMPERATURE AND MODULATE

THE OUTSIDE AIR AND EXHAUST AIR DAMPERS IN SEQUENCE TO MAINTAIN THE ECONOMIZER

TEMPERATURE SETPOINT (TS-4). THE OUTSIDE AIR DAMPER SHALL MAINTAIN A

MINIMUM ADJUSTABLE POSITION TO MAINTAIN MINIMUM OUTSIDE AIR REQUIRED.

12.2 THE ECONOMIZER SHALL BE ENABLED WHENEVER:

OUTSIDE AIR TEMPERATURE IS LESS THAN 60 DEG F(ADJ)

AND THE OA TEMPERATURE IS LESS THAN THE RETURN AIR TEMPERATURE

AND THE OA ENTHALPY IS LESS THAN THE RETURN AIR ENTHALPY

AND THE SUPPLY FAN STATUS IS ON

12.3 THE OUTSIDE AIR DAMPER SHALL CLOSE WHENEVER:

MIXED AIR TEMPERATURE DROPS BELOW 36 DEG F(ADJ.)

OR THE FREEZESTAT IS ON

OR THE SUPPLY FAN STATUS IS OFF

12.4 THE OUTSIDE AND EXHAUST AIR DAMPERS SHALL CLOSE AND THE MIXED AIR

DAMPER SHALL OPEN WHEN THE UNIT IS OFF.

13. HUMIDIFIER CONTROL

13.1 THE CONTROLLER SHALL MEASURE THE RETURN AIR HUMIDITY AND MODULATE THE

HUMIDIFIER TO MAINTAIN A SETPOINT OF 35% RH(ADJ.). THE HUMIDIFIER SHALL BE

ENABLED WHENEVER THE SUPPLY FAN STATUS IS ON AND THE OUTSIDE AIR

TEMPERATURE IS BELOW 65 DEGREES.

13.2 THE HUMIDIFIER SHALL TURN OFF WHENEVER:

SUPPLY AIR HUMIDITY MEASURERS 90%

OR WHEN OUTSIDE AIR TEMPERATURE IS ABOVE 65 DEGREES

OR ON A LOSS OF SUPPLY FAN STATUS

13.3 ALARMS

HIGH SUPPLY AIR HUMIDITY 90%(ADJ)

LOW SUPPLY AIR HUMIDITY 30%(ADJ)

14. AIRFLOW CONTROL

14.1 THE CONTROL SYSTEM SHALL MONITOR AND DISPLAY SUPPLY AIR FLOW, RETURN AIR

FLOW, AND MIXED AIR FLOW IN CFM. IT WILL CALCULATE, AND DISPLAY OUTDOOR AIR

PERCENTAGE FROM THE MEASURED VALUES BASED ON THE FOLLOWING FORMULA:

14.2 THE OUTSIDE AIR DAMPER SHALL BE CONTROLLED AS FOLLOWS:

14.2.1 WHEN OUTSIDE AIR TEMPERATURE IS BELOW 50 DEGREES AND THE

ECONOMIZER CONTROL SEQUENCE HAS REDUCED THE OUTSIDE AIRFLOW

DOWN TO THE MINIMUM OUTSIDE AIR FLOW RATE, THE OUTSIDE AIR DAMPER

SHALL BE MODULATED TO MAINTAIN THE MINIMUM AIRFLOW SETPOINT.

14.2.2 WHEN THE AIR HANDLING UNIT CONTROLS ARE OPERATING IN ECONOMIZER

MODE, THE ECONOMIZER CONTROL SEQUENCE WILL MODULATE THE

OUTSIDE AIR DAMPER TO MAINTAIN THE MIXED AIR ECONOMIZER

TEMPERATURE SETPOINT. THE OUTSIDE AIR CALCULATION ABOVE IN 14.1

SHALL DISPLAY THE OUTSIDE AIR PERCENTAGE BUT WILL NOT BE USED TO

CONTROL THE OUTSIDE AIR DAMPER IN THE ECONOMIZER MODE.

14.2.3 WHEN OUTSIDE AIR TEMPERATURE IS ABOVE 60 DEGREES AND THE

ECONOMIZER IS NOT ENABLED BASED ON THE OUTSIDE AIR TEMPERATURE OR

ENTHALPY PER 12.2 ABOVE, THE CONTROL SEQUENCE SHALL REDUCE THE

OUTSIDE AIRFLOW DOWN TO THE MINIMUM OUTSIDE AIR FLOW RATE. THE

OUTSIDE AIR DAMPER SHALL CLOSE TO A PRESET POSITION. THE PRESET

DAMPER POSITION SHALL BE DETERMINED BASED ON ADJUSTING THE

DAMPER POSITION AND MEASURING THE OUTSIDE AIRFLOW, WITH THE

SUPPLY AND RETURN FANS OPERATING AT 100% CAPACITY, UNTIL THE

MINIMUM OUTSIDE AIRFLOW IS MEASURED. THE OUTSIDE AIR CALCULATION

ABOVE IN 14.1 SHALL DISPLAY THE OUTSIDE AIR PERCENTAGE BUT WILL NOT

BE USED TO CONTROL THE OUTSIDE AIR DAMPER. WHEN THE OUTSIDE AIR

TEMPERATURE AND THE RETURN TEMPERATURE ARE EQUAL, ADJUST THE

RETURN AIR TEMPERATURE UPWARD BY 0.1 DEGREE F TO ENABLE THE

OUTSIDE AIR CALCULATION TO FUNCTION.

15. FILTERS

15.1 ALARMS

PREFILTER DIRTY -DIFFERENTIAL PRESSURE IS 1" GREATER THAN CLEAN FILTER

FINAL FILTER DIRTY -DIFFERENTIAL PRESSURE IS 1" GREATER THAN CLEAN FILTER

16. FAN HEAT OFFSET VALUE

16.1 FAN HEAT OFFSET (0-5)- THE BCS SHALL RESET THE FAN HEAT OFFSET VALUE BASED

UPON THE DIFFERENCE BETWEEN SUPPLY AIR SETPOINT AND SUPPLY AIR

TEMPERATURE. THE LOWER LIMIT SHALL BE 0. THE UPPER LIMIT SHALL BE 5.

16.2 WHEN SUPPLY AIR TEMPERATURE SENSOR INDICATES A TEMPERATURE OF 2°F BELOW

THE SUPPLY AIR SETPOINT, THE PDI LOOP SHALL SUBTRACT 1 FROM THE FAN HEAT

OFFSET VALUE. IF THE FAN HEAT OFFSET VALUE IS GREATER THAN 0, THEN THE FAN

HEAT OFFSET SHALL BE SET TO 0. AFTER AN ADJUSTABLE PERIOD OF 15 MINUTES THE

PID LOOP SHALL COMPARE THE SUPPLY TEMPERATURE TO THE SETPOINT AND ADJUST

THE VALUE.

16.3 WHEN SUPPLY AIR TEMPERATURE SENSOR INDICATES A TEMPERATURE + OR - 2°F OF

THE SUPPLY AIR SETPOINT, THE PDI LOOP SHALL ADD ZERO TO THE FAN HEAT OFFSET

VALUE. AFTER AN ADJUSTABLE PERIOD OF 15 MINUTES THE PID LOOP SHALL COMPARE

THE SUPPLY TEMPERATURE TO THE SETPOINT AND ADJUST THE VALUE.

16.4 WHEN SUPPLY AIR TEMPERATURE SENSOR INDICATES A TEMPERATURE OF 2°F ABOVE

THE SUPPLY AIR SETPOINT, THE PDI LOOP SHALL ADD 1 TO THE FAN HEAT OFFSET

VALUE. IF THE FAN HEAT OFFSET VALUE IS GREATER THAN 5, THEN THE FAN HEAT

OFFSET SHALL BE SET TO 5. AFTER AN ADJUSTABLE PERIOD OF 15 MINUTES THE PID

LOOP SHALL COMPARE THE SUPPLY TEMPERATURE TO THE SETPOINT AND ADJUST

THE VALUE.

17. CONTINUOUS COMMISSIONING ALARMS

17.1 IF IN COOLING MODE (OUTSIDE AIR IS GREATER THAN 50 DEGREES):

TS-2 IS GREATER THAN TS-1 BY 1 DEG F, OR MORE, THEN ALARM "STEAM VALVE OPEN IN

COOLING MODE"

17.2 IF IN HEATING MODE (OUTSIDE AIR IS LESS THAN 50 DEGREES):

TS-3 IS LESS THAN TS-2 BY 1 DEG F, OR MORE, THEN ALARM "CHILLED WATER VALVE IS OPEN

IN HEATING MODE"

SEQUENCE OF OPERATION FOR AIR HANDLING UNIT (N-1-1)

NOT TO SCALE

AHU-N-1-1 POINTS LIST

INPUT INPUT DEVICE OUTPUT OUTPUT DEVICE

NUMBER TYPE NUMBER TYPE

1 DIGITAL SF1 VFD HAND OFF AUTO 1 DIGITAL SF1 VSMC ENABLE/DISABLE

2 DIGITAL RF1 VFD HAND OFF AUTO

3 DIGITAL SF1 STATUS CS

3 DIGITAL RF1 VSMC ENABLE/DISABLE4 DIGITAL RF1 STATUS CS

5 DIGITAL PRE-FILTER STATUS DP

5 DIGITAL DISCHARGE SMOKE DAMPER

6 DIGITAL FINAL FILTER STATUS DP

6 DIGITAL RETURN SMOKE DAMPER

7 DIGITAL FREEZESTAT

DIGITAL HUMIDIFIER ENABLE

8 DIGITAL HIGH DISCHARGE DUCT STATIC DP

DIGITAL SPARE

DIGITAL DISCHARGE DUCT SMOKE DETECTOR STATUS10

DIGITAL RETURN DUCT SMOKE DETECTOR STATUS11

DIGITAL DISCHARGE SMOKE DAMPER STATUS12

DIGITAL RETURN SMOKE DAMPER STATUS13

DIGITAL SF1 VFD FAULT14

DIGITAL RF1 VFD FAULT15

INPUT DEVICE

OUTPUT OUTPUT DEVICE

INPUT

NUMBER TYPE

NUMBER TYPE

1 ANALOG

SPARE

1 ANALOG SF1 VSMC SPEED REFERENCE

2 ANALOG

SPARE

2 ANALOG

3 ANALOG

SPARE

3 ANALOG

RF1 VSMC SPEED REFERENCE

4 ANALOG

DISCHARGE AIR TEMPERATURE

4 ANALOG

OUTSIDE AIR DAMPER

5 ANALOG

RETURN AIR TEMPERATURE

5 ANALOG

MIXED AIR DAMPER

6 ANALOG

MIXED AIR TEMPERATURE

6 ANALOG

EXHAUST AIR DAMPER

7 ANALOG

7 ANALOG

SPARE

8 ANALOG

RETURN AIR HUMIDITY

8 ANALOG

CHILLED WATER VALVE

9 ANALOG

DISCHARGE DUCT STATIC PRESSURE

PRE-HEAT VALVE

10 ANALOG

SUPPLY AIR FLOW MEASURING STATION

11 ANALOG

RETURN AIR FLOW MEASURING STATION

ANALOG

12 ANALOG

OUTDOOR AIR TEMPERATURE

ANALOG

SPARE

13 ANALOG

LEAVING PRE-HEAT COIL AIR TEMPERATURE

14 ANALOG

LEAVING COOLING COIL AIR TEMPERATURE

15 ANALOG

OUTSIDE AIRFLOW STATION

16 ANALOG

SUPPLY AIR HUMIDITY

SPARE

SPARE

DIGITAL LOW RETURN DUCT STATIC DP

DIGITAL SPARE

DIGITAL SPARE

ANALOG HUMIDIFIER

ANALOG SPARE

DIGITAL SPARE16

DIGITAL SPARE17

DIGITAL SPARE18

DIGITAL SPARE19

DIGITAL SPARE20

DIGITAL SPARE21

DIGITAL SPARE22

IN DIAGRAMS, 'I' INDICATES AN INPUT, 'O' INDICATES AN OUTPUT.

DAMPER OPERATORS TO BE PROVIDED BY TEMPERATURE CONTROLS CONTRACTOR.

TEMPERATURE CONTROL TEST SHALL INCLUDE, BUT NOT BE LIMITED TO:

· DAMPER OPERATION

· VALVE ACTUATION RESPONSE AND VALIDATION OF CORRECT OPERATION

· VERIFIED ENTIRE CONTROL SEQUENCE OPERATES PER DESIGN

· ACCOUNT FOR ALL CONTROL POINTS LISTED

ALL SYSTEMS SHALL BE COMMISSIONED. REFER TO SPECIFICATIONS FOR ADDITIONAL INFORMATION.

TEMPERATURE CONTROLS SHALL BE TRIDIUM. ALL CONTROLS WORK SHALL INTERFACE WITH EXISTING

TRIDIUM BUILDING CONTROL SYSTEM.

ALL REQUIRED POINTS MAY NOT BE LISTED ON POINTS LIST/DIAGRAM. ADDITIONAL POINTS MAY BE REQUIRED BASED ON FINAL EQUIPMENT SELECTION. CONTRACTOR SHALL PROVIDE ANY ADDITIONAL

CONTROLS POINTS REQUIRED.

REFERENCE SPECIFICATION SECTIONS 230923 AND 230940 FOR ADDITIONAL INFORMATION.

A.

B.

C.

D.

E.

F.

G.

TEMPERATURE CONTROLS GENERAL NOTES:

18. COLD START SEQUENCE

18.1 WHENEVER UNIT IS STARTED AND OUTDOOR AIR TEMPERATURE IS BELOW 30 DEG F INITIATE

THE FOLLOWING SEQUENCE.

18.2.1 OA DAMPER SHALL BE CLOSED. EXHAUST AIR DAMPER SHALL BE CLOSED, MIXED AIR DAMPER

SHALL BE 100% OPEN (ECONOMIZER DISABLED).

18.2.2 COMMAND ON STEAM PREHEAT VALVE.

18.2.3 STEAM PREHEAT VALVE SHALL MAINTAIN 80- DEGREE SUPPLY AIR TEMPERATURE.

18.2.4 SMOKE DAMPER SHALL BE OPEN.

18.2.5 COMMAND ON SUPPLY AND RETURN (DRIVE) ALLOW TO RAMP UP NORMALLY.

18.2.6 SET MIXED AIR SETPOINT TO 70 DEG F ONCE SUPPLY/RETURN FAN-ON STATUS HAS BEEN

PROVEN.

18.2.7 FIVE MINUTES AFTER SUPPLY/RETURN FAN-ON STATUS HAS BEEN PROVEN, OA DAMPER SHALL DELIVER 5% OF CFM RA AND EX DAMPERS SHOULD OPEN/CLOSE SIMULTANEOUSLY WITH OA DAMPER.

(OA=5% RA=95% EX=5%).

18.2.8 FIVE MINUTES AFTER OA DAMPER STARTED DELIVERING 5%, RELEASE OA, RA RELIEF AIR

DAMPERS TO CONTROL TO MEET MIXED AIR SETPOINT.

18.2.9 LOWER MIXED AIR SETPOINT TO 60 DEGREES F FOR 10 MINUTES.

18.2.10 RELEASE MIXED AIR SETPOINT BACK TO ORIGINAL SETTING.

Revisions: Date:

Addendum #1 09 SEP 2020