S02. 36C25019B0060_3 Addendum 02 M0.10 - Mechanical Controls R01A02.pdf

Hardware Points Software Points

Point Name AI AO BI BO Trend Alarm Show On Graphic

Zone Temp X X X

Zone Current X X X

Heating Setpoint X X

Heating Percentage

Totals 3 0 0 1 4 3 3

Total Hardware 4

Loss of Power

Low Zone Temp

Low Current X

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X X

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Project Number

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Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Louis Stokes Cleveland

VA Medical Center

U.S. Department of Veterans Affairs

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Phase

ARCHITECT/ENGINEER OF RECORD

MEPT ENGINEER:

STAMPCONSULTANT

321 4 5 6 7 8 9 10

STRUCTURAL ENGINEER:

REPLACEMENT OF

AHU-17 & AHU-18

VAMC - WADE PARK

BARBER & HOFFMAN, INC.

2217 EAST 9TH STREET, SUITE 350

CLEVELAND, OH 4115-1257

PHONE: (216)-875-0100

FREDRICK, FREDRICK & HELLER

ENGINEERS, INC.

672 EAST ROYALTON ROAD

BROADVIEW HTS., OHIO 44147

PHONE: (440)-546-9696

541-18-104

19002

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M0.10

MECHANICAL CONTROLS

JXCDAD08/09/2019

FLOW METER CONTROLS POINT LIST

NOT TO SCALE

TEMPERATURE PROBE

FLOW METER TRANSDUCERS

TEMPERATURE PROBE

FLOW

METER

TRANSMITTER

RS232 RS485

OUTPUTS INPUTS

P O

W E

R S

U P

P L Y

CHWS

CHWR

FLOW METER CONTROLS AND SEQUENCE OF OPERATION

OUTDOOR AIR FAN CONTROLS POINT LIST

I - STATIC PRESSURE

I - DAMPER STATUS

O - INLET DAMPER

M

N.C.

THE BALANCER SHALL ADJUST AND SET THE VFD TO THE SCHEDULED AIR FLOW SETPOINT.4.

GENERATED.

THE BUILDING CONTROL SYSTEM SHALL MONITOR THE FAN STATUS. UPON FAILURE OF THE FAN, AN ALARM SHALL BE3.

START. UPON FAN FAILURE OR SHUTDOWN DAMPER SHALL CLOSE.

ON A RUN COMMAND THE TWO POSITION DAMPER SHALL OPEN, AND THE DAMPER END SWITCH SHALL ALLOW THE FAN TO2.

FAN SHALL OPERATE CONTINUOUSLY.1.

FAN OPERATION

O - SUPPLY FAN VFD SPEED

O - SUPPLY FAN ENABLE/DISABLE

VFD

I - FAN STATUS

CT

M

I - OUTDOOR AIR FAN VFD HOA

OA

SP

SEQUENCE OF OPERATION FOR OUTDOOR AIR FAN

NOT TO SCALE

Hardware Points Software Points

Point Name AI AO BI BO Trend Alarm Show On Graphic

Fan VFD Speed X X X

Fan VFD Fault X X

Fan Status X

Fan Start/Stop X X

Total Hardware 6

Isolation Damper X X

Exhaust Duct Static Pressure X X X

Fan Failure

Fan in Hand X

Totals 1 1 2 2 4 4 6

X

X

X

X

X

X

Hardware Points Software Points

Point Name AI AO BI BO Trend Alarm Show On Graphic

Water Flow Rate (Chilled Water Return) X X X

Water Temperature (Chilled Water Supply) X X

Water Temperature (Chilled Water Return)

Totals 3 2 0 0 9 1 9

Total Hardware 5

Data Outputs

Peak Flow Today

Meter Failure X

X

X

X X

BTU Measurement Outputs X

X

X

X

XX

X

XPeak Flow Year to Date

X

XCHW Usage Month to Date

CHW Usage Year to Date

RETURN AIR TEMP - MIXED AIR TEMP

RETURN AIR TEMP - OUTSIDE AIR TEMP

%OA= X 100

7. RETURN FAN(S)

7.1 THE RETURN FAN ISOLATION DAMPER SHALL OPEN AND THE RETURN FAN SHALL

RUN WHENEVER THE SUPPLY FAN RUNS. MULTIPLE

FANS SHALL RUN IN UNISON. IF A FAN SHOULD FAIL, ITS ASSOCIATED

ISOLATION DAMPER SHALL CLOSE AND REMAINING FANS SHALL RAMP UP TO

MAINTAIN SET POINT.

7.2 ALARMS

RETURN FAN FAILURE AND INDICATE WHICH FAN FAILED

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 (4800 CFM). 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 AND BYPASS DAMPER TO

MAINTAIN ITS 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 (TS-1) DROPS BELOW 36 DEG F (ADJ.)

OR THE FREEZESTAT IS ON.

9.4 IF OUTDOOR TEMPERATURE IS BELOW 30 DEG F (ADJ) AND HEAT IS

REQUIRED, THEN THE STEAM VALVE FOR HEATING SHALL BE FULLY OPEN

AND TEMPERATURE CONTROL SHALL BE BY MODULATION OF THE

FACE/BYPASS DAMPER.

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, THE SETPOINT SHALL INCREMENTALLY

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

AS COOLING DEMAND DECREASES, 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

11.5.1 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.

11.5.2 LOW SUPPLY AIR TEMPERATURE ALARM, THE CONTROLLER SHALL

ALARM IF THE SUPPLY AIR TEMPERATURE IS LESS THAN 45 DEG F(ADJ.).

12. ECONOMIZER

12.1 THE CONTROLLER SHALL MEASURE THE MIXED AIR TEMPERATURE AND

MODULATE THE ECONOMIZER DAMPERS IN SEQUENCE TO MAINTAIN THE

ECONOMIZER TEMPERATURE SETPOINT. THE ECONOMIZER TEMPERATURE

SETPOINT IS EQUAL TO THE SUPPLY AIR TEMPERATURE SETPOINT

MINUS THE FAN HEAT OFFSET VALUE. THE OUTSIDE AIR DAMPERS 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 RETURN

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 40% 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 MINIMUM 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 ECONOMIZER

DAMPER SHALL CLOSE AND OUTSIDE AIR DAMPER SHALL OPEN. MINIMUM

OUTDOOR AIR FAN SHALL OPERATE TO MAINTAIN MINIMUM OUTDOOR

AIR SET POINT.

14.2.2 WHEN THE AIR HANDLING UNIT CONTROLS ARE OPERATING IN

ECONOMIZER MODE, THE ECONOMIZER CONTROL SEQUENCE WILL

MODULATE THE ECONOMIZER DAMPER, WHILE THE OUTSIDE

AIR DAMPER MAINTAINS MINIMUM OUTDOOR AIR POSITION

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 METER SHALL

MEASURE THE OUTSIDE AIR FLOW. 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

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

FILTER

15.1.2. 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 PID 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 PID 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 PID 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"

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 (MIN OA FAN SHALL BE OFF), RELIEF AIR

DAMPER SHALL BE CLOSED, RETURN 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 FAN 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 FAN STARTED DELIVERING 5%, RELEASE OA, RA,

RELIEF AIR DAMPERS TO CONTROL TO MEET MIXED AIR SETPOINT.

18.2.9 LOWER MIXED SET POINT TO 60 DEGREES FOR 10 MINUTES.

18.2.10 RELEASE MIXED AIR SET POINT BACK TO ORIGINAL SETTING.

19. MINIMUM OUTDOOR AIR FAN

19.1 THE OUTDOOR AIR FAN SHALL RUN WHENEVER ECONOMIZER IS

DISABLED. WHEN ECONOMIZER IS ENABLED MINIMUM OUTDOOR AIR FAN

SHALL SHUTDOWN AND OUTDOOR AIR DAMPER SHALL CLOSE.

19.2 ALARMS

HIGH OUTDOOR AIR AIRFLOW (10% ABOVE OUTDOOR AIRFLOW)

LOW OUTDOOR AIR AIRFLOW (30% BELOW OUTDOOR AIRFLOW)

1. RUN CONDITIONS - SCHEDULED

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

2. FREEZE PROTECTION

2.1 WHEN THE FREEZE STAT SENSES A TEMPERATURE BELOW 40 DEG. F THE

FOLLOWING SEQUENCE SHALL OCCUR:

2.1.1 THE UNIT SHALL SHUTDOWN AND GENERATE AN ALARM

2.1.2 THE OUTSIDE AIR AND ECONOMIZER DAMPERS SHALL CLOSE

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

2.1.4 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 ISOLATION DAMPER SHALL OPEN AND THE SUPPLY FAN SHALL

RUN ANYTIME THE UNIT IS COMMANDED TO RUN,

UNLESS SHUTDOWN ON SAFETIES. TO PREVENT SHORT CYCLING, THE

SUPPLY FAN SHALL HAVE A USER DEFINABLE (ADJ.) MINIMUM RUNTIME.

MULTIPLE FANS SHALL RUN IN UNISON. IF A FAN SHOULD FAIL, ITS

ASSOCIATED ISOLATION DAMPER SHALL CLOSE AND REMAINING FANS SHALL

RAMP-UP TO MAINTAIN SET POINT.

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 AND SHALL NOT BE SET LOWER THAN 0.5".

6.2 ALARMS:

HIGH SUPPLY FAN STATIC PRESSURE

LOW SUPPLY FAN STATIC PRESSURE

SUPPLY FAN VFD FAULT

SEQUENCE OF OPERATION FOR AIR HANDLING UNIT

UNIT HEATER SEQUENCE OF OPERATIONS

T

UNIT HEATER

LPR

LPS

HEATER OPERATION:

A. REMOTE THERMOSTAT SHALL SEQUENCE FAN

AND COIL TO MAINTAIN SETPOINT (65°F).

B. BMS SHALL GENERATE AN ALARM IF STAT TEMPERATURE

FALLS BELOW 38 DEGREES (ADJUSTABLE)

NOT TO SCALE

UNIT HEATER CONTROLS POINT LIST

Hardware Points Software Points

Point Name AI AO BI BO Trend Alarm Show On Graphic

Unit Heater Steam Valve X X X

Low Space Temperature X X

Total Hardware 2

Totals 0 1 0 0 2 1 3

Space Temperature X X

HEAT TRACE CONTROL PANEL SEQUENCE

PACKAGED CONTROL PANEL SHALL BE PROVIDED WITH THE FOLLOWING:

A. EACH HEAT TRACE CIRCUIT SHALL BE PROVIDED WITH 30mA GFCI CIRCUIT BREAKER

B. ALARM ACTIVATION FOR EACH CIRCUIT

1. LOSS OF POWER

2. LOW TEMPERATURE

3. LOW CURRENT

C. DRY CONTACTS FOR B.A.S. TERMINATION

FROM ELECTRICAL PANEL

208/120V-3PHASE

TO B.A.S.

TO HEAT TRACE JUNCTION

BOX FOR EACH PIPE (TYP) HEAT TRACE

CONTROL PANEL

NOT TO SCALE

HEAT TRACE PANEL CONTROLS POINT LIST

T T

AMBIENT TEMPERATURE

SENSOR

PROVIDE PIPE TEMPERATURE

SENSORS FOR CHWS, CHWR,

LPR, LPS & CD

Revisions: Date:

BID ISSUE 08/09/2019

AMENDMENT 2 05/29/2020

TIED INTO BMS

NEW DDC

THERMOSTAT 4. SENSOR FAILURE

SEQUENCE OF OPERATIONS - CHWR, CHWS & CD

HEAT TRACE SHALL BE ENABLED WHEN OUTDOOR AIR TEMPERATURE FALLS BELOW 37°F (ADJ.).

HEAT TRACE SHALL BE DISABLED WHEN OUTDOOR AIR TEMPERATURE IS ABOVE 40°F (ADJ.).

SEQUENCE OF OPERATIONS - LPS & LPC

THE HEAT TRACE SYSTEM SHALL BE CONTROLLED BY A LINE SENSING THERMOSTAT

THAT SHALL CALL FOR THE SYSTEM TO OPERATE WHEN THE PIPE TEMPERATURE

FALLS BELOW 37°F (ADJ.). PIPE SENSING THERMOSTAT SHALL BE PROVIDED FOR EACH CIRCUIT, UPON DETECTION OF TEMPERATURE OF 32°F LOW TEMPERATURE ALARM SHALL SIGNAL TO

B.A.S.

ON ANY ALARM CONDITION B.A.S. SHALL ANNUNCIATE "TROUBLE" ALARM WITH ALARM

DESCRIPTION AS SHOWN ABOVE.

PROVIDE INDIVIDUAL HEAT TRACING CIRCUIT FOR CHWS, CHWR, LPR, LPS AND CD.

LPS AND LPR HEAT TRACE CABLE SHALL BE RATED FOR MAXIMUM CONTINUOUS EXPOSURE

TEMPERATURE OF 420°F.

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