Additional Tunnel Heating-M-2.pdf

AREA OF DEMOLITION

REFER TO DWG M-1

STEAM TUNNEL PARTIAL PLAN42-MAU-001 ABOVE

TO CUP

42-T-UH-001

9FT AFF 42-T-UH-003

9FT AFF

T

T

T42-T-UH-002

9FT AFF

T

42-MAU-001

THERMOSTAT

ELECT PANEL HVD1

MCCM-2E

ELECT PANEL LP1

HVD1

ELECT PANEL LP2

HVD1

ELECT PANEL LP3

HVD1

REMOVE EXIST 5KW

UNIT HEATER AND TURN

OVER TO NIST.

S

02/C0 SENSOR

S

02/C0 SENSOR

NOTES:

1. COORDINATE WITH NIST LOCATIONS OF ALL NEW SENSORS

2. REMOVE AND REPLACE 3 SPACE TEMP SENSORS, COORDINATE WITH NIST SENSORSS TO BE REPLACED.

OA

S

BO - Outside Air Damper

BI - Outside Air Damper Status

T

AI - Zone Temp

M

Starter

CT

BO - Supply Fan Start/Stop

T

AI - Discharge Air Temp

BI - Freezestat

Gas

T

N.C.

OA DAMPER STATUS

GAS

MODULATING

25:1 TURNDOWN

OA DAMPER FREEZE STAT

SA TEMP

ZONE TEMP

VFD

SUPPLY FAN STATUS

FAN START/STOP

VFD SPEED

VFD FAULT

MAKE UP AIR UNIT CONTROL SEQUENCE

THE UNIT SHALL BE PROVIDED FROM THE FACTORY WITH:

24VAC TRANSFORMER

FACTORY MOUNTED AND WIRED OUTDOOR AIR INLET DAMPER WITH

ACTUATOR

MICROPROCESSOR CONTROLLER

THE MICROPROCESSOR CONTROL SHALL BE FACTORY

PROGRAMMED, MOUNTED, WIRED AND TESTED. CONTROLLER SHALL

HAVE A

LIGHTED LCD DISPLAY AND KEYPAD FOR CHANGING SET POINTS AND

MONITORING UNIT OPERATION. THE CONTROLLER SHALL BE

EQUIPPED WITH THE FOLLOWING SENSORS:

OUTDOOR AIR TEMPERATURE SENSOR

SUPPLY DISCHARGE TEMPERATURE SENSOR

BUILDING MANAGEMENT SYSTEM (BMS) COMMUNICATION

THE MICROPROCESSOR CONTROLLER SHALL BE CAPABLE OF

INTEGRATING INTO A BUILDING MANAGEMENT SYSTEM (BMS) TO

ALLOW THE BMS TO REMOTELY ADJUST SET POINTS, VIEW UNIT

STATUS POINTS AND ALARMS. THE MICROPROCESSOR SHALL

INCLUDE THE ABILITY TO COMMUNICATE OVER BACnet MSTP

SUPPLY FAN SEQUENCE

THE UNIT HAS BEEN PROVIDED WITH A FACTORY MOUNTED VARIABLE

FREQUENCY DRIVE (VFD). THE VARIABLE FREQUENCY DRIVESHALL

CONTROL THE SUPPLY FAN SPEED AS INDICATED BY THE FOLLOWING

SEQUENCE:

CONSTANT VOLUME:

TUNNEL ENCLOSURE DAMPERS SHALL BE COMMANDED OPEN, PROVE

OPEN STATUS VIA FEEDBACK BEFORE MAU IS ENABLED.

SUPPLY FAN SHALL BE LOCKED-OUT UNTIL ANY 2 (ADJ.) OF THE 6

TUNNEL ENCLOSURE DAMPERS HAVE PROVEN OPEN VIA FEEDBACK

SIGNAL

THE VFD SHALL BE PROGRAMMED FROM THE FACTORY FOR A

CONSTANT SUPPLY FAN SPEED. THIS IS TO BE ADJUSTED FOR AIR

BALANCING ONLY AND IS NOT TO BE MODULATED.

IF MAU FAILS, LOCKOUT AND CLOSE TUNNEL ENCLOSURE DAMPERS.

HEATING CONTROL

THE HEATING WILL BE LOCKED OUT WHEN THE OUTSIDE AIR IS ABOVE

THE HEATING LOCKOUT SET POINT (65 F ADJ.). WHEN ENABLED

DIRECT GAS FIRED HEATING

THE MICROPROCESSOR CONTROLLER WILL MODULATE THE DIRECT

GAS BURNER TO MAINTAIN THE ACTIVE SUPPLY TEMPERATURE

SETPOINT.

SUPPLY TEMPERATURE SET POINT CONTROL

THE ACTIVE SUPPLY TEMPERATURE SET POINT SHALL BE ADJUSTED

REMOTELY BY THE BMS.

MAKE UP AIR UNIT CONTROL SEQUENCE

SUPPLY FAN OFF

FACTORY MOUNTED AND WIRED OUTDOOR AIR INLET DAMPER

ACTUATOR IS DE-ENERGIZED AND SPRING RETURNS TO THE CLOSED

POSITION.

SUPPLY FAN ON

FACTORY MOUNTED AND WIRED OUTDOOR AIR INLET DAMPER

ACTUATOR IS ENERGIZED TO THE FULLY OPEN POSITION

SUPPLY AIR LOW LIMIT

IF THE SUPPLY AIR TEMPERATURE DROPS BELOW 35 F (ADJ.) FOR 300

SECONDS (ADJ.), THE CONTROLLER WILL DE-ENERGIZE THE UNIT AND

GENERATE AN ALARM.

ALARM MANAGEMENT

THE MICROPROCESSOR CONTROLLER WILL MONITOR THE UNIT

STATUS FOR ALARM CONDITIONS. UPON DETECTING AN ALARM, THE

CONTROLLER WILL RECORD THE ALARM DESCRIPTION, TIME, DATE,

AVAILABLE TEMPERATURES, AND UNIT STATUS FOR USER REVIEW. A

DIGITAL OUTPUT IS RESERVED FOR REMOTE ALARM INDICATION.

ALARMS ARE ALSO COMMUNICATED TO THE BUILDING MANAGEMENT

SYSTEM (BMS).

SUPPLY AIR DISCHARGE TEMPERATURE SENSOR ALARM

FAILURE OF THE SUPPLY AIR DISCHARGE TEMPERATURE SENSOR.

UNIT IS SHUT DOWN.

SUPPLY AIR LOW LIMIT ALARM

SUPPLY AIR HAS FALLEN BELOW 35 F (ADJ.) FOR 300 SECONDS (ADJ.).

UNIT IS SHUT DOWN.

DIRTY FILTER ALARM

INDICATES THE PRESSURE ACROSS THE FILTERS HAS INCREASED

ABOVE THE DIRTY FILTER PRESSURE SWITCH SETTING

(FIELDADJUSTABLE)

DIRECT GAS BURNER ALARM

INDICATES AN IGNITION CONTROLLER FLAME FAILURE ALARM.

REQUIRES MANUAL RESET AT THE UNIT.

SUPPLY FAN ALARM

INDICATES THE SUPPLY FAN FAILED TO PROVE FOR A 30 SECOND

(ADJ.) PERIOD.

DA

T

M

Elec

BO - Heating Stage 2

BO - Fan Start/Stop

ZONE TEMP

ELEC

HEAT STAGE 1

HEAT STAGE 2

FAN START/STOP

RUN CONDITIONS:

UNIT HEATER CONTROLS SHALL BE AN EXTENSION OF THE JCI CONTROL

SYSTEM.

THE UNIT SHALL RUN TO MAINTAIN A SPACE TEMPERATURE SETPOINT OF

45°F (ADJ.).

FAN:

THE FAN SHALL RUN ANYTIME THE ZONE TEMPERATURE DROPS BELOW

HEATING SETPOINT, UNLESS SHUTDOWN ON SAFETIES.

ELECTRIC HEATING STAGES:

THE CONTROLLER SHALL MEASURE THE ZONE TEMPERATURE AND STAGE

THE HEATING TO MAINTAIN ITS HEATING SETPOINT. TO PREVENT SHORT

CYCLING, THERE SHALL BE A USER DEFINABLE (ADJ.) DELAY BETWEEN

STAGES, AND EACH STAGE SHALL HAVE A USER DEFINABLE

(ADJ.) MINIMUM RUNTIME.

BAS:

PROVE FAN STATUS

PROVIDE FAN STATUS MISMATCH ALARM

UNIT HEATER STATE ALARM

ELECTRIC UNIT HEATER CONTROL SEQUENCE

T

O2/CO2 -

CARBON DIOXIDE (CO2) CONCENTRATION MONITORING:

THE CONTROLLER SHALL MEASURE THE ZONE CO2 CONCENTRATION.

ALARMS SHALL BE PROVIDED AS FOLLOWS:

• HIGH ZONE CARBON DIOXIDE CONCENTRATION: IF THE ZONE

CO2 CONCENTRATION IS GREATER THAN 900PPM (ADJ.) WHEN

IN THE OCCUPIED MODE.

TUNNEL CARBON DIOXIDE (CO2) CONCENTRATION MONITORING

SHEET NUMBER

PROJECT NAME of

325 BROADWAY BOULDER, COLORADO 80305-3328

NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY

DATEDESIGN APPROVAL

BOULDER DESIGN AND CONSTRUCTION DIVISION

DATESUPV.BYDESCRIPTIONREVISION

3 DRAFTING

ADDITIONAL TUNNEL HEAT

COOK

BUILDING 42 TUNNEL VENTILATION

3/10/2026

M-2COOK

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