222_M-703_R1_AMENDMENT 010.pdf
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- Solicitation number
- N6247026R0012
About this file
This document is a mechanical control diagram for HVAC systems showing the control logic and sensor requirements for a Dedicated Outdoor Air System (DOAS-1) with energy recovery and typical Building Control Units (BCUs).
The DOAS-1 system operates in occupied, unoccupied, and dehumidification modes with specific sequence-of-operation requirements. In occupied mode, supply and exhaust fans run continuously while maintaining a 65°F supply air setpoint through modulating outside and exhaust air bypass dampers and a heating coil valve. The system includes a heat pump condensing unit (HPCU) for heating and cooling modes, with heating mode enabled when space temperature falls 5°F below setpoint and cooling mode enabled when it rises 5°F above setpoint. During dehumidification mode, when average relative humidity exceeds 60% RH, a DX cooling coil provides full cooling while the heating coil modulates to maintain supply air temperature. The unoccupied mode keeps fans off and dampers closed while the heating coil maintains 50°F. Safety features include freezestat protection that closes dampers and opens the heating coil valve during freeze conditions, smoke detector integration that shuts down the supply fan and closes dampers, and EAS shutdown capability. The typical BCU control diagram manages space temperature sensors, heating coil valves, supply fan status monitoring, and drain pan high-limit switches with alarm generation for fan operation failure or temperature deviation beyond ±5°F for more than 10 minutes. All sensor locations reference the mechanical piping plans, with adjustable setpoints throughout the system.
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Text version
SYSTEM POINT DESCRIPTION NOTES
DOAS-1 POINTS LIST
T R
E N
D L
O G
B
IN
A R
Y V
A R
IA
B
LE
A N
A
LO
G V
A R
IA
B
LE
A
LA
R M
B
IN
A R
Y O
U T
P U
T
B
IN
A R
Y
IN
P U
T
A N
A
LO
G O
U T
P U
T
A N
A
LO
G
IN
P U
T
G R
A P
H
IC
X
X
X
X
X
X
X
X
X
X
X
X
X
NOTES:
1. GENERATE ALARM IF FAN FAILS TO SHOW PROOF OF AIRFLOW.
2. GENERATE ALARM IF SUPPLY AIR TEMPERATURE FALLS BELOW 32°F (ADJUSTABLE).
3. GENERATE ALARM IF EXHAUST AIR TEMPERATURE FALLS BELOW 15°F (ADJUSTABLE).
4. GENERATE ALARM IF FREEZESTAT INDICATES A LOW TEMPERATURE CONDITION.
5. GENERATE ALARM IF SMOKE DETECTOR INDICATES AN ALARM CONDITION.
6. TYPICAL OF 3.
X
X
X
X
X
X
X
M
M M
M
FREEZESTAT AUTOMATIC RESET
RETURN AIR TEMPERATURE SENSOR
SUPPLY AIR TEMPERATURE SENSOR
LOW TEMPERATURE THERMOSTAT (FREEZESTAT, MANUAL RESET, 38°F)
LT
ENERGY RECOVERY WHEEL
OUTSIDE AIR
RELATIVE HUMIDITY
LOW TEMPERATURE THERMOSTAT (FREEZESTAT, AUTOMATIC RESET, 45°F)
LT
SA
RA
EXHAUST AIR DAMPER
OUTSIDE AIR
TEMPERATURE
OUTSIDE AIR
DAMPER
EXHAUST AIR
TEMPERATURE SENSOR
T
EA
OA
RH
FREEZESTAT MANUAL RESET
HPCU CONTROL SIGNAL
HEATING COIL VALVE
ENERGY RECOVERY WHEEL START/STOP
SEQUENCE OF OPERATION - ENERGY RECOVERY
THE DEDICATED OUTDOOR AIR SYSTEM (DOAS) SHALL OPERATE IN THE OCCUPIED MODE
WHENEVER AN ASSOCIATED ZONE IS OPERATING IN THE OCCUPIED MODE OR THE UN-OCCUPIED
OVERRIDE MODE; OTHERWISE THE DOAS SHALL BE IN THE UN-OCCUPIED MODE.
HEATING/COOLING MODES:
THE HEATING MODE SHALL BE ENABLED WHEN THE AVERAGE TEMPERATURE OF THE SPACES
SERVED FALLS 5F BELOW THE DOAS SUPPLY AIR SET POINT, AND THE COOLING MODE SHALL BE ENABLED WHEN THE AVERAGE TEMPERATURE RISES 5F ABOVE THE DOAS SUPPLY AIR SET POINT.
OCCUPIED MODE:
DURING THE OCCUPIED MODE THE SUPPLY AND EXHAUST FANS SHALL RUN CONTINUOUSLY AND
THE OUTSIDE AND EXHAUST AIR DAMPERS SHALL BE OPEN. WHENEVER THE OUTSIDE AIR
TEMPERATURE IS BELOW 35°F (ADJUSTABLE) THE OUTSIDE AIR BYPASS DAMPER SHALL MODULATE
TO MAINTAIN EXHAUST AIR TEMPERATURE AT 35F (ADJUSTABLE) FOR 5-MINUTES PER HOUR
(ADJUSTABLE), TO ALLOW THE DOAS TO DEFROST, OTHERWISE IT SHALL RUN CONTINUOUSLY. THE
ENERGY RECOVERY WHEEL SHALL RUN CONTINUOUSLY.
THE DOAS SUPPLY AIR SET POINT SHALL BE 65F (ADJUSTABLE).
DURING THE HEATING MODE THE HEAT PUMP CONDENSING UNIT (HPCU) SHALL PROVIDE HEAT. THE HPCU HEATING, ERV WHEEL BYPASS DAMPERS, AND THE HEATING COIL VALVE SHALL MODULATE
WITHOUT OVERLAP TO MAINTAIN THE DOAS SUPPLY AIR SET POINT.
DURING COOLING MODE THE HPCU SHALL PROVIDE COOLING. THE HPCU COOLING AND BYPASS
DAMPERS SHALL MODULATE WITHOUT OVERLAP TO MAINTAIN THE DOAS SUPPLY AIR SET POINT.
THE HEATING COIL VALVE SHALL REMAIN CLOSED DURING COOLING MODE.
OUTSIDE AIR BYPASS DAMPER AND EXHAUST AIR BYPASS DAMPER:
THE DAMPERS SHALL MODULATE IN UNISON TO MAINTAIN THE SUPPLY AIR TEMPERATURE.
IN HEATING MODE, IF THE DAMPERS ARE MORE THAN 50% OPEN (ADJUSTABLE) THE
WHEEL SHALL STOP.
DEHUMIDIFICATION MODE:
IF THE SPACE RELATIVE HUMIDITY SHALL BE DETERMINED BY THE AVERAGE OF THREE WALL-
MOUNTED RELATIVE HUMIDITY SENSORS IN THE SPACE. WHEN THE AVERAGE RELATIVE HUMIDITY LEVEL RISES ABOVE THE RH MAXIMUM SET POINT, 60%RH (ADJUSTABLE), DOAS-1 SHALL ENTER
DEHUMIDIFICATION MODE (DURING OCCUPIED AND UNOCCUPIED TIMES). DURING
DEHUMIDIFICATION MODE THE DX COIL SHALL PROVIDE FULL COOLING AND THE HEATING COIL SHALL MODULATE TO MAINTAIN THE SUPPLY AIR SET POINT. DOAS-1 DEHUMIDIFICATION MODE
SHALL END WHEN THE AVERAGE RH LEVEL FALLS 5%RH BELOW THE SET POINT.
UNOCCUPIED MODE:
DURING THE UN-OCCUPIED MODE THE EXHAUST AND SUPPLY FAN SHALL REMAIN OFF AND THE
OUTSIDE AND EXHAUST AIR DAMPERS SHALL REMAIN CLOSED. THE HEATING COIL CONTROL VALVE SHALL MODULATE TO MAINTAIN THE SUPPLY AIR TEMPERATURE SENSOR AT 50° F (ADJUSTABLE).
IF THE UN-OCCUPIED OVERRIDE BUTTON ON A ROOM SENSOR IS PRESSED THE DOAS SHALL
OPERATE AS LONG AS ANY ZONE IS OCCUPIED.
SAFETY - FREEZE STAT:
DURING A FREEZING CONDITION THE FANS SHALL REMAIN OFF, THE OUTSIDE AND THE EXHAUST AIR
DAMPERS SHALL REMAIN CLOSED, THE HEATING COIL CONTROL VALVE SHALL BE OPEN AND AN
ALARM SHALL BE GENERATED ON THE GRAPHICAL USER INTERFACE.
SAFETY - SMOKE DETECTOR/FIRE ALARM:
UPON ACTIVATION OF A SMOKE DETECTOR OR THE FIRE ALARM THE DOAS SHALL ENTER
UNOCCUPIED MODE AND SHALL REMAIN IN UNOCCUPIED MODE UNTIL THE ALARM IS CLEARED. THE
SMOKE DETECTOR SHALL BE HARD WIRED TO SHUT DOWN THE SUPPLY FAN AND CLOSE THE
OUTSIDE AND EXHAUST AIR DAMPERS.
SAFETY - EAS SHUTDOWN:
UPON ACTIVATION OF THE EAS SHUTDOWN THE DOAS FANS SHALL STOP AND THE OA & EA
DAMPERS SHALL REMAIN CLOSED.
OUTSIDE AIR TEMPERATURE
EXHAUST AIR TEMPERATURE
EXHAUST AIR DAMPER
OUTSIDE AIR DAMPER
OUTSIDE AIR RELATIVE HUMIDITY
RETURN AIR TEMPERATURE
SUPPLY AIR TEMPERATURE
EXHAUST FAN STATUS (CURRENT SENSOR)
EXHAUST FAN START/STOP
SUPPLY FAN STATUS (CURRENT SENSOR)
SUPPLY FAN START/STOP
HWR
HWS
PRESSURE INDEPENDENT HEATING COIL CONTROL VALVE
RL
RS
S S
SUPPLY AIR SMOKE DETECTOR
SD
SUPPLY AIR SMOKE DETECTOR
OUTSIDE AIR BYPASS DAMPER
EXHAUST AIR BYPASS DAMPER
SUPPLY FAN ALARM
EXHAUST FAN ALARM
ERV WHEEL EA BYPASS DAMPER
ERV WHEEL OA
BYPASS DAMPER
ERV WHEEL OA BYPASS DAMPER
ERV WHEEL EA BYPASS DAMPER
T
T
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X X
X
X
X X
X
X
X
X
X
X
X
X X
X X
X
X
X
X
X
X
T
DX COOLING COIL
RH
SUPPLY AIR RELATIVE HUMIDITY SENSOR
D X H
C
RH
RETURN AIR RELATIVE HUMIDITY SENSOR
RH
WALL-MOUNTED SPACE RELATIVE
HUMIDITY SENSOR (TYP 3)
XSPACE RELATIVE HUMIDITY SENSOR XX 6
XSUPPLY AIR RELATIVE HUMIDITY SENSOR XX
XRETURN AIR RELATIVE HUMIDITY SENSOR XX
ECM
CS
EXHAUST FAN STATUS
CURRENT SENSOR
ELECTRONICALLY
COMMUTATED
MOTOR CONTROLLER
EXHAUST FAN START/STOP
ECM
CS
SUPPLY FAN STATUS CURRENT SENSOR
ELECTRONICALLY COMMUTATED MOTOR CONTROLLER
SUPPLY FAN START/STOP
SUPPLY AIR
TEMPERATURE SENSOR
RA
T
ECM
SYSTEM POINT DESCRIPTION
NOTES
TYPICAL BCU POINTS LIST
T R
E N
D L
O G
B
IN
A R
Y V
A R
IA
B
LE
A N
A
LO
G V
A R
IA
B
LE
A
LA
R M
B
IN
A R
Y O
U T
P U
T
B
IN
A R
Y
IN
P U
T A
N A
LO
G
O U
T P
U T
A N
A
LO
G
IN
P U
T
G R
A P
H
IC
SPACE TEMPERATURE SENSOR
HEATING COIL CONTROL VALVE
SUPPLY AIR FAN STATUS (CURRENT SENSOR)
FAN START/STOP
FAN SPEED SIGNAL
DRAIN PAN HIGH LIMIT SWITCH
2,4,5,6
X X X X X
X X X
XXX
X X X
X X X X
X X
NOTES:
SEQUENCE OF OPERATIONS - BLOWER COIL UNITS
ZONE OCCUPANCY MODE:
A ZONE SHALL ENTER THE OCCUPIED MODE WHEN THE DOAS-1 SYSTEM IS IN THE
OCCUPIED MODE.
OCCUPIED MODE:
DURING THE OCCUPIED MODE THE SUPPLY FAN SHALL RUN CONTINUOUSLY. THE
OCCUPANT ADJUSTABLE SET POINT RANGE SHALL BE LIMITED BETWEEN 68°F AND 72°F
(ADJUSTABLE). THE HEATING SET POINT SHALL BE EQUAL TO THE OCCUPANT SET POINT
AND THE COOLING SET POINT SHALL BE 2°F ABOVE THE HEATING SET POINT.
THE SPACE COOLING TEMPERATURE FOR BCU-3 SHALL BE DETERMINED BY THE
AVERAGE OF THE THREE ROOM TEMPERATURE SENSORS ASSOCIATED WITH BCU-3. THE
COOLING SET POINT ASSOCIATED WITH THE TRAINING ROOM SHALL BE USED TO ENABLE
AND OPERATE BCU-3 COOLING. THE SPACE HEATING TEMPERATURE FOR BCU-3 SHALL
BE DETERMINED BY THE SPACE SET PONT IN THE TRAINING ROOM.
THE FAN SHALL RUN AT LOW SPEED WHENEVER THE ROOM TEMPERATURE IS LESS THAN
1°F BELOW THE HEATING SET POINT OR LESS THAN 1°F ABOVE THE COOLING SET POINT.
THE FAN SHALL RUN AT MEDIUM SPEED WHENEVER THE ROOM TEMPERATURE IS
BETWEEN 1°F AND 2°F BELOW THE HEATING SET POINT OR BETWEEN 1°F AND 2°F ABOVE
THE COOLING SET POINT.
THE FAN SHALL RUN AT HIGH SPEED WHENEVER THE ROOM TEMPERATURE IS MORE
THAN 2°F BELOW THE HEATING SET POINT OR MORE THAN 2°F ABOVE THE COOLING SET
POINT.
THE HEATING COIL VALVE SHALL MODULATE TO MAINTAIN THE ROOM HEATING SET
POINT. THE HEATING COIL VALVE SHALL BE FULLY OPEN WHENEVER THE ROOM
TEMPERATURE IS MORE THAN 3°F BELOW THE HEATING SET POINT, AND SHALL BE
CLOSED WHENEVER ROOM TEMPERATURE IS ABOVE THE HEATING SET POINT.
THE DX COOLING COIL SHALL CYCLE TO MAINTAIN THE ROOM COOLING SETPOINT. THE
HEATING CONTROL VALVE AND FINTUBE VALVES SHALL REMAIN CLOSED.
DEHUMIDIFICATION MODE:
IF THE SPACE RELATIVE HUMIDITY LEVEL RISES ABOVE THE RH MAXIMUM SET POINT, 60%
RH ADJUSTABLE), THE BCU SHALL ENTER DEHUMIDIFICATION MODE (DURING OCCUPIED
AND UNOCCUPIED TIMES). DURING DEHUMIDIFICATION MODE THE DX COOLING SHALL BE
ENABLED AND THE HEATING COIL SHALL MODULATE TO MAINTAIN THE SUPPLY AIR
TEMPERATURE ACCORDING TO THE FOLLOWING USER ADJUSTABLE REST SCHEDULE:
ROOM TEMPERATURE SUPPLY AIR SET POINT
2°F > ROOM SET POINT 55°F
2°F < ROOM SET POINT 95°F
UNOCCUPIED MODE:
DURING THE UN-OCCUPIED MODE THE FCU AND/OR BCU SHALL OPERATE IN NIGHT SET-
BACK MODE. DURING NIGHT SET-BACK MODE THE SUPPLY FAN SHALL BE OFF, THE
HEATING VALVE SHALL BE CLOSED UNLESS THE ROOM TEMPERATURE FALLS BELOW THE
NIGHT SET-BACK SET POINT (65°F, ADJUSTABLE). IF THE ROOM TEMPERATURE FALLS
BELOW THE NIGHT SET-BACK SET POINT THE FAN SHALL RUN AT HIGH SPEED AND THE
HEATING COIL VALVE SHALL REMAIN FULLY OPEN UNTIL NIGHT SET-BACK IS SATISFIED.
UNOCCUPIED OVERRIDE MODE:
WHEN THE OCCUPANT OVERRIDE BUTTON IS PRESSED DURING THE UNOCCUPIED MODE
THE FC/BC UNIT SHALL OPERATE AND THE ERV SHALL OPERATE IN THE OCCUPIED MODE
FOR 1 HOUR (ADJUSTABLE) AND THEN SYSTEMS SHALL RETURN TO THE UNOCCUPIED
MODE. WHEN THE DOAS-3 IS CHANGED TO THE OCCUPIED MODE BY A LOCAL OVERRIDE
SWITCH, ONLY THE OCCUPIED LOCAL ZONE SHALL ENTER THE OCCUPIED MODE; THE
REMAINING LOCAL ZONES WILL REMAIN IN THE UNOCCUPIED MODE.
SAFETY - DRAIN PAN HIGH LIMIT:
THE CONDENSATE PAN FLOAT SWITCH SHALL STOP FAN, CLOSE COOLING COIL CONTROL
VALVE, AND SIGNAL ALARM WHEN A HIGH WATER LEVEL IS PRESENT IN THE PAN.
STAGGERED START:
WHEN SWITCHING FROM UNOCCUPIED TO OCCUPIED MODE, EACH FAN SHALL START
AFTER A RANDOMLY GENERATED NUMBER OF SECONDS TO AVOID EXCESSIVE SYSTEM
CURRENT DRAW.
XD
GENERATE ALARM AT GUI IF FAN FAILS TO SHOW PROOF OF OPERATION.
GENERATE ALARM AT GUI IF THE ROOM TEMP. IS NOT WITHIN +/- 5°F OF SET POINT FOR
MORE THAN 10 MINUTES.
GENERATE ALARM AT GUI IF THE DRAIN PAN FLOAT SWITCH INDICATES THE PRESENCE
OF WATER.
REFER TO MECHANICAL PIPING PLANS FOR SENSOR LOCATIONS.
ROOM TEMPERATE SENSORS SHALL INCLUDE NIGHT-SETBACK OVERRIDE BUTTON.
TYPICAL OF 3 FOR BCU-3, AND 1 EACH FOR BCU-1 AND BCU-2.
TYPICAL OF 3 FOR BCU-3 ONLY.
FILTER
SUPPLY AIR TEMPERATURE X X X
RL
RS
C
H
NIGHT SETBACK TEMPERATURE
X X
X X X
X
X
CS
DRAIN PAN HIGH
LIMIT FLOAT SWITCH
PRESSURE INDEPENDENT
HEATING COIL CONTROL VALVE
FAN STATUS
CURRENT SENSOR
VARIABLE SPEED
ELECTRONICALLY
COMMUTATED (EC)
MOTOR CONTROLLER
FAN START/STOP
HWS
HWR
RH
WALL-MOUNTED SPACE
RELATIVE HUMIDITY SENSOR
T
WALL-MOUNTED SPACE
TEMPERATURE SENSOR
SA
FINTUBE
CONTROL VALVE
1.
2.
3.
4.
5.
6.
7.
SPACE RELATIVE HUMIDITY SENSOR X X X
FINTUBE CONTROL VALVE XXX 7
SATISFACTORY TO DATE
APPROVED
FOR COMMANDER NAVFAC
SEAL
A
B
C
D
1 2 3 4 5
1 2 3 4 5
A
B
C
D
SHEET
NAVFAC DRAWING NO.
DESIGNER
DRAWN BY
CHECKED BY
OF
EPROJECT NO.:
D E
P A
R T
M E
N T
O F
T H
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A V
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A C
IL
IT
IE
S
E N
G
IN
E E
R
IN
G S
Y S
T E
M S
C O
M M
A N
D
DRAWFORM REVISION: 14 SEP 2023
DESIGN MANAGER
PROJECT MANAGER
FEAD/PM&E
FIRE PROTECTION
N A
V A
L F
A C
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IN
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IN
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UNCLASSIFIED
UNCLASSIFIED
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SCALE: NOT TO SCALE
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DOAS-1 ENERGY RECOVERY VENTILATOR CONTROL DIAGRAM
SCALE: NOT TO SCALE
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TYPICAL BCU CONTROL DIAGRAM
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