Typical Wiring Diagram
Following is an example of a typical wiring diagram located in the unit control center. This wiring diagram includes a legend highlighting which accessories were provided with the unit. Factory wiring and field wiring are also indicated. This particular example includes 1) variable frequency drives on the blowers requiring a modulating input, 2) modulating energy recovery wheel with factory controls for economizer, 3) energy recovery wheel rotation sensor, 4) outdoor air and exhaust air dirty filter switches, 5) motorized outdoor air and exhaust air intake dampers, and 6) timed exhaust frost control. Many other factory installed and wired accessories are available.
DS1
L1
MAIN POWER |
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GROUND |
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R
S1
G
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FU5
TR1
C
D1 | EXHAUST DAMPER |
LEGEND
CC COMPRESSOR CONTACTOR
CF CONDENSING FAN CONTACTOR
CH COMPRESSOR SUMP HEATER
*D DAMPER
DB POWER DISTRIBUTION BLOCK DL DAMPER LIMIT SWITCH
*DS DISCONNECT SWITCH
*EC ECONOMIZER CONTROLLER
FCS CONDENSOR FAN CYCLE SWITCH FU FUSES
*FU5 CONTROL TRANSFORMER FUSES (NOT ON CLASS II) FZ1 FREEZE PROTECTION
HPS HIGH PRESSURE SWITCH (MANUAL RESET) LPS LOW PRESSURE SWITCH
*PS1 WHEEL FROST PRESSURE SWITCH
*PS2 SUPPLY DIRTY FILTER PRESSURE SWITCH
*PS3 EXHAUST DIRTY FILTER PRESSURE SWITCH
*R1 ENERGY WHEEL RELAY/CONTACTOR
R2 OCCUPIED/UNOCCUPIED RELAY
*R3 EXHAUST BLOWER VFD RELAY
*R4 SUPPLY BLOWER VFD RELAY
R5 MODULATING WHEEL FROST CONTROL RELAY
R6 ECONOMIZER RELAY
R7 COMPRESSOR INTERLOCK RELAY
R8 EVAP RELAY (INDIRECT)
R9 EVAP RELAY (DIRECT)
R10 UNIT RELAY
o S1 FAN SWITCH
*S2 ROTATION SENSOR REED SWITCH
S3 ROTATION SENSOR REED SWITCH
S4 CALL FOR HEAT SWITCH
S5 BYPASS SWITCH
oS6 CALL FOR COOL SWITCH (FIRST STAGE)
S7 CALL FOR COOL SWITCH (SECOND STAGE)
*ST MOTOR STARTER
*T1 FROST CONTROL TIMER
TYPICAL SETTINGS t1(OFF) = 5 MIN., t2(ON) = 30 MIN.
* T2 | ROTATION SENSOR TIMER |
T3 | ROTATION SENSOR TIMER |
T4 | ECONOMIZER WHEEL JOG TIMER |
| TYPICAL SETTINGS t1(OFF) = 3 HRS., t2(ON) = 10 SEC. |
R3T1
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| R3 | EXHAUST FAN |
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| 4 | D2 | SUPPLY DAMPER |
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| R4 | SUPPLY FAN |
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| R1 | ENERGY WHEEL |
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| MA | TO MA AND MC | A2 | A1 | ||
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S2 | 1 | C |
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| ROTATION SENSOR |
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T5 | EVAP DELAY OFF TIMER |
T6 | COMPRESSOR MINIMUM OFF TIMER (TYP. 3 MIN.) |
T7 | COMPRESSOR MINIMUM OFF TIMER (TYP. 3 MIN.) |
* TR | TRANSFORMER |
* TS1 FROST CONTROL THERMOSTAT (JUMPER - HEAT) | |
| CLOSES ON TEMP. DECREASE TYPICAL SETTING 5º F. |
TS2 ECONOMIZER LOW LIMIT THERMOSTAT (JUMPER - HEAT) OPENS ON TEMP. DECREASE TYP. SETTING 20º OFFSET OR 50ºF.
TS3 ECONOMIZER UPPER LIMIT THERMOSTAT (JUMPER - HEAT) CLOSES ON TEMP. DECREASE TYP. SETTING 65º F./2º DIFF.
TS4 ROOM OVERRIDE SENSOR
TS5 INLET AIR POST HEATER LOCKOUT THERMOSTAT (AFTER WHEEL) CLOSES ON TEMP. DECREASE TYPICAL SETTING 65º F.
TS6 INLET AIR COMPRESSOR LOCKOUT THERMOSTAT
OPENS ON TEMP. DECREASE TYPICAL SETTING 60º F./2º DIFF.
*FACTORY SUPPLIED AND WIRED
o FIELD WIRED
S6
Y1
620 OHM RESISTOR OR RETURN AIR SENSOR
OUTDOOR AIR
SENSOR
MIXED AIR
SENSOR
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| 24 VAC | SENSOR | COM | THERMOSTAT CONTROLLER(S) |
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| THERMOSTAT(S) TS1, |
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PS1 |
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| 6 | T1 |
| FROST CONTROL |
NO C |
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TR | TR1 |
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| ECONOMIZER CONTROL |
1 | EC |
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+ | FR |
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SR |
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| ON |
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- | FC |
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SR+ |
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SO |
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SO+ | 5 |
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T2
T1
FIELD CONTROL WIRING RESISTANCE SHOULD NOT EXCEED 0.75 OHM. IF RESISTANCE EXCEEDS 0.75 OHM THEN CONSULT FACTORY. USE 14 GAUGE MINIMUM WIRE THICKNESS FOR CONTROL WIRING.
REPLACEMENT FUSES: MUST HAVE A MINIMUM I.R. RATING OF 5 KA
CAUTION:
UNIT SHALL BE GROUND IN ACCORDANCE WITH N.E.C.
POWER MUST BE OFF WHILE SERVICING.
USER INTERFACE CONNECTIONS:
USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.
DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.
PS2 | NC | C | NO | |
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FILTER SWITCH |
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C
34
PS3
EXHAUST DIRTYNCCNO R
FILTER SWITCH
C
FROST CONTROL INDICATOR
6
C
ROTATION INDICATOR
12 
C
