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22
FACTORY SUPPLIED AND WIRED
G
MULTI-VOLTAGE PRIMARY
24 SECONDARY
TR1
C
FU5
TO UNIT
MAIN POWER
L3
L2
L1
DS1
SUPPLY DAMPER
D2
ENERGY WHEEL
R1
R
TR1
SO
SR
3
FR
FC
2-10V
-
+
1
TR
5
4
2
SR+
RETURN AIR SENSOR
MIXED AIR
SENSOR
T
T1
620 OHM RESISTOR OR
OUTDOOR AIR
SENSOR
SO+
4
S1
VFD-W
L3
3
4
SC
L2
L1
MC
T3
MA
T2
T1
PS1
NO CCOM NO
TS1
6
FROST CONTROL
A1
T1
A2
B1
16
15
T1
ENERGY WHEEL
S1
R1
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
S1 FAN SWITCH
S2 ROTATION SENSOR REED SWITCH
S3 ROTATION SENSOR REED SWITCH
S4 CALL FOR HEAT SWITCH
S5 BYPASS SWITCH
S6 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.
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 5
º
F.
TS2 ECONOMIZER LOW LIMIT THERMOSTAT (JUMPER - HEAT )
OPENS ON TEMP. DECREASE TYP. SETTING 20
º
OFFSET OR 50
º
F.
TS3 ECONOMIZER UPPER LIMIT THERMOSTAT (JUMPER - HEAT)
CLOSES ON TEMP. DECREASE TYP. SETTING 65
º
F./2
º
DIFF.
TS4 ROOM OVERRIDE SENSOR
TS5 INLET AIR POST HEATER LOCKOUT THERMOSTAT (AFTER WHEEL)
CLOSES ON TEMP. DECREASE TYPICAL SETTING 65
º
F.
TS6 INLET AIR COMPRESSOR LOCKOUT THERMOSTAT (JUMPER-HEAT)
OPENS ON TEMP. DECREASE TYPICAL SETTING 60
º
F./2
º
DIFF.
A2 A1
o FIELD WIRED
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:
*
*
*
*
*
*
o
*
*
*
*
*
*
*
*
D1
EXHAUST DAMPER
GROUND
FR FC
CR
CR
FROST CONTROL INDICATOR
6C
12 C
ROTATION INDICATOR
DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.
SUPPLY DIRTY
FILTER SWITCH
EXHAUST DIRTY
FILTER SWITCH
DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.
USER INTERFACE CONNECTIONS:USER INTERFACE CONNECTIONS:USER INTERFACE CONNECTIONS:
USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.
USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.
TO FR AND FC
ON VFD-W
SEE BELOW FOR
TERMINAL CONNECTIONS
C
NC NO
NC
C
NO
ECONOMIZER CONTROL
S6
Y1
MOTOR
MOTOR
EXHAUST FAN
SUPPLY FAN
SC
R4
R3
1
L1
L3
L2
S1
1
0-10 VDC
0-10 VDC
3
FR
VFD-S
3
FC
T1
T3
T2
SC
L1
L3
L2
S1
FR
VFD-E
FC
T1
T3
T2
VFD-E O.L.
MB MC
R3
27
EXHAUST FAN
VFD-S O.L.
MB MC
R4
27
SUPPLY FAN
6
R3
8
*
*
6
2
NC
S2
1
T2
C
12
MC
ROTATION SENSOR
MA
ON VFD-W
TO MA AND MC
*
EC
THERMOSTAT(S) TS1,
24 VAC
THERMOSTAT CONTROLLER(S)
OA-SENSOR
SENSOR
COM
o
PS2
PS3
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.
Wiring Diagram
OPTIONAL ACCESSORIES