Typical Wiring Diagram - Greenheck HRE-20 Installation, operationand Maintenance Manual

OPTIONAL ACCESSORIES
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
L2
TO UNIT
L3
GROUND
R
S1
G
R3
T1
6 8
16
15
PS1
NO C
S6
Y1
TR
EC
1
2-10V
SR
620 OHM RESISTOR OR
RETURN AIR SENSOR SR+
SO
OUTDOOR AIR
SENSOR
SO+
T
MIXED AIR
SENSOR T1
3
22
FU5
TR1
VFD-E O.L.
MB MC
4
VFD-S O.L.
MB MC
TO MA AND MC
MA
ON VFD-W
MC
1 C
S2
T2
6 2
NC 12
OA-SENSOR
SENSOR
24 VAC
THERMOSTAT(S) TS1,
TS1
6
COM NO
TR1
+
FR
TO FR AND FC
ON VFD-W
-
FC
5
2
4
L1 T1
VFD-E
T2
L2
L3 S1
SC FR FC T3
EXHAUST FAN
R3
MOTOR
1 3 0-10 VDC
L1 T1
VFD-S
T2
L2
L3 S1 SC FR FC T3
SUPPLY FAN
R4
MOTOR
1 3 0-10 VDC
L1
T1
L2
VFD-W
T2
L3
T3
ENERGY WHEEL
MA MC
S1 SC FR FC
R1
SEE BELOW FOR
3 4
TERMINAL CONNECTIONS
MULTI-VOLTAGE PRIMARY
24 SECONDARY
C
EXHAUST DAMPER
D1
R3
EXHAUST FAN
2 7
D2 SUPPLY DAMPER
R4
SUPPLY FAN
2 7
R1
ENERGY WHEEL
A2 A1
ROTATION SENSOR
COM THERMOSTAT CONTROLLER(S)
B1
T1 FROST CONTROL
A1 A2
ECONOMIZER CONTROL
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
o
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.
* FACTORY SUPPLIED AND WIRED
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: 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.
DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT. DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.
PS2
NC C
SUPPLY DIRTY
R
FILTER SWITCH
PS3
NC C
EXHAUST DIRTY
R
FILTER SWITCH
FROST CONTROL INDICATOR
ROTATION INDICATOR
NO
C
NO
C
6 C
12 C