Greenheck ERCH - Energy Recovery Unit with Packaged DX (468151) - Manual (Page 17)

17
Energy Recovery Unit with Packaged DX
FACTORY SUPPLIED AND WIRED
G
MULTI-VOLTAGE PRIMARY
24 SECONDARY
TR1
C
TO UNIT
MAIN POWER
L3
L2
L1
DS1
SUPPLY DAMPER D2
ENERGY WHEEL R1
R
4
S1
VFD-W
L3
3 4
SC
L2
L1
MC
T3
MA
T2
T1
PS1
NO C COM NO
TS1
6 FROST CONTROL
A1
T1
A2
B1
16 15
T1
ENERGY WHEEL
S1
R1
LEGEND
C1 COOLING STAGE 1 RELAY
C2 COOLING STAGE 2 RELAY
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
HG HOT GAS REHEAT VALVE
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
R11 POST HEAT RELAY
R12 DEHUMIDIFICATION RELAY
R13 ROOM CALL FOR HEAT RELAY
R14 ROTATION SENSOR RELAY
R15 ROTATION SENSOR RELAY
S1 FAN SWITCH
S2 ROTATION SENSOR (LOCATED BY WHEEL)
S3 ROTATION SENSOR (LOCATED BY WHEEL)
S4 CALL FOR HEAT SWITCH
S5 OCC/UNOCC SWITCH - CLOSED=OCCUPIED/OPEN=UNOCCUPIED
S6 CALL FOR COOL SWITCH (FIRST STAGE)
S7 CALL FOR COOL SWITCH (SECOND STAGE)
S8 CALL FOR DEHUMIDIFICATION SWITCH
ST MOTOR STARTER
T1 FROST CONTROL TIMER
TYPICAL SETTINGS t1(OFF) = 5 MIN., t2(ON) = 30 MIN.
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° F.
TS2 ECONOMIZER LOW LIMIT THERMOSTAT (JUMPER - HEAT)
OPENS ON TEMP. DECREASE TYP. SETTING 20° OFFSET OR 50°F.
TS3 ECONOMIZER UPPER LIMIT THERMOSTAT (JUMPER - HEAT)
CLOSES ON TEMP. DECREASE TYP. SETTING 65° F./2° DIFF.
TS4 ROOM OVERRIDE SENSOR
TS5 INLET AIR POST HEATER LOCKOUT THERMOSTAT (AFTER WHEEL)
CLOSES ON TEMP. DECREASE TYPICAL SETTING 65° F.
TS6 INLET AIR COMPRESSOR LOCKOUT THERMOSTAT (JUMPER-HEAT)
OPENS ON TEMP. DECREASE TYPICAL SETTING 60° F./2° 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
C R
C R
FROST CONTROL INDICATOR 6 C
12 C ROTATION INDICATOR
DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.
SUPPLY DIRTY
FILTER SWITCH
EXHAUST DIRTY
FILTER SWITCH
USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.
SUPPLY FAN
EXHAUST FAN
ST2 O.L.
MOTOR
MOTOR
ST1 O.L.
C NC NO
NC C NO
ST2 O.L.
96 95
ST1 O.L.
96 95
ST2
A2 A1
ST1
A2 A1
SUPPLY FAN
EXHAUST FAN
ST1
13 14
54
CC2-NO
55
FCS
(LOCATED IN CONDENSING FAN)
(LOCATED IN CONDENSING FAN)
56
1P2
CF2 O.L.
2P2 2P1
1P1
ST2-NO
CC1-NO
S7
Y2
51
COM NC
TS6
52
LPS HPS
CF1 O.L.
53
8 6
1
R7
3
R7
T7
3
3
T6
CF2
CF1
A1
A1
A2
A2
CONDENSING FAN 2
CONDENSING FAN 1
COMPRESSOR INTERLOCKS R7
CC2
CC1
2
1
1
7
COMPRESSOR 2
COMPRESSOR 1
COMPRESSOR 1
COMPRESSOR 2
CONDENSING FAN 1
CONDENSING FAN 2
CC1
CC2
CF1
CF2 CH1 CH2
DB1
*
*
*
*
o
o
*
*
*
*
*
*
*
620 OHM RESISTOR OR
RETURN AIR SENSOR
S6
SR+
OUTDOOR AIR
MIXED AIR
SENSOR
SENSOR
3
T
T1
SO+
SO
Y1
SR
1
TR
ON VFD-W
TO FR AND FC
FC
4
5
2
2-10V
+
-
TR1
FR
ECONOMIZER CONTROL
TERMINAL CONNECTIONS
SEE BELOW FOR
FC FR
EC
*
THERMOSTAT(S) TS1, TS6
24 VAC THERMOSTAT CONTROLLER(S)
OA-SENSOR
SENSOR COM
PS2
PS3
R14
2 4
TO MA AND MC
MC
MA ON VFD-W
S2
12 ROTATION SENSOR
R14
A2 A1
ROTATION SENSOR
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