IM 1072-1
Water to Water Source Heat Pumps
Page 29 of 44
Wiring Diagram
Legend
208/230-60-3, Unit Sizes 360, 420
THREE PHASE FIELD POWER SUPPLY PER UNIT RATING PLATE. MINIMUM CIRCUIT
AMPACITY AND MAXIMUM SIZE OF TIME-DELAY FUSE OR HACR-TYPE CIRCUIT BREAKER
PER UNIT RATING PLATE. PROVIDE DISCONNECTING MEANS AND EQUIPMENT
GROUNDING AS REQUIRED.
TRANSFORMER MAY HAVE TAPS FOR 120V, 208V, 240V, OR 480V SYSTEM POWER SUPPLY.
BEFORE APPLYING POWER TO THE UNIT, ENSURE TRANSFORMER IS WIRED FOR
APPROPRIATE SYSTEM POWER SUPPLY. INSULATE SEPARATELY ANY UNUSED LEADS.
POLARITY IS NOT INDICATED. TYPICAL TRANSFORMER SHOWN. SEE TRANSFORMER LABEL
FOR LEAD COLOR CODING. A 4.0 AMP POTTER & BRUMFIELD PUSH TO RESET
FUSEHOLDER-TYPE THERMAL CIRCUIT BREAKER, P&B PART NO. W28XQ1A-4, IS MOUNTED
ON THE TRANSFORMER. THE W28-X IS WIRED IN SERIES WITH ONE SIDE OF THE
TRANSFORMER SECONDARY WINDING.
“RVS1” AND “RVS2” ARE USED ONLY WITH WWR MODELS AND ARE ENERGIZED IN
COOLING MODE.
“RVS1” AND “RVS2” ARE NOT USED WITH WWC AND WWH MODELS.
IF POWER MONITOR OUTPUT CONTACTS DO NOT TRANSFER WHEN POWER IS APPLIED
TO UNIT (BICOLOR LED GLOWS GREEN UNDER NORMAL CONDITIONS AND RED
DURING FAULT CONDITIONS):
1. VERIFY THAT ALL THREE PHASES ARE PRESENT AND ARE OF THE CORRECT
VOLTAGE. IF ALL THREE PHASES ARE PRESENT AND ARE OF THE CORRECT VOLTAGE,
PHASE ROTATION MAY BE INCORRECT. PERFORM STEP 2.
2. DISCONNECT POWER TO THE WW* UNIT. VERIFY THAT POWER IS IN FACT
DISCONNECTED. SWAP ANY TWO OF THE THREE UNIT POWER SUPPLY WIRES. WHEN
POWER IS REAPPLIED, OUTPUT CONTACTS SHOULD NOW TRANSFER.
1
2
4
11
LEGEND
FUNCTIONAL
DESIGNATION
LINE
NUMBER
DESCRIPTION
C1L
46
OPTIONAL INDICATOR LIGHT - COMPRESSOR 1 ON
C2L
47
OPTIONAL INDICATOR LIGHT - COMPRESSOR 2 ON
CC1
29
COMPRESSOR NO. 1 CONTACTOR
CC1-A1
#
"CC1" AUXILIARY CONTACT NO. 1
CC1-A2
#
"CC1" AUXILIARY CONTACT NO. 2 (WHEN USED)
CC2
40
COMPRESSOR NO. 2 CONTACTOR
CC2-A
#
"CC" AUXILIARY CONTACT (WHEN USED)
CCH1,CCH2
11,12
CRANKCASE HEATER NO. 1 & NO. 2
CCM1
22
COMPRESSOR CONTROL MODULE NO. 1
CCM2
33
COMPRESSOR CONTROL MODULE NO. 2
CHR
60
CHANGEOVER RELAY (WHEN USED)
CM1
2
COMPRESSOR NO. 1
CM2
5
COMPRESSOR NO. 2
COPM1
12,29
COMPRESSOR NO. 1 OVERLOAD PROTECTION MODULE
COPM2
14,40
COMPRESSOR NO. 2 OVERLOAD PROTECTION MODULE
CR1
58
COMPRESSOR NO. 1 PILOT RELAY
CR2
59
COMPRESSOR NO. 2 PILOT RELAY
EGB
4
EQUIPMENT GROUNDING BAR
F1,F2,F3
7
FUSING - SEE FUSE TABLE
FL
45
OPTIONAL INDICATOR LIGHT - FAULT
FS-L
25
OPTIONAL FLOW PROVING SWITCH – LOAD COIL
FS-S
25
OPTIONAL FLOW PROVING SWITCH – SOURCE COIL
HP1
27
HIGH DISCHARGE PRESSURE CUTOUT SWITCH NO. 1
HP2
38
HIGH DISCHARGE PRESSURE CUTOUT SWITCH NO. 2
LP1
27
LOW SUCTION PRESSURE CUTOUT SWITCH NO. 1 (CKT 1)
LP2
38
LOW SUCTION PRESSURE CUTOUT SWITCH NO. 2 (CKT 2)
LP3
23
LOW SUCTION PRESSURE CUTOUT SWITCH NO. 3 (CKT 1)
LP4
34
LOW SUCTION PRESSURE CUTOUT SWITCH NO. 4 (CKT 2)
LTC
19,27,38 LOW FLUID TEMPERATURE CUTOUT MODULE
PDB
1,2,3
POWER DISTRIBUTION BLOCK
PM
9,51
OPTIONAL POWER MONITOR
RVS1
52
REVERSING VALVE SOLENOID CKT 1 (WHEN USED)
RVS2
53
REVERSING VALVE SOLENOID CKT 2 (WHEN USED)
TB1
+
TERMINAL BOARD NO. 1
TB2
64,65
TERMINAL BOARD NO. 2
TB3
+
TERMINAL BOARD NO. 3
TB4
23
TERMINAL BOARD NO. 4
TB5
34
TERMINAL BOARD NO. 5
TB6
11
TERMINAL BOARD NO. 6
TR1
50
CONTROL TRANSFORMER NO. 1
TR2
17
CONTROL TRANSFORMER NO. 2
TC
54
TEMPERATURE CONTROLLER (OPTIONAL)
TS-C
55
AQUASTAT – COOLING (WHEN USED)
TS-H
54
AQUASTAT – HEATING (WHEN USED)
# SEE LINE NUMBER TO THE RIGHT OF CONTACTOR COIL ON WIRING DIAGRAM.
+ MULTIPLE LINE NUMBERS.
3 SEE FIGURE 1 ON SHEET 3 OF THIS DRAWING FOR BOARD LAYOUT FOR SENSOR
LOCATIONS, TEMPERATURE SETTING NOTE, AND SENSOR RESISTANCE VERSUS
TEMPERATURE GRAPH.
COMPRESSOR RELAY CONTACTS ARE PROVIDED TO OPERATE AN EXTERNAL PILOT
DUTY LOAD (SUCH AS A PUMP RELAY COIL) WITH THE COMPRESSORS.
AN EXTERNAL LOAD POWERED BY TRANSFORMER “TR1” IN THE WW* UNIT MUST
NOT EXCEED 12 VA SEALED (96 VA INRUSH) @ 24 VOLTS AC.
EXTERNAL LOADS POWERED FROM AN EXTERNAL SOURCE ARE LIMITED TO
CLASS 2 CIRCUITS ONLY (30 VOLTS AC MAXIMUM). EXTERNAL LOAD
CHARACTERISTICS MUST NOT EXCEED 10 AMPS MAKE, 1 AMP BREAK.
MAINTAIN
SEPARATION BETWEEN CLASS 2 CIRCUITS OF DIFFERENT SOURCES.
PROVIDE DISCONNECTING MEANS, EQUIPMENT GROUNDING, AND
OVERCURRENT PROTECTION AS REQUIRED.
20
TYPICAL FIELD CONTROL WIRING SHOWN. ACTUAL FIELD WIRING MAY DIFFER FROM
WIRING SHOWN HERE. USE 18 AWG MINIMUM FOR FIELD 24 VOLT CONTROL WIRING.
TYPICAL REMOTE SWITCH SHOWN. REMOTE SWITCH MAY BE SUPPLIED BY OTHERS
OR IS AVAILABLE AS AN OPTIONAL ACCESSORY FROM THE FACTORY. MINIMUM PILOT
DUTY RATING OF EACH POLE OF REMOTE SWITCH IS 24 VOLT-AMPERES @ 24 VOLTS
AC WHEN CONNECTED AS SHOWN.
12
CONDUCTOR “O” REQUIRED WITH WWR REVERSE CYCLE UNITS.
CONDUCTOR “O” NOT USED WITH WWC COOLING AND WWR HEATING UNITS.
18
“CHR” IS USED ONLY WITH “WWR” UNITS.
“CHR” IS NOT USED WITH “WWC” AND “WWH” UNITS.
19
WHEN “CHR” IS NOT USED, THIS WIRE CONNECTS DIRECTLY TO EITHER TERMINAL 1
ON “PM” --OR-- WHEN “PM” IS NOT USED, TO TERMINAL R ON “TB1”.
10
13
AQUASTATS “TS-H” AND “TS-C” ARE NOT USED WHEN OPTIONAL FACTORY INSTALLED
TEMPERATURE CONTROLLER “TC” IS FURNISHED. TYPICAL AQUASTATS SHOWN.
AQUASTATS MAY BE SUPPLIED BY OTHERS OR ARE AVAILABLE AS AN OPTIONAL
ACCESSORY FROM THE FACTORY. MINIMUM PILOT DUTY RATING OF EACH POLE OF
AQUASTAT IS 24 VOLT-AMPERES @ 24 VOLTS AC WHEN CONNECTED AS SHOWN.
14
7 WHEN OPTIONAL “LTC” IS NOT USED, THESE TWO WIRES ARE SPLICED TOGETHER.
5 WHEN “FS-L” AND “FS-S” ARE NOT USED, THIS WIRE CONNECTS DIRECTLY TO
TERMINAL 6 OF “TB3”.
6 WIRED AS SHOWN FOR OPEN LOOP OR HIGH TEMPERATURE CLOSED LOOP
APPLICATIONS. FOR LOW TEMPERATURE CLOSED LOOP APPLICATIONS, MOVE THIS
WIRE FROM TERMINAL 6 TO TERMINAL 7 ON "TB4".
THIS WIRE CONNECTS DIRECTLY FROM TERMINAL S1 TO TERMINAL Y1 ON “TB1” WHEN
OPTIONAL TEMPERATURE CONTROLLER “TC” IS NOT FURNISHED.
15
THIS WIRE CONNECTS DIRECTLY FROM TERMINAL S2 TO TERMINAL Y2 ON “TB1” WHEN
OPTIONAL TEMPERATURE CONTROLLER “TC” IS NOT FURNISHED.
16
SEE FIGURE 2 ON SHEET 3 OF THIS DRAWING FOR COMPRESSOR CONTROL MODULE
OPERATION.
9 WHEN OPTIONAL “LTC” IS NOT USED, THESE TWO WIRES ARE SPLICED TOGETHER.
8 WIRED AS SHOWN FOR OPEN LOOP OR HIGH TEMPERATURE CLOSED LOOP
APPLICATIONS. FOR LOW TEMPERATURE CLOSED LOOP APPLICATIONS, MOVE THIS
WIRE FROM TERMINAL 8 TO TERMINAL 9 ON "TB5".
FACTORY WIRING
FIELD WIRING
EARTH GROUND
CHASSIS (PANEL) GROUND
TERMINAL BOARD NO. 3 (TB3)
COIL
NORMALLY OPEN CONTACTS
IDENTIFIABLE TERMINAL
NON-IDENTIFIABLE TERMINAL,
OTHER WIRE JUNCTIONS,
INCLUDING SCHEMATIC
NORMALLY CLOSED CONTACTS
TERMINAL BOARD NO. 1 (TB1)
SYMBOL LEGEND
OPTIONAL FIELD WIRING
TERMINAL BOARD NO. 6 (TB6)
OPTIONAL FACTORY WIRING
TERMINAL BOARD NO. 2 (TB2)
TERMINAL BOARD NO. 4 (TB4)
TERMINAL BOARD NO. 5 (TB5)
FUSE NO.
CLASS
VOLTS AC
AMPERES
TIME DELAY
F1,F2,F3†
CC
600
3
YES
FUSE TABLE
† F3 IS USED ONLY WHEN OPTIONAL POWER
MONITOR IS FURNISHED.
WHEN OPTIONAL TEMPERATURE CONTROLLER “TC” IS FURNISHED, INSTALLER MUST
PROGRAM CONTROLLER. REFER TO TEMPERATURE CONTROL INSTALLATION
INSTRUCTIONS.
WITH REVERSE-CYCLE WWR UNITS, PROGRAM CONTROLLER AS ONE STAGE
COOLING AND ONE STAGE HEATING. STAGE 1 IS THE COOLING STAGE AND STAGE 2 IS
THE HEATING STAGE.
INSTALL SENSOR @ WATER INLET PIPE (LOAD COIL).
17
BK: BLACK
PK:
PINK
BL: BLUE
PR (V): PURPLE (VIOLET)
BR: BROWN
R:
RED
G: GREEN
W:
WHITE
GY: GRAY
Y:
YELLOW
WIRE COLOR LEGEND
NOTES:
NUMBER PLACED AFTER DASH FOLLOWING
COLOR CODE INDICATES WIRE GAGE. FOR
EXAMPLE> BK-12 IS A BLACK, 12 AWG WIRE.
NO NUMBER AFTER COLOR CODE INDICATES 18
AWG WIRE. FOR EXAMPLE> BK IS A BLACK 18
AWG WIRE.
BONDING CONDUCTORS INDICATED AS GREEN
MAY ALSO BE GREEN WITH ONE OR MORE
YELLOW STRIPES.
ASTERISK AFTER DASH FOLLOWING COLOR
CODE INDICATES REFERRAL TO COMPRESSOR
WIRE SIZE TABLE.
O: ORANGE
WIRING DIAGRAM # 0962I-2634 REV. C
WW* 360, 420
208/230-3-60
