System information

13
Fig. 12 - Wiring diagram (400-3-50)
Max. wire size 6 AWG
Field
power
supply
See electric
heat schematic
Electric
heaters
Used with accessory
electric heat option only.
Used with heater options
5, 10, 15 and 20 kW.
Max. wire size 2 AWG.
50JZ 036 only
Power Contactor
3.2 A manual reset
See note 5
Defrost board
Accessory electric heat
Field thermostat
(see note 2)
Unit component arrangement
Outdoor fan
section
Indoor fan
section
Compressor
section
Control box area
Electric
heat
Dis-
connect
24 V
splice box
50JZ 036 only
T = 30 T + 10 min.
T = 50 max.
T = 90
Compressor delay
Last
defrost
cyle
Closes
TSAT
Opens
Field splice
Terminal (marked)
Terminal (unmarked)
Splice
Splice (marked)
Factory wiring
Field control wiring
Field power wiring
Accessory or optional wiring
To indicate common
potential only; not to
represent wiring
24 V power
entry
AHA - Adjustable heat anticipator
Auto - Automatic
C - Contactor
CAP - Capacitor
CB - Circuit breaker
CCN - Crankcase heater
COMP - Compressor motor
CTD - Compressor time delay
DB - Defrost board
DFT - Defrost thermostat
DR - Defrost relay
EQUIP - Equipment
FAN - Fan
GND - Ground
HPS - High pressure switch
Notes:
1. If any of the original wires furnished are replaced, it must be replaced with type 90°C wire or equivalent.
2. See price pages for thermostat and subbases.
3. Use 75 degree copper conductors for field installation.
4. For high-speed IFM disconnect red wire from IFR 21 and connect black wire from IFM. For medium speed, disconnect red wire from IFR 21 and connect blue wire from IFM.
5. Defrost timer to be set at 90 min., except for 50JZ 048 and 060 models, set at 50 min.
Colour code
BLK - Black
BLU - Blue
BRN - Brown
GRA - Gray
GRN - Green
ORN - Orange
PNK - Pink
RED - Red
VIO - Violet
WHT - White
YEL - Yellow
Legend
HR - Heater relay
HTR - Heater
IFC - Indoor fan contactor
IFM - Indoor fan motor
LPS - Low pressure switch
OFC - Outdoor fan contactor
OFM - Outdoor fan motor
PRM - Phase rotation monitor
QT - Quadruple terminal
RVS - Reversing valve
solenoid
TC - Thermostat - cooling
TH - Thermostat - heating
TRAN - Transformer
TSAT - Thermostat