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—15—
ETTESSA
C
LA
BOLG 619FNF
RESNEDN
O
C
ROODTUO 538ENF
NOTE 6
NOTE 5
NOTE 4
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C-
M
T
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Fig. 24 — 619FNF/538ENF Cooling Only System Wiring Diagram
LEGEND
1PCB — Main Control Printed
Circuit Board
2PCB — Display Board
C—Contactor
CAP — Capacitor
CH — Crankcase Heater
CHS — Crankcase Heater Switch
COMP — Compressor
CRC — Carrier Room Controller
DP — Drain Pump
EQUIP.
GND
— Equipment Ground
FC — Fan Capacitor
FS — Float Switch
GND — Ground
HPS — High Pressure Switch
IFM — Indoor Fan Motor
IR — Infrared
ITP — Indoor Test Point
LLPS — Liquid Low Pressure
Switch
LM — Louver Motor
LMS — Louver Micro Switch
OFM — Outdoor Fan Motor
OL — Overload
S—Emergency
TB — Terminal Block
TM — Sensor
TRAN — Tr an sforme r
Terminal (Marked)
Terminal (Unmarked)
Splice
Terminal Block
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
Plug Connector
NOTES:
1. If any of the original wire furnished must be replaced, it must be
replaced with Type 90° C wire or its equivalent.
2. Wire in accordance with National Electrical Code (NEC) and local
codes.
3. Compressor and fan motors are protected by internal thermal
overloads.
4. Indoor unit transformer has internal 2A thermal fuse on the primary
side.
5. Infrared (IR) connection to be inserted on “J5” (replace the actual
factory-installed “CRC” connector) for IR option.
6. Terminal strip for Carrier Room Controller (CRC) connection.
7. Compressor crankcase heater installed on 538QNF035 and
538QNF030 only.
8. Outdoor unit transformer is factory wired for 230 v. For 208 v move
the black wire to the 208-v tap.
9. Use minimum 60° C wire for the field power wiring.
NOTE: All thermistors are identical.
THERMISTOR EQUIVALENCE
TEMPERATURE RESISTANCE
°F °C Ω
95 35 6,500
72 22 11,400
32 0 32,500