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LEGEND FOR FIG. 38 and 39
AHA — Adjustable Heat Anticipator
BKR W/AT — Breaks with Amp Turns
C—Contactor, Compressor
CB — Circuit Breaker
CC — Cooling Compensator
CH — Crankcase Heater
CLO — Compressor Lockout
CLS — Compressor Lockout Switch
COMP — Compressor Motor
CR — Control Relay
CT — Current Transformer
DM — Damper Motor
DU — Dummy Terminal
EQUIP — Equipment
FPT — Freeze Protection
Thermostat
FU — Fuse
GND — Ground
HPS — High-Pressure Switch
HR — Heat Relay
HV — High Voltage
I—Ignitor
ICP — Ignitor Control Pack
IDM — Induced-Draft Motor
IDR — Induced-Draft Relay
IFC — Indoor (Evaporator)
Fan Contactor
IFCB — Indoor (Evaporator)
Fan Circuit Breaker
IFM — Indoor (Evaporator)
Fan Motor
IFR — Indoor (Evaporator)
Fan Relay
IP — Internal Protector
L—Light
LOR — Lockout Relay
LPS — Low-Pressure Switch
LS — Limit Switch
MAT — Mixed-Air Thermostat
MGV — Main Gas Valve
NEC — National Electrical Code
OAT — Outdoor-Air Thermostat
OFC — Outdoor (Condenser)
Fan Contactor
OFM — Outdoor (Condenser)
Fan Motor
PGV — Pilot Gas Valve
PL — Plug Assembly
PRI — Primary
PS — Pressure Switch
QT — Quadruple Terminal
R—Relay
RS — Rollout Switch
SN — Sensor
SW — Switch
TB — Terminal Block
TC — Thermostat Cooling
TDR — Time Delay Relay
TH — Thermostat Heating
TRAN — Transformer
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Splice (Marked)
Splice (Field Supplied)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential Only,
Not To Represent Wiring
NOTES:
1. Compressor and fan motors thermally protected; 3-phase motors
protected against primary single-phasing conditions.
2. If any of the original wire furnished must be replaced, it must be
replaced with type 90 C wire or its equivalent.
3. Jumpers are omitted when unit is equipped with economizer.
4. Set thermostat heat anticipator(s):
UNIT W1 W2 VOLTAGE
48HJD015 1.20 — All
48HJD025, HJE015,
HJE017
1.20 0.60 All
5. CB must-trip amps are equal to or less than 140% fullload amps.
6. Number(s) indicates the line location of used contacts. A bracket
over (2) numbers signifies a single-pole,double-throw contact.An
underlined number signifiesa normally-closed contact.Aplain (no
line) number signifies a normally-open contact.
7. The CLOlocks outthe compressor toprevent shortcycling oncom-
pressor overloadand safety devices.Before replacingCLO, check
these devices.
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