Troubleshooting guide

UNIT
557A
TERMINAL NO.
123 4
CFM
(VIO) Aux, Heat Range 1300 1400 1600 1750
(BLU) AC/HP Size 1400 1600 1750 2000
(GRY) AC/HP Time Delay
30 sec.
ON
1 min.
OFF
0 sec.
ON
0 sec.
OFF
0 sec.
ON
30 sec.
OFF
0 sec.
ON
45 sec.
OFF
LEGEND
AWG — American Wire Gage
C—Contactor, Compressor
CAP — Capacitor
COMP — Compressor Motor
EQUIP — Equipment
FL — Fuse Link
FU — Fuse
GND — Ground
HR — Heater Relay (Strip Heat)
ICM — Integrated Control Motor
IFO — Indoor-Fan On
NEC — National Electrical Code
OFM — Outdoor-Fan Motor
QT — Quadruple Terminal
SEC — Secondary
TRAN — Transformer
Field Splice
Marked Wire
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or
Optional Wiring
To Indicate Common
Potential Only, Not to
Represent Wiring
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. Number(s) indicates the line location of contacts. A bracket over (2) numbers signifies single
pole double throw contacts. An underlined number signifies a normally closed contact. Plain
numbers (no lines), signify a normally open contact.
3. Set heat anticipator at .6 amp for first stage and .3 amp for second stage.
4. Use copper conductors only.
5. For ICM board connections, see table.
Fig. 11 — Wiring Diagram, Units 557A048,060; 208/230-1-60
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