Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-754
Printed in U.S.A.
Form 48GS,GX-3SI
Pg 2
7-99
Replaces: 48GS-2SI
Book 1 4
Tab
1a 6a
Copyright 1999 Carrier Corporation
INSTALLATION
1. Turn off gas supply, then main power supply to unit.
2. Remove access panel for compressor and control box.
See Fig. 1.
3. Spread crankcase heater arms and slide crankcase
heater over the top of the compressor. See Fig. 1.
4. Wrap heater around compressor base approximately
2 in. above compressor mounting plate.
5. Fasten heater firmly in place with fastening clip
(Fig. 1) provided with the crankcase heater.
6. Route crankcase heater leads into unit control box, fol-
lowing the path of the compressor leads. See Fig. 1.
7. Connect one black lead to the compressor contactor
terminal 11, and connect other black lead to compres-
sor contactor terminal 13 for 3-phase units; 23 (line
side) for single-phase units. See Fig. 2.
8. Attach green crankcase heater ground lead to ground
screw in control box.
9. Replace access panel.
10. Turn on main power supply, then gas supply.
C
CH
C
BLK
BLK
11
13*
CONTROL BOX
CRANKCASE
HEATER
COMPRESSOR
INDOOR FAN MOTOR
ROUTE WIRES
AS SHOWN
Fig. 1 — Typical Crankcase Heater Installation
LEGEND
*For 3-phase units only. For single-phase units, connect black lead
to terminal 23 (line side)
Fig. 2 — Crankcase Heater Wiring
C
— Compressor Contactor
CH
— Crankcase Heater
Marked Terminal
TOP CONDENSER SECTION NOT SHOWN
