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WIRING DIAGRAM NOTES:
1. Underlined letter on dual terminal indicates its usage.
Outdoor Temperature Sensor must be attached in all dual fuel installations.
Jumper wire between O/W2 and L thermostst terminals MUST be present.
2. Y1 and O connections to 2-stage furnaces MAY NOT EXIST, or may be only a wire rather than a screw terminal.
3. Corporate thermostat model numbers begin with TSTAT_______.
4. Wiring must conform to NEC or local code.
5. To stage the electric resistance heat, consult outdoor thermostat installation instructions.
→ Fig. 9—Typical 24-v Circuit Connections (continued)
A95279
FAN COIL
Y
W
C
R
24 VAC HOT
24 VAC COM
HEAT STAGE 2
COOL/HEAT
STAGE 1
INDOOR FAN
NON-CORPORATE
NON-PROGRAMMABLE
THERMOSTAT
MODEL HP
HEAT
PUMP
RVS COOLING
EMERGENCY
HEAT
E
W3
G
R
FK4B
R
W2
Y
Y/Y2
G
W2
C
C
O
O
O
Y1
E
L
A95280
FAN COIL
Y
W
G
R
24 VAC HOT
24 VAC COM
HEAT STAGE 2
COOL/HEAT
STAGE 1
INDOOR FAN
RVS COOLING
EMERGENCY
HEAT
NON-CORPORATE
NON-PROGRAMMABLE
THERMOSTAT
MODEL HP
HEAT
PUMP
E
C
R
G
W2
O
Y
O
W2
R
C
C
FA, FB, FC,
FD, FF
Copyright 1995 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 38yra2si
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 5a 5a
PC 101 Catalog No. 533-890 Printed in U.S.A. Form 38YRA-2SI Pg 8 8-95 Replaces: 38YRA-1SI