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Fig. 22—Typical Wiring Diagrams (Furnace with Heat Pump) Continued
UNIT 24 VAC (R)
C
R
Y1
O
2-SPEED
HEAT PUMP
(38YD)
Yellow
Red
Blue
White
Brown
Green
Orange
Black
COOL 1 (Y1)
COOL 2 (Y2)
HEAT 1 (W1)
HEAT 2 (W2)
FAN (G)
RV-COOL (O)
RV-HEAT (O)
OR
FURNACECOMFORT ZONE CENTER
G
Y2
H
R1
R
R1 = Relay DPST, Pilot Duty,
24-v coil (HN61KK324) or Equivalent.
H = Humidistat, opens on humidity
rise (HL38MG026)
W2
W
C
Y
Latent Capacity Control (LCC)
H
L
W3
A94049
UNIT 24 VAC (R)
C
Y2
2-SPEED
HEAT PUMP
(38YD)
Yellow
Red
Blue
White
Brown
Green
Orange
Black
COOL 1 (Y1)
COOL 2 (Y2)
HEAT 1 (W1)
HEAT 2 (W2)
FAN (G)
RV-COOL (O)
RV-HEAT (O)
OR
FURNACECOMFORT ZONE CENTER
I
NOTE: 38YD – with dual fuel, use the 38YD “Furnace Interface” and
“Balance Point” feature on the heat pump control to operate
dual fuel option. Configure the 4-Zone controller to act as
if it were controlling a single speed heat pump. Turn (T-6) ON.
Turn (T-9 & T-26) OFF. Set (S-7) to 0. (Let the 38YD perform
the dual fuel optimization).
R
W2
O
W2
R
G
C
W3
L
Y1
Y/Y2
W/W1
In addition, lock furnace into “low fire”. This may help prevent over
conditioning during the back-up heat (furnace) mode. This will also
allow the furnace to stage between low and high fire. Before using
this feature read furnace Installation Instructions for two-stage
operation. Connect “W2” from the Comfort Zone Center to “W2” on
the furnace control board.
See Furnace Installation Instructions For Details Involving
Set-Up Switch Configuration and Two-Stage Furnace Operation.
38YDA – with dual fuel, same as above, however in addition if
(T-26) is turned “ON”, and stage 2 latch pot is set to zone position,
4 stages of heat are possible.
See Heat Pump Installation Instructions For Details Involving
Two-Speed Configuration and Operation.
A94312
31