Dual Fuel System with Two-Stage Furnace and Two-Stage Heat Pump
Use the following diagram for wiring a dual fuel system with two-stage furnace and two-stage heat pump. The equipment and
sensor wiring is done at the HZ432 panel and shown in the literature for that panel.
NOTE:
You can use a conventional thermostat for a heat pump system; however, em heat can only be controlled by heat
pump thermostats or by pressing the Emergency Heat button on the HZ432 zone panel. The diagram below shows a
heat pump thermostat used with a heat pump system.
ARD OR ZD
DAMPER
SPRING-OPEN
POWER-CLOSED
Rc
R
C
AUX/E
Y
Y2
G
O/B
L1
(HOT)
L2
DEDICATED
TRANSFORMER
TO AZ1
AND AZ2
ON HZ432
1
ONLY TWO WIRES ARE REQUIRED TO CONNECT THE TAZ-4H PANELS TO THE MAIN HZ432 PANEL. IF MORE THAN ONE TAZ-4H IS USED,
EACH TAZ-4H CAN BE WIRED IN A DAISY CHAIN OR PARALLEL TO EACH OTHER, CONNECTING THE AZ1 AND AZ2 TERMINALS BETWEEN
PANELS. EACH AZ1 AND AZ2 TERMINAL CAN FIT TWO WIRES TO SIMPLIFY DAISY CHAIN WIRING.
Fig. 11. Zone panel wiring dual fuel: two-stage furnace and two-stage heat pump.
M1
M4
M6
R
C
W1/E
W2
W3
Y1
Y2
G
O/B
L
R
R
C
C
AZ1
AZ2
1
M1
M4
M6
R
C
W1/E
W2
W3
Y1
Y2
G
O/B
L
M1
M4
M6
R
C
W1/E
W2
W3
TAZ-4H
Y1
Y2
G
O/B
L
ZONE A
ZONE B
M1
ZONE C
M4
M6
ZONE D
R
C
W1/E
W2
W3
Y1
Y2
G
O/B
L
HOME
CONFIG
CHECK OUT
ADJUST SETTING
9
TAZ-4H ADD-A-ZONE PANEL
M1 COMMON
RRD OR MARD
DAMPER
M4 OPEN
POWER-OPEN
POWER-CLOSED
M6 CLOSED
Rc
R
C
AUX/E
Y
Y2
G
O/B
ARD OR ZD DAMPER
SPRING-OPEN
POWER-CLOSED
Rc
R
C
AUX/E
Y
Y2
G
O/B
ARD OR ZD
DAMPER
SPRING-OPEN
POWER-CLOSED
Rc
R
C
AUX/E
Y
Y2
G
O/B
M38625
33-00578EFS—01