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Honeywell TrueZONE HZ221 Installation Manual page 6

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Installation Guide
WiriNg
6
Connect equipment as shown.
The DS/BK terminal is used with a variable-speed fan.
Connect to the DS, BK, or ODD terminal on the furnace
equipment. When only one zone calls for heat, cool, or
fan, the DS/BK terminal operates the fan at low speed
to reduce airflow.
7
Connect transformer as shown.
The following diagram is an overall view of wiring for a heat pump system as depicted in steps 3–7.
AIR
HANDLER
24 VOLT TRANS.
C
R
AUX HEAT
E
FAN RELAY
G
Y
HEAT PUMP
C
R
Y
REVERSING
VALVE
L1
(HOT)
R
C
L2
DEDICATED
TRANSFORMER
C7735A1000
69-2200—0
L1
(HOT)
L2
DEDICATED TRANSFORMER
R
C
E/Aux
Y
G
O
HEAT
B
COOL
DS/BK
FAN
L
PURGE
R
C
DATS
DATS
EMERGENCY HEAT
PURGE OVERRIDE
R
R
C
C
M28237
M1
M4
M6
R
C
E/AUX
Y
G
O
L
M1
ZONE 1
M4
ZONE 2
M6
EM HEAT
R
C
E/AUX
Y
G
O
L

AIR
HANDLER
24 VOLT TRANS.
C
R
AUX/EM HEAT
E
E/Aux
FAN RELAY
G
Y
DS/BK
HEAT PUMP
C
R
Y
REVERSING
VALVE
M1 COMMON
RRD OR MARD DAMPER
POWER-OPEN
M4 OPEN
POWER-CLOSED
M6 CLOSED
ARD OR ZD DAMPER
SPRING-OPEN
POWER-CLOSED
R
C
E
AUX
Y
G
O/B
L
ZONE 2 THERMOSTAT
M27339
R
C
Y
G
O
B
L
M28236A

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