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W8703A DAMPER INTERFACE MODULE
T8635L
C7089B
OUTDOOR
TEMPERATURE
OT
SENSOR
V8043F
TR
TH
END
SWITCH
TH-TR
MODEL PMT-40
24 VAC
TRANSFORMER
LINE
VOLTAGE
W8635A
L2
L1
(HOT)
SYSTEM
TRANSFORMER
Fig. 11. Hydronic heat with time-out and indirect water heater with no air conditioning wiring diagram.
Wiring W8703 For Hot Water Zoning
Hydronic Zone Applications
Networked zoning can be used to control hydronic
systems with or without ducted air conditioning sys-
tems. The damper interface module controls a 24 Vac
zone valve directly or a 120 Vac circulator using isola-
tion relays.
69-1344-1
T8635L
2
OT
1
3
V8043F
TR
TH
END
SWITCH
TH-TR
IWH AQUASTAT
YELLOW
IWH
V8044
YELLOW
VALVE
1
2
3
G
C
W1
R
W2
Y1
R H
R C
Y2
T8635L
2
OT
OT
1
3
V8043F
TR
TH
END
SWITCH
TH-TR
T
BOILER
T
DELAY ON
T
T
BREAK TIMER,
SET FOR 30 MINUTES
SENSE
NC
SENSE
COM
HYDRONIC ZONING WITH ZONE VALVES
Networked Zoning can control a hydronic system using
Honeywell V8043 or similar zone valves. The zone
valve end switches are wired in parallel and connected
to the Aquastat on the boiler. A relay is used to prevent
the dampers from opening when the heating system is
idle. See Fig. 5.
In a ducted air conditioning system, dampers are con-
nected as shown in Fig. 6. Power closed, spring open,
round ARD or rectangular ZD dampers are recom-
mended. Three-wire, power open/power closed
dampers such as the AOBD are wired as follows:
10
2
OT
OT
1
3
W8703A
OPEN
CLOSE
1
2
OPEN
CLOSE
3
OPEN
TR1
CLOSE
TR2
COM
R8222N1011
1
L1
(HOT)
L2
EXTERNAL
40 VA
TRANSFORMER
3
M20250A
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