Field Wiring - Williamson-Thermoflo GWC-070 Manual

GWC S 2
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Wiring
(continued)
Figure 62
Field wiring connections — service switch and thermostat (or end switch) provided by installer
DHW
Connect the DHW aquastat as shown in wiring above. The
Economy function of the control is not utilized with DHW
input.
R & C Connections
24 Vac should be used for power stealing thermostats only !
Other devices requiring 24 Vac should have
separate power supply.
Wiring multiple zones
Refer to zone valve manufacturer's literature for wiring and
application. A separate transformer is required to power
zone valves. Zoning with circulators requires a relay for
each circulator.
When using three-wire zone valves, take care to
avoid mis-wiring. This can impose an addi-
tional 24 volts across the boiler control circuitry. The IBC will
sense this problem and lockout. It will flash the POWER and
TSTAT CIRC lights to indicate the problem. See label on IBC
for explanation of lockout conditions. To verify before con-
necting to boiler, disconnect field thermostat wires at boiler.
Place a voltmeter across the leads. Then watch the voltmeter
as each zone is activated (by activating zone thermostat). There
should never be a voltage reading across the two leads coming
to the boiler. If you see a voltage reading, one or more zone
valves is mis-wired.
54
-
fired water boiler
— Boiler Manual
Carbon monoxide detector
Direct Exhaust
For
tector is required in the boiler room. The carbon
monoxide detector must be wired on the same
electrical circuit as the boiler. For
units, a carbon monoxide detector that is wired on
the same electrical circuit as the boiler is strongly
recommended.
Figure 63 Wiring location for additional limit controls
units, a carbon monoxide de-
Direct Vent
Part number 550-142-786/0712