10
ELECTRICAL CONNECTIONS
* Thermostat wires tagged ÒWÓ and ÒGÓ must be
connected together except when using a general
purpose ÒSPDTÓ 24VAC relay and a standard thermostat
with subbase, or when using Honeywell T834H-1009 or
T834H-1017 thermostats. Also refer to Figure 7 for other
wiring connections.
Figure 7 - C1267G
THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS:
The initial heat anticipator setpoint should equal the
thermostat's current amperage draw when the unit is
firing. This setpoint should be measured for the best
results. Use the recommended ranges as a guide. If
further information is needed, consult your thermostat
manufacturer's instructions.
Recommended Heat Anticipator Setting Ranges:
25 ft. (7.6m)
50 ft. (15.2m)
Gas Ignition Type
T'stat Wiring
T'stat Wiring
For Natural Vent Units:
Standing Pilot
0.68 to 0.75 A
0.73 to 0.81 A
Intermittent (Spark)
0.76 to 0.81 A
0.81 to 0.91 A
FAN TIME DELAY CONTROL
Leads from time delay controls are factory wired to the
junction box (when ordered as an optional component).
The fan control is a time delay relay (approximately 45
seconds ON, 65 seconds OFF). The fan control is rated
at 17 amps.
NOTICE: The start-up fan delay must not exceed 90
seconds from a cold start.
IMPORTANT: For all wiring connections, refer to
the wiring diagram that your unit is equipped with
(either affi xed to the side jacket or enclosed in your
unit's installation instruction envelope). Should any
original wire supplied with the heater have to be
replaced, it must be replaced with wiring material
having a temperature rating of at least 105°C.
Should any high limit or blocked vent (spill) switch
wires have to be replaced, they must be replaced
with wiring material having a temperature rating of
200°C minimum.
HAZARDOUS VOLTAGE!
DISCONNECT ALL ELECTRIC
POWER INCLUDING REMOTE
DISCONNECTS BEFORE
SERVICING. Failure to
disconnect power before
servicing can cause severe
personal injury or death.
Standard units are shipped for use on 115 volt, 60 hertz
single phase electric power. The motor name-plate and
electrical rating on the transformer should be checked
before energizing the unit heater electrical system. All
external wiring must conform to the latest edition of ANSI/
NFPA No. 70, National Electrical Code and applicable
current local codes; in Canada, to the Canadian Electrical
Code, Part 1 CSA Standard C22.1.
Do not use any tools (i.e. screwdriver,
pliers, etc.) across the terminals to check for power.
Use a voltmeter.
It is recommended that the electrical power supply
to each unit heater be provided by a separate, fused
and permanently live electrical circuit. A disconnect
switch of suitable electrical rating for each unit heater
should be located as close to the gas valve and controls
as possible. Each unit heater must be electrically
grounded in accordance with the latest edition of
the National Electric Code, ANSI/NFPA No. 70 or CSA
Standard C22.1. Sample wiring connections are depicted
in Figure 7.
THERMOSTAT WIRING AND LOCATION
NOTICE: The thermostat must be mounted on a
vertical vibration-free surface free from air currents
and in accordance with the furnished instructions.
Mount the thermostat approximately 5 feet (1.5m) above
the floor in an area where it will be exposed to a free
circulation of average temperature air. Always refer to the
thermostat instructions as well as our unit wiring diagram
and wire accordingly. Avoid mounting the thermostat in
the following locations:
1. Cold areas - Outside walls or areas where drafts may
affect the operation of the control.
2. Hot areas - Areas where the sun's rays, radiation, or
warm air currents may affect control operation.
3. Dead areas - Areas where air cannot circulate freely,
such as behind doors or in corners.
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