9
ELECTRICAL CONNECTIONS
Figure 5a -
Low-voltage T
Thermostat Wiring
Single Stage
Figure 5b -
Low-voltage
Thermostat Wiring
Two Stage
Figure 5c -
T834H-1009 or
T834H-1017
Thermostat Wiring
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 for 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 Tubular Units:
0.85 to 0.90
0.90 to 1.1 A
A
Max. Setting
on T'stat
FAN TIME DELAY CONTROL:
Leads from the fan time
delay control are factory wired to the junction box. The
fan time delay control is a time delay relay
(approximately 45 seconds ON, 65 seconds OFF). The
fan time delay control is rated at 17 amps.
NOTICE: The start-up fan delay should not exceed
90 seconds from a cold start.
IMPORTANT: For all wiring connections, refer to
the wiring diagram shipped with your unit (either
affixed to the side jacket or enclosed in the
installation instructions 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 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 of 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. 70-1999, United States National
Electrical Code, and applicable 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 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 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 United States National Electrical
Code, ANSI/NFPA No. 70-1999, or CSA Standard
C22.1. Refer to Figures 5a, 5b, 5c, 5d, 5e, 5f and 5g.
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 the operation of
the control.
3. Dead Areas- Areas where the air cannot circulate
freely, such as behind doors or in corners.
