16
Gas Valves
High fire adjustment
(single and two
stage)
Low fire adjustment
(two stage only)
Gas control switch
(ON/OFF)
Figure 11
- Combination Valve (Top View)
Figure 10
- Typical Combination Valve
(Note: single stage and two stage look similar. Refer
to component label to confirm type)
Combination Valve (Single and Two-Stage)
Electrical Connections
1. Unit must be electrically grounded and all
wiring must be done in accordance with
applicable local codes and the National
Electrical Code, ANSI/NFPA 70, and/or the
CSA C22.1 Canadian Electrical code, if an
external electrical source is utilized.
2. Only use a voltmeter to check for power across
terminals.
3. In order to determine the size of the power
supply lines, check the electrical specification
plate located on the unit for ampere
requirements.
4. On units not ordered with a disconnect
switch, it is recommended that a
weatherproof disconnect switch be mounted
on or near the unit.
5. Connect power supply lines from main
disconnect switch to unit disconnect switch.
6. If original wire supplied with the furnace needs
to be replaced, it must be replaced with wiring
material having a temperature rating of at least
105°C.
7. Install thermostat or remote control station, if
supplied, according to wiring diagram.
8. Thermostats and remote control stations must
be installed in a suitably protected and secure
location to prevent tampering and damage. Do
not exposed thermostats to physical shocks or
jarring before or after installation.
WARNING
Disconnect all electric power before servicing.
Failure to disconnect power before servicing
can cause severe personal injury or death.
Refer to wiring diagram shipped with unit for
all wiring connections. Wiring diagrams are
located inside furnace control access panel.
Furnace must be wired in accordance with the
furnished diagram.
