ELECTRICAL CONNECTIONS
When installed, the furnace must be electrically
grounded in accordance with local codes or, in the
absence of local codes, with the (U.S.) National Electrical
Codes, ANSI/NFPA 70 or CSA Standard C22.1; Part 1
Canadian Electrical Code. For proper installation refer to
furnace rating label for electrical ratings and for the field
wiring of this unit refer to furnace wiring specifications on
page 5 or alternately from the wiring diagram on page 31.
In all instances, other than wiring for the thermostat, the
wiring to be done and any replacement of wire shall
conform with the temperature limitation for Type T wire
[63°F rise (35°C)].
The electrical connections and the thermostat
connections are made at the openings on either side
panel of the unit in the control box area. Either side may
be used as convenient, but the provided hole plugs must
be inserted in the unused holes.
The control system depends on the correct polarity of
the power supply. Connect "Hot" (H) wire and "Ground"
(G) wire as shown in furnace wiring specification on
wiring diagram. Use reference Table on page 3 (Furnace
Specifications), for over current protection, max unit amp
rating and wire size. Use copper wire only for 120V-
supply service to unit. When replacing any original
internal wiring, use only 105°C, 16 AWG copper wire.
Thermostat:
Instructions for wiring the thermostat are packed in
the thermostat (field supplied) box. Make the thermostat
connections as shown in furnace wiring specifications at
the 24-volt terminal board located in the control box.
Single Stage Thermostat Operation:
The automatic heat staging option allows a single stage
thermostat to be used with a two stage furnace. To
activate this option, move the jumper pin (see Figure 24)
to desired setting (5 minutes or 10 minutes). The furnace
will start on first (1
ST
) stage heat and stay at first (1
ST
)
stage heat for the duration of the selected time before
switching to 2
nd
stage heat.
Figure 24
AUTOMATIC HEAT STAGING JUMPER
When installing optional accessories to this appliance,
follow the manufacturer's installation instructions included
with the accessory.
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. This may
consist of electrical wire or approved conduit when
installed in accordance with existing electrical
codes. Do not use gas piping as an electrical
ground. Failure to follow this warning can result in
an electrical shock, fire, bodily harm, or loss of life.
GAS CONNECTIONS
Gas piping shall be of such size and so installed as
to provide a supply of gas sufficient to meet maximum
demands without undue loss of pressure between the gas
meter and the furnace. It is recommended that the gas
line to the furnace shall be a separate line direct from the
meter, unless the existing gas line is of ample capacity.
Refer to gas pipe capacity table in the National Fuel Gas
Code ANSI Z223.1/NFPA54 or the CSA B149.1 Natural
Gas and Propane Installation Codes.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not
use a connector which has previously serviced another
gas appliance.
Use a joint compound (pipe dope) that is resistant to
the action of liquefied petroleum gases or any other
chemical constituents of the gases to be conducted
through the piping.
For proper furnace operation the maximum gas
supply pressure is 14" w.c. and the minimum gas
supply pressure is 4.5" w.c. - natural (11" w.c. - LP)
as shown on rating label.
Before any system of gas piping is finally put into
service, it should be carefully tested to determine if it is
gas tight. Check all piping for leaks. The piping must
stand a pressure of six (6) inches of mercury (3 PSIG) for
a period of ten (10) minutes or as required by local
authority.
20558801
Issue 0442
Page 19 of 32
Summary of Contents for Gas-Fired Furnace
Page 13: ...FURNACE WIRING SPECIFICATIONS 20558801 Issue 0442 Page 5 of 32 ...
Page 21: ...Figure 8 20558801 Issue 0442 Page 13 of 32 VENT TERMINATION CLEARANCES ...
Page 36: ...SEQUENCE OF OPERATION DIRECT IGNITION SYSTEM CONTROL 20558801 Issue 0442 Page 28 of 32 ...
Page 40: ...WIRING DIAGRAM 20558801 Issue 0442 Page 32 of 32 ...