45
SSCBL-RPBL-IOM (10-22) 149159-C
Table 22. Gas Connection Sizes
Gas Type
Unit Size
400
500–1200
Connection Size (Inches (mm))
Natural gas
1 (25)
1-1/4 (32)
Propane
NOTE: The above are not supply line sizes . They are gas connection sizes for a standard unit .
Electrical Connections
⚠ CAUTION ⚠
• If any of the original wire as supplied with the appliance must be replaced, it must be replaced
with wiring material having a temperature rating of at least 105°C, except for the sensor lead
wires, which must be rated at 150°C.
• All external wiring must be within approved conduit and have a minimum temperature rise of 60°C.
• Keep electric and gas supply components clear of service panels.
NOTE: Ensure that all wiring is in accordance with the wiring diagram provided with the unit.
Electrical options are identified on this wiring diagram. Refer to separate instruction sheets for
any optional equipment provided.
•
All electrical wiring and connections, including electrical grounding, MUST be made in accordance with local,
state, and national codes and regulations and with the
National Electric Code
(ANSI/NFPA 70) or, in Canada, the
Canadian Electric Code
, Part 1 (CSA C .22 .1) .
•
Check any local ordinances or gas company requirements that apply .
•
Check the rating plate on the heater for the supply voltage and for current requirements . A separate line voltage
supply with fused disconnect switch should be run directly from the main electrical panel to the unit, making
connections in the junction box .
• Convenience outlet:
When a convenience outlet (option BC) is included, a separate power supply must be provided
to the receptacle . This circuit MUST BE on a ground fault breaker to meet requirements .
• Disconnect switch:
A disconnect switch is a required part of this installation . Switches are available as options
or parts or may be supplied locally . When ordered as an optional component, the disconnect switch is shipped
separately . The disconnect switch may be fusible or non-fusible . When providing or replacing fuses in a fusible
disconnect switch, use dual element time delay fuses and size according to 1 .25 × maximum total input amps .
When installing, ensure that the conduit and switch housing are clear of furnace panels and inspection plates .
Allow at least 4 feet (1 .2 meters) of service room between the switch and removable panels . Refer to
for field-supplied wiring sizes—from disconnect to electrical box—for connection to the motor contactor or starter .
