Reznor RPB Unit Installation Manual - Manual (Page 24)

Form I-RPB, P/N 131782 R11, Page 24
7.2 Supply Voltage and Supply Wiring
Check the rating plate on the heater for the supply voltage and current requirements.
A separate line voltage supply with fused disconnect switch should be run directly from
the main electrical panel to the furnace, making connection to leads in the junction box.
All external wiring must be within approved conduit and have a minimum temperature
rise of 60°C. Conduit from the disconnect switch must be run so as not to interfere with
the service panels of the furnace.
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 sensor lead wires which
must be 150°C. See Hazard Levels, page 2.
If the heater has field-installed options that require electrical connections, consult the
instruction sheet and wiring diagram supplied in the option package. Specific wiring
diagrams that include standard and factory-installed options are included with the
heater. Typical wiring diagrams are on pages 25-26.
Field-Supplied Wiring Size from Disconnect to Electrical
Box for Connection to Motor Contactor or Starter
Voltage/ Phase Motor HP Wire Gauge BX Cable
208-230/1 1 - 1.5 14 3/8"
208-230/3
1/4 - 3 14 3/8"
5 12 3/8"
460/3 1/4 - 5 14 3/8"
575/3 1/2 - 5 14 3/8"
Disconnect
Alternate
Location
Blower
Section
Service
Panel
Furnace
Service
Panel
Optional
Downturn
Plenum
Cabinet
Disconnect
Alternate
Location
Test Gauge
Connection
Gas
Supply Maintain clearance for
burner rack removal.
Electric
Supply
Weatherproof
Disconnect,
Wiring and Connector
FIGURE 26 - Disconnect Switch Locations (Keep electric
and gas supply components clear of service panels.)
WARNING
If you turn off the power supply, turn off the gas. See Hazard
Levels, page 2.
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 times the maximum total input amps.
When installing, be careful that the conduit and switch housing are clear of furnace
panels and inspection plates. Allow at least four feet (1.2M) of service room between
the switch and removable panels. See FIGURE 26 for suggested locations.
Convenience Outlet
Option
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. All wiring to the convenience outlet must meet National Electrical Code
ANSI/NFPA No. 70 (latest edition) and any local or utility codes that apply.
7.0 Electrical
Supply and
Connections
7.1 General
All electrical wiring and connections, including electrical grounding MUST be made in
accordance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or, in
Canada, the Canadian Electrical Code, Part I-C.S.A. Standard C22.1. In addition, the
installer should be aware of any local ordinances or gas company requirements that
might apply.