Reznor HRPD, Installation, Operation And Maintenance Manual

21

RP-HRPD-IOM (07-22) 132210-B

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 limit control, 

optional bypass damper combustion air safety circuit (option AG39, AG40, AG41, or AG42), and 

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 .

• 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 .

Control Wiring

•

Refer to 

Table 14

 for amp ratings of optional controls . Refer to 

Table 15

 for the recommended maximum length 

and minimum gauge of control wiring .

Table 14.  Amp Ratings of 24V Optional Controls

Control

Ampere Rating (Maximum Amps)

Fan control

0 .12

Time delay relay heater

0 .10

Relay coil

0 .12

Spark ignition system

0 .10

Maxitrol gas control system

0 .50

Single-stage gas valve

0 .60

Two-stage gas valve

0 .60

NOTE: 24V transformer has 20VA capacity .

Table 15.  Control Wiring Sizes

Distance from Unit to Control

(Feet (Meters))

Minimum Recommended Wire Gauge

(AWG)

Total Wire Length 

(Feet (Meters))

75 (23)

#18

150 (46)

125 (38)

#16

250 (76)

175 (53)

#14

350 (107)