0 electrical supply and wiring – Reznor RDF Unit Installation Manual User Manual

Page 17

I-RDF, PN148384R5, Page 17

7.0 Electrical

Supply and

Wiring

All electrical wiring and connections including electrical grounding must be in accor-

dance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or the Cana-

dian Electrical Code Part 1-C.S.A. Standard C22.1. Check any local ordinances or

utility company requirements that apply.
Run a separate line voltage supply directly from the building electrical panel to the dis-

connect switch for the system. All external wiring must be within approved conduit and

have a minimum temperature rise rating of 60°C. For motor load amps, see Paragraph

6.4 or check the motor nameplate. System FLA is on the rating plate.
Specific wiring diagrams and complete instructions are packed with each unit and

should be kept readily accessible in legible condition.

Wire Gauge - 100 ft (30M) maximum

Full Load Amps 5 10 15 20 25 30 35 40

Wire Gauge

14 14 12 10 8 8 6 6

Convenience Outlet

Option

CAUTION: If any of the original wire in the unit must be replaced, the replacement

wire must have a temperature rating of at least 105°C except for controls mounted in

the discharge airstream which must be 150°C. See Hazard Levels, page 2.

When a convenience outlet option is included, an individual 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) or the Canadian Electrical Code Part 1-C.S.A. Stan-

dard C22.1. and any local or utility codes that may apply.

Disconnect Switch

A safety disconnect is required. Refer to

FIGURE 14 for recommended location and

install the disconnect switch in accordance with Article 430 of the National Electrical

Code ANSI/NFPA 70 or in accordance with Canadian Electrical Code Part 1-C.S.A.

Standard C22.1. When attaching the disconnect switch to the heater, use hardware

with "teeth" to provide electrical grounding. The "teeth" should face the disconnect

switch, scratching off the painted surface. Attach the disconnect tightly against the

heater cabinet. Run cable so that it does not interfere with cabinet panels or doors.

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.

Control Wiring

A 7/8" diameter opening suitable for watertight conduit connection is provided as the

entrance of 24-volt control wiring to the electrical compartment. For location, see

FIG-

URE 14, page 18. Low voltage wiring must be in individual conduit, separated from

primary high voltage wiring.

Volts

Wire Gauge

Total Wire Length

Distance from Unit to Control

Control Wiring Maximum Lengths (ft)

150

250

125

350

175

Control Wiring Maximum Lengths (M)

45.7

22.9

76.2

38.1

106.7

53.3

CAUTION: Supply voltage and 24-volt control wiring cannot be installed in the same

conduit. Maxitrol systems will be adversely affected if control wiring is in conduit

with supply voltage wiring. If required, field-supplied wiring between any Maxitrol

components must be completed with shielded wiring.

A 3-position control switch mounted in a 4x4 box is supplied with each system (excep-

tion - not included with systems with Option AG37 designed for computer control),

either packed loose inside the unit, or if an optional control console (Option RC13 or

RC14; See

FIGURE 15) is ordered, the switch is mounted on the console.

Control wiring requirements depend on the options selected. Follow the custom wiring

diagram supplied with the system to connect any remote controls. In this paragraph,