22
INSTALLATION
H. Connecting The Electrical
ELECTRICAL SHOCK HAZARD. Failure to obey the following warnings could result in property damage, serious injury,
or death:
• The Furnace must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National
Electrical Code, ANSI/NFPA 70, and/or the Canadian Electrical Code, CSA C22.1, Part 1, if an external electrical source is utilized.
• The Furnace MUST be installed so that electrical components are protected from water and other installation debris.
• If the Furnace model is designed for negative ground 12 VDC only, do NOT attempt to alter Furnace for a positive ground
system or connect a 12 VDC Furnace to 120 VAC or 240 VAC. Furnaces with 12 VDC connection are for low-voltage battery
or direct current only.
• Do NOT "Hi Pot" the Furnace unless the electronic ignition system (circuit board) has been disconnected.
• Do NOT use a battery charger to supply power to a DC model Furnace even when testing.
• Do NOT use 120 VAC current with VDC models. Do NOT use 12 VDC current with 120 VAC models.
• The direct high voltage spark ignition of the Furnace generates a radio frequency that may cause interference with other
microprocessor-based equipment. Locate any equipment at least five feet from the Furnace location.
Overcurrent Protection (No Wire Bundling Restrictions)
WIRE SIZE AMPACITY WIRE TYPE
20 3 Stranded Only
18 6 Stranded Only
16 8 Stranded Only
14 15 Stranded Only
12 20
Stranded Only
10 30
Stranded Only
8 40
Stranded Only
6 55
Stranded Only
4 75
Stranded Only
2 100
Stranded Only
Wiring Information
• To route wiring to the Furnace refer to the “Wiring
Diagrams” on page 23.
• Use the smallest wire size shown in the table to minimize
voltage drop.
• If power is supplied from a converter that is equipped with
a charging port, wire the converter to the Furnace at the
same time as the battery.
• If a Furnace is supplied with a connector block on the field
connections, use the mating parts.
• All Furnaces have a power switch to turn the Furnace off for
servicing. Confirm the switch is in the ON position.
Additional Information For VAC Wiring Only
• Furnaces equipped with 120 VAC motors use power from a
24 VAC transformer inside the Furnace to power electrical
component parts.
• The power switch for VAC Furnaces is located in the valve
circuit leg only.
• Use a minimum of 18 GA wire to route 120 VAC and
thermostat leads to wires located on the le side of the
control box.
Overcurrent Protection
AWG OR SAE
CONDUCTOR
SIZE
MAXIMUM AMPACITY
AT CONDUCTOR
INSULATION
TEMPERATURE
RATING OF 90°
MAXIMUM AMPACITY
AT CONDUCTOR
INSULATION
TEMPERATURE
RATING OF
105 °C/ 125 °C
20* 5 7.5
18* 7.5 10
16* 10 15
14* 17.5 20
12* 22.5
25
10** 40
50
8** 55
70
6** 75
100
4** 95
120
2** 130
150
1** 150 -
1/0** 170 -
2/0** 195 -
3/0** 225 -
4/0** 260 -
* Not more than seven wires per harness; **Not more than three
wires per harness
A 15-amp circuit breaker is provided with the DFMD35,
DFLD35, and DFLD40 Furnace models. Install the breaker
inside the main fuse panel in place of a normal fuse for the
RV. Place the circuit breaker in the “Furnace Only Circuit”.
To Next Page
Loading...
Need help?
General
