Dometic DF Serie Instructions D'installation page 22

INSTALLATION
H. Connecting The Electrical
 Failure to obey the following warnings could result in property damage, serious injury, or death:
• ELECTRICAL SHOCK HAZARD:
• 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
20
18
16
14
12
10
8
6
4
2
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 left side of the
control box .
WIRE TYPE
3 Stranded Only
6 Stranded Only
8 Stranded Only
15 Stranded Only
20 Stranded Only
30
Stranded Only
40 Stranded Only
55
Stranded Only
75 Stranded Only
100
Stranded Only
Overcurrent Protection
MAXIMUM AMPACITY
AWG OR SAE AT CONDUCTOR
CONDUCTOR INSULATION
SIZE TEMPERATURE
RATING OF 90°
20*
18*
16*
14*
12*
10**
8**
6**
4**
2**
1**
1/0**
2/0**
3/0**
4/0**
* 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" .
22
MAXIMUM AMPACITY
AT CONDUCTOR
INSULATION
TEMPERATURE
RATING OF
105 °C/ 125 °C
5 7 .5
7 .5
10
17 .5
22 .5
40
55
75
100
95
120
130
150
150
170
195
225
260
10
15
20
25
50
70
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