7
ELECTRICAL CONNECTIONS
WARNING
INJURY OR PROPERTY DAMAGE
Disconnect electrical power before servicing.
Label all wires before disconnecting for service. Wiring errors can
cause improper and dangerous operation.
Verify proper operation after servicing.
CAUTION
PROPERTY DAMAGE
Units with 12 volt connection are for low-voltage battery or direct
current only.
Do not connect to 120 or 240 volts AC.
CAUTION
PROPERTY DAMAGE
This furnace is designed for negative ground 12 volts DC only. DO
NOT attempt to alter furnace for a positive ground system or connect
the furnace directly to 120 OR 240 volts AC.
INSTALLATION AND SAFETY CODES
USA and Canada
– follow all applicable state and local codes in
the absence of local codes or regulations, refer to current
standards of:
ANSI/NFPA 1192 Recreational Vehicles Code and ANSI/RVIA LV
Low Voltage Systems in Conversion and Recreational Vehicles
Conductor Sizing
Table 1
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
Table 2
OVERCURRENT PROTECTION
*Not More Than Seven Wires Per Harness
**Not More Than Three Wires Per Harness
AWG OR SAE
Conductor Size
(Gage)
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
1.
This furnace is designed for negative ground 12 volts DC only. DO
NOT attempt to alter furnace for a positive ground system or connect
the furnace to 120 volts AC. Damage to furnace components will occur
and warranty will be voided.
Use the minimum wire size shown in the table above to minimize
voltage drop. Furnace MUST be installed so electrical components are
protected from water and other installation debris. To make electrical
connections see wiring diagrams.
For best furnace performance when power supply is from a converter
equipped with a charging port, wire converter to furnace in parallel with
battery. This provides consistent voltage to furnace, increasing
component life, filtering power surges and AC spikes.
All units are supplied with a power switch which is to be turned off
during servicing removing power to the furnace wiring. Switch must be
in the ON position for furnace to operate.
Route wiring to the furnace.
Furnace
Power Supply
Red Wire +12 Volt DC
+12 Volt DC
Black Wire -12 Volt DC
-12 Volts (Ground)
Blue Ther12VDC
+12 Volts (Thermostat)
Blue Thermostat
-12 Volts (Thermostat)
1. Wiring for thermostat using 22 AWG minimum stranded wire.
2. All wiring must be installed so the electrical components and
connection are protected from water.
3. If a unit is supplied with a connector block on the field connections
the mating parts should be used.
Furnace Connector
Field Connector
AMP 1-480705-0
AMP 1-480704-0
Furnace Terminals
Field Terminals
AMP 7708496
AMP 770020-1
THERMOSTAT INSTALLATION
Purchase a thermostat rated for 12 VDC or 24 VAC, Minimum 1 AMP
rating.
Be sure all electrical power to the furnace is disconnected.
The thermostats are very sensitive, HANDLE WITH CARE AT ALL
TIMES.
Pick a dry area where air circulation is good.
1.
Do not install the thermostat where there are other heating loads: such
as direct sunlight, heat producing appliances (television, radio, wall
lamp, etc.) furnace or air conditioner output registers.
2.
Locate thermostat 48” to 54” above main living area floor on an
INTERIOR wall when possible.
3.
EXTERIOR wall
location must have a 3/4” spacer between thermostat
and exterior wall for proper room air sensing.
4.
Follow manufacture’s installation instructions provided with thermostat.
OPERATING INSTRUCTIONS
WARNING
FIRE OR EXPLOSION
Do not operate furnace while vehicle is in motion or being towed.
During initial firing of this furnace, a burn-off of excess oils
remaining from manufacturing process may cause smoking or
fumes for 5-10 minutes.
NOTE: if furnace should lock out, the blower will go off in 3
minutes and remain off until unit is reset by reactivating the
thermostat.
STOP! Read Users Information Manual supplied with furnace
.
1.
Turn the manual valve (if so equipped) or the valve at the outside
LP tank to the “OFF” position DO NOT force. NOTE: This furnace
is equipped with a valve shut-
off switch with switch in “OFF”
position. Gas will not flow to burner nor will the furnace operate.
Turn switch to “ON” position.
