7
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
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 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 that 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)
Wiring for thermostat using 22 AWG minimum stranded wire.
All wiring must be installed so the electrical components and
connections are protected from water.
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.
1.
Pick a dry area where air circulation is good.
2.
Do not install the thermostat where there are unusual heating
conditions: such as direct sunlight, heat producing appliances
(television, radio, wall lamp, etc.) or a furnace or air conditioner output
registers.
Locate thermostat 48” to 54” above main living area floor on an
INTERIOR wall when possible
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 90 seconds
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.
2.
Set thermostat above room temperature to begin blower operation. A
slight delay will occur before the blower comes on. Allow blower to run
for 1 minute for combustion chamber purge cycle. If blower does not
come on or stops before ignition cycle, shut down unit and contact your
dealer or a local recreational vehicle service agency.
3.
After 1 minute, move thermostat lever below room temperature.
Blower will remain on. Wait approximately 2 minutes for blower to
go off.
4.
Open manual shut-off valve (if so equipped) or the valve at the
outside LP tank. Correct operation characteristics depend on the
valve being positioned fully open. Never attempt to operate with a
valve partially closed.
5.
Set thermostat lever to desired setting. If set above room
temperature, blower will come on.
6.
Allow 30 seconds for main burner to light after blower comes on.
This furnace is equipped with an ignition device that automatically
lights the burner. DO NOT try to light the burner by hand.
7.
If burner does not light, repeat Steps 1 through six.
8.
If after three (3) attempts with no ignition, shut down the unit and
contact your dealer or a local recreational vehicle service agency.
Do not continue to cycle furnace through thermostat in an attempt
to get ignition.
TO SHUT DOWN UNIT
1.
Set the
thermostat to lowest setting, then move lever to “OFF”
position.
2.
Turn manual shut off valve (if so equipped) to the “OFF” position.
Do not force.
IGNITION CONTROL DIAGNOSTIC CODES
The following charts give the diagnostic codes given by the ignition
control when faults are present.
A soft lockout is a timed condition that will make additional
attempts to correct the problem. A hard lookout requires resetting
of the thermostat or turning the power switch off, then back on.
Standard 3 tries for Ignition Controls
DIAGNOSTICS CHART
FAULT
LED INDICATION
LOCKOUT
Internal Circuit Board
Failure
Steady On, No Flashing
Hard
Limit Switch/Airflow
Problems
1-Flash With 3-Second
Pause
Soft
Flame Sense Fault
2-Flashes With 3-Second
Pause
Hard
Ignition Lockout Fault
3-Flashes With 3-Second
Pause
Soft (1 hr. retry)
EXTERIOR wall location MUST have a 3/4
” spacer between
thermostat and exterior wall.
Follow manufacture’s installation instructions provided with
thermostat.
