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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 volts AC. Damage to furnace components
will occur and warranty will be voided.
Use the minimum wire size show in the table above to minimize
voltage drop. Furnace must be installed so electrical components are
protected from water. To make electrical connections see attached
wiring diagram specific to furnace model.
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.
Some models are shipped with a field harness connections with 12"
wire leads. An optional field harness with a double end is available in
bulk. This harness contains 12" leads, four-pin housing, and standard
six-pin housing.
All units are supplied with a power switch which when turned off during
servicing will remove power through furnace wiring. Switch must be on
in the ON position for furnace to operate.
The direct high voltage spark ignition generates a radio frequency that
could cause interference with other microprocessor-based equipment.
Locate equipment at least five feet (5') from furnace location. If this
distance cannot be maintained, Atwood has a kit which can be
purchased. See parts list.
Route wiring to the furnace.
Furnace
Red Wire +12 Volt DC
Black Wire -12 Volt DC
Blue Thermostat +12VDC
Blue Thermostat
1.
Wiring for thermostat using 22 minimum AWG 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
AMP 1-480705-0
Furnace Terminals
AMP 7708496
120 VOLT AC WIRING
Furnaces are equipped with a 120 volts AC motor. All other
electrical component parts are supplied with power from a
transformer inside the furnace at 24 volts AC.
A 120 Volt model can also be supplied with a 30 inch power cord
from the factory supplied with a molded plug with ground pin.
AC units have a power switch located in the valve circuit leg only.
This switch will not remove the power from the 120 volts incoming
line. Make sure that power has been turned off before servicing.
Switch must be in the "ON" position for the furnace to operate the
valve.
PROPERTY DAMAGE
This furnace is designed for 120 volts AC only. DO NOT attempt to
alter furnace system or connect to 12 volts DC.
Route 120 volts AC and thermostat leads to wires located on the left
side of control box using a minimum of 18 GA wire. The furnace must
be installed so electrical components are protected from water. To
make electrical connections see wiring diagram.
1.
Route wiring to left side of furnace.
2.
Remove junction box cover (some units come with pre-wired
cords for connection directly to a 120 volts AC outlet).
3.
Connect 120 white wire to furnace 120 white wire.
4.
Connect 120 black wire to furnace 120 black wire.
Power Supply
+12 Volt DC
-12 Volts (Ground)
+12 Volts (Thermostat)
-12 Volts (Thermostat)
Field Connector
AMP 1-480704-0
Field Terminals
AMP 770020-1
CAUTION
5.
Connect ground wire to furnace green ground wire (after
connections are made put wire connections into furnace junction
box and replace cover).
6.
Connect thermostat leads to the two blue furnace thermostat
leads using minimum 22-18 GA stranded wire.
.
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
3.
INTERIOR wall when possible
EXTERIOR wall location must have a 3/4" spacer between
4.
thermostat and exterior wall.
Follow manufacture's installation instructions provided with
5.
thermostat.
OPERATING INSTRUCTIONS
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.
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,
go to shut down 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. 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.
5.
Set thermostat level 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 which
automatically lights the burner. DO NOT try to light the burner by
hand.
7.
If burner does not light, repeat Steps 1 through 7.
8.
If after three (3) attempts with no ignition, go to shut down 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. 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.
8
WARNING
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