Testing - Dometic DFSAD12 Installation Instructions Manual

INSTALLATION
I. Installing The Thermostat
 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 . Failure to follow these instructions could
result in serious injury or death .
Read BEFORE proceeding:
• Wire the thermostat using 22 AWG minimum stranded wire .
• Purchase a thermostat rated for 12 VDC or 24 VAC, Minimum 1 AMP rating .
• Disconnect all electrical power to the Furnace .
• Locate a dry area away from the heat registers with good air circulation for the thermostat installation .
• Place the thermostat 48"– 54" above the main living area floor on an INTERIOR wall, when possible .
• Use a 3/4" spacer between the thermostat and wall, for proper room air sensing when placing on an EXTERIOR wall .
• Follow manufacturer's installation instructions provided with the thermostat .

TESTING

A. Testing The Furnace
 Do NOT operate the Furnace while the vehicle is in motion or being towed .
FIG. 1
Testing The Operation
1 . Turn the manual valve (if equipped) or the valve at the outside LP tank to the OFF position . Do NOT force .
This Furnace is equipped with a power switch . Gas will not flow to the burner, and the Furnace will not operate with the power
switch in the OFF position .
2 . Turn the power switch to the ON position .
This Furnace is equipped with an ignition device which automatically lights the burner . Do NOT light the burner by hand .
3 . Set the thermostat above room temperature to begin blower operation . A slight delay will occur before the blower begins
running .
4 . Allow the blower to run for 15 seconds to complete the combustion chamber purge cycle .
• If the blower does not come on or stops before the ignition cycle, shut down the Furnace and contact your dealer or a local
RV service agency .
5 . Move the thermostat lever below room temperature .
6 . Wait approximately 90 seconds for the blower to stop running .
7 . Open the manual shut off valve (if equipped) or the valve at the LP tank . Correct Furnace operation depends on the valve being
fully open . Never attempt to operate with a valve partially closed .
8 . Turn the shut off switch to the ON position .
9 . Set the thermostat lever to the desired setting . If set above room temperature, the blower begins running .
10 . Allow 15 seconds for the main burner to light after the blower begins running .
• If the burner does not light, confirm the gas is ON and repeat steps by resetting the thermostat to purge any air in the gas system .
• If after three attempts there is no ignition, shut down the Furnace and contact your dealer or a local recreational vehicle
service agency . Do NOT continue to cycle the Furnace through the thermostat in an attempt to get ignition .
Shutting Down The Furnace
1 . Set the thermostat to the lowest setting, then turn to the OFF position .
2 . Turn the manual shut off valve at the LP tank (if equipped) to the OFF position . Do NOT force the valve .
3 . At the exterior access panel, turn the valve shut-off switch to the OFF position .
(Small Vent Models)
Power
Switch
FIG. 2
24
(Door Models)
*Power
Switch
*Switch is located behind door