Suburban SF-25FQ User Manual

4. The motor is permanently lubricated and requires no oiling.
5. Keep the furnace area clear of any combustible materials, gasoline or other
ammable vapor and liquids.
6. Before operating furnace, check the location of the furnace vent to make sure
it will not be blocked by the opening of any door on the trailer. If it can be
blocked, do not operate the furnace with the door open.
7. Do not restrict the ow of combustion air or the warm air circulation to the
furnace. To do so could cause personal injury and/or death.
8. Never operate the furnace if you smell gas. Do not assume that the smell
of gas in your RV is normal. Any time you detect the odor of gas, it is to
be considered life threatening and corrected immediately. Extinguish any
open ames including cigarettes and evacuate all persons from the vehicle.
Shut off gas supply at LP gas bottle. (See safety notice on front cover of this
manual.)
9. Immediately shut furnace down and call a service agency if furnace cycles
erratically or delays on ignition.
WARNING! Should overheating occur, or the gas supply fail to shut off, shut off the
manual gas valve to the appliance before shutting off the electrical supply.
10. Never attempt to repair damaged parts. Always have them replaced by a
qualied service agency.
11. Never attempt to repair the furnace yourself. Seek the help of a qualied
service person.
12. Never restrict the ducting installed by your trailer manufacturer. To do so
could cause improper furnace operation.
13. Do not install air boosters in the duct system. Such devices will cause the
furnace to cycle and to have erratic sail switch operation.
14. Clothing or other ammable material should not be placed on or near the
appliance.
15. Always follow the operating instructions. Do not deviate from the step-by-step
procedures.
16. Do not use this appliance if any part has been submerged under water.
Immediately call a qualied service technician to inspect the appliance and
to replace any part of the control system and any gas control that has been
submerged under water.
17. When considering add-on rooms, porch or patio, attention must be given to
the venting of your furnace. For your safety, do not terminate furnace vent
inside add-on rooms, screen porch or onto patios. Doing so will result in
products of combustion being vented into the room or occupied areas.
18. In any installation in which the vent of this appliance can be covered due to
the construction of the RV or some special feature of the RV such as slide out,
pop-up, etc. always insure that the appliance cannot be operated by setting
the thermostat to the positive “OFF” position and shutting off all electrical and
gas supply to the appliance. Never operate furnace with vent covered.
INSTALLATION AND REMOVAL OF UNIT
TO REMOVE
1. Disconnect power supply at furnace.
2. Remove vent cap assembly.
3. Disconnect gas connections.
4. Remove cabinet front (2 screws).
5. Remove tie-down screw from center of unit and remove furnace from cabinet.
TO INSTALL
1. Slide unit into cabinet. NOTE: Care must be taken in routing wiring to back of
cabinet and outside of cabinet.
2. Reinstall tie-down screw, securing chamber assembly to cabinet.
3. Reinstall cabinet front.
4. Connect gas line.
5. Check gas connections for leaks using a soap and water solution. Correct any
gas leaks immediately.
6. Reinstall vent cap assembly.
7. Reconnect power supply.
OPERATING INSTRUCTIONS
WARNING! Do not operate furnace while vehicle is in motion or being towed.
NOTE: During initial ring of this furnace, a burn-off of excess paint and oils
remaining from manufacturing process may cause “smoking” for 5 - 10 minutes.
1. STOP! Read Users Information Manual supplied with furnace.
2. Turn the manual valve (if so equipped) or the valve at the outside LP tank to
the “OFF” position. Do not force.
3. Set thermostat above room temperature to begin blower operation. A slight
delay will occur before the blower comes on. Allow blower to run for 5 minutes
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.
4. After 5 minutes, move thermostat lever below room temperature. Blower will
remain on. Wait approximately 2 minutes for blower to go off.
5. Open manual shut-off valve (if so equipped) or the valve at the outside LP
tank. Correct operating 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 ow to burner nor will the furnace operate.
6. Set thermostat lever to desired setting. If set above room temperature, blower
will come on.
7. 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.
8. If burner does not light, repeat Steps 1 through 8.
9. 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 5 minutes and remain off until unit is
reset by reactivating thermostat.
TO SHUT DOWN
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.
ELECTRODE ADJUSTMENT
For consistent ignition of the burner, it is important that the electrode be positioned
properly over the top of the burner. The electrode was set at the factory for proper
ignition and should not need further adjustment; however, if you should experience
inconsistent ignition, reposition electrode as follows:
Equipment needed:
ashlight • black felt-tip pen • needle-nose pliers • measuring tape
NOTE: Furnace must be removed. (See instructions for removing unit.)
1. Remove burner from combustion chamber by removing six (6) screws which
attach the burner to the chamber and air bafes (plates).
2. Locate the lance in relation to the burner ports for electrode positioning by:
a. Shine a ashlight into the burner venturi as illustrated. (Be sure ashlight
lens is against the end of the burner.)
b. Light will reect off the lance in the venturi of the burner and shine through
a portion of the two (2) rolls of burner ports in the top of the burner.
c. Using a black felt-tip pen, mark a line along top of burner 3/16” in back of
the lance and parallel with lance. Make an additional mark indicating the
center line of the lance. (See illustration.) Both marks will be used later as
reference marks; therefore, keep lines thin.
3. Reassemble the burner.
4. Adjust electrode so the electrode probe is positioned along the marked center
line of the burner lance and the tip of the electrode terminates 3/16” from the
back of the lance. (At the line marked in Step 2-c.) (See Figure 4.)
5. IMPORTANT: Be sure electrode probe maintains a 1/8” spark gap over the
burner as illustrated.
6. Reinstall the furnace into the cabinet following the instructions in the manual.
PARTS AND SERVICE
Contact a conveniently located recommended Suburban Service Center.
Describe to them the nature of your problem, make an appointment, if necessary,
and provide for delivery of your RV with the appliance installed.
To obtain information on locating a local service agency, contact:
AIRXCEL, Inc., Suburban Division
Customer Service Department
676 Broadway Street
Dayton, TN 37321
(423) 775-2131 Ext. 7101
www.AIRXCEL.com
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Suburban SF-25FQ Specifications

General

Brand	Suburban
Model	SF-25FQ
Category	Furnace
Language	English