Desa FVFM27NR/PR - Manual (Page 18)

108382-01E
18
For more information, visit www.desatech.com For more information, visit www.desatech.com
1. Shut off the unit, including the pilot. Allow the unit to cool for
at least thirty minutes.
2. Inspect burner, pilot, and primary air inlet holes on injector
holder for dust and dirt (see Figure 32).
3. Blow air through the ports/slots and holes in the burner.
4. Check the injector holder located at the end of the burner tube
again. Remove any large particles of dust, dirt, lint, or pet hair
with a soft cloth or vacuum cleaner nozzle.
5. Blow air into the primary air holes on the injector holder.
6. In case any large clumps of dust have now been pushed into
the burner repeat steps 3 and 4.
Clean the pilot assembly also. A yellow tip on the pilot flame
indicates dust and dirt in the pilot assembly. There is a small pilot
air inlet hole about two inches from where the pilot flame comes out
of the pilot assembly (see Figure 33). With the unit off, lightly blow
air through the air inlet hole. You may blow through a drinking straw
if compressed air is not available.
LOGS
• If you remove logs for cleaning, refer to Installing Logs, page
13, to properly replace logs.
• Replace log(s) if broken or chipped (dime-sized or larger).
CLEANING AND
MAINTENANCE
Continued
Figure 33 - Pilot Inlet Air Hole
Burner Tube
Pilot Assembly
Pilot Air
Inlet Hole
Ports/Slots
Figure 32 - Injector Holder On Outlet Burner Tube
Primary Air Inlet Holes
(Shape of Holes May
Vary by Model)
CLEANING AND MAINTENANCE
Cleaning Burner Injector Holder And Pilot Air Inlet Hole
Logs
WIRING DIAGRAM
SPECIFICATIONS
SERVICE HINTS
TECHNICAL SERVICE
Burner
Tube
Injector Holder
(May Be Brass or
Aluminum Depend-
ing on Model)
SPECIFICATIONS
Natural Gas Propane/LP
Btu (Variable) 20,000/39,000 20,000/39,000
Type Gas Natural Gas Only Propane/LP Only
Ignition Piezo Piezo
Pressure Manifold 3.5" W.C. 8.0" W.C.
Inlet Gas Pressure (in. of water)
Maximum 10.5" 14"
Minimum* 5" 11"
Shipping Weight 32 lbs. 32 lbs.
* For input adjustment
SERVICE HINTS
When Gas Pressure Is Too Low
• pilot will not stay lit
• burners will have delayed ignition
• heater will not produce specified heat
• propane/LP gas supply may be low
You may feel your gas pressure is too low. If so, contact your local
natural or propane/LP gas supplier.
TECHNICAL SERVICE
You may have further questions about installation, operation, or
troubleshooting. If so, contact DESA Heating Products’ Technical
Service Department at 1-866-672-6040. When calling please have
your model and serial numbers of your heater ready.
You can also visit DESA Heating Products’ technical services web
site at
www.desatech.com.
WIRING DIAGRAM
Note: For proper operation of optional accessories, the wires from
the switch to the control must be connected exactly as shown.
AUT
O
OF
F ON
Thermopile