Installation manual

111285-01A
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For more information, visit www.desatech.com
20
CLEANING AND
MAINTENANCE
Continued
Figure 42 - Pilot Inlet Air Hole
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 42). 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.
Burner
Tube
Pilot
Assembly
Pilot Air
Inlet Hole
Ports/Slots
LOGS
• If you remove logs for cleaning, refer to Installing Logs, page
14, to properly replace logs.
• Replace log(s) if broken or chipped (dime-sized or larger).
BURNER PRIMARY AIR HOLES
Air is drawn into the burner through the holes in the fitting at the
burner entrance. These holes may become blocked with dust or lint.
Periodically inspect these holes for any blockage and clean if
needed. Blocked air holes will create soot.
MAIN BURNER
Periodically inspect all burner flame holes with the heater running. All
slotted burner flame holes should be open with yellow flame present.
All round burner flame holes should be open with a small blue flame
present. Some burner flame holes may become blocked by debris or
rust, with no flame present. If so, turn off heater and let cool. Remove
blockage, blocked burner flame holes will create soot.
CLEANING AND MAINTENANCE
Cleaning Burner Injector Holder And Pilot Air Inlet Hole (Cont.)
Logs
Burner Primary Air Holes
Main Burner
WIRING DIAGRAMS
SPECIFICATIONS
WIRING DIAGRAMS
Note : For proper operation of optional accessories, the wires from
the switch to the control must be connected exactly as shown in
Figure 43.
A
U
T
O
O
F
F
O
N
Thermopile
Figure 43 - Switch Wiring Diagram
Red
Variable
Fan Switch
Fan Switch
(N.O.)
Green
White
On
110/115
V.A.C.
Blower
Motor
Black
Off
1
2
Black
Blue
Figure 44 - Blower Wiring Diagram
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
SPECIFICATIONS
VI33NR VI33PR
Btu (Variable) 20,000/30,000 20,000/30,000
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"
* For input adjustment