Service manual
37
Table 13 –Air Box Settings at Full Fire
MODEL
AIR BOX “ W.C. (with burner firing)
Burner
#1
Burner
#2
Burner
#3
Burner
#4
2000
1.9
(2.2)
1.9
(2.2)
2500
1.5
(1.8)
1.5
(1.8)
1.5
(1.8)
3000
1.9
(2.2)
1.9
(2.2)
1.9
(2.2)
3500
1.6
(1.9)
1.6
(1.9)
1.6
(1.9)
1.6
(1.9)
4000
1.9
(2.2)
1.9
(2.2)
1.9
(2.2)
1.9
(2.2)
MODEL
FLUE SWITCH RECYCLE POINT “
W.C
Burner
#1
Burner
#2
Burner
#3
Burner
#4
2000
1.5
(1.9)
1.5
(1.9)
2500
1.1
(1.5)
1.1
(1.5)
1.1
(1.5)
3000
1.5
(1.9)
1.5
(1.9)
1.5
(1.9)
3500
1.2
(1.6)
1.2
(1.6)
1.2
(1.6)
1.2
(1.6)
4000
1.5
(1.9)
1.5
(1.9)
1.5
(1.9)
1.5
(1.9)
Depending on field conditions air box pressures
will have to be adjusted accordingly. Always set
the appliance for a CO
2
level in the range listed
in Table 14.
Table 14: Combustion Values
Natural Gas
Propane
CO
2
CO CO
2
CO
Non-
Condensing
Max.
Fire
7.5% -
8.5%
< 50
PPM
9.0% -
10.0%
< 50
PPM
Min.
Fire
7.0% -
7.5%
< 50
PPM
8.5% -
9.0%
< 50
PPM
Condensing
Max.
Fire
8.5% -
9.0%
< 50
PPM
10.0% -
10.5%
< 50
PPM
Min.
Fire
7.5% -
8.0%
< 50
PPM
9.0% -
9.5%
< 50
PPM
A qualified service technician should follow this
procedure when burner needs cleaning.
1. Shut off power and close main manual
gas valve.
• Allow burner to cool before removal.
2. Remove access cover screws.
• Disconnect pilot gas at bulkhead
fitting.
• Disconnect ground wire and ignition
wire.
• Remove nuts holding down burner.
• Gently pull down and forward to
disengage burner.
• Remove burner being careful to not
damage the igniter or ground
electrodes.
3. Thoroughly clean burner using low
pressure water or air. Never wipe or
brush the surface of the burner nor use
high pressure water or air. Check all
ports and air channels for blockage.
4. Reinstall the burner being careful to fully
engage the back of the burner box into
the retaining slot in the combustion
chamber base. Failure to properly locate
the burner will result in erratic flame
operation with the possibility of delayed
ignition on light off.
5. Restore electrical power and gas supply
to the appliance.
• Following the lighting instructions
put the appliance back into
operation
• Check for gas leaks and proper
appliance and vent operation.