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38
SERVICING HSG SERIES BURNER
(SERVICE TECHNICIAN ONLY)
A. BURNER HEAD AND ELECTRODE/SENSOR ASSEMBLY
The burner head, electrode, sensor probe, combination valve, orifice housing and housing cover are
part of the gas train assembly which can be removed as one unit (see Figure 23).
1. Disconnect the gas supply line from the combustion gas valve inlet; disconnect flame sensor lead wire
from gas primary, gas valve lead wires from gas valve operator and (orange) ignition lead wire from
ignition transformer ignition lead wire.
2.
Remove the two 1/4” hex slotted screws on the top front of the housing cover and the two 5/16” hex
slotted screws on the left and right side back of the housing cover.
3. To remove gas train assembly, gently lift up rear of housing cover pulling rearward slightly on the
drawer assembly gradually positioning the rear of the drawer assembly upward 90 degrees. Gently extract
burner head and electrode/sensor assembly out of opening in housing taking extreme care to not dislocate
or damage igniter electrode or flame sensor.
4. When servicing, clean burner head ports, igniter electrode and flame sensor. Inspect the flame sensor
and electrode wires and porcelain insulators carefully for hairline cracks which will degrade performance.
Replace as necessary.
5. Examine the igniter electrode and flame sensor for any serious corrosion or deterioration of metal at
the tips. Check for proper dimensional settings of the flame sensor and electrode (See Figure 21). Adjust
and/or replace these assemblies as necessary. Make sure that the ignition and sensor probe wires go to
the correct electrodes and the ignition wire boot is in place over the electrode porcelain.
6. Make sure that the burner tube end is properly positioned in the combustion chamber entry. It must be
set 1/8
” (3.2 mm) short of the inside face of the combustion chamber as shown in Figures 6, 7, 8.
B. AIR PROVING SWITCH
The air proving switch is mounted to the housing cover with (2) #6 self-tapping screws under the gas valve.
A clear plastic tube, protected by a spring cover, is connected to the barbed fitting on the pressure switch
while the other end is connected to a brass barbed fitting. The plastic tube allows pressurized air from the
blower housing to travel to the pressure switch causing diaphragm contacts to close thus completing the
circuit.
The function of the air proving switch is to ensure combustion air is being developed by the blower motor
and blower wheel. Should the blower motor fail or the blower wheel malfunction, the burner gas valve will
shut off.
1. The air proving switch should never require maintenance. However, should nuisance lockouts occur,
the pressure switch can be checked.
This is done by disconnecting the yellow and white leads from the Air
Proving switch and jumpering the leads together. If the burner functions correctly, the switch needs to be
replaced.
BURN HAZARD, HOT SURFACE
Burner flange and air tube are hot when burner is in operation. Do not
service this area during or immediately after operation. Allow area to
cool.
ELECTRICAL SHOCK HAZARD
Make sure the main manual gas valve, manual control knob on the
combination valve and electrical supply are turned off before opening
burner or removing any parts for service.
Summary of Contents for HSG200
Page 30: ...30 Figure 20 Flame Current Measurement Top Wayne control Bottom Honeywell control...
Page 48: ...48 Figure 29 continued Junction Box Assemblies Exploded Figure 30 Motor Assembly Exploded...
Page 49: ...49 Figure 31 Gun Assembly Exploded Figure 32 HSG Series Burner Exploded...
Page 52: ...52 NOTES...