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9.3
9.2
9.0
8.9
8.7
8.5
8.3
8.1
NATURAL GAS
MAINTENANCE
PERIODIC SERVICE
3. Remove service access panel.
4. To clean or replace the burner, remove retainer from
around manifold orifi ce, disconnect fl ame sensor and
igniter from control board, remove burner assembly
mounting screws. See Figure 25.
5. With the burner removed, wire brush the inside
surfaces of the heat exchanger.
6. Remove any dirt, dust, or other foreign matter from
the burners using a wire brush and/or compressed
air. Ensure that all parts are unobstructed.
7. Reassemble the unit heater by replacing all parts in
reverse order.
8. Complete the appropriate unit startup procedure as
given in the “Operation” section of this manual. (See
lighting instruction on the unit nameplate).
9. Check the burner adjustment.
10. Check all gas control valves and pipe connections
for leaks.
11 Check the operation of the automatic gas valve
by lowering the setting of the thermostat, stopping
the operation of the gas unit heater. The gas valve
should close tightly, completely extinguishing the
fl ame on the burner.
12. Inspect and service motor/fan assembly. To maintain
efficient air flow, inspect and clean the fan blades
and guard to prevent buildup of foreign matter.
13. Check lubrication instructions on motor. If oiling is
required, add 3 or 4 drops of electric motor oil as
follows:
a. Light Duty - After 3 years or 25,000 hours of
operation.
b. Average Duty - Annually after 3 years or 8,000
hours of operation.
c. Heavy Duty - Annually after 1 year or at least
1500 hours of operation.
Never over oil the motor or premature
failure may occur!
14. Check and test the operational functions of all safety
devices supplied with your unit.
Manifold
Pressure
(In. W.C.)
*Heating
Value
BTU/Cu. ft.
1,927
1,891
1,853
1,817
1,781
1,745
1,709
1,673
3.2
3.1
3.1
3.1
3.0
2.9
2.9
2.8
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
802
787
771
756
741
726
711
696
Manifold
Pressure
(In. W.C.)
PROPANE (LP) GAS
*Heating
Value
BTU/Cu. ft.
Altitude
(Feet)
Table 8
Manifold
Pressure
(In. W.C.)
*Heating
Value
BTU/Cu. ft.
10.0
10.0
10.0
10.0
10.0
9.9
9.7
9.6
9.5
2,278
2,237
2,196
2,156
2,116
2,077
2,039
2,000
1,964
3.5
3.5
3.5
3.4
3.4
3.4
3.3
3.3
3.2
2,000
2,500
3,000
3,500
4,000
4,500
5,000
5,500
6,000
948
931
914
897
881
865
849
833
818
Manifold
Pressure
(In. W.C.)
PROPANE (LP) GASNATURAL GAS
*Heating
Value
BTU/Cu. ft.
Altitude
(Feet)
*Notes:
1. Consult local utility for actual heating value.
2. Tables based on heating value of 1,050 BTU/Cu. ft. at sea level.
NOTICE: The heater and vent system should be
checked once a year by a qualifi ed technician.
All Maintenance/Service information should be recorded
accordingly on the Inspection Sheet provided in this
manual.
Open all disconnect switches
and disconnect all electrical and gas supplies
and secure in that position before servicing unit.
Failure to do so may result in personal injury or
death from electrical shock.
Gas tightness of the safety shut-
off valves must be checked on at least an annual
basis.
To check gas tightness of the safety shut-off valves, turn
off the manual valve upstream of the appliance combination
control. Remove the 3/32 hex head plug on the inlet side
of the combination control and connect a manometer to
that tapping. Turn the manual valve on to apply pressure
to the combination control. Note the pressure reading on
the manometer, then turn the valve off. A loss of pressure
indicates a leak. If a leak is detected, use a soap solution
to check all threaded connections. If no leak is found,
combination control is faulty and must be replaced before
putting appliance back in service.
Should maintenance be required, perform the following
inspection and service routine:
1. Inspect the area near the unit to be sure that there is
no combustible material located within the minimum
clearance requirements listed in this manual.
Under no circumstances should
combustible material be located within the
clearances specified in this manual. Failure to
provide proper clearance could result in personal
injury or equipment damage from fi re.
2. Turn off the manual gas valve and electrical power
to the unit heater.