Sterling QVSB - Manual (Page 19)

19
MAINTENANCE
PERIODIC SERVICE
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 1/8 inch pipe 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 mini-
mum clearance requirements listed in this manual.
Under no circumstances should
combustible material be located within the
clearances specifi ed 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 gas unit heater.
3. To clean or replace the main burners, remove the
bottom panel and compress the spring by moving
the burner toward the manifold. Slide the opposite
end of the burner downward from the locating slot
while retaining spring is still compressed. Pull the
burners away from the heat.
4. With the burners removed, wire brush the inside
surfaces of the heat exchanger.
5. 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. Inspect
and clean pilot burner if necessary.
6. Reassemble the gas unit heater by replacing all
parts in reverse order.
7. Complete the appropriate unit start-up procedure as
given in the “Operation” section of this manual (see
unit lighting instruction plate and the unit
nameplate).
8. Check the burner adjustment. See the “Primary Air
Shutter Adjustment” section of this manual.
9. Check all gas control valves and pipe connections
for leaks.
10. 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 main burners.
11. Inspect and service the motor/fan assemblies. To
maintain effi cient air fl ow, inspect and clean the fan
blades and guard to prevent buildup of foreign
matter.
12. Check lubrication instructions on the motor. If oiling
is required, add 3 to 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
every 1500 hours of operation.
Never over oil the motor or
premature failure may occur!
13. Check and test the operational functions of all
safety devices supplied with your unit.