Sterling QVEF User Manual download pdf (Page 17)

PILOT ADJUSTMENT

1. Remove the pilot adjustment cap.

2. Adjust the pilot screw to provide a properly sized

ﬂ ame.

3. A proper pilot flame is a soft steady flame that

envelops 3/8 to 1/2-inch (9.5 to 12.7 mm) of the

ﬂ ame sensor.

4. Replace the pilot adjustment cap.

MANIFOLD PRESSURE ADJUSTMENT

If the manifold pressure requires minor adjustment,

remove the cap from the pressure regulator and turn the

adjustment screw clockwise to increase the pressure,

or counterclockwise to decrease the pressure. The

adjusted manifold pressure should not vary more than

10% from the pressures speciﬁ ed in Table 5.

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 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 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 lighting instruction plate on the unit).

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 efficient air flow, 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 pre-

mature failure may occur!

13. Check and test the operational functions of all

safety devices supplied with your unit.

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Sterling QVEF User Manual Page 17

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