Sterling QVOF - Manual (Page 4)

4
5 – FAN AND LIMIT CONTROL SETTING
A good rule to follow is to use lowest limit setting that
will assure enough heat and use lowest fan settings
that will not circulate cool air before fan stops.
The recommended setting is: Limit 200 degrees, fan on
130 degrees; fan off 90 degrees.
6 – STARTING AND TESTING OF UNIT
Before starting burner, it is advisable to remove nozzle
assembly and check nozzle size (see nozzle
specifications label on unit) and setting of electrodes.
Put 5 to 10 drops of good quality SAE 20 motor oil
(Havoline) in the oil cups at each end of the motor.
Repeat oiling of motor at the start and mid-point of
each heating season.
The burner is equipped with a cadmium sulfide flame
detector that is located in the base plate of ignition
transformer and is accessible by moving the transformer
to a position normally required for the removal of the
ignition assembly. If new installation, make sure fuel
tank has been filled. Insert a fuse in fuse block. Set
thermostat a minimum of 2 degrees above room
temperature.
It is important that the installation be checked for safety
shutdown in the event a malfunction of equipment
occurs. There are several ways this can be
accomplished. We recommend on of the following:
a. Before opening oil valve and priming fuel unit, turn
on switch. Burner should, but because of no fuel,
combustion will not be established. Burner should
operate the prescribed time, depending on the primary
control, and then go off on “safety”. If burner does
not start, check reset of primary, thermal cutout on
burner motor, or fuse.
b. After priming fuel unit (see following paragraph) and
establishing combustion, disconnect motor lead from
orange wire of primary and turn switch on. Primary
control should be energized and remain so the
prescribed time, depending on primary, and then go
on “safety”. After completion of test reconnect motor
lead to orange wire.
7 – TO PRIME FUEL UNIT
Place a can under valve of fuel unit and open bleed
valve one-quarter turn. Make certain all fuel oil valves
to burner are open. Push reset on primary control. Turn
on switch to burner. Operate burner until a good stream
of fuel, free from bubbles and foam, flows from bleed
valve. Close bleed valve and combustion should occur.
If primary goes “safety” before fuel unit is completely
purged, wait approximately four minutes, RESET
PRIMARY CONTROL AND CONTINUE PRIMING
UNTIL COMBUSTION IS ESTABLISHED.
8 – FINAL ADJUSTING AND TESTING
Punch or drill a hole in flue pipe as close to unit as
possible large enough to accommodate the probes of
the instruments (1/4″).
Using the draft gauge, adjust barometric draft regulator
to establish a maximum of minus .04 inches of draft in
flue pipe. It is desirable to operate with minimum draft
required to remove products of combustion; however,
unit should not operate with draft in flue pipe below
minus .02 inches. Failure to obtain these readings
indicate a need for a draft inducer.
Using the Smoke Tester, adjust “fine” air shutter of
burner (see burner specifications sheet) to effect a 0+
reading on smoke scale. If this is not possible, open
bulk air band to No. 1 setting on scale on burner housing
and reset “fined” adjustment. Continue the procedure
until recommended reading is obtained remembering
final adjustment should be made with fine tuning air
shutter.
Using the CO
2
Tester, analyze the flue gas. CO
2
should
be a minimum of 8 percent. Determine the gross stack
temperature using the Stack Thermometer. Net stack
temperature (flue gas temperature minus room
temperature) should be less than 600 degrees F.
If the recommended CO
2
or smoke readings cannot be
obtained, check the fuel nozzle pressure, and flue draft.
Recheck fuel nozzle for proper type (refer to nozzle
specification label on unit).
Installation is now complete. Fill out warranty card and
mail to register your warranty.