Operating instructions

MAINTENANCE
980076 08/26/03
4-7
COIL SOOT DEPOSITS
If, for some reason, the oil burner does not function
properly, soot is probably deposited on the heating
coil. If this happens, clean as follows:
1. Remove the stack end plate from the front of
your unit.
2. Remove the baffle retainer plate and the coil
baffle.
Take care in removing the
baffle. Do NOT break it as it
provides a seal for proper combustion. If the
baffle is damaged, replace it.
1. Remove the burner belt and the fuel line to the
tank.
2. Remove the burner box assembly from the coil
casing.
3. Cover the front panel with plastic and pressure
wash the coil with the unit tilted (front panel side
down). Clean the soot off the coil.
4. When clean, re-assemble the unit.
VACUUM RELIEF VALVE
While the unit is running at full RPM, block the
airflow at the vacuum inlet connection and read the
vacuum gauge. If adjustment is required, shut the
unit down and adjust the vacuum relief valve locking
nut tension. Start your unit and read the vacuum
gauge. Repeat this process until the relief valve
opens at 14" Hg.
VACUUM PUMP DRIVE BELTS
To tighten the vacuum pump belts:
1. Loosen the four nuts which hold the vacuum
pump mount in place.
2. Turn the adjusting bolts until the proper belt
tension is achieved (1/2” deflection in the center
of the belt, halfway between the pulleys).
NOTE: When adjusting belt tension, make certain
that the engine shaft and vacuum pump shaft
remain parallel, and the belt tension is equal
throughout the belt width.
3. After adjusting, re-tighten the four nuts, which
hold the vacuum pump mount in position. Check
belt alignment with straight- edge.
WATER PUMP DRIVE BELT
To tighten the water pump belt:
1. Loosen the nuts, which hold the water pump
mount to base.
2. Adjust the position of the belt tension adjusting
bolt until the proper belt tension is achieved.
(1/2" deflection in the center of the belt, halfway
between the pulleys).
3. While checking the alignment, tighten the nuts,
which hold the water pump mount to base.
FLOAT VALVE (WATER BOX)
The float valve should only be adjusted if the
water box is overflowing or the water level in the box
is lower than 5-1/2":
1. If the box is overflowing, remove and check the
float valve for debris or damage.
NOTE: If the float ball has any water inside it
must be replaced.
When replacing float ball, DO
NOT over- tighten, as the rod
can puncture the ball. Make sure to tighten the
nuts on the rod.
2. Disassemble the valve and check the piston and
seat for damage, replace if needed. See the
“Illustrated Parts Listing” for a parts breakdown.