4-522.4
1
service instructions
The suntec fuel unit utilizes an internal strainer to trap foreign
material. Periodically, remove the fuel unit cover and clean
the strainer with a brush and clean fuel oil. Generally, service
problems do not occur with a fuel unit. A thorough check should
be made before replacing any fuel unit.
A. Install a vacuum gauge on an unused inlet port, when the
unit is turned on, the gauge should read approximately 1
inch of vacuum for each foot of vertical lift. Gravity fed fuel
units should read zero vacuum. If reading is higher than
expected, check for a closed tank or supply valve, kinked
tubing, plugged filter or strainer, frozen oil line, undersized
oil line or excessive oil lift, if gauge reads below expected
vacuum, look for air leaks in the oil hinges, valves, fittings or
fuel unit.
B. Install a pressure gauge on the gauge port of the fuel unit.
Pressure should read 130 +/- 2psi for POR100 and 145,
100 +/- 2psi for POR 185. If adjustment is necessary, refer
to Item 6 - Initial Start-Up. If needle on gauge bounces, see
service diagnosis for remedy.
C. To check the fuel unit cut-off pressure, install a pressure
gauge in the nozzle port. Operate the unit for approximately
one minute, then shut the unit off. The pressure should read
130 +/- 2psi for POR100 and 145, 100 +/- 2psi for POR
185 while the unit is running and should not drop to less
than 80 PSI and hold there after the burner is shut off. If the
pressure drops to zero, the fuel unit should be replaced.
fire Pot service
The ceramic-fiber fire pot will seldom, if ever, require
replacement unless it is accidentally damaged during a heat
exchanger cleaning operation. To replace, take off the front
access panel and remove all fire pot pieces. Carefully insert
new fire pot with the enclosed corbeled end to be opposite the
burner nozzle. (Open end of fire pot must be toward nozzle.)
figure 1.1
ceramic-fiber fire Pot
replacement Parts
All replacement parts and controls are proprietary in that they
have all been designed, tested, and approved for the particular
application to insure both physical and electrical fit and
performance. Any substitution of parts or controls not approved
by Modine will be at customer’s risk.
NOTE: Modine Manufacturing Company reserves the right
to substitute parts of advanced design and to change
specifications or prices without advance notice or without
incurring obligations.
Replacement parts can be obtained by submitting the model
number, power code, control code, and serial number shown
on the rating plate attached to the unit, along with a description
of the part, to the Service Department, Modine Manufacturing
Company, West Kingston, RI 02892.
CAUTION
To prevent unusual thermal stress and eventual harm to the
heat exchanger, do not operate unit heater without fire pot
or with a damaged fire pot that does not enclose the flame.
