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20. OPERATING INSTRUCTIONS
Before Lighting
Open all supply and return air registers and grilles.
Open all valves in oil pipes.
Turn on electric power supply.
To Light Unit
Set the thermostat above room temperature to call for
heat. The burner should start. NOTE: It may be
necessary to press the RESET button on the primary
combustion control relay.
There will be a fan on time delay before the circulating
fan is energized. The United Technologies 1158-120
has an adjustable fan on time that is set by selecting
the dipswitch combination displayed in Chart 1. This
fan on delay can be set at 30, 60, 90 or 120.
Set the thermostat below room temperature. The oil
burner should stop.
The air circulation blower will continue to run until the
time off setting selected on the electronic fan timer
control times out. The United Technologies 1158-120
have an adjustable fan off time of 2, 3, 4, & 6 minutes.
The fan timer control adjustments may be altered if the
air at the room registers is uncomfortably high upon
blower start up or shutdown.
The necessary adjustments to the fan control settings
should be determined by measuring the temperature of
the air in the supply air take-off, or within the first few
inches of the supply air trunk. The side mid point of the
transition
is
usually
thermometer probe is beyond the "line of sight"
wherein false readings from radiant heat could be
observed. The system temperature rise is the
difference in temperature between the supply air and
return air.
To check the operation of the limit switch, shut off
power to the furnace. Temporarily remove the neutral
wire from the direct drive blower motor. Restore the
electrical power to the furnace and set the thermostat
above room temperature.
After three or four minutes of burner operation, the limit
control should turn the burner off. When the limit
function test is complete, shut off electrical power to
the furnace, replace the neutral wire to the blower fan
motor, and then restore power. The blower fan will
start up immediately. Once the temperature has
dropped and the limit control has reset, the fan will
operate until the fan off time is achieved. The oil burner
will then resume operation and continue until the
thermostat is satisfied. Restore the thermostat setting
to a comfortable temperature.
ideal,
providing
that
To Shut Down Unit
Set the thermostat to the lowest possible setting.
Set the manual switch (if installed) in the Electrical
Power Supply Line to "OFF".
NOTE: IF THE FURNACE IS TO BE SHUT DOWN
FOR AN EXTENDED PERIOD OF TIME, CLOSE THE
OIL SUPPLY VALVE TO THE BURNER.
DO NOT ATTEMPT TO START THE BURNER
WHEN
EXCESS
WHEN THE FURNACE IS FULL OF VAPOUR, OR
WHEN THE COMBUSTION CHAMBER IS VERY
HOT. NEVER BURN GARBAGE OR PAPER IN
THE FURNACE, AND NEVER LEAVE PAPER OR
RAGS AROUND THE UNIT.
the
9
OIL
HAS
ACCUMULATED,
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