Olsen HTL-90D, Installation, Operation & Maintenance Manual

19

OIl buRNeR OPeRATION

Once the furnace flue pipe, electrical and oil line connections have 

been made, use the following instructions to set the burner:
Shut off the electrical power to the furnace.
Install an oil pressure gauge to the pressure port on the oil pump. 

(Refer to the oil pump specification sheet included with the burner 

instructions).
Restore electrical power to the furnace.
Start the furnace and bleed all air from the fuel oil lines.
Close the purge valve and fire the unit.
Allow the furnace to warm up to normal operating temperatures. 

During this time, set the pump pressure in accordance with the data 

provided in

 Tables 3A, B & C , 

page 11

.

When the furnace has reached "steady state" (after approximately 10 

minutes). Set combustion air damper to get a TRACE of smoke.
Check the system temperature rise. The temperature rise is the 

difference between the return air temperature measured at a point 

near the return air inlet, and the supply air temperature measured 

near the furnace outlet. The system temperature rise is listed on the 

furnace rating plate. If the temperature rise is too high, the airflow 

must be increased. If the temperature rise is too low, the fan should 

be slowed down.
Turn off the burner. Observing the duct thermometer in the supply 

air stream, note the temperature at which the blower fan stops. The 

fan adjustments can be made by moving the dipswitch settings on 

the timer control board for fan off delay. 
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.
Set the heat anticipator adjustment in the thermostat (if so 

equipped), by removing the "R" or "W" wire to the thermostat, then 

reading the amperage draw between the two wires. Failure to remove 

one of the wires from the thermostat while performing this test 

could burn out the heat anticipator. Set the heat anticipator to the 

amperage measured.

NOTICE

THE FURNACE SHOULD BE RUN THROUGH AT 

LEAST THREE FULL CYCLES BEFORE LEAVING THE 

INSTALLATION, TO ENSURE THAT ALL CONTROLS 

ARE OPERATING PROPERLY AND AS EXPECTED.

NOTICE

ALL JOINTS IN ANY POSITIVE PRESSURE VENTING 

SYSTEM MUST BE CHECKED FOR LEAKS BEFORE 

LEAVING THE INSTALLATION SITE.