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

10

OPeRATINg INsTRucTIONs (hTlV-D)

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 ener-

gized.  The United Technologies 1168-1 has an adjustable fan on/

off time delay that is programmed into the ECM motor, and is set by 

selecting the SW4 DIP switch combination displayed in 

Tables 8 A 

and B 

pages 16 and 17

.

  Fan on/off delay must be adjusted according 

to input (nozzle size).

Set the thermostat below room temperature. The oil burner 

1. 

should stop.
The air circulation blower will continue to run until the blower 

2. 

off delay setting programmed into the ECM motor times out.
To check the operation of the limit switch, shut off power to the 

3. 

furnace. Temporarily remove the 5 pin power connector plug 

from the ECM blower motor.  

NOTICE

Isolate the AC Line pins on the 5 pin power connec-

tor with electrical tape to prevent electric shock hazard.   

Restore the electrical power to the furnace and set the 

thermostat above room temperature.

After three or four minutes of burner operation, the limit 

4. 

control should turn the burner off. When the limit function 

test is complete, shut off electrical power to the furnace, replace 

the 5 pin power plug 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.

NOTICE

IF THE FURNACE IS TO BE SHUT DOWN FOR AN 

EXTENDED PERIOD OF TIME, CLOSE THE OIL SUP-

PLY VALVE TO THE BURNER.

!

CAUTION

DO NOT ATTEMPT TO START THE BURNER WHEN 

EXCESS OIL HAS ACCUMULATED, WHEN THE 

FURNACE IS FULL OF VAPOR, OR WHEN THE COM-

BUSTION CHAMBER IS VERY HOT. NEVER BURN 

GARBAGE OR PAPER IN THE FURNACE, AND NEVER 

LEAVE PAPER OR RAGS AROUND THE UNIT.

ecM blOWeR MOTOR OPeRATION (hTlV-D)

setting blower “ON” and “Off” Timings

Blower on/off time delays are handled by ECM motor programming.  

Features of this ECM variable speed motor are that it will deliver a 

constant airflow within a wide range of external static pressures, and 

also includes:

Soft Start

:  This ECM variable speed motor will slowly ramp up to 

the required operating speed.  This feature in the heating cycle allows 

the heat exchanger to reach operating temperature before the blower 

motor starts, which minimizes noise and increases comfort.

Soft Stop

:  At the end of the heating cycle, the ECM variable speed 

motor will slowly ramp down.  This feature allows for increased 

energy efficiency and reduced noise levels.

Dehumidification

: A dehumidification feature has been pro-

grammed into the variable speed motor.  At the start of each cooling 

cycle, the variable speed motor will run at 82% of the rated airflow 

for 7.5 minutes.  After 7.5 minutes has elapsed, the motor will 

increase to 100% of the rated airflow.  This profile is used to provide 

dehumidification and improve system efficiency.

Continuous Fan Operation:

 When the thermostat continuous 

fan (G) switch is on without a call for heating or cooling, the indoor 

fan is immediately energized up to 50% of the cooling speed.  This 

feature allows continuous circulation of air between calls for heating 

or cooling.
If a call for heat (W) or cool (Y) occurs during continuous fan, the 

blower will remain energized.