PLB-112
Oil Furnaces
–
Furnace Manual
11/13
11
1.12.1.
Humidifier (HUM)
The 120 VAC HUM terminal on the electronic board of the blower is
tied directly to terminal 8 of the 9-terminal connector of the electronic
board. It supplies 120 VAC electric power when the burner is in
operation.
A 24 VAC signal can also be supplied from the W and C terminals
on the blower electronic board to activate a switching relay.
Also refer to the instructions supplied with the accessory.
1.12.2.
Electronic Air Cleaner (EAC)
The EAC terminal on the electronic board supplies 120 VAC when
the blower is operating in the heating or air conditioning mode. This
signal can be used to activate an electronic air cleaner that is not
equipped with an air flow switch. If the cleaner is equipped with an
air flow switch, the S terminal on the electronic board or one of the
120 VAC terminal on the ECM electronic card can be used to
provide a constant supply of 120 VAC.
Also refer to the instructions supplied with the accessory.
1.12.3.
Air Conditioner (or Heat Pump)
An air conditioning coil may be installed on the supply air side
ONLY.
Poisonous carbon monoxide gas hazard.
Install the evaporator coil on the supply side of the
furnace ducting ONLY.
An evaporator coil installed on the return air side
of the ducting can cause condensation to form
inside the heat exchanger, resulting in heat
exchanger failure. This in turn, can result in death,
bodily injury and/or property damage.
A clearance of 15 cm (6") is required between the bottom of the coil
drain pan and the top of the heat exchanger. If a heat pump is
installed, a “dual-energy” thermostat, or other control is
recommended, in order to prevent the simultaneous operation of the
furnace and the heat pump. It also prevents a direct transition from
heating by way of the heat pump to heating with oil. Refer to the
thermostat instructions or those of another control used for the
proper wiring.
2.
OPERATION
2.1.
START-UP
Before starting up the unit, be sure to check that the following items
are in compliance:
1. The electrical installation, the oil supply system, the venting
system, combustion air supply and ventilation;
2. The blower access door is in place and the blower rail locking
screws are well tightened;
3. The Blocked Vent Shut-Off (BVSO) is installed according to
instructions (for chimney venting);
4.
The oil supply valve is open;
5.
The burner ‘’Reset’’ button is well pushed in or re-armed;
6. The preliminary air adjustments on the burner comply with the
technical specifications in this manual;
7. The blower speed adjustments for heating and air conditioning
are appropriate and according to the specifications in this
manual;
8.
The blower start/stop delays are satisfactory;
9. The thermostat of the room is in the heating mode and is set
higher than the ambient temperature.
To start the unit, turn the main electrical switch on.
2.2.
OPERATING SEQUENCE
OIL HEATING MODE
1.
The W-R contact closes;
2. The burner motor starts up to pre-purge the combustion
chamber for a period of 10 to 15 seconds. During that time a
spark is established on the electrodes;
3. The solenoid valve opens and a flame is established. Shortly
after, the electrodes cease to spark;
4. Then the blower runs up to full speed. The delay depends on
the adjustments that were made on the electronic board, which
controls the blower motor. Refer to Sections 1.10. to 1.11., as
well as the CFM tables 12 and 13 for more details.
5. When the call for heat is satisfied, the solenoid valve closes,
the flame goes out and the burner motor stops (after post purge
delay, if applicable).
6. The blower stops shortly after the burner. The delay depends
on the adjustments that were made on the electronic board that
controls the blower. Refer to Sections 1.10. to 1.11., as well as
the CFM tables 12 and 13 for more details.
Note: A detailed operating sequence of the oil burner is outlined in the
instructions provided with the burner.
2.3.
CHECKS AND ADJUSTMENTS
2.3.1.
Purging the oil line
Open the bleed port screw and start the burner. Allow the oil to drain
into a container for at least 10 seconds. The oil should flow
absolutely free of white streaks or air bubbles to indicate that no air
is being drawn into the suction side of the oil piping and pump.
Slowly close and tighten the bleed screw. Once closed, the flame
will light up.
2.3.2.
Pressure adjustment
The oil pressure must be adjusted according to the Specifications in
Table 11 of this manual. An adjustment screw and a connection for a
pressure gauge are located on the oil pump for that purpose. Also
refer to the burner instruction manual.
