Installing Accessories; Electronic Air Cleaner; Humidifier; Air Conditioning - Dettson OLR105A12D Mode D'emploi

2.8

INSTALLING ACCESSORIES

WARNING
ELECTRICAL SHOCK HAZARD.
Turn OFF electric power at fuse box or service panel
before making any electrical connections and ensure a
proper ground connection is made before connecting
line voltage.
Failure to do so could result in death, bodily injury
and/or property damage.
2.8.1

Electronic air cleaner

Wire terminals are provided to direct 115 volts @ 0.5 Amp
maximum to an Electronic Air Cleaner (EAC). Power will be
available to the EAC at all times, so it must incorporate a
flow proving switch if it is to be wired into the furnace control
box. Most modern EACs have the required integral airflow
proving switch. Wire the electronic air cleaner between
terminals #5 and #2. Refer to wiring diagram, Figure 11.
2.8.2

Humidifier

The red wire from burner can be used to direct 115 volts @
1.0 Amp maximum to the transformer powering the
humidifier. The humidifier will be energised anytime the
burner is operating in the "Heating Mode". Refer to wiring
diagram, Figure 11.
2.8.3

Air conditioning

An air conditioning coil may be installed on the supply air
side only. Also, notwithstanding the evaporator coil
manufacturer's instructions, a minimum of 15 cm (6")
clearance must be allowed between the bottom of the coil
drain pan and the top of the heat exchanger. Wire the
thermostat and condensing unit contactor as indicated in
Figure 11.
2.8.4

Ductwork and Filter

Design and install the air distribution system to comply with
Air Conditioning Contractors of America manuals or other
approved methods that conform to local and/or national
codes and good trade practices.
When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct
outside furnace space.
If a separate evaporator and blower unit is used, install
appropriate sealing dampers for air flow control. Cold air
from the evaporator coil going through the furnace could
cause condensation and shorten furnace life.
CAUTION
Dampers (purchased locally) MUST be automatic.
WARNING
POISONOUS CARBON MONOXIDE GAS HAZARD.
Do NOT draw return air from inside a closet or utility
room. Return air duct MUST be sealed to furnace
casing.
Failure to properly seal duct can result in death,
personal injury and/or property damage.
POISONOUS CARBON MONOXIDE GAS HAZARD.
Install evaporator coil on the supply side of the furnace
ducting.
Evaporator coil installed in return side ducting can
cause condensation to form inside heat exchanger
resulting in heat exchanger failure. This could result in
death, personal injury and/or property damage.
Return air grilles and warm air registers must not be
obstructed.
3.0

OPERATION

3.1

MANUAL OPERATION SWITCHES

Figure 2 :
3.2

SEQUENCE OF OPERATION

3.2.1 Sequence of operation - Beckett AFII
Side-wall venting
1. On the Beckett AFII burner, the T-T terminals have to
be jumpered on the primary control of the burner;
2. Normally open contact (W-R) on SPDT relay closes
when thermostat calls for heat;
3. Burner motor starts and spark is established. The
burner motor fan pre-purges the combustion chamber
and vent for 15 to 20 seconds, establishing the
combustion air pattern;
4. After the pre-purge period, solenoid valve opens
allowing oil to flow through nozzle;
5. The ignition transformer spark ignites oil spray;
6. Cad cell senses flame and burner continues to fire;
7. After Fan-Limit Control heats up to the factory set point,
the circulating air blower starts;
8. The circulating air blower, burner motor and ignition
transformer remain on until the thermostat is satisfied.
Also, the solenoid valve remains open;
9
WARNING
CAUTION
Manual operation switches
DNS-0574 Rev. C