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2.10
INSTALLATION OF
ACCESSORIES
WARNING
Electrical shock hazard.
Turn OFF electrical power at the 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 can result in death or bodily injury.
2.10.1
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.
2.10.2
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 can be used to provide
a constant supply of 120 VAC.
Also refer to the instructions supplied with the accessory.
2.10.3
Air Conditioner (or Heat Pump)
An air conditioning coil has to be installed on the supply air side
ONLY.
WARNING
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 single thermostat able to control both, the furnace
and
heat
pump
is
recommended
simultaneous operation. 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.
If a coil blower compartment is used, install air tight, motorized
and automatic air dampers. Cold air coming from the coil and
passing across the furnace can cause condensation and shorten
the life of the heat exchanger.
8
in
order to prevent
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