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2.7
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.
2.7.1.
Humidifier and humidistat connection
Fan Control Board terminals HUM1 (directly connected
internally to C on terminal block) and HUM2 (directly
connected internally to G on terminal block) are provided for
direct connections to the low-voltage control of a humidifier
through a standard humidistat (refer to Figure 10).
Figure 10 : Standard humidistat connections
These terminals are energized with 24 VAC when G
thermostat signal is present. Alternately, the 24 VAC signal
may be sourced from the W1 and C terminal block
connections when electric heaters are used as a primary
heating source (refer to Figure 11).
Figure 11 : Thermostat connections
2.7.2.
Electronic Air Cleaner (EAC) connections
Fan Control Board terminals AUX1 (directly connected
internally to C on terminal block) and AUX2 (directly
connected internally to G on terminal block) are provided for
direct connections to the low-voltage control of an electronic
air cleaner. These terminals are energized with 24 VAC
when G thermostat signal is present (refer to Figure 12).
Figure 12 : Electronic air cleaner connections
2.7.3.
Dehumidify capability with standard humidistat
connection
Latent capacities for systems using this unit are better than
average systems.
If increased latent capacity is an
application requirement, the field wiring terminal block
provides a connection terminal (DH) for use of a standard
humidistat. The furnace control will detect the humidistat
contact opening on increasing humidity and reduce its
airflow to approximately 80% of nominal cooling mode
airflow.
capacity until the humidity falls to a level which causes the
humidistat contact to close its contacts.
2.7.4.
When using a heat pump, a thermostat with dial fuel option
or a fossil fuel kit is required that prevents the operation of
the electric elements and the heat pump at the same time.
Refer to the instructions provided with the thermostat or the
"Fossil Fuel" kit for the proper wiring of the furnace and the
heat pump.
The simultaneous operation of the electric elements and the
heat pump will cause overheating of either unit. The safety
controls of the appliances will shut down the elements or
heat pump, since they are not designed to function in this
fashion.
3.0
3.1
Before starting up the unit, be sure to check that the
following items are in compliance:
DNS-1154 Rev. A
1.
The electrical installation and ventilation;
2.
The blower access door is in place and the blower rail
locking screws are well tightened;
3.
The blower speed adjustments for heating and air
conditioning are appropriate and according to the
specifications in this manual;
4.
The thermostat of the room is in the heating mode and
is set higher than the ambient temperature.
5.
The breakers on front panel are closed (green indicator)
To start the unit, turn the main electrical switch on.
DNS-1154 Rev. A
3.2
When there is a demand for heat, the pilot light ("L-1")
comes on. Refer to the wiring diagram.
When the "HI/LO" switch is put into the "LO" position, it will
shut down approximately half the elements.
However, it is important to put the switch back to the
"HI" position during the winter months to ensure
adequate heating.
Also, this switch must remain in the "HI" position when a 2-
stage or outdoor thermostat is used to control the electric
elements of the second stage.
Section 2.5) above (Typical 24 VAC Wiring, Thermostat).
DNS-1154 Rev. A
The "ON/OFF VENT/FAN" switch engages the blower in the
continuous speed mode. This will filter the air and provide
for better air distribution in the building.
The circuit breaker is there to protect the motor and control
circuit conductors. If the unit does not function, press the
circuit breaker button to see if it may have disengaged due
to a power surge. If the breaker has to be pressed again,
the unit must be checked by a qualified service technician.
8
This reduction will increase the system latent
Use of a heat pump
OPERATION
START-UP
USE OF MANUAL FURNACE CONTROLS
Refer to the diagram in
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