Wiring; Accessory Installation; Air Filter; Figure 9 : 24 Vac Oil Furnace Wiring With Air Conditioner - CAC / BDP CVMAAR036105 Installation Instructions Manual

A separate line voltage supply should be used with fused
disconnect switch or circuit breaker between the main power
panel and the unit.
Use only copper wire for 115V supply service to the unit.
Metallic conduit (where required/used) may terminate at the
side panel of the unit. It is not necessary to extend the
conduit inside the unit from the side panel to the control box.
When replacing any original furnace wiring, use only 105
16 AWG copper wire.
2.4.3 24V Wiring
Instructions for wiring thermostat (field supplied) are packed
in the thermostat box. Make thermostat connections as
shown in Figures 9 and 10. Thermostat wire connections at
R and W are the minimum required for oil heating operation.
2.4.4

Accessory installation

General
When installing optional accessories on this appliance,
follow manufacturer's Installation Instructions included with
accessory.
Auxiliary terminals
The HUM 120 VAC terminals on the electronic control board
are tied directly to the #8 pin of the 9-pin connector and
provide a 120 VAC signal whenever the burner is energized,
see Figure 13. The 120 VAC and neutral terminals can be
used for accessory wiring. See Electronic Air Cleaner and
Humidifier sections for further information.
Figure 9 : 24 VAC Oil Furnace Wiring with Air
Conditioner
Electronic Air Cleaner
When adding an electronic air cleaner to this unit, use an
Airflow Sensor kit. As the air cleaner is connected to
constant 120 VAC power, the airflow sensor turns on the
electronic air cleaner when the furnace blower is operating.
Humidifier / Humidistat
A 24 VAC signal can be connected, sourced from the W and
C terminals on the electronic control board or a 120 VAC
signal from the HUM 120 VAC or N terminals, when a heat
source must be used.

Figure 10 : 24 VAC Oil Furnace Wiring with Heat Pump

o
C,
Dehumidification capability with standard Humidistat
Dehumidification on systems using a variable speed motor
is better than on most other systems. If this feature is
required, the terminals on the electronic control board permit
the wiring of a standard humidistat. Refer to Figures 9 and
10 for wiring instructions.
A furnace equipped with a variable speed motor will detect
the opening of the humidistat contact and reduce the airflow
to 85% of nominal cooling airflow. This will increase its
capacity to dehumidify up to the point where the humidistat
detects an acceptable level of humidity in the air. At that
point the unit return to 100% of its cooling airflow.
To activate this mode, remove the jumper between DH
and R of the electronic board and wire in a standard
humidistat on these terminals.
2.4.8
Do not use this furnace as a construction heater. Use of
this furnace as a construction heater exposes it to
abnormal conditions, contaminated combustion air and
DNS-1024 Rev D
the lack of air filters. Failure to follow this warning can
lead to premature furnace failure and/or vent failure that
could result in a fire hazard and/or bodily harm.
An external filter rack is provided as standard equipment
with this furnace. The filter rack can be installed on the right
10

Air filter

DANGER
DNS-1025 Rev D