FIGURE 8
24 VAC Oil Furnace Wiring with Air Conditioner
11
FIGURE 9
24 VAC Oil Furnace Wiring with Heat Pump
1.5.9) 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 11 p. 23). The 120 VAC and neutral terminals
can be used for accessory wiring. See Electronic Air Cleaner
and Humidifier sections for further information.
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 (see Figures 8 and 9 on this page).
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 8 and 9 on this
page 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.
1.5.10) Air filter
An external filter rack is provided as standard equipment with
this furnace. The filter rack can be installed on the right or
left side panel, or on the bottom of the furnace to
accommodate the return air ductwork. A sufficient clearance
should be provided for air filter access. Refer to Table 2 for
filter rack flange dimensions for return air duct.
TABLE 2
Furnace
Model
Air Filter
Size
Flange
Opening
AMP, LBM & NOMV
(105 / 106)
16
"
x 24
"
15
"
x 23
"
AMP, LBM & NOMV
(120 / 156)
18
"
x 30
"
17
"
x 29
"
445 01 4036 02
