Refer to the applicable local and/or national installation
codes. Insulate the ducts that lead through non-heated
areas. Use flexible supply and return air connectors to
avoid the transmission of vibration. To make the unit run
even quieter, the installer should:
1. Use two elbows between each outlet and the sup-
ply and return air plenum;
2. Cover the vertical sections of the supply and return
air duct with soundproofing material;
3. Use baffles in short radius elbows;
4. Use flexible hangers to suspend the ducts.
A heat pump or an air conditioner can be added to this
furnace, in either the supply or return air duct. Carefully
follow the instructions provided with these appliances to
ensure proper installation and hook-up to the electric fur-
nace. Refrigerant and drainage pipes must in no way
hinder access to the furnace panels.
2.6
SUPPLY AIR ADJUSTMENTS
Fan Control Board taps are used by the installer to con-
figure a system. The ECM motor uses the selected taps
to modify its operation to a pre-programmed table of air-
flows (Refer to Table 3 and Table 4). Airflows are based
on system size or mode of operation and those airflows
are modified in response to thermostat inputs such as
dehumidification request.
SUP electric furnace must be configured to operate prop-
erly with system components with which it is installed. To
successfully configure a system (see information printed
on circuit board label located next to select pins), move
the 6 select wires to the pins which match the compo-
nents used. (Refer to Figure 10)
Figure 10: Fan control board
2.6.1
HEAT KW/CFM adjustment
Installer must verify (factory set) the electric heat airflow
adjustment required for kW size heater installed.
The select pins are marked 25, 23/20, 18/15, 10 (for ½
HP ECM motor unit) and 30/27, 25, 23, 20, (for 1.0 HP
ECM motor unit). Refer to the unit wiring diagram and
select the pin for the kW size heater being used (Refer to
Figure 10 and Figure 16).
The airflow must be large enough for safe and continu-
ous operation. (Refer to Table 3 and 4 for airflow delivery
CFM).
2.6.2
AC/HP size
Select System Size Installed
The factory setting for air conditioner or heat pump size
is the largest outdoor unit that can be used with the fur-
nace. Installer needs to select air conditioner or heat
pump size to ensure that airflow delivered falls within
proper range for the size unit installed.
The select pins are marked 3, 2 ½, 2, 1 ½ for furnace
equipped with ½ HP ECM motor and 5, 4, 3 ½, 3 for
furnace equipped with 1.0 HP ECM motor. Refer to the
unit wiring diagram and select the pin for the outdoor unit
size being used (Refer to Figure 10 and Figure 16).
2.6.3
System type
Select System Type Installed AC or HP
The type of system must be selected:
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