Supply Air Adjustments (Ecm Variable Speed Motors); 2.13 Installation Of Accessories; Figure 8: Blower Start/Stop Delays, Board #1158; Table 2: Air Adjustments, Heating Mode - Dettson AMP112SD Guide D'installation Et Manuel Du Propriétaire

Figure 8: Blower start/stop delays, board #1158

2.12 SUPPLY AIR ADJUSTMENTS
(ECM VARIABLE SPEED MOTORS)
On units equipped with ECM variable speed blower motors,
the air supply must be adjusted based on heating/air
conditioning output. The start/stop delays of the blower must
also be adjusted by positioning the DIP switches on the
electronic board. Refer to the following tables, air flow Table 2
and the wiring diagram in this manual for the proper settings:

Table 2: Air adjustments, heating mode

SW1 – HEAT
DIP Switch Positions
1 2
OFF OFF
ON OFF
OFF ON
ON ON
*
Alternate adjustment with higher temperature rise

Table 3: Airflow adjustments, air conditioning mode

SW2 – COOL
DIP Switch Positions
1 2
OFF OFF
ON OFF
OFF ON
ON ON

Table 4: Airflow adjustments, all modes

SW3 – ADJ (Adjustment)
DIP Switch Positions
1 2 POSITION
OFF OFF A
ON OFF B
OFF ON C
ON ON D
Input
USGPH
POSITION
A 0.68
B 0.80
C * 0.68
D * 0.80
Output
Tons
POSITION
A 3.5
B 3.0
C 2.5
D 2.0
CFM HTG. CFM A/C
% increase % increase
or decrease or decrease
0% 0%
+10% +10%
-10% -10%
N/A 0%

Table 5: Delay adjustments, heating mode

SW4 – Delay
DIP Switch Positions
1
OFF OFF
ON OFF
OFF
ON

2.13 INSTALLATION OF ACCESSORIES

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.
2.13.1 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.
2.13.2 Electronic Air Cleaner (EAC) (PSC Model)
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.
2.13.3 Air Conditioner (or Heat Pump)
An air conditioning coil may be installed on the supply air
side ONLY.
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 "dual-energy" thermostat, or
other control is required, in order to prevent the
simultaneous operation of the furnace and the heat pump.
9
2 POSITION
A
B
ON C
ON D
WARNING
WARNING
Input
USGPH
0.68
0.80
ALL
ALL