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2.9
DUCTING
WARNING
Poisonous carbon monoxide gas hazard.
DO NOT draw return air from inside a closet or utility room. Return air
MUST be sealed to the furnace casing.
Failure to properly seal ducts can result in death, bodily injury and/or
property damage.
The ducting must be designed and installed according to approved
methods, local and national codes as well as good trade practices.
When ducting supplies air to a space other than where the furnace is
located, the return air must be sealed and also be directed to the
space other than where the furnace is located.
2.9.1
Air filter
A properly sized air filter must be installed on the return air side of the
unit. Refer to the Technical Specifications, table 7, for the correct
dimensions. Also refer to the instructions supplied with the filter.
2.9.2
Supply air adjustment (4 speed motor)
On units equipped with 4-speed blower motors, the supply air must be
adjusted based on heating/air conditioning output and the static
pressure of the duct system. For the desired air flow refer to the
following table as well as the air flow tables 9 based on static pressure
in the Technical Specifications section of this manual.
Table 1: Blower speed adjustments (heating mode, 4
speed motor)
HEATING
STATIC PRESSURE
CAPACITY
(USGPH)
0.55
0.55
0.70
0.70
Table 2: Blower speed adjustments (A/C mode, 4 speed
A/C CAPACITY (TONS)
2.0
2.5
3.0
To effect the adjustment, the RED (for heating) and BLUE (for cooling
and heat pump) wires can be changed on the motor. Also, refer to the
position of the wires on the electronic board of the unit and consult the
wiring diagrams. If the heating and air conditioning speeds are the
same, the RED wire must be moved to "UNUSED LEADS" on the
electronic board and the jumper provided with the BLUE wire must be
used between the "HEAT" and "COOL" terminals.
The blower start/stop delays can be adjusted by positioning the DIP
switches on the electronic board as shown in the following figures.
However, the recommended adjustments are 60 seconds blower ON
delay and 2 minutes blower OFF delay.
RECOMMENDED
(W.C.)
BLOWER SPEED
0.25"
MED-LOW
0.50"
MED-LOW
0.25"
MED-HIGH
0.50"
HIGH
motor)
RECOMMENDED
BLOWER SPEED
MED-LOW
MED-HIGH
HIGH
Figure 5: Blower start / stop delays - Board #1158
2.9.3
Supply air adjustment (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 and the wiring diagram, figure 8, in this
manual for the proper settings:
Table 3: Heating Mode
DIP Switch Positions
1
OFF
ON
OFF
ON
Table 4: Air Conditioning Mode
DIP Switch Positions
1
OFF
ON
OFF
ON
Table 5: CFM adjustment - All Modes
SW3 – ADJ (Adjustment)
DIP Switch Positions
1
2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
Table 6: Delay adjustments - Heating Mode
DIP Switch Positions
1
OFF
ON
OFF
ON
7
SW1 – HEAT
Input
USGPH
2
POSITION
OFF
A
0.70
OFF
B
0.55
ON
C*
0.55
ON
D
ALL
SW2 – COOL
Output
Tons
2
POSITION
OFF
A
3.0
OFF
B
2.5
ON
C
2.0
ON
D
1.5
CFM HTG.
CFM A/C
% increase
% increase
POSITION
or decrease
or decrease
A
0%
B
+10%
C
-10%
D
N/A
SW4 – DELAY
Input
USGPH
2
POSITION
OFF
A
0.70
OFF
B
0.55
ON
C*
0.55
ON
D
ALL
0%
+10%
-10%
0%
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