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Air Flow — Cooling Blower Speed
The cooling blower speed is factory configured to provide
correct air flow for an outdoor unit that matches the cooling
capacity rating of the air handler.
If the outdoor unit is smaller than the maximum cooling
capacity rating for the air handler, the cooling blower speed
may need to be changed. Refer to blower performance
chart (table 4).
WARNING
ELECTRIC SHOCK HAZARD!
Disconnect all power supplies before
servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
Adjusting Blower Speed
MOTOR SPEED TAPS
NOTE - Motor is programmed for a 45-second delay off
on all speed taps except TAP #1 (continuous fan speed).
Table 2 lists the recommended factory blower speed tap
selections for BCE series units.
Operation
Capacity
Cooling
ALL
SIZES
Heating*
*Minimum setting for heat
Table 2. Recommended Factory Blower Speed Tap
Selections
507623-02
Outdoor Unit
Condensing unit
Heat pump
Condensing unit with
electric heat only
Heat Pump with electric
heat
These settings are for nominal tonnage match-ups with
the BCE
units. When matched with other sizes, it is
recommended that the CFM be adjusted to approximately
400 CFM per ton.
To change the blower motor speed to tap 2 for 1/2 ton size
smaller, remove and swap the brown wire from the W2 tap
board location with the yellow wire on the Y tap. To change
the blower motor speed to tap 5, remove and swap the
black wire from the DS tap board location with the yellow
wire on the Y tap.
Motor Speed Taps
Tap
Operation
1
Continuous fan
2
Lower tonnage
cooling speed
3
Cooling speed
setting
4
Heat pump with
electric heat
Tap
3
3
5
High static
applications
4
4
Issue 1810
Remarks
Continuous fan speed is
energized (24 volt input to G)
when either G or Y1 has a 24
volt signal (24 volt input from
Y1 passes through the room
thermostat's Fan Automatic
contacts to the G terminal).
SCFM set at 1/2 ton less than
nominal of unit (e.g. 3-ton set at
1000 SCFM).
SCFM set at 400 SCFM per
nominal ton at AHRI minimum
static allowed, as follows:
1.5 to 2.0 ton -0.18
2.5 to 3.5 ton -0.23
4 to 5 ton -0.28
SCFM set at 400 SCFM per
nominal ton at .5 static. Energized
when electric heat element has a
call for heat.
SCFM set at 400 cfm per nominal
ton at .8 static.
Table 3
Page 17 of 22
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