Armstrong Air BCE7E-042 Руководство по установке - Страница 10
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With only the blower motor running and the evaporator
coil dry, observe the manometer reading. Adjust blower
motor speed to deliver the air desired according to the
job requirements.
4.
For best air performance external static pressure drop
must not exceed 0.5" W.C. (1.2 kPa). Refer to blower
data tables for CFM and external static.
5.
Seal around the hole when the check is complete.
Adjusting Blower Speed
Motor Speed Taps
NOTE: Motor is programmed for a 45-second delayed OFF
on all speed taps except TAP #1 (continuous fan speed).
Table 4 lists the recommended factory blower speed tap
selections for BCE7E series units.
Operation
BCE7E
Cooling
All Sizes
Heating*
* Minimum setting for heat
Table 4. Recommended Blower Speed Tap Selection
These settings are for nominal tonnage match-ups with
the BCE7E units. When matched with other sizes, it is
recommended that the CFM be adjusted to approximately
400 CFM per ton.
Page 10 of 19
Outdoor Unit
Air conditioner
Heat pump
Air conditioner with electric
heat only
Heat pump with electric
heat
To change blower motor speed tap remove the speed
tap from Y2 on the terminal strip and insert the desired
speed tap. Use the Blower Data tables for the desired CFM
setting.
The high-efficiency programmable motor features
programmed electronic braking. The integral control
brakes the motor near the end of the supply blower
operation, allowing the motor to maintain a more
controlled ramping shut-down.
Tap
Continuous or low-
speed fan (for two-
1
speed heat pumps
or AC units)
Tap
3
3
Low-speed
2
operation on high-
4
static system
4
Cooling speed
3
setting
Heat pump with
4
electric heat
High-static
5
applications
Issue 1813
IMPORTANT
Operation
Continuous fan speed is
energized (24V input to G)
when either G or Y1 has a
24V signal (24V input from
Y1 passes through the room
thermostat's Fan Automatic
contacts to the G terminal).
CFM set at 1/2 ton less than
nominal of unit (e.g. 3-ton set at
1000 CFM).
CFM set at 400 cfm per nominal
ton at ARI minimum static
allowed, as follows:
1.5 to 2.0 ton - 0.10
2.5 to 3.5 ton - 0.15
4 to 5 ton - 0.20
CFM set at 400 cfm per nominal
ton at .4 static. Energized when
electric heat element has a call
for heat.
CFM set at 400 cfm per nominal
ton at .8 static.
Table 5. Motor Speed Taps
Remarks
507838-01