Armstrong Air BCE7E Series Manual de instrucciones de instalación - Página 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.

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.

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-

speed heat pumps

or AC units)

Tap

Low-speed

operation on high-

static system

Cooling speed

setting

Heat pump with

electric heat

High-static

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