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507838-01

Issue 1813

Page 10 of 19

3.  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

Outdoor Unit

Tap

Cooling

All Sizes

Air conditioner

3

Heat pump

3

Heating*

Air conditioner with electric 

heat only

4

Heat pump with electric 

heat

4

* 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.

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.

 IMPORTANT

Tap

Operation

Remarks

1

Continuous or low-

speed fan (for two-

speed heat pumps 

or AC units)

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).

2

Low-speed 

operation on high-

static system

CFM set at 1/2 ton less than 

nominal of unit (e.g. 3-ton set at 

1000 CFM).

3

Cooling speed 

setting

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

4

Heat pump with 

electric heat

CFM set at 400 cfm per nominal 

ton at .4 static. Energized when 

electric heat element has a call 

for heat.

5

High-static 

applications

CFM set at 400 cfm per nominal 

ton at .8 static.

Table 5. Motor Speed Taps

Содержание BCE7E Series

Страница 1: ...Static Pressure 9 Adjusting Blower Speed 10 Blower Data 11 Making Electrical Connections 13 Homeowner Maintenance 16 Professional Maintenance 16 Repairing or Replacing Cabinet Insulation 16 Check out...

Страница 2: ...SUCTION LINE SUPPLY AIR OPENING RETURN AIR FILTER LOW VOLTAGE INLETS TOP AND RIGHT SIDE RETURN AIR TOP VIEW FRONT VIEW SIDE VIEW BLOWER PIPING PLATE DETAIL FOR UP FLOW AND DOWN FLOW POSITIONS A C B 11...

Страница 3: ...S TOP AND RIGHT SIDE 5 3 8 137 4 3 8 111 LIQUID LINE SUCTION LINE Supply Air Opening FILTER LOW VOLTAGE INLETS TOP AND LEFT SIDE END VIEW BLOWER B C D Coil 3 4 19 3 4 19 3 4 19 Return Air Opening F E...

Страница 4: ...his unit must be matched with an indoor coil as specified in the product specification sheets Coils previously charged with HCFC 22 must be flushed IMPORTANT In addition to conforming to manufacturer...

Страница 5: ...remove access panels and the horizontal drip shield 060 model and the corrugated padding between the blower and coil assembly Discard the corrugated padding 2 Install the horizontal shield on the fro...

Страница 6: ...that may plug up the drain opening IMPORTANT 4 Rotate drain pan 180 front to back and install it on the opposite side of the coil 5 Remove screws from top cap Remove horizontal drip shield screw locat...

Страница 7: ...ctions To prevent the build up of high levels of nitrogen when purging it must be done in a well ventilated area Purge low pressure nitrogen 1 to 2 psig through the refrigerant piping during brazing T...

Страница 8: ...SPACE OVERFLOW DRAIN LINE ALWAYS RUN AN OVERFLOW DRAIN LINE IF NOT POSSIBLE TO ROUTE OVERFLOW DRAIN LINE INSTALL LOW VOLTAGE OVERFLOW SWITCH KIT WIRE KIT TO SHUT DOWN COMPRESSOR PER INSTRUCTIONS NO YE...

Страница 9: ...y side of the system On ducted systems connect the other end of manometer to the return duct as above For systems with non ducted returns leave the other end of the manometer open to the atmosphere LE...

Страница 10: ...ed to approximately 400 CFM per ton 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...

Страница 11: ...cfm watts cfm watts 10 767 78 753 75 826 88 957 131 1095 189 20 662 68 648 66 791 100 937 142 1063 199 30 615 76 612 77 750 108 895 149 1040 211 40 561 83 539 83 711 116 861 160 1010 226 50 522 87 50...

Страница 12: ...328 336 1573 473 70 838 204 1022 267 1294 358 1303 351 1541 485 80 815 218 1003 375 1238 375 1228 373 1494 515 BCE7E 048 Blower Performance External Static Pressure in w g Air Volume and Motor Watts T...

Страница 13: ...terminal strip in the control section The speed can be increased by swapping wires as shown in Figure 11 Wiring Connections 1 Install line voltage power supply to unit from a properly installed circui...

Страница 14: ...507838 01 Issue 1813 Page 14 of 19 Figure 11 Typical System Wiring Diagram...

Страница 15: ...507838 01 Issue 1813 Page 15 of 19 Figure 12 Typical System Wiring Diagram 460V Single and Three Phase Units 036 048 and 060 only...

Страница 16: ...to provide a barrier between outside air conditions surrounding ambient temperature and humidity and the varying conditions inside the unit If the insulation barrier is damaged wet ripped torn or sepa...

Страница 17: ...a good location Are all access panels in place and secure Check Blower Operation Set thermostat to FAN ON The indoor blower should come on Check Cooling Operation Set thermostat to force a call for c...

Страница 18: ...ng Mode Return Duct Temperature ___________ THERMOSTAT Adjusted and Programmed Return External Static ______ ______ Total External Static ______ ______ 6 Supply Duct Temperature ___________ Temperatur...

Страница 19: ..._____ Total External Static ______ ______ 6 6 Supply Duct Temperature ___________ Temperature Drop ___________ TEMPERATURE RISE Heating Mode Return Duct Temperature __________ Supply Duct Temperature...

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