Energy Tech Laboratories DSH Motor and Pulley Data, Blower Speed Adjustment

Page 14

 

 

 

 

 

 

 

 

FORM 145.32-IOM1 (908)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR AND PULLEY DATA

 

 

 

 

 

 

 

 

 

 

EVAPORATOR - STANDARD BLOWER MOTOR AND DRIVE DATA

 

 

 

 

 

 

 

 

Drive Range

 

Motor

 

Adjustable

Fixed

Belts

 

 

Model

 

 

Motor Pulley

Blower Pulley

 

 

 

 

 

 

 

 

 

 

(RPM)

HP

Frame

Eff.(%)

Pitch Dia.(in)

Browning #

Pitch Dia.(in)

Browning#

Rating / Size

 

Qty

 

 

 

 

 

2 TON

845-1170

1/4

56

66.0

2.6-3.6

1VP40 X 5/8

5.4

AK56H

4L370

 

1

 

3 TON

675-1010

1/3

56

75.0

2.0-3.0

1VP34 X 5/8

5.2

AK54H

4L370

 

1

 

4 TON

675-1010

3/4

56

75.0

2.0-3.0

1VP34 X 5/8

5.2

AK54H

4L400

 

1

 

5 TON

745-1120

1

143

75.0

2.0-3.0

1VP34 X 7/8

4.7

AK49H

4L390

 

1

 

CONDENSER - STANDARD BLOWER MOTOR AND DRIVE DATA

 

 

 

 

 

 

 

 

Drive Range

 

Motor

 

Adjustable

Fixed

Belts

 

 

Model

 

 

Motor Pulley

Blower Pulley

 

 

 

 

 

 

 

 

 

(RPM)

 

 

 

 

 

 

 

 

 

 

 

HP

Frame

Eff.(%)

Pitch Dia.(in)

Browning #

Pitch Dia.(in)

Browning#

Rating / Size

 

Qty

 

 

 

 

 

 

 

 

2 TON

770-1070

1/2

56

75.0

2.6-3.6

1VP40 X 5/8

5.9

AK61H

4L500

 

1

 

3 TON

745-1071

3/4

56

82.5

2.0-3.0

1VP34 X 5/8

4.7

AK49H

4L390

 

1

 

4 TON

615-920

1

143

82.5

2.0-3.0

1VP34 X 7/8

5.7

AK59H

4L490

 

1

 

5 TON

770-1070

1.5

145

84.0

2.6-3.6

1VP40 X 7/8

5.9

AK61H

4L500

 

1

 

BLOWER SPEED ADJUSTMENT

The RPM of the supply air and condenser air blow- ers will depend on the required CFM, and the static resistance of both the supply/discharge and the return/ intake duct systems. With this information, the RPM for the blowers can be determined from the blower performance tables. Adjustment of blower speed is accomplished as follows:

1.Loosen belt tension by moving motor towards the blower shaft via the adjustable mounting base.

2.Loosen the setscrew in the adjustable motor pul- ley flange. Remove external key on pulleys 4-in. dia and larger.

3.Blower speed will increase when moveable flange is adjusted towards the fixed flange (closed). Blower speed will decrease when the moveable flange is adjusted away from the fixed flange (opened).

Pulleys are adjustable only in half-turn increments.

Do not open pulley more than five full turns for “4L” and “A” belts, or six full turns for “B” belts.

4.Once the pulley has been opened/closed the ap- propriate number of turns, replace the external key and tighten the adjustment set screw. Proper torque is 110 - 130 in-lbs.

5.Install drive belt and adjust motor mount to tension belt.

14

JOHNSON CONTROLS

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Contents Model DSH Ceiling Mounted Ducted R-410A General Safety Guidelines Read Before ProceedingTable of Contents General Information Typical Installation Drawing Rigging PRE-INSTALLATION Inspection of EquipmentInstallation Unit Mounting Interconnecting Refrigerant Tubing Split Installation Separation of UnitsDimensional Data Dimensional Data Ductwork Louver Sizing GuidelinesSplit System Electrical WiringPackaged Unit FAN Performance Data Standard Motors ModelBlower Speed Adjustment Motor and Pulley DataRefrigerant Charges Pressure Switch SettingsSTART-UP and Operation Typical Schematic Evaporator and Condenser Coils Maintenance / ServiceFilters BlowersLED Description Comfort Alert DiagnosticsInterpreting the Diagnostic Leds Status LED Troubleshooting Information Low line voltage to compressor Installation Verification Labor and Cost not Covered Limited WarrantyCompressor Five Year Limited Warranty Exclusions410A Quick Reference Guide Form 145.32-IOM1

DSH specifications

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