Trane Gas Unit Heaters Manuel d'installation télécharger pdf (Page 26)

26 GKND-SVX01B-EN

Start-Up

Blower Set Up

The drive ratio of the motor and blower sheaves has been

preset at the factory for a temperature rise of 65°F at 0” wc

with no external duct work on system. If the unit is to be

operated under different air flow or pressure

requirements, the drive ratio must be altered by means of

the adjustable sheave on the blower motor (see Figure 20,

p. 26).

1. Ensure that all packing material, support blocks, etc.

have been removed from the unit.

2. Adjust the blower drive belt tension by means of the

two tension bolts on the blower motor base. When

proper tension has been achieved, the mid-point

deflection of the belt will be 3/4” when subjected to a

5 lb. force.

3. Recheck all electrical connections.

4. When power is applied, ensur

e that the motor and

blower are rotating in a clockwise direction when

viewed from the drive side.

5. Measure the current draw of the motor.

Blower Drive Adjustment

1. Remove the belt guard and loosen the belt tension

bolts on the blower motor base.

2. Loosen the set screw on the adjustable half of the

motor sheave. To increase the blower speed, turn the

adjustable half of the sheave clockwise, counter

clockwise to slow the blower. Retighten the set screw.

3. Realign the blower and motor sheaves if necessary.

4. Adjust the belt tension as specified in “Blower Set Up,”

p. 26, Step 2.

5. Replace the belt guard.

6. Check that the air flow of the unit, the rpm and current

draw of the blower motor and the temperature rise are

within the limits specified in Tab l e 1, p. 10, the blower

motor rating plate and the rating plate on the unit,

respecti

vely.

Note: The blower assembly for 100/250 units consists of

1 wheel, 1 housing, 1 shaft, and 1 bearing set. For

300/400 units, the blower assembly consists of

2 wheels, 2 housings, 1 shaft, and 1 bearing set.

NOTICE:

Equipment Damage!

The “at speed” current draw of the motor must never

exceed that specified on the motor rating plate or

severe damage to the motor could result!

WARNING

Drive Belt!

Disconnect all electrical power including remote

disconnect before adjusting the drive belt. Follow

proper lockout/tagout procedures to ensure the power

can not be inadvertently energized. Failure to do so

could result in drive belt turning on unexpectedly,

which could result in serious injury.

WARNING

Belt Guard!

Never operate the unit without the belt guard in place

or severe personal injury could result!

NOTICE:

Equipment Damage!

Never operate the unit beyond the specified limits or

severe damage to, and/or premature failure of, the unit

could result!

Figure 20. Motor and blower assembly

Part Description

1. Blower Housing

2. Blower Wheel

3. Blower Shaft

4. Bearings (sets only)

5. Drive Pulley (standard)

6. Driven Pulley (standard)

7. V - B e l t

8. Motor

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 42 43

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Trane Gas Unit Heaters Manuel d'installation Page 26

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