Trane Gas Unit Heaters Manuel d'installation télécharger pdf (Page 12)

12 GBNE-SVX001A-EN

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 the BLOWER SET

UP section under step 2.

5. Replace the belt guard.

5. 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 Table 1, the blower motor

rating plate and the rating plate on the unit, respectively

(also see Motor Data on page 13).

Blower Set Up and Adjustment

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 .2" W.C.

If the unit is to be operated under different static air ﬂow or

pressure requirements, the drive ratio must be altered by

means of the adjustable sheave on the blower motor.

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, ensure that the motor and

blower are rotating in a counter clockwise direction

when viewed from the drive side.

5. Measure the current draw of the motor.

CAUTION

The "at speed" current draw of the motor must never exceed

that speciﬁed on the motor rating plate or severe damage to the

motor will result!

CAUTION

Never operate the unit beyond the speciﬁed limits or severe

damage to, and or premature failure of, the unit will result!

WARNING

Never attempt to adjust the drive belt without ﬁrst disconnect-

ing all electrical power to the unit or severe personal injury may

result!

WARNING

Never operate the unit without the belt guard in place of severe

personal injury may result!

Figure 5 - Motor & Blower Assembly *

* PART DESCRIPTION

A. Blower Housing and Wheel

C. Blower Shaft

D. Bearings

E. Drive Pulley

F. Driven Pulley

G. V-Belt

H. Blower Motor

I. Blower Housing Support (LH)

H. Blower Housing Support (RH)

D9000

* NOTICE: THE BLOWER ASSEMBLY FOR THE 100/250 UNITS

CONSISTS OF 1 WHEEL, 1 HOUSING, 1 SHAFT AND 2 BEARINGS.

FOR 300/400 UNITS THE BLOWER ASSEMBLY CONSISTS OF 2

WHEELS, 2 HOUSINGS, 1 SHAFT AND 3 BEARINGS.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 34 35

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Trane Gas Unit Heaters Manuel d'installation Page 12

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