JOHNSON CONTROLS
17
SECTION 2 - START-UP AND OPERATION
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
2
6. On Solution units, verify that the tie down bolts
are removed from the four corners of the fan base
assembly as shown in
. For
small AHUs, the tie down bolts may only be ap-
plied to three corners of the fan base since one
corner is not accessible.
Do not remove the shipping bolts if there
are no springs.
FIGURE 3 -
FAN AND MOTOR ISOLATOR
SUPPORT FRAME
LD09638
Tie Down Bolts
Inspecting Belts and Sheaves
1. Verify that the sheaves are properly aligned and
tight on the shaft. Improper sheave alignment
and belt tension are potential causes of excessive
noise and vibration, and shortened belt and bear-
ing life. Refer to
in
this manual for more information.
2. Check the belt tension. If not familiar with the
process, refer to
in this manual
.
It is normal for belts to loosen af-
ter start-up. The new belts will run in or take a set
by seating slightly deeper into the grooves of the
sheaves. Recheck the tension after one day, and
three days.
3. Make sure the motor mounting bolts and adjust-
able motor base bolts are tight.
Checking Isolators
Solution XT Isolators
Check the fan base isolators and thrust restraints for
proper adjustment.
•
Standard fan isolation consists of spring isolators
mounted un-
der the internal fan assembly.
•
For thrust restraint adjustment procedures, if ap-
plicable, refer to the service manual.
•
Prepare the fan isolators for operation, using the
following instructions:
1. After removing the tie down bolts from the
internal fan assembly, check the blower/mo-
tor frame for the correct height, and that the
frame is level.
2. To adjust the isolators as shown in
,
a. Loosen the cap screws on top of the ad-
justment bolt.
b. Turn the adjusting bolt.
c. Check the operational height and level
of the frame. Repeat this procedure until
the height and frame are level.
d. Tighten the cap screws. Refer to the ser-
vice manual for additional instructions.
•
Verify the fan is aligned with the AHU discharge.
•
Readjust the isolators as necessary.
FIGURE 4 -
SPRING ISOLATOR
LD09637
