KAH Operation & Maintenance Guide
Page: 37 of 88
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
SECTION 3 - MAINTENANCE (CONTINUED)
INSPECT PARTS
Inspect the following parts for damage, dirt and debris.
Cabinet
Clean the exterior of the AHU with a mild, environmental
safe detergent and high-pressure water at 2000 psi.
Door Hardware and Gaskets
Inspect the doors, handles, latches and hinges for proper
operation, and the door gaskets for damage and if they are
properly sealed. Secure any loose parts.
Panels
Inspect the panels for damage. If the panels show signs
of excessive pressure change, they will appear to bulge
inward or outward. Refer to the Troubleshooting Guide
regarding excessive static pressure. If the panel needs to
be replaced, use the instructions later in this section.
FAN SEGMENT (SUPPLY, RETURN, OR EXHAUST)
Removing the Fan
If necessary, remove the fans for cleaning. Clean the fan
with detergent or solvent that is environmentally safe. If
water pressure is used, do not direct the water stream
onto the bearing seals.
NOTE -
Forward curved fan wheels are more
susceptible to dirt accumulation than other
wheels. Dirt and debris on fan wheels and shafts
may adversely affect the balance of the fan
assembly.
Refer to the information later in this section to replace the
fan and fan assembly components.
Checking the Fan
Check the following fan parts for damage, wear, loose
parts, and debris:
1. Fan housing, wheel, shaft, frame and bearings
2. Fan base, vibration isolators and optional thrust
restraints
3. Flex connector. Make sure the fan assembly does not
rub the flex material.
4. Drive kit, which consists of belts, sheaves and sheave
bushings. Check for belt tension.
The actual data required by design of each fan assembly
is listed on the tag affixed to the fan housing near the belts
as shown in Figure 34 (right).
FIGURE 34 - TYPICAL DRIVE KIT DATA TAG
FIGURE 35 - ADJUSTABLE MOTOR BASE
Drive Bolt
Assembly
Hold Down Bolt
Assembly
Place Wrench On Nut
Through Service Hole
OPERATING ADJUSTABLE MOTOR BASE
Standard
1. Secure the nut with a wrench placed through the
service hole and loosen the bolt. Do this to all four
holddown bolt assemblies as shown in Figure 35
(below).
2. Make sure the drive bolt assembly threads are lightly
lubricated.
3. Turn both drive bolt assemblies in the same direction
to move motor for belt installation and tensioning.
4. Turn drive bolt assemblies independently to move
motor for sheave/belt alignment.
5. Tighten all four holddown bolt assemblies.
For belt tensioning instruction, refer to Sheave Alignment.
