KAH Operation & Maintenance Guide
Page: 53 of 88
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | kruegerinfo@krueger-hvac.com | www.krueger-hvac.com
How to Measure, Assemble and Install
How to Measure - Pull belt tight around pulleys
to check hand tight length, overlapping the
last two tabs with two holes in matching links
as shown. Count the number of links and
remove one link for every 24 of 3L, Z/10, A/4L
and B/5L sections, and one link for every 20
of C and D sections. This gives the correct
installed belt length and will ensure optimum
belt tension when running.
SECTION 3 - MAINTENANCE (CONTINUED)
NOVELAIRE® TECHNOLOGIES
Cleaning the Wheel
The wheel should be protected by an ASHRAE 30% filter to keep dust
and dirt from the heat transfer surface. If the wheel becomes dirty,
it may be cleaned by blowing out the unit with compressed air (20
psig maximum). In cases of severe uncleanliness, the wheel may be
removed from the cassette and washed with flowing water. Wheel
removal procedures are outlined below:
1. Disassemble air handler panels and bulkheads only enough to
gain access to front or rear of wheel where necessary or where
there are no doors.
2. Support the wheel from the bottom.
3. If the unit is equipped with an external flanged bearing, loosen the
allen screws in the bearing housing that keeps the shaft affixed
in the horizontal plane on both bearing, front and back. Remove
the shaft clips at the face of the hub from both sides of the
shaft. Unbolt one post completely and remove post with bearing
completely out. Remove the shaft. Roll the wheel carefully out.
4. If the unit is equipped with an internal bearing, unbolt the shaft
screw on both sides of the shaft. Unbolt one post completely and
remove post. Remove the shaft clips at the face of the hub from
both sides of the shaft. Remove the shaft. Roll the wheel out
carefully
5. With the wheel out, wash the media carefully with water. Once
clean, allow the media to dry out for several hours or days if
necessary.
6. Reinstall using the reverse procedure. Run the unit. It may take
several hours for the desiccant to dry out and for the wheel to
perform normally.
Adjusting Air Seals
The seals are designed to be durable and require no maintenance
other than adjustment. But, if the seals become worn or damaged,
replace them. Clip the seals to the cassette or post metal.
Inspect Wheel Drive Components
Bearings - Small wheels are equipped with no maintenance inboard
bearings, which should require no maintenance during the life of the
AHU. Larger wheels come equipped with an external flanged bearing,
which should be greased annually with a petroleum-based lubricant.
Drive Motor - The drive motors should require no maintenance. If the
motor needs to be replaced, Replacement motors may be purchased
from normal motor distributors.
Drive Belts - Wheel belts are multi-link belts with individual links
constructed of a high performance polyurethane elastomer, which is
reinforced with multiple plies of polyester fabric. This belt provides
strong, yet flexible belting. The multi-link feature provides quick, easy
servicing or replacement.
NOTE -
Every tenth link is designated
with an arrow (g) (3L, Z/10, A/4L and
B/5L only). For multiple belt drives,
ensure that each belt has the same
number of links.
FIGURE 62 - HOW TO MEASURE
IMPORTANT
- Turn belt INSIDE OUT
(as shown) to ensure easy assembly and
disassembly.
Disassembly (See Figure 63, next page)
A. Hold belt upside down. Bend back as
far as possible; hold with one hand.
Twist one tab 90° parallel with slot.
B. Pull end of link over tab.
C. Rotate belt end with tab 90°.
D. Pull belt end through two links.
Assembly (See Figure 64, next page)
A. Hold belt with tabs pointing outward.
B. Place end tab through two links at
once.
C. Flex belt further and insert second
tab through end link by twisting tab
with thumb.
D. Ensure tab returns to position across
belt. Reverse belt so tabs run inside.
