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Reznor MAPS IV Option - Installation - Energy Recovery Module Installation User Manual

Page 9

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I-MAPSIII&IV-ER, PN262634R3, page 9

Removing, Cleaning, and Replacing Wheel Segments - The segments are the “heat

exchangers” of the energy recovery wheel. Segments must be handled with care and

should never be dropped. Segments may require “slight” persuasion during installation

and removal but NEVER be forced or banged with a hammer or similar tool.

Instructions:

1. Turn off power to the unit and lock the disconnect

switch open.

2. Slide the wheel cassette out of the cabinet (refer to

illustration, page 7).

Remove the wheel segments (from the pulley side of

the wheel)

a) Rotate the wheel to position the first segment to be

removed at the top. On both sides of the segment,

unlock and open the two retaining straps.

b) Using hand pressure only and supporting the

segment, from the motor side push the wheel

segment. On the pulley side, lift the segment out of

the spokes. Lay, do not drop, the segment on a flat

surface

c) Rotate the wheel so that the segment on the

opposite side is on the top. Repeat the procedure

and remove the segment. Continue the procedure

of keeping the balanced open and filled segments

opposite each other and remove all of the

segments.

3. Clean the Wheel Segments

a) Gently brush off any loose dirt and dust.

b) To wash the segments, use a non-acid based

(evaporator) coil cleaner or alkaline detergent

solution. Non-acid based coil cleaner concentrate

in a 5% solution is recommended by the

manufacturer. Do not use any of the following as

they may cause damage to the wheel.

DO NOT use an acid based cleaner.

DO NOT use aromatic solvents.

DO NOT use temperatures in excess of 170°F.

DO NOT use a pressure washer.

DO NOT use steam.

Soak the segments in the cleaning solution

until grease and tar deposits are loosened. An

overnight soak may be required to adequately

loosen heavy deposits of oil based contaminants.

CAUTION

DO NOT use acid based cleaner, aromatic

solvent, steam, temperatures in excess of

170°F, or a pressure washer, as damage to

the wheel may occur.

Rinse the dirty solution from each segment until the water

runs clear.

NOTE: Some staining of the desiccant may

remain and is not harmful to performance. Allow excess

water to drain from the segments before reinstalling

them in the wheel. (

NOTE: A small amount of water will

dry out in the airflow.)

4. Replace or Re-install Clean Wheel Segments (from

pulley side of wheel)

a) Remove any dirt or dust from the wheel frame and

cassette and the slide-in area of the cabinet.

WARNING

Weight of the installed segments will

cause the wheel to accelerate in rotation.

Failure to maintain control of the wheel

rotation while re-installing all segments

could cause severe injury to fingers or

hand caught between revolving spokes

and the bearing support beam. Insert

the handle of a hammer or other such

tool through the spokes above or below

the bearing support as a stop to limit

rotation of an unbalanced wheel.

b) Position one segment opening at the top of the

cassette. Insert a “stop” (see warning above) to hold

the wheel in place. Unlock and open the segment

retaining brackets on both sides of the opening.

Position a clean segment with the imbedded

stiffeners toward the motor side of the wheel.

Holding the segment as vertically as possible and

centered between the spokes, insert the nose of

the segment downward between the hub plates.

Ease the segment down until its outer rim clears the

inside of the wheel rim and press it inward against

the spoke flanges. Close and latch the retaining

brackets. Make sure each retaining bracket is fully

engaged under the catch.

c) Remove the stop and slowly rotate the installed

segment to the bottom of the wheel. Re-insert the

stop and repeat the procedure to put a segment in

the top position. Continue the procedure, balancing

the wheel by installing opposite segments, until all

of the segments are in place.

d) While the wheel cassette is out, follow the instructions

below to check the seals and the drive components.

e) After all wheel maintenance is complete, slide the

casette back into the cabinet. Re-connect the motor

wire. Being sure the cassette is positioned properly,

replace the center post.

According to the manufacturer, a wheel operating in a “clean” environment may not

require annual cleaning, but a wheel in a “contaminated” environment may require mul-

tiple cleanings a year to maintain airflow and recovery. The segmented design of the

wheel not only provides for easier cleaning but also allows for replacement of individual

dirty segments. (See replacement P/N’s on page 10.).

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