5
Mounting
Kooltronic Special Purpose Heat Exchangers have been engineered to be installed easily.
These units use fully gasketed flanges to insure a seal between the heat exchanger and
the cabinet. This seal is necessary to maintain the integrity of the closed loop system as
well as the NEMA 4 rating.
Prior to mounting, refer to page 6 for general arrangement drawings showing dimensions
and locations of mounting holes and cutouts. Prior to cutting or drilling, make sure that
cutouts and mounting holes do not interfere with components inside of the cabinet. To
avoid damaging your Heat Exchanger, please read the following information before
installation.
1. Remove and discard (2) nuts and washers holding the Mounting Template and
Assembly Bracket (M/TAB) to the Heat Exchanger. Remove M/TAB.
2. See page 6 for proper orientation. Place the M/TAB flush against the outside of the
cabinet to locate cutouts and M/TAB mounting holes.
The minimum distance
between lower end of the M/TAB to the ground is 12” for all KNHX units.
3. The cutout for warm air return does not have to match the full opening on the
M/TAB. You can locate your cutout anywhere within this opening, making the return
air cutout from the cabinet as large as possible. Make the cold air supply cutout the
same size as on the M/TAB.
4. Mount the M/TAB to the outside of the cabinet using all the 1/4-20 x 1/2” bolts,
washers and nuts supplied by Kooltronic.
5. Route the power cord through the return air cutout of the cabinet. Mount the heat
exchanger on the M/TAB by sliding the mounting studs, installed on the heat
exchanger side panels, into the inclined slots of the M/TAB.
6. Carefully mark all mounting holes from the flanges of the heat exchanger to the
cabinet wall. All holes in the heat exchanger flange must be used to maintain the
NEMA 4 rating.
7. Remove the heat exchanger from the M/TAB and drill .218” dia. mounting holes in
the cabinet. Do not attempt to drill mounting holes in the enclosure without first
removing the heat exchanger. Drilling through the sealing gasket may damage it
and remove the NEMA 4 rating.
8. Repeat actions, described in item “5” above.
9. Insert the stainless steel screws with seal washers supplied through holes in the
mounting flanges and the cabinet wall. Install washers and nuts on each screw
from inside of the cabinet and hand tighten. Tighten all nuts to a torque of 20 in.-
lbs. going in a clockwise rotation starting from the top left corner. Retighten to a
final torque of 34-40 in.-lbs. in the same rotation as previously used. The torque
should be rechecked after the gasket has been allowed to set for 1 hr. and again
after the heat exchanger has been run for 24 hrs. Check the flange gasket com-
pression, after tightening all nuts - the gasket should be compressed by approx-
imately 1/2 the gasket thickness (1/8”).
10. After making sure that the source voltage and frequency are the same as shown on
the unit nameplate, connect the heat exchanger’s power cord to the power supply.
CAUTION
If the Heat Exchanger is mounted to the cabinet door you must be sure that
the door hinges will support the additional weight of the Heat Exchanger. Also
be certain that when the door is opened fully, the cabinet does not become
unbalanced. The actual weight of the unit can be found in the performance
specifications.
