Magic-Pak HWC8-24 - Heat Exchanger Service; Cooling Chassis Removal

Page 15 of 18507388-01 Issue 1504
3. Disconnect the inducer prover switch tubing at the switch.
4. Remove the two screws on the combuson inducer plate.
5. Pull the combuson inducer and plate toward you unl it is
free of the diluon air box that supports it. Lower the inducer
and plate and rotate to pull the assembly out of the
compartment.
6. The ue tube extension can be cleaned if necessary. Leave it
in place; do not remove it from the unit.
7. For reassembly, follow the above steps in reverse order.
Heat exchanger
The heat exchanger should be inspected periodically and cleaned
if necessary. When cleaning use a s brush with a wire handle
to remove scale and soot. To access the heat exchanger tubes
for cleaning:
1. Remove the burner & manifold assembly as described
previously.
2. Remove the combuson inducer as described previously.
3. Remove the four screws securing the diluon air box to the
ue collector box.
4. Remove the nine or twelve screws (depending on model)
securing the ue collector box to the vest panel.
5. Using the wire brush, brush out the inside of each heat
exchanger tube from the burner assembly end and from the
ue collector box end.
6. Brush out the inside of the ue collector box.
7. Brush out the inside of the ue tube extension.
8. If soot buildup is excessive, clean the combuson inducer
wheel and housing.
9. When brushing is complete, blow all brushed areas with air.
Vacuum as needed.
10. For reassembly, follow the above steps in reverse order.
Cooling Chassis
The refrigeraon system contained in the cooling chassis normally
requires no maintenance since it is a closed, self-contained
system. System is charged with R410A refrigerant. Periodic
maintenance is limited to:
• Cleaning the air lter. Follow direcons noted on the lter
and label aached to the access panel.
• Cleaning the condenser coil if covered with any foreign
material, lint, leaves, or other obstrucons.
If servicing or major repairs are required, the complete chassis
can be removed from the unit. To remove the chassis:
1. Shut o the main power supply.
2. Remove filter access panel and panel covering cooling
controls.
3. Remove drain hose from the drain pan.
4. Disconnect the plug-in electrical connections. Do not
seperate the connector by pulling on this wire; instead, grasp
the connector handle.
5. Disconnect two power leads at contactor (leads come from
Grommet in unit paron).
6. Remove screws from panel directly in front of blower and
remove panel. Also remove addional screws located near
top edge of control panel.
7. Drape power wires and wire harnesses out of cabinet and
tape to upper panel.
8. Slide out the chassis, being careful not to damage any seals
or parts. Parcular care should be taken to insure wiring is
not damaged during removal/reinstallaon process.
To reinstall the chassis, reverse the procedure outlined above.
Be sure that the chassis is inserted as far back as it will go before
replacing the screws. Side anges on the chassis must be engaged
with sealing strips on the unit sides to prevent water and air
leakage. Reconnect the wire harness, reconnect the power
leads, and replace both access panels before turning on the main
electrical power. Tubing is not to be used as a handle.