Magic-Pak V Series, Руководство по установке, Страница: 19 / 21

Page 19 of 21 507389-01 Issue 1504
Heat exchanger removal and cleaning
1. Remove the heat exchanger access panel
2. Remove the combustion inducer as described previously.
3. Disconnect the two orange leads from the primary limit
switch at the vest panel.
4. Disconnect the upper and lower drain hoses from the
condensate drain.
5. Remove the four screws at the rear vest panel flange.
6. Remove the three screws at the bottom vest panel flange.
7. Remove the three screws on the top panel of the unit that
secure the vest panel.
8. Disconnect the supply air duct if it cannot be lifted slightly
to allow the top panel to be tilted upward.
9. Remove the two screws closest to the front of the unit on
each side of the top panel so it can be tilted upward.
10. Tilt the front edge of the top panel upward and remove the
heat exchanger assembly from the cabinet. Take care to avoid
damaging insulation or other components.
11. With the heat exchanger assembly out of the cabinet, remove
the twelve screws securing the hot end header box to the
rear end sheet.
12. Remove the turbulators from the secondary coil tubes.
13. Back wash the heat exchanger with soapy water solution
or steam. If steam is used its temperature must be below
275°F (135°C).
14. Thoroughly rinse and drain the heat exchanger. Soap
solutions can be corrosive. Take care to rinse the entire
assembly.
15. For reassembly, follow the above steps in reverse order.
Cooling Chassis
The refrigeration 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 filter. Follow directions noted on the filter
and label attached to the access panel.
• Cleaning the condenser coil if covered with any foreign
material, lint, leaves, or other obstructions.
If servicing or major repairs are required, the complete chassis
can be removed from the unit. To remove the chassis:
1. Shut off 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 partition).
6. Remove screws from panel directly in front of blower and
remove panel. Also remove additional 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. Particular care should be taken to insure wiring is
not damaged during removal/reinstallation 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 flanges 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.