CLEANING - TM-9-4120-423-14-P0429

TM9 4120-423-14&P

Discharge the Refrigerant R-22 system per WP0070.

NOTE

Wrap wet rags near joints being brazed. Use tape to cover open joints.

Remove high-pressure switch. (See WP0085).

Remove low-pressure switch. (See WP0086).

Remove compressor. (See WP0097).

Remove solenoid valve L1, bracket, and related piping. (See WP0093 and WP0094).

Remove relief valve and related piping. (See WP0087).

While purging the system with nitrogen, debraze the remaining tubing from the coil and area of

the coil. (See WP0071 and WP0072).

Using screwdriver, remove the ten screws that attach the coil to the housing.

WARNING

When handling coils, wear gloves to avoid cuts and reduce fin damage on the coil.

Carefully tilt coil and remove from left end.

CLEANING

Clean coil with a soft bristled brush, vacuum cleaner and brush attachment, or use compressed air at 30

psi or less from the inside of the coil to blow the dirt out. Take care to avoid fin damage. When using

compressed air, wear safety glasses or goggles. Dirt can be blown into your eyes.

REPAIR OR REPLACEMENT

Repairs are limited to replacement of nut plates, rivets, and the straightening of mashed fins.

Plate nuts may be removed by drilling out the old rivets using a drill bit slightly smaller that the

diameter of the rivet.

Install new plate nut(s) and rivets.

If fins are mashed or dented so that the airflow across the coil would be blocked, straighten them

using a plastic fin comb.

0095 00-3