Carrier T--298 service manual Compressor Replacement, Control Box

3.5.2 Compressor Replacement

Observe the same procedures for rotary compressors as for reciprocating compressors.

a. Follow all safety codes. Reminder: use protective goggles, work gloves, and water soaked quenching cloth.

b. Remove exterior cover. refer to paragraph 3.5.1. Dis- connect all wiring from the compressor.

c.Apply field--supplied, line--tap--valves to the suction and discharge lines as close to the compressor as possible.

d.Recover the refrigerant charge from the unit. After re- covering, cut the discharge and suction line process tubes below the tube crimps. If you choose a good tubing location for cutting the refrigeration lines ini- tially, the location is easily accessible when making the final joints.

WARNING

Oil vapor in piping stubs can ignite from torch flame and cause serious injury. Exer- cise extreme care when brazing, and keep brazing cloth and fire extinguisher handy for emergency use.

e.Connect a nitrogen supply to the unit at one of the line --tap--valve connectors (5--psig maximum flow), leav- ing the other connector open to the atmosphere. Braze angle valves with stubs to each process tube.

f.Remove compressor from unit (3 bolts).

g.Remove line--tap--valves from suction and discharge lines. Carefully braze the holes closed from where the line--tap--valves were removed.

h.Clean system: add or replace liquid line filter drier. For proper cleaning and flushing use a UL approved re- frigerant recycling system.

i.Install new compressor and braze into place with field--supplied copper slip couplings.

j.Connect wiring: replace wire terminals if necessary.

k.Proceed with evacuation and charging (15.9 OZ. --

.45 KG R22). Pinch off lines where angle valves were added. Cut off angle valves above pinch--off , and braze tubes.

l.Start up unit.

3.5.3 Control Box Assembly Removal

To remove the control box assembly, do the following:

a.Remove exterior cover assembly. Refer to paragraph 3.5.1.

b.Remove 2 screws securing control box assembly to the lower scroll assembly. (SeeFigure 3-15.)

Control Box

Screws

Figure 3-15 Control Box

Water

Cover

Figure 3-16 Control Box Removal

c. Slide control box out of the lower scroll assembly. (See Figure 3-16.)

d. To open control box remove 2 screws securing the water cover to the control box cover.

e. Gently lift the water cover off of the control box. (See Figure 3-17.)

f. Reverse above procedure for reassembly.

Control Box

Cover

Figure 3-17 Water Cover Removal

T--298 3-6