Carrier 50WQ - Manual (Page 10)

Compressor Removal — See Table 6 for com­
pressor information and Fig. 5 for component loca­
tion. Follow safety codes, and wear safety glasses
and work gloves. Have quenching cloth available
(step 7).
Table 6 — Compressor Data
CAUTION: Copper tubing and alaminum fins
are used in 50WQ unit coils. Do not overheat or
place excessive strain on tubing or damage may
result.
1. Shut off power to unit. Failure to do so may
result in electric shock. Remove unit com­
pressor section access panels, Fig. 1.
2. Remove refrigerant from unit using refrigerant
removal methods described in Carrier Standard
Service Techniques Manual, Chapter 1.
3. Remove core from suction and discharge line
Schrader valves.
4. Disconnect compressor wiring at compressor
terminal box.
5. Using a tubing cutter, cut suction and discharge
lines at convenient place near compressor for
easy reassembly to new compressor with copper
slip couplings.
CAUTION: Excessive movement of copper
lines at compressor may cause a break
where lines connect to coil.
6. Remove compressor hold-down bolts and lift
compressor out.
7. Carefully unbraze suction and discharge line
piping stubs from compressor. If oil vapor in
piping stubs ignites, use quenching cloth.
8. Braze piping stubs (removed in step 7) on new
compressor.
9. Clean system. Add new suction line filter-drier
as described below.
10. Install new compressor in unit. Braze suction
and discharge lines to compressor piping stubs
(at points where cut, step 5) using field-supplied
copper couplings. Ensure compressor hold-
down bolts are in place. Connect wiring.
11. Evacuate and recharge unit.
Filter-Drier — Install a filter-drier in compressor
suction line when refrigerant system is opened for
service as described under Compressor Removal.
Check filter-drier pressure drop at drier service port
and unit suction line Schrader fitting. Ensure
pressure drop does not exceed 2 psi.
MODEL
50WQ_
014 ~
018
022
027
033
0 «
033
042
""^033 "
042
V/PH
PRODUCTION
COMPRESSOR
208-230/1
AJ5518E
AB5519F
MD2023HB
MD2423HB
MD3423HB
230/T MD4023HB^
208-230/3
MF3423HB
MF4023HB
460/3
" MH"3423HB ^
MH4023HB
OIL
RECHARGE (ozj^
24
32
42
42
42
42
42
MAINTENANCE
CAUTION: Before performing recommended
maintenance^ be sure main power switch to unit
is turned off.
Lubrication
COMPRESSOR contains factory oil charge. Re­
place oil when lost. See Table 6 for oil recharge. If
necessary, refer to Carrier Standard Service Tech­
niques Manual, Chapter 1, pages 1-21, for oil
recharging procedure. Use Carrier PP33-1, Texaco
Capella B or Suniso 3G oil.
FAN MOTOR BEARINGS are prelubricated for 3
years heavy-duty or 5 years normal-duty service.
When lubrication is necessary, send motor to
authorized motor repair shop.
Cleaning Coil and Condensate Pan — Clean and
inspect coil, condensate pan and drain before each
cooling season.
1. Remove coil section access panels and slide air
filter out of filter flanges.
2. Disconnect condensate drain line at pan drain
connection.
3. Use vacuum cleaner nozzle to clean the face of
coil.
4. Clean condensate drain trap with a bottle brush.
Clean condensate pan.
5. Hold pail under condensate pan drain connec­
tion and flush pan out with clean water. Ensure
water flows freely thru condensate drain. Do not
overflow pan.
6. Reconnect condensate drain line.
7. Install access panel and air filter.
10