Carrier 50HQ - Manual (Page 11)

8. Add charge by slowly opening Chargemaster
valve. If necessary, reduee charge by bleeding at
liquid line Schrader valve. Check outdoor air
and evaporator temperature during procedure.
If they change, refer back to Chargemaster
Charging Chart for new value.
Correct use of Chargemaster ensures that an
optimum refrigerant charge is in system when
conditions and system eomponents are normal.
However, the Chargemaster does not solve or fix
system abnormalities. It indicates correct charge
for condition of system. It does not make correc­
tions for dirty filters, slow fans, or other abnormal
conditions. This charging device ensures that a
correct relationship exists between leaving water
temperature, evaporator temperature, and suction
line temperature on a specific system.
Table 6 — Compressor Data
UNIT
50HQ,VQ
V/PH
PRODUCTION
COMPRESSOR
OIL
RECHARGE
(oz)
AJ5513F
018 AB5519F 32
022 MD2023FE 42
027
033
208/230-1
MD2423FE
MD3423FE 42
42
042 MD4023FE 42
048 PC4616AD 72
060 PC6016AD 72
033 MF3423FE 42
042 MF4023FE 42
048 208/230-3 PY4616AD 72
060 PY6016AD 72
080 PY7716AF 72
033 IV1H3423FE 42
042 MH4023FE 42
048 460/3 PH4616AD 72
060 PH6016AD 72
080 PH7716AF 72
4. Disconnect compressor wiring at compressor
terminal box.
5. Using a tubing cutter, cut suction and dis­
charge lines at convenient place near com­
pressor for easy reassembly to new compressor
with copper slip couplings.
CAU'nON: Excessive movement of copper
lines at compressor may cause a break
where fines 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
eompressor.
9. Clean system.
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.
CAUTION: Before performing recomatended
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.
Compressor Removal
See Tableó for compressor information and*.
Fig. 7 for component location. Follow safety codes,
and wear safety glasses and work gloves. Have
quenching cloth available (step 7).
CAUTION; Copper tubing and aluminum fins
are used in 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 electrical shock. Remove unit com­
pressor section access panels, Fig. 1 and 5.
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.
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.
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