Carrier 50HQ - Manual (Page 11)

CHARGEMASTER® DEVICE OPERATION —
Operate unit 10 minutes before using Charge-
master. Ensure unit indoor fan section access panel
is in place for proper Chargemaster operation.
1. Tape Chargemaster feeler bulb to unit suction
line. Insulate bulb. Ensure suction line is clean
for good contact with bulb.
2. Connect refrigerant drum to Chargemaster inlet
port with drum in position for vapor charging.
3. Connect Chargemaster outlet port (loosely) to
unit suction line Schrader valve.
4. Crack valves on refrigerant drum and Charge-
master to purge lines from drum to suction line
Schrader valve. After purging lines, close valve
on Chargemaster only. Tighten Chargemaster
connection at suction line Schrader valve.
5. Measure unit leaving water temperature.
6. Read evaporator temperature at red needle
position on Chargemaster temperature gage and
suction line temperature at black needle
position.
CAUTiON: Do not read evaporator tempera­
ture with Chargemaster valve open.
7. Enter 50HQ,VQ Chargemaster Charging Chart,
Table 5, at unit leaving water temperature (step
5) and evaporator temperature (step 6). (Do not
use standard charging chart on cover of Charge-
master.) Eind the suction line temperature
required for correct system charge. If actual
suction line temperature (step 6) is higher than
table value, the system is undercharged. If suc­
tion line temperature is lower than table value,
the system is overcharged.
Example: At leaving water temperature of 93 F
and evaporator temperature of 41 F, the system
is correctly charged at 50 F ( ± 2 F ) suction line
temperature.
8. Add charge by slowly opening Chargemaster
valve. If necessary, reduce 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 components 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)
014 AJ55Ì3F 24
018 AB5519F 32
022 MD2023FE 42
027
033
208/230-1
MD2423FE
MD3423FE 42
42
042 MD4023FE 42
048 PC4616AD 72
060 PC6416AG 72
033 MF3423FE 42
042 MF4023FE 42
048 208/230-3 PY4616AD 72
060 PY6416AF 72
080 PY7716AF 72
033 MH3423FE 42
042 MH4023FE 42
048 460/3 PH4616AD 72
060 PH6416AF 72
080 PH7716AF 72
Table 5 — Chargemaster Charging Chart
UNIT
LEAVING
WATER
TEMP
(F)
EVAPORATOR TEMP (F)*
30 33 36 39 41 44 47 50 53 56
Suction Line Temp (F)
69 46 49 51 54 57 59 61
75 45 47 50 53 55 58 60 64
81 46 49 51 54 56 57 63
87 48 50 52 54 56 62 65
93 46 48 50 53 55 57 61
99 47 49 51 54 56 61 64
105 45 47 50 53 56 60 63
112 46 49 53 55 59 62
117 45 47 52 55 57 61
123 46 50 53 55 56
Compressor Removal
See Table 6 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).
’Saturated evaporator temperature which is the equivalent tem­
perature of pressure taken at unit suction service valve
CAUTION: Copper tubing and aluminum fins
are used in unit coils. Do not overbeat or place
excessive strain on tubing or dam^e 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.
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