Carrier 38EC - Manual (Page 8)

Correct use of Chargemaster ensures that an opti­
mum refrigerant charge will be in system when con­
ditions
and system components are normal.
However, the Chargemaster does not solve or fix
system abnormalities. It indicates correct charge for
condition of the system. It will not make corrections
for dirty filters, slow fans, excessively long or short
suction lines or other abnormal conditions. This
charging device ensures that a correct relationship
exists between outdoor temperature, evaporator
temperature, and suction line temperature on a spe­
cific system.
SIGHT GLASS METHOD — (Field-supplied sight
glass installed in liquid line.) A satisfactory oper­
ating charge can be obtained on thermal expansion
valve systems only by charging to a clear sight glass.
For optimum charge, increase high-side pressure to
380 ± 10 psig by blocking condenser fan discharge
or air entering condenser. Charge to a clear sight
glass while holding constant high-side pressure. For
peak efficiency, adjust charge to yield a liquid refrig­
erant temperature at the evaporator that is approxi­
mately the same as outdoor dry-bulb temperature.
SERVICE
Compressor Removal — See Table 8 for com­
pressor information and Fig. 7 for component loca­
tion. Shut off power to unit. Remove refrigerant
from unit using refrigerant removal methods de­
scribed in Carrier Standard Service Techniques
Manual, Chapter 1, Refrigerants. Be sure system
pressure is 0 psig before attempting eompressor
removal.
^ Table 8 — Compressor Data
UNIT PRODUCTION OIL CHARGE (oz)t
38EC COMPR* Initial Recharge
018300 AJ8520G 26 24
024300 CRD-0200PFV 55 51
030300 CRF1-0250PFV Ì; 55 51
036300 CRJ1-0300PFV 55 51
042310 AV5542E 54 50
048300 YRD-0400-PFV 72 68
048310 PC5016BD 66 62
060300 PC6416AG 66 62
030500 CRF1-0250-TF5 55 51
036500 CRJ1-0300-TF5 55 51
042510 AV5542E 54 50
048500 YRD6-0400-TFC 72 68
048510 PY5016BD 66 62
060500 PY6416AF 66 62
036600 CRJ1-0300-TFD 55 51
042610 AV5542E 54 50
048600 YRD6-0400-FFD 72 68
048610 PH5016BD 66 62
060600 PH6416AF 66 62
CRANKCASE HEATER SWITCH
SUCTION LINE
LOW
PRESSURE
SWITCH
HOT GAS
DISCHARGE LINE
CONDENSER COIL
COMPRESSOR
DISCHARGE GRILLE (FAN
MOTOR UNDERNEATH) ^
WIRE ACCESS OPENING
TOP COVER-
HIGH-
'/ PRESSURE
SWITCH
FAN MOTOR
AND
COMPRESSOR
LEADS
PLASTIC PIN
OF TUBE
lì SUPPORT
'Refer to Carrier Service Parts Catalog for replacement model
numbers
tWhere piping exceeds 50ft, obtain information from local Carrier
distributor
Fig. 7 — Condensing Unit 38EC
Component Locations
Follow safety codes. Wear safety glasses and
work gloves. Have quenching cloth available.
CAilTIOMi
m iufeisjg or doroags tmy
1. Remove top cover: remove 3 screws holding
top cover to connector plate; remove third screw
clockwise from connector plate; loosen remain­
ing 5 screws; lift cover straight up.
2. Disconnect high- and low-voltage field wiring
and fan motor leads from capacitor and
contactor.
3. Remove 4 screws (38FC018 thru 030) or 8 screws
(38FC036 thru 060) holding discharge grille in
place. Lift grille from unit.
4. Disconnect compressor leads (crankcase heater,
low-pressure switch, if so equipped) from elec­
trical components and pull them thru the wire
access opening into the coil section. Lift fan
orifice/control ring after pinching and pressing
down on 3 plastic pins of tube supports.
5. Remove louvered casing by taking out 16 screws
securing it to the cabinet and sliding it away
from the coil.