Carrier 38EB - Manual (Page 8)

3. Connect Chargemaster outlet port to unit suction
valve service port.
4. Crack valves on refrigerant drum and Charge-
master to purge lines from drum to suction valve.
After purging lines, close valve on Chargemaster
only.
5. Measure outdoor air dry-bulb temperature.
6. Crack unit suction valve and read evaporator
temperature at red needle position on Charge-
master temperature gage and suction line tem­
perature at black needle position.
1. Énter Chargemaster Charging Chart, Table 7, at
outdoor air temperature (step 5) and evaporator
temperature (step 6). Find the suction line tem­
perature required for correct system charge. If
actual suction line temperature (step 6) is higher
than table value, the system is undercharged. If
suction line temperature is lower than table
value, system is overcharged.
EXAMPLE: At outdoor air temperature of 84 F
and evaporator temperature of 43 F, the system
will be correctly charged at 76 F ± 2 F suction
line temperature. See Table 7.
8. Add charge by slowly opening Chargemaster
valve. If necessary, reduce charge by bleeding at
liquid line service valve. Check outdoor air and
evaporator temperature during procedure. If they
change, refer back to Chargemaster Charging
Chart.
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.
r
Table 7 — 38EB Chargemaster® Charging
Chart (AccuRater™ System)
SERVICE
OUTDOOR
TEMP
(F)
EVAPORATOR TEMPERATURE (F)
2TT25l^l3TT34T37^
SucüônUnëT^^ (f )
60 32 40 51
62 30 38 3ê ta
64 28 37 47 60
66 27 35 45 57 ta
68 34 43 54 67
ta
70 32 41 52 64
72 31 39 50 61 72 1
74 30 37 48 58 69
76 29 36 46 56 66
78 27 35 44 54 63 75
80 26 33 42 52 61 72
82
86
32
29
40
*
37
50
46
59
65
68
63
m
73 85
88 35 44 53 61 70 81
90 34 42 51 59 68 78 90
92 33 41 49 57 65 75 86
94 39 47 55 63 72 83
96 38 45 53 61 70 80
98 36 44 51 59 67 77
100 42 49 57 65 75
102 41 48 55 63 73
104 39 46 53 61 70
106 45 51 59 68
108 43 49 57 65
110 41 47 55 63
112 46 53 61
114 50 59
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 compressor
removal.
■ Table 8 — Compressor Data
UNIT
38EB
PRODUCTION
COMPR*
OIL CHARGE (oz)t
Initial Recharge
015301 AJ8516G 26 24
018301 AJ8520G 26 24
024301 CRD1-0200PFV 55 51
030301 CRF1-0250PFV 55 51
036301 CRJ1-0300PFV 55 51
042361 AV5542E 54 50
048311 YRD-0400-PFV 72 68
048351 PC5016BD 66 62
060351 PC6416AG 66 62
Example
‘Refer to Carrier Service Parts Catalog for replacement model
numbers
fWhere piping exceeds 50ft, contact your local Carrier distributor