Carrier 38VH - Manual (Page 7)

FAN MOTOR
ORIFICE PLATE
ASSEMBLY
HATCHBACK
ACCESS DOOR
CONDENSER
COIL
COMPRESSOR
(INSIDE SOUND
SHIELD)
HIGH-LOW-
PRESSURE
SWITCHES
LIQUID VALVE
SERVICE PORT
SUCTION VALVE
SERVICE PORT
Fig. 6 — Condensing Unit 38VH
with Access Door Open
Table 6 — Service Data
UNIT ;
38VHt
R-22 CHG‘ CONDENSER FAN
Lbst Lbs-Ozf
Low Speed hligh Speed
Rpm Cfm Rpm Cfm
001 5 5 5-8 650 2300 800 2800
002 103 10-5 750 2300 900 2800
003 9 1 9-2 750 2300 900 2800
004 9 2 9-3 750 2650 900 3200
045 9 2 9-3 750 2650 900 3200
005 8.1 8-2 850 3150 1050 3900
‘Factory refrigerant charge is adequate when evaporator and con­
densing unit are same size, and are connected with 25 ft or less of
field-supplied tubing of recommended size or 50 ft or less of
Carrier accessory tubing
fNot to be used for 28VH applications See "Weight Method —
28VH Applications "
On systems having field piping in excess of 50 ft,
add refrigerant and oil as shown in Table 9.
Service port connections are provided on liquid
and suction line service valves for evacuation and
charging. See Fig. 6.
TO CHECK, ADJUST OR REPLACE REFRIG­
ERANT CHARGE use method recommended in
Table 7. Details of charging methods are listed
below.
Before recharging system, thoroughly evacuate
system and then weigh in refrigerant charge speci­
fied in Table 6. Check or adjust charge as required.
Refer to Carrier Standard Service Techniques
Manual, Chapter 1, Refrigerants, for additional
system evacuation and dehydration instructions.
WEIGHT METHOD — Refer to Table 6 or unit
nameplate for correct system refrigerant charge. Re­
move any refrigerant remaining in system before
recharging.
When system is not evacuated, subtract the
following amount from total charge.
38VH001,002 —.10 lb (1.6 oz)
38VH003,004,045,005 —.20 lb (3.2 oz)
The Dial-a-charge charging cylinder is an accu­
rate device used to recharge systems by weight.
These cylinders are available at refrigerant supply
firms.
28VH Applications — Use of the 38VH002,003
and 004 units with matching 28VH indoor coils, for
high SEER (Seasonal Energy Efficiency Ratio) per­
formance, requires the weight method of charging.
Discharge the factory charge into a proper container
and weigh in the correct charge as shown below. The
charge is critical for proper operation and the weight
method is the recommended charging procedure.
Charging Weights — 28VH Combinations
(Refrigerant R-22)’
SYSTEM COMBINATIONS LBS LBS-OZ
38VH002/28VH002 9 1 9-2
38VH003/28VH004 9 1 9-2
38VH004/28VH004 9 3 9-5
‘These charges are for 25-ft of tubing See Refrigerant Charging,
page 6, for charge variation of other than 25 feet
Table 7 — Refrigerant Charging Methods
CONO UNIT
METHODS OF CHECKING OR
ADJUSTING CHARGE
METHODS FOR COMPLETE
RECHARGING
38VHt System Refrigerant Control System Refrigerant Control
Non TXV TXV Non TXV TXV
001,002
003.004
045.005 Chargemaster
or
Charging Chart
Sight
Glass*
Weight Method
plus
Chargemaster or
Charging Chart
Weight Method
plus
Sight Glass‘
‘Sight glass field supplied and installed in liquid refrigerant line
fNot to be used for 28VH applications See "Weight Method — 28VFI Applications "
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