Carrier 38AK024-044 - Oil Charge; Liquid Shutoff;Charging Valve; Capacity Control

Fan
Adjustment
(See
Fig.
16)
TOP OF FAN ORIFICE FILL HOLE IN FAN HUB
WITH PERMAGUM
FAN BLADE
HUB
ORIFICE
PROP LOCATION
60 Hz
38AK024
38AK028-034
38AK044
3.12 (79.2
3.62 (91.9)
3.88 (98.6)
50 Hz
38AK024
3.62
(91.9)
3.88
(98.6)
38AK028,034,044 3.12 (79.2) 338 (85.9)
Fig. 16 — Location of Prop on Motor Shaft
from Outside of Orifice Ring
Oil Charge — Compressors are factory charged with oil
as follows:
AMOUNT
COMPRESSOR
pints
(liters)
06E4250 14 (6.6)
06E9265 19 (9.0)
06E9275 19 (9.0)
06E9299 19 (9.0)
When additional oil or a complete charge is required, use
only Carrier-approved compressor oil:
Witco Chemical Corp. .................. Suniso 3GS
Texaco IB. 3354.44 quee EA EAS Cass Capella WF-32
Shrieve Chemical Co. ........... Zerol 150 (Synthetic)
IMPORTANT: Do not use drained oil or use oil that
has been exposed to atmosphere. Refer to Carrier
Standard Service Techniques Manual, Chapter 1,
Refrigerants, for procedures to add or remove oil.
18
Liquid Shutoff/ Charging Valve is located inside the
compressor compartment and is provided with 1/4-in. flare
connection for field charging.
Capacity Control is by either one or 2 suction pressure
actuated unloaders. Each controls 2 cylinders. Unloaders
are factory set (see Table 1) but may be field adjusted.
Number I unloader is on cylinder bank on same side of
compressor as terminal box.
CONTROL SET POINT — The control set point (cylinder
load point) is adjustable from 0 to 85 psig. To adjust, turn
control set point adjustment nut (Fig. 17) clockwise to its
bottom stop. In this position, set point is 85 psig. Then, turn
adjustment counterclockwise to desired control set point.
Every full turn counterclockwise decreases set point by 7.5
psig.
CONTROL
SET POINT
ADJUSTMENT
NUT
A POWER HEAD
PRESSURE
DIFFERENTIAL
ADJUSTMENT
SCREW
[-*— VALVE BODY
BYPASS
PISTON RING
BYPASS PISTON
NG CAP
(CAP MUST BE REPLACED
TO PREVENT REFRIGERANT LEAKAGE)
Fig. 17 — Capacity Control Valve
PRESSURE DIFFERENTIAL — The pressure differential
(difference between cylinder load and unload points) is
adjustable from 6 to 22 psig. To adjust, turn pressure
differential adjustment screw (Fig. 17) counterclockwise to
its backstop position. In this position, differential is 6 psig.
Then, turn adjustment clockwise to desired pressure differ-
ential. Every full turn clockwise increases differential by 1.5
psig.