Placing Unit — There must be 4 ft (1220 mm) for ser-
vice on all sides of unit, and a minimum of 8 ft (2440 mm)
clear air space above unit. For multiple units, allow 8 ft
(2440 mm) separation between units for airflow and service.
Mounting Unit — When unit is in proper location, use
of mounting holes in base rails is recommended for securing
unit to supporting structure or for mounting unit on vibra-
tion isolators, if required. Fasteners for mounting unit are
field supplied. Be sure to mount unit level to ensure proper
oil return to compressors.
Compressor Mounting — As shipped, compressor
is held down by 4 bolts. After unit is installed loosen each
bolt using nut indicated in Fig. 3 until flatwasher (
3
⁄
8
in.
[9.5 mm]) can be moved with finger pressure.
INSTALLATION
Refrigerant Piping Connections —
Line sizes de-
pend on length of piping required between condensing unit
and evaporator. See Table 2A or 2B. It is important to con-
sider liquid lift and compressor oil return. Refer to Part 3 of
Carrier System Design Manual for line sizing information,
and Fig. 4 for recommended piping details.
Liquid Line Solenoid Drop Control — The factory-
supplied solenoid valve must be installed at the indoor unit
(fan coil) per Fig. 5, and wired per wiring label found on
unit. The solenoid assures that system refrigerant is in the
high-pressure side (condenser and liquid line) of the system
during the off cycle. Refrigerant migration is minimized.
Factory-supplied liquid line solenoid valve connecting sizes
are
7
⁄
8
-in. (22.2 mm) ODF for inlet and
7
⁄
8
-in. (22.2 mm)
ODM for outlet.
Failure to properly install liquid line solenoid at the in-
door unit as described, without Carrier authorization, may
VOID warranty.
Filter Drier and Moisture Indicator — Every unit
should have a filter drier and a sight glass (moisture indi-
cator) field installed. Select the filter drier for maximum unit
capacity and minimum pressure drop. Figure 5 shows rec-
ommended locations of filter drier(s) and sight glass. Com-
plete the refrigerant piping from the evaporator to the con-
denser before opening the liquid and suction lines at the
condensing unit. One filter drier may be installed at location
A in Fig. 5, or 2 filter driers may be installed at locations B.
Fig. 1 — 38AKS Units
NOTES:
1. Use 2 in. OD (50 mm) pipe or hooks in lifting holes.
2. Rig with 4 cables and spread with 2 ‘‘D’’ long and two ‘‘A’’ long
2 x 4’s in. (50 x 100 mm) or equal.
3. Run the rigging cables to a central suspension point so that the
angle from the horizontal is not less than 45 degrees.
All panels must be in place when rigging.
UNIT
38AKS
MAX SHIP.
WT
LIFTING
HOLES
‘‘A’’
CENTER OF GRAVITY
‘‘D’’
‘‘B’’ ‘‘C’’
Lb Kg in. mm in. mm in. mm in. mm
028 1924 872 81 2057 43.0 1092 28.0 711 73.5 1867
034 2115 960 81 2057 43.0 1092 28.0 711 73.5 1867
044 2797 1207 99 2515 49.0 1245 30.5 775 73.5 1867
Fig. 2 — Rigging with Spreader Bars
(Field Supplied)
3
