5
Step 2 — Rig and Mount Unit
RIGGING — Units are designed for overhead rigging only.
For this purpose, the transverse base rails extend beyond sides
of unit, with holes provided in end plates to attach clevis for
securing cables. Rig with top skid packaging assembly in place
to prevent unit damage by rigging cable. For coil face protec-
tion, place plywood sheets against the sides of unit, behind
cables. Run cables to a central suspension point so that the
angle from the horizontal is not less than 45 degrees. Raise and
set unit down carefully.
If it is necessary to roll unit into position, mount unit on
field-supplied longitudinal rails using a minimum of 3 rollers.
APPLY FORCE TO THE RAILS, NOT THE UNIT. If unit is
to be skidded into position, place it on a large pad and drag the
pad. DO NOT APPLY ANY FORCE TO THE UNIT.
Raise from above to lift unit from rails or pad when placing
unit in final position.
LOCATE UNIT — For service access and unrestricted airflow,
provide 2 ft (610 mm) clearance on each end of unit and 3 ft
(914 mm) clearance on each side of unit. Position unit so that
there is unrestricted airflow above unit.
NOTE: Before mounting unit, remove 4 holddown brackets
and release skid.
If conditions or local codes require unit to be fastened to
pad, use the mounting holes in the 4 unit mounting feet
(see Fig. 1).
MOUNT UNIT — The unit may be mounted on a solid, level
concrete pad, on accessory mounting legs, or on field-supplied
raised supports at each mounting position. (Note that mounting
hardware is field supplied.)
Weight distribution (shown in Fig. 3 and Table 2) deter-
mines the type of support required. Bolt unit securely to pad or
supports after unit is in position and is level. Be sure to mount
unit level to ensure proper oil return to compressors. Mounting
holes on unit can be used to secure unit to vibration isolators, if
required.
COMPRESSOR MOUNTING — As shipped, compressor is
held down by 4 bolts. After unit is installed, loosen each bolt
using locknut indicated in Fig. 4 until flat washer (
3
/
8
in.) can
be moved with finger pressure.
Step 3 — Complete Refrigerant Piping Con-
nections —
Refrigerant lines must be carefully designed
and constructed to ensure equipment reliability and efficiency.
Line length, pressure drop, compressor oil return, and vertical
separation are several of the design criteria that must be evalu-
ated. See the following sections.
CHECK VERTICAL SEPARATION — If there is any vertical
separation between the indoor and outdoor units, check Table 3
to ensure that the separation is within allowable limits. Relo-
cate equipment if necessary.
Table 3 — Maximum Vertical Separation*
*Vertical distance between indoor and outdoor units.
Be sure unit panels are securely in place prior to rigging.
Be careful rigging, handling, and installing unit. Improper
unit location can cause system malfunction and material
damage. Inspect base rails for any shipping damage and
make sure they are fastened securely to unit before rigging.
IMPORTANT: Piping must be properly sized and
installed for the system to operate efficiently.
OUTDOOR UNIT 38AQS INDOOR UNIT 40RMQ
DISTANCE — FT (M)
Indoor Unit
Above Outdoor Unit Below Outdoor Unit
012 012
50 (15.2) 50 (15.2)
016 016
80 (24.4) 80 (24.4)
Fig. 4 — Compressor Mounting
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