16
Step 2 — Rig and Place Unit —
Units are mounted
on skids. Leave the unit on the skid until it is in the final posi-
tion. While on the skid, the unit can be rolled, dragged or fork-
lifted;
do not apply force to the unit.
Use a minimum of 3 roll-
ers when rolling, and raise from above to remove the skid when
unit is in the final position. See Fig. 14 for rigging details.
PLACING THE UNIT — The selected unit location should
not be adjacent to an acoustically sensitive space. The best lo-
cations for these units are mechanical rooms, near elevator
shafts, near restrooms, near stairwells or other similar loca-
tions. Position the unit where water supply is available for the
unit cooling. Be sure to leave enough space for the return air in-
let access to the evaporator and condenser coils for cleaning
and maintenance. Units located on the same floor should have
a minimum of 6 ft of clearance. Units located floor-to-floor
should have a minimum of 10 ft between units to prevent recir-
culation of conditioned air. DO NOT locate units where they
will recirculate conditioned air. This will cause increased head
pressure which can cause units to trip on high pressure. See
Fig. 15 for recommended unit clearances and locations.
Either provide inlet filters to protect the coils, or locate the
unit in an area free from airborne dirt or other foreign material
which could clog the coils.
The units are designed to pass through most 36-in. door
openings. The filter rack and duct mounting flanges may also
be removed for additional clearance.
Step 3 — Install Evaporator (Supply)
Ductwork —
The units should use a “pair of pants” config-
uration as shown in Fig. 16. Refer to the Carrier System Design
Manual or ASHRAE standards for the recommended duct con-
nection to unit with 2 or more fans.
A flexible canvas duct connector is recommended on both
supply and return air sides of the units to be connected to the
system ductwork.
All metal ductwork should be adequately insulated to avoid
heat loss or gain and to prevent condensation from forming on
the duct walls. Uninsulated ductwork is not recommended, as
the unit's performance will be adversely affected.
Do not connect discharge ducts directly to the blower(s).
The factory filter should be left in place on a free return system.
If the unit will be installed in a new installation, the duct
system should be designed in accordance with the System De-
sign Manual, Part 2 and with ASHRAE procedures for duct
sizing. If the unit will be connected to an existing duct system,
check that the existing duct system has the capacity to handle
the required airflow for the unit application at an acceptable
system static pressure. If the existing duct system is too small,
larger ductwork must be installed.
Units with two fans or more should have a properly de-
signed “pair of pants” duct connection. (See Fig. 16.) Settling
media may be required for uniform flow.
NOTE: Units with two or more fans should not be ducted
separately.
An adequate straight length of ducting from the unit should
be allowed before elbows are installed. See table below for rec-
ommended straight length.
Elbows should turn in the direction of fan rotation, if
possible. Abrupt turns will generate air turbulence, and
excessive noise. Turning vanes should be used in all short
radius bends. Ensure that ducting does not obstruct access to
the unit for routine servicing.
Step 4 — Install Return-Air Ductwork —
Unit is
designed for free return through the unit-mounted filters. When
installing ductwork and filter rack, use accepted ductwork in-
stallation procedures and do not hang the ductwork from the
unit. Follow all applicable codes.
Step 5 — Check Return-Air Filters —
Be sure fil-
ters shipped with unit are the correct size (see Table 1). Never
operate unit without return-air filters in place.
Step 6 — Make Condenser Connections —
Condensers have water inlet and outlet connections as shown
in Fig. 1-13.
Connect condenser water supply and return lines as indicat-
ed in Fig. 1-13. When connecting water lines, hold the con-
denser inlet and outlet stubs firmly with a wrench at the male
pipe thread (MPT) hex fitting to prevent twisting. Do not use
water lines smaller than connection sizes shown in Table 1.
Observe all applicable plumbing and sanitary codes.
Step 7 — Install Condensate Drain Line —
Install a trapped condensate drain line at unit drain connection
(Fig. 1-13). The drains require standard pipe connected to con-
densate pan threaded connection. Figure 17 shows proper trap
design.
SPREADER BAR
SUPPORTS
UNDER PALLET
Fig. 14 — 50XCW Unit Rigging
a50-6556ef
24 (TYP)
36
36
Fig. 15 — Unit Clearances
NOTE: Dimensions are in inches.
a50-8660
50XCW UNIT
LENGTH (in.)
50XCW UNIT
LENGTH (in.)
06
36.5
14
36.7
08
36.5
16
36.7
12
36.7
24
40.0
718
