17
Step 2 — Rig and Place Unit
Units are mounted on skids. Leave the unit on the skid until it is
in the final position. While on the skid, the unit can be rolled,
dragged or forklifted;
do not apply force to the unit.
Use a mini-
mum of 3 rollers when rolling, and raise from above to remove
the skid when unit is in the final position. See Fig. 14 for rigging
details.
Fig. 14 — 50XCW Unit Rigging
PLACING THE UNIT
The selected unit location should not be adjacent to an acoustically
sensitive space. The best locations for these units are mechanical
rooms, near elevator shafts, near restrooms, near stairwells or oth-
er similar locations. Position the unit where water supply is avail-
able for the unit cooling. Be sure to leave enough space for the re-
turn air inlet 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 recircu-
lation of conditioned air. DO NOT locate units where they will re-
circulate conditioned air. This will cause increased head pressure
which can cause units to trip on high pressure. See Fig. 15 for rec-
ommended 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.
Fig. 15 — Unit Clearances
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” configuration as shown in
Fig. 16. Refer to the Carrier System Design Manual or ASHRAE
standards for the recommended duct connection 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 fac-
tory 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 Design Manu-
al, Part 2 and with ASHRAE procedures for duct sizing. If the unit
will be connected to an existing duct system, check that the exist-
ing 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 in-
stalled.
Units with two fans or more should have a properly designed “pair
of pants” duct connection. (See Fig. 16.) Settling media may be re-
quired for uniform flow.
NOTE: Units with two or more fans should not be ducted sepa-
rately.
An adequate straight length of ducting from the unit should be al-
lowed before elbows are installed. See table below for recom-
mended 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
installation procedures and do not hang the ductwork from the
unit. Follow all applicable codes.
Step 5 — Check Return-Air Filters
Be sure filters 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 indicated in
Fig. 1-13. When connecting water lines, hold the condenser 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 appli-
cable 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 conden-
sate pan threaded connection. Figure 17 shows proper trap design.
SPREADER BAR
SUPPORTS
UNDER PALLET
NOTE: Dimensions are in inches.
24 (TYP)
36
36
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