9
Fig. 6 —
50XCR Unit Rigging
Fig. 7 —
Unit Clearances
Step 3 —
Install Supply Ductwork
All units with multiple supply fans (size 08-024) require use of a
“pair of pants” configuration as shown in Fig. 8. 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
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 Design
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 designed “pair
of pants” duct connection. (See Fig. 8.) Settling media may be
required for uniform flow.
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
recommended 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 grille
and 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 2).
Never operate unit without return-air filters in place.
Step 6 —
Make Condenser Connections
Install air-cooled condenser in accordance with the installation in
-
structions provided with condenser. Connection locations for liq
-
uid and refrigerant discharge service lines are shown in Fig. 1-5.
Recommended line sizes are given in Table 3. Refer to Carrier
System Design Manual, Part 3, for standard refrigerant piping
techniques.
Remote condenser units are shipped with a holding charge of ni
-
trogen. After refrigerant connections are made, release nitrogen,
evacuate, leak test, and charge system as described in the Check
-
ing System Charge section on page 23.
Step 7 —
Install Condensate Drain Line
The 50XCR unit has a drain connection for evaporator conden
-
sate. When connecting condensate drains from the unit to floor
drains, sinks, or hoppers, connect drains downstream of trap to en
-
sure that condensate does not drain back into the unit.
Make connections through the unit side panel. Some applications
may require connection to either galvanized steel or copper drain
pipe; consult local code requirements for details. See Fig. 9.
Pitch drain pipe downward at a slope of at least
1
/
4
-in. per ft for
proper drainage. Provide tees plugged on one side for clean outs.
Leave clearance for servicing, and observe all local sanitary codes.
The condensate trap should have a depth adequate to allow 3-in. of
water in the trap (see Fig. 9) with the unit running.
SPREADER BAR
SUPPORTS
UNDER PALLET
NOTE: Dimensions are in inches.
24 (TYP)
36
36
50XCR UNIT
LENGTH (in.)
50XCR UNIT
LENGTH (in.)
06
36.5
14
36.7
08
36.5
16
36.7
12
36.7
24
40.0
IMPORTANT: NEVER use pipe smaller than
3
/
4
inches in the
drain run.
