Carrier WeatherExpert 50LC14, Installation Instructions Manual

Page: 19 / 84

19
Table 2 — Operating Weights
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installation
requirements.
2. Determine unit location (from project plans) or select unit
location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or other)
that provides for the minimum clearances required for safety. This
includes the clearance to combustible surfaces), unit performance
and service access below, around and above unit as specified in
unit drawings. See Fig. 5, 10, and 15.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class A, B,
or C roof-covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air inlets
near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, avoid locations that permit water
from higher level runoff and overhangs to fall onto unit.
Select a unit mounting system that provides adequate height to al -
low installation of condensate trap per requirements. Refer to
Step 11 — Install External Condensate Trap and Line on page 28
for required trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements. Unit
operating weight is shown in Table 2.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different se -
quences for the steps of unit installation. For example, on curb-
mounted units, some accessories must be installed on the unit be -
fore the unit is placed on the curb. Review the following for rec -
ommended sequences for installation steps:
CURB-MOUNTED INSTALLATION
1. Install curb
2. Install field-fabricated ductwork inside curb
3. Install accessory thru-base service connection package
(affects curb and unit)
4. Rig and place unit
5. Remove top skid
6. Install outdoor air hood
7. Install smoke detector tube
8. Install condensate line trap and piping
9. Make electrical connections
10. Install other accessories
PAD-MOUNTED INSTALLATION
1. Prepare pad and unit supports
2. Rig and place unit
3. Remove duct covers and top skid
4. Install return air smoke detector tube
5. Install field-fabricated ductwork at unit duct openings
6. Install outdoor air hood
7. Install condensate line trap and piping
8. Make electrical connections
9. Install other accessories
FRAME-MOUNTED INSTALLATION
Frame-mounted applications generally follow the sequence for a
curb installation. Adapt the sequence as required to suit specific
installation plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with trans -
portation agency.
Confirm before installation of unit that voltage, amperage and cir -
cuit protection requirements listed on unit data plate agree with
power supply provided.
On units with hinged panel option, check to be sure all latches are
snug and in closed position.
Locate the carton containing the outside air hood parts. See
Fig. 17. Do not remove carton until unit has been rigged and locat -
ed in final position.
Fig. 17 — Typical Access Panel and Compressor
Locations
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in Fig. 19-
21. Assemble and install accessory roof curb in accordance with
instructions shipped with the curb.
The gasketing of the unit to the roof curb is critical for a water -
tight seal. Install gasket supplied with the roof curb as shown in
Fig. 19-21. Improperly applied gasket can also result in air leaks
and poor unit performance.
Curb should be level. This is necessary for unit drain to function
properly. Unit leveling tolerances are shown in Fig. 18. Refer to
Accessory Roof Curb Installation Instructions for additional infor -
mation as required.
50LC-*
UNIT LB (KG)
14 17 20 24 26
Base Unit 1754 (797.3) 1996 (907.3) 2102 (955.7) 2248 (1022.0) 2393 (1087.6)
Economizer
246 (112) 246 (112) 246 (112) 246 (112) 246 (112)
Powered Outlet 35 (16) 35 (16) 35 (16) 35 (16) 35 (16)
Curb
14-in. (356 mm)
240 (109) 240 (109) 255 (116) 255 (116) 273 (124)
24-in. (610 mm)
340 (154) 340 (154) 355 (161) 355 (161) 355 (161)
CONTROL BOX
ACCESS PANEL
FILTER AND
INDOOR COIL
ACCESS PANEL
INDOOR BLOWER
ACCESS PANEL
ELECTRIC HEAT
ACCESS PANEL
COMPRESSOR
(EACH SIDE)
HOOD CARTON LOCATIO
(REAR ACCESS PANEL)