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FIGURE 23
REFRIGERANT STAGES -
All-Aluminum Coil
(BOTH FANS ARE ENERGIZED
WITH A Y1 DEMAND)
1
2
EVAPORATOR
COIL STAGE 2
CONDENSER
COIL STAGE 2
CONDENSER
FAN 1
CONDENSER
2
CONDENSER
COIL STAGE 1
EVAPORATOR
COIL STAGE 1
1
2
(ALL FANS ARE ENERGIZED IN LOW SPEED WITH A Y1
DEMAND AND HIGH SPEED WITH A Y2 DEMAND)
EVAPORATOR
COIL
CONDENSER
COIL
CONDENSER
FAN 2
CONDENSER
FAN 3
B21
REFRIGERANT STAGES - 094U, 122U, 152U
TRADITIONAL FIN/TUBE COIL
B4
CONDENSER
FAN 1
B5
FIGURE 24
V- SYSTEMS SERVICE CHECKS
A-Electrical
1 Check all wiring for loose connections.
2 Check for correct voltage at unit (unit operating).
3 Check amp-draw on both condenser fan motor and
blower motor.
Fan Motor Rating Plate ____ Actual ________
Indoor Blower Motor Rating Plate____ Actual____
VI-ACCESSORIES
The accessories section describes the application of most of
the optional accessories which can be factory or field installed
to the LCH units.
A-Mounting Frames
When installing units on a combustible surface for downflow
discharge applications, the C1CURB roof mounting frame is
used. The roof mounting frames are recommended in all
other applications but not required. If the LCH units are not
mounted on a flat (roof) surface, they MUST be supported
under all edges and under the middle of the unit to prevent
sagging. The units MUST be mounted level within 1/16" per
linear foot or 5mm per meter in any direction.
The assembled C1CURB mounting frame is shown in fig
ure 25. Refer to the roof mounting frame installation instruc
tions for details of proper assembly and mounting. The roof
mounting frame MUST be squared to the roof and level be
fore mounting. Plenum system MUST be installed before
the unit is set on the mounting frame. Typical roof curbing
and flashing is shown in figure 26. Refer to the roof mount
ing frame installation instructions for proper plenum con
struction and attachment.
B-Transitions
Optional supply/return transitions C1DIFF30B is available
for use with the LCH 7.5 ton units and C1DIFF31B is avail
able for the 8.5 and 10 ton units, utilizing optional C1CURB
roof mounting frames. LCH 12.5 ton units will use
C1DIFF32B with C1CURB roof mounting frame. Transition
must be installed in the C1CURB mounting frame before
mounting the unit to the frame. Refer to the manufacturer's
instructions included with the transition for detailed installa
tion procedures.
C-C1DAMP Outdoor Air Dampers (all units)
C1DAMP consists of a set of dampers which may be manu
ally C1DAMP10B-2 or motor C1DAMP20B-1 operated to
allow up to 25 percent outside air into the system at all times
(see figure 27 or 28). Either air damper can be installed in
LCH units. Washable filter supplied with the outdoor air
dampers can be cleaned with water and a mild detergent.
It should be sprayed with Filter Handicoater when dry prior
to reinstallation. Filter Handicoater is R.P. Products coating
no. 418 and is available as Part No. P-8-5069.
D-Supply and Return Diffusers (all units)
Optional flush mount diffuser/return FD11 and extended mount
diffuser/return RTD11 are available for use with all LCH units.
Refer to manufacturer's instructions included with transi
tion for detailed installation procedures.
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