33
INSTALLATION
Step 1 — Place Units in Position
42C UNITS
1. Select the unit location. Allow adequate space for free air
circulation, service clearances, piping and electrical
connections, and any necessary ductwork. For specific
unit dimensions, refer to Fig. 1-12. Allow clearances ac-
cording to local and national electric codes.
2. Make sure the ceiling is able to support the weight of the
unit. See Table 1 for nominal unit weight.
3. Ensure bottom panel has been removed from 42CG, CK
units with mounting holes. When unit is lifted, access to
the 0.375-in. mounting holes is through the bottom of the
unit. Hanger rods and fasteners and other required hard-
ware must be field-supplied. See Table 4 for threaded rod
recommendations.
4. Move unit into position. Ensure unit is level or pitched
towards drain to ensure proper drainage and operation.
Pitch of suspended unit can change after coil is filled;
recheck after filling coil.
5. Mounting unit:
a. Use rods and fasteners to suspend the unit at the
factory-provided mounting holes with rubber
grommets on the top of the unit on 42CG, CK
units. Reach into unit and attach unit to the ceiling
using the 0.375-in. mounting holes (4) in top
panel; do not use any other locations.
b. Use rods and fasteners to suspend the unit at the
factory-provided 0.375-in. hanger slots (4) with
rubber grommets on the top of the unit on the
42CA and CE units.
NOTE: The four mounting holes and hanger slots
with rubber grommets are NOT for balancing unit.
6. The 42CA units without plenums and 42CE with bottom
inlet may be installed in noncombustible areas only.
NOTE: The installation of horizontal concealed units must
meet the requirements of the National Fire Protection Associa-
tion (NFPA) Standard 90A or 90B concerning the use of con-
cealed ceiling space as return-air plenums.
Table 4 — Threaded Rod Sizing Recommendation
42V UNITS — While the manufacturer is not involved in the
design and selection of support methods and components, it
shall be noted that unacceptable system operating characteris-
tics and/or performance may result from improper or inade-
quate unit structural support.
1. Select the unit location. Allow adequate space for free air
circulation, service clearances, piping and electrical
connections, and any necessary ductwork. For specific
unit dimensions, refer to Fig. 13-23. Allow clearances
according to local and national electric codes. See Fig. 29
for minimum clearance recommendations.
2. Ensure the floor is able to support the weight of the unit.
See Table 2 for nominal unit weight. Vertical units are de-
signed to be floor mounted or otherwise supported from
below, and bolted to the wall or floor structure through
the mounting holes provided in the chassis. These units
may be wall hung only when originally ordered from the
factory for wall mount applications.
3. Ensure wall behind unit is smooth and plumb; if
necessary, install furring strips on walls with irregular
surfaces or mullions. Furring strips must be positioned
behind mounting holes in unit (42VA, VB, VF units).
Fasteners, furring strips, and other seals (if required) must
be field-supplied.
4. Remove all wall and floor moldings from behind the unit.
5. Ensure 42VA top panel (under window application) and
42VB, VF front panel has been removed from unit to
obtain access to the four 0.75-in. mounting holes. Hanger
rods and fasteners and other required hardware must be
field-supplied.
6. Move unit into position. Ensure unit is level or pitched
towards drain to ensure proper drainage and operation.
Pitch of suspended unit can change after coil is filled;
recheck after filling coil.
7. Adjust 42VA, VB, VC, VE, VF units leveling legs so unit
is level. Unit must be level for proper operation and
condensate drainage.
8. Mounting unit:
The type of mounting device is a matter of choice, how-
ever, the mounting point shall always be that provided in
the chassis or cabinet.
a. Use rods and fasteners to suspend the unit at the
factory-provided mounting holes with rubber
grommets on the top of the unit on 42VA, VB, VF
units. Reach into unit and attach unit to the wall
using the 0.375-in. mounting holes (4) in top
panel; do not use any other locations. The four
mounting holes and hanger slots with rubber
grommets are NOT for balancing unit.
b. On 42VG unit ensure unit is placed snug within
the wall.
c. On 42VC, VE unit ensure unit is placed flush
against the wall.
NOTE: For any unit without a return-air duct connection,
applicable installation codes may limit unit to installation in
single-story residence only.
MODEL
ROD
DIAMETER
(in.)
ROD
QTY
42C*02-12
3
/
8
4
42D*06-20
