3
or piping during handling. Never use the risers to lift the unit. Al
-
so, depending on the options and accessories, some units could
contain delicate components that may be damaged by improper
handling. Lifting or supporting the cabinet only at the top and bot
-
tom should be avoided to maintain the straight and square cabinet
alignment. The unit must be lowered into the space taking care to
properly align the risers to engage the riser swaged sections on the
unit below. The risers should never be bent or pushed together to
be passed through the floor slot and should never be lifted up or
pulled down to meet the risers on the floor below or above. The
risers are designed with a 3 in. swage to accommodate a 2 in.
overlap and minor floor to floor variations.
The equipment covered in this manual IS NOT suitable for out
-
door installations. The equipment should never be stored or in
-
stalled where it may be subjected to a hostile environment such as
rain, snow, or extreme temperatures.
During and after installation, special care must be taken to prevent
foreign material such as paint, plaster, and drywall dust from being
deposited in the drain pan or on the motor or blower wheels. Fail
-
ure to do so may have serious adverse effects on unit operation,
and in the case of the motor and blower assembly, may result in
immediate or premature failure. All manufacturer’s warranties are
void if foreign material is allowed to be deposited on the motor or
blower wheels of any unit. Some units and/or job conditions may
require some form of temporary covering during construction.
While the manufacturer does not become involved in the design
and selection of support methods and components, it should be
noted that unacceptable system operating characteristics and/or
performance may result from improper or inadequate unit struc
-
tural support. Due to variations in building construction, floor
plans, and unit configurations, each installation is different. The
actual step-by-step method of installation may vary from unit to
unit. However, the risers should be moved as little as possible to
avoid damage to the unit and internal components.
On certain units, shipping screws or braces must be removed after
the unit is installed. Be sure to check all tags on the unit to deter
-
mine which, if any, of these devices need to be removed.
Prepare Jobsite for Unit Installation
To save time and to reduce the possibility of costly errors, set up a
complete sample installation in a typical room at jobsite. Check all
critical dimensions such as pipe, wire, and duct connection re
-
quirements. Refer to job drawings and product dimension draw
-
ings as required (see Fig. 3-14). Instruct all trades in their part of
the installation.
Identify and Prepare Units
Be sure power requirements match available power source. Refer
to unit nameplate and wiring diagram.
1. Check all tags on unit to determine if shipping screws or
braces are to be removed. Remove screws as directed.
2. Rotate the fan wheel by hand to ensure that the fan is unre
-
stricted and can rotate freely. Check for shipping damage and
fan obstructions. Adjust blower motor as required.
NOTE: When optional factory-installed risers are ordered, see Ap
-
pendix A on page 32 for block-out construction dimensions.
Unit Clearance and Service Access
For specific unit dimensions, refer to the product data catalog and
submittal drawings for your model. Provide adequate clearance
for the removal of the panel, access to controls or replacement of
internal serviceable components including air filters. Allow clear
-
ances according to local and national codes.
Service access is available from the front on vertical stack units by
removing the return air panel. Refer to Fig. 2 for service access
and clearance.
Fig. 2 — Unit Clearance and Service Access
Figure X. M*Y
Figure X. M*Y
28 in. (711 mm)
28 in. (711 mm)
42SG/SJ/SH Units
42SMA Unit
