General Unit Requirements - American Standard YSC036A Installation, Operation And Maintenance Manual

joining the roof curb are included in
the curb instruction booklet. Curb
ductwork must be fabricated and
installed by the installing contractor
before the unit is set into place.
Note: For sound consideration, cut
only the holes in the roof
deck for the ductwork
penetrations. Do not cut out
the entire roof deck within the
curb perimeter.
If a Curb Accessory Kit is not
used:
• The ductwork can be attached
directly to the factory-provided
flanges around the unit's supply
and return air openings. Be sure
to use flexible duct connections
at the unit.
• For "built-up" curbs supplied by
others, gaskets must be installed
around the curb perimeter flange
and the supply and return air
opening flanges.
Rigging
A Rigging illustration and Center-of-
Gravity dimensional data table is
shown in Figure 7, p. 17. Refer to the
typical unit operating weights table
before proceeding.
1. Remove all drill screws fastening
wood protection to metal
baserail. Remove all screws
securing wooden protection to
wooden top crate.
2. Remove Wooden Top Crate.
WARNING
Heavy Objects!
Do not use cables (chains or slings)
except as shown. Each of the cables
(chains or slings) used to lift the unit
must be capable of supporting the
entire weight of the unit. Lifting
cables (chains or slings) may not be
of the same length. Adjust as
necessary for even unit lift. Other
lifting arrangements may cause
equipment or property-only damage.
Failure to properly lift unit could
result in death or serious injury. See
details below.
3. Rig the unit as shown in
p. 17. Attach adequate strength
lifting slings to all four lifting
brackets in the unit base rail. Do
20
not use cables, chains, or slings
except as shown.
4. Install a lifting bar, as shown in
Figure 7, p.
and to facilitate a uniform lift.
The minimum distance between
the lifting hook and the top of the
unit should be 7 feet.
5. Test-lift the unit to ensure it is
properly rigged and balanced,
make any necessary rigging
adjustments.
6. Lift the unit enough to allow the
removal of two Fork Lift brackets
and hardware. Remove the two
Fork Lift brackets, two metal
runners and three wooden
boards as shown in the following
Figure.
Figure 12. Fork pocket
7. Downflow units; align the base
rail of the unit with the curb rail
while lowering the unit onto the
curb. Make sure that the gasket
on the curb is not damaged
while positioning the unit.
General Unit
Requirements
The checklist listed below is a
summary of the steps required to
successfully install a commercial
unit. This checklist is intended to
acquaint the installing personnel
with what is required in the
installation process. It does not
replace the detailed instructions
called out in the applicable sections
of this manual.
• Check the unit for shipping
damage and material shortage;
file a freight claim and notify
appropriate sales representative.
Figure 7,
• Verify correct model, options and
voltage from unit nameplate.
•
17, to protect the unit
•
•
•
•
•
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Factory Installed Economizer
•
•
Temperature Limit Switch
Usage for Gas Heat Units
Units are factory shipped in the
downflow discharge configuration
but can be field converted to a
horizontal discharge configuration.
Some, but not all units require a
different TCO1 limit switch, which is
attached to the combustion blower
motor if horizontal discharge
configuration is used.
Note: The following units require a
Installation
Verify that the installation
location of the unit will provide
the required clearance for proper
operation.
Assemble and install the roof
curb (if applicable). Refer to the
latest edition of the curb
installers guide that ships with
each curb kit.
Fabricate and install ductwork;
secure ductwork to curb.
Install pitch pocket for power
supply through building roof. (If
applicable)
Rigging the unit.
Set the unit onto the curb; check
for levelness.
Ensure unit-to-curb seal is tight
and without buckles or cracks.
Install and connect a condensate
drain line to the evaporator drain
connection.
Ensure the economizer has been
pulled out into the operating
position. Refer to the economizer
installers guide for proper
position and setup.
Install all access panels.
limit switch change out for
horizontal discharge. The
additional limit switch is
shipped attached to the
combustion blower housing.
Proceed to the Horizontal
Discharge Conversion, Step 5
on page 24 for the following
models "ONLY".
Y*C072A**(H,Z),
YSC090A**(H,Z),
YSC092A**(H,Z),
YHC092A**(M,Y),
YHC092A**(H,Z),
Y*C102A**(H,Z),
RT-SVX21F-EN