Installation
RT-SVX38C-EN
19
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 12, p. 17
. Refer to the typical
unit operating weights table before proceeding.
1.
Remove all drill screws fastening wood protection to
metal base rail. Remove all screws securing wooden
protection to wooden top crate.
On 7½ to 10 ton high efficiency units, remove wire ties
from outdoor grill.
2. Remove wooden top crate.
3. Rig the unit as shown in
Figure 12, p. 17
.
Attach
adequate strength lifting slings to all four lifting
brackets in the unit base rail. Do not use cables, chains,
or slings except as shown.
4. Install a lifting bar, as shown in
Figure 12, p. 17
, to
protect the unit 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 base fork
pocket protection components as shown in the
following figures.
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 following checklist is a summary of the steps required
to successfully install a commercial unit. This checklist is
intended to acquaint installing personnel with what is
required in the installation process. It does not replace
detailed instructions in this manual.
•
Check the unit for shipping damage and material
shortage; file a freight claim and notify appropriate
sales representative.
•
Verify correct model, options and voltage from unit
nameplate.
•
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.
Note:
Condensate Overflow Switch (if equipped) will not
work if unit is not level properly.
Factory-Installed Economizer
•
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.
Temperature Limit Switch Usage for Gas
Heat Units
Units are factory shipped in the down flow 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 limit switch change
out for horizontal discharge. The additional limit
switch is shipped attached to the combustion
blower housing: YSC060ED*H, YSC072ED*H,
YSC090ED*H, YSC102ED*H, YSC120ED*H.
WARNING
Heavy Objects!
Ensure that all the lifting equipment used is properly
rated for the weight of the unit being lifted. Each of the
cables (chains or slings), hooks, and shackles 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 could cause
equipment or property damage. Failure to follow
instructions above or properly lift unit could result in
unit dropping and possibly crushing operator/
technician which could result in death or serious injury.
Figure 17.
Fork pockets
Remove 2
forklift
brackets
Remove 2 metal runners
and 3 wooden boards
Summary of Contents for RT-SVX38C-EN
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