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Installation
•
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.
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.
Horizontal Discharge
Conversion (6 to 12.5 Ton Units)
Notes:
•
15 to 25 ton units require purchase of an
accessory kit for conversion.
•
6 to 12.5 ton units move the supply cover to
return opening and return cover to supply
opening.
Supplies Needed by Installer for Conversion: 3 ounce tube
of high temperature RTV sealant (500°F / 260°C, similar to
Dow Corning 736).
Note: Failure to use recommended sealant could result in
unit performance loss.
If a unit is to be converted to a horizontal discharge, the
following conversion must be performed:
1. Remove RETURN and SUPPLY duct covers.
2. Place SUPPLY DUCT COVER over down-flow return
opening. (insulation side down)
3. Using self-drilling screws, (or screws removed from
duct cover), screw through dimples to attach DUCT
COVER to base.
32
Figure 39. Supply duct cover
4. On original RETURN DUCT COVER, apply ¼"(6 mm.)
continuous bead of 500°F RTV sealant around flange
(opposite insulation side), as shown.
Figure 40. Return duct cover
RTV Sealant
5. Slide RETURN DUCT COVER (insulation side up) into
supply opening until inward edge of duct cover
engages with the 2 retaining clips on the duct flange.
Secure outward edge of the duct cover with two
screws.
Notes:
•
If unit is equipped with Return Air Smoke
Detector, refer to field conversion instructions
for horizontal discharge before installing
return air duct.
•
If unit is equipped with Discharge Air Sensing
option refer to the following figure for proper
tube positioning based on unit supply duct
orientation / tonnage or refer to literature
ACC-SVN240*-EN for more details.
Figure 41. Supply and return opening
Insulation side up
Supply duct cover
Insulation side
down
Return duct
cover
RT-SVX070B-EN
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