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Figure 6: Roof Curb1
Ductwork
These units are adaptable to downflow use as well as rear supply and return air duct openings. To convert to downflow, use the following steps:
1.Remove the duct covers found in the bottom return and supply air duct openings. There are four (4) screws securing each duct cover (save these screws to use in Step 2).
2.Install the duct covers (removed in step one) to the rear supply and return air duct openings. Secure with the four
(4) screws used in step one.
3.Seal duct covers with silicone caulk.
Duct work should be designed and sized according to the methods of the Air Conditioning Contractors of America (ACCA), as set forth in their Manual D.
A closed return duct system shall be used. This shall not preclude use of economizers or ventilation air intake. Flexible joints may be used in the supply and return duct work to minimize the transmission of noise.
When fastening duct work to the side duct flanges on the unit, insert the screws through the duct flanges only. DO NOT insert the screws through the casing. Outdoor duct work must be insulated and waterproofed.
NOTE: Be sure to note supply and return openings.
Refer to Figures 4 and 5 for information concerning rear and bottom supply and return air duct openings.
Roof Curb
On applications when a roof curb is used, the unit must be positioned on the curb so the front of the unit is tight against the curb.
Filters
Single phase units are shipped without a filter or filter racks. It is the responsibility of the installer to secure a filter in the return air ductwork or install a Filter/Frame Kit (1FF0114).
A filter rack and high velocity filters are standard on three phase units.
Filters must always be used and must be kept clean. When filters become dirt laden, insufficient air will be delivered by the blower, decreasing your units efficiency and increasing operating costs and
Filters should be checked monthly; this is especially important since this unit is used for both heating and cooling.
Condensate Drain
A condensate trap is recommended to be installed in the condensate drain. The plumbing must conform to local codes.
Use a sealing compound on male pipe threads. Install the condensate drain line (3/4” NPTF) to spill into an open drain.
1. 8” Roof Curb also available.
Unitary Products Group | 7 |
