York PCG6B42 Installation Manual page 6

5285473-UIM-E-1217
DUCTWORK
NOTICE
All units are shipped in the horizontal supply/return configuration. It is
important to reduce the possibility of any air leakage through the bot-
tom duct covers (resulting from cut, torn, or rolled gasket) due to
improper handling or shipping processes. To ensure a good tight
seal, it is recommended that silicone caulk and/or foil tape be applied
along the cover edges.
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.
2. Install the duct covers (removed in step one) to the rear supply and
return air duct openings.
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 must be used. This does not preclude use
of economizers or ventilation air intake. Flexible joints are recom-
mended to be used in the supply and return duct work to minimize the
transmission of vibration and noise.
NOTICE
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.
FILTERS
Proper filter size is very important. Filter size, type and pressure drop
should always be considered during duct system design.
All 3 phase units include a filter frame kit which is shipped inside the
unit from production. Field installation is required.
Filters must always be used and must be kept clean. When filters
become dirt laden:
• insufficient air is delivered by the blower
• the unit efficiency is decreased
• operating costs are increased
• wear-and-tear is increased on the unit and controls.
Filters should be checked monthly. This is especially important since
this unit is used for both heating and cooling.
CONDENSATE DRAIN
A condensate trap must be installed in the condensate drain. The
plumbing must conform to local codes.
Use Teflon tape or pipe thread compound if needed.
CAUTION
!
Hand tighten only.
6
Model A B
All 14 13.5
FIGURE 4: Bottom Duct Dimensions (inches)
Model
All
FIGURE 5: Rear Duct Dimensions (inches)
C D E
5 3.5 47.5
A B
13.6 14
Johnson Controls Unitary Products
F
42