Comfort-Aire HEH Series 2 to 5 Tons - Manual (Page 10)

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Installation, Operation & Maintenance HEV/H SERIES Heat Controller, LLC.
VERTICAL IN
Sound Attenuation for Vertical Units
Sound attenuation is achieved by enclosing the unit
within a small mechanical room or a closet. Additional
measures for sound control include the following:
1. Mount the unit so that the return air inlet is 90° to
the return air grille. Refer to Figure 9. Install a sound
baffle as illustrated to reduce line-of sight sound
transmitted through return air grilles.
2. Mount the unit on a rubber or neoprene isolation pad to
minimize vibration transmission to the building structure.
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Figure 9: Vertical Sound Attenuation
VERTICAL INSTALLATION
Condensate Piping for Vertical Units
Install condensate trap at each unit with the top of the trap
positioned below the unit condensate drain connection as
shown in Figure 4. Design the depth of the trap (water-
seal) based upon the amount of External Static Pressure
(ESP) capability of the blower (where 2 inches [51mm] of
ESP capability requires 2 inches [51mm] of trap depth). As a
general rule, 1 1/2 inch [38mm] trap depth is the minimum.
Each unit must be installed with its own individual trap and
connection to the condensate line (main) or riser. Provide
a means to fl ush or blow out the condensate line. DO NOT
install units with a common trap and/or vent.
Always vent the condensate line when dirt or air can collect
in the line or a long horizontal drain line is required. Also vent
when large units are working against higher external static
pressure than other units connected to the same condensate
main since this may cause poor drainage for all units on
the line. WHEN A VENT IS INSTALLED IN THE DRAIN
LINE, IT MUST BE LOCATED AFTER THE TRAP IN THE
DIRECTION OF THE CONDENSATE FLOW.
Figure 4: Vertical Condensate Drain
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* Some units include a painted drain connection.
Using a threaded pipe or similar device to clear
any excess paint accumulated inside this fitting
may ease final drain line installation.
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