Comfort-Aire HBH Series 6-10 Tons - Manual (Page 11)

Heat Controller, Inc. HBH SERIES IOM Manual
10
Horizontal Installation
*3/4" FPT
Trap Depth
1.5" [38mm]
Min 1.5"
[38mm]
1/4" per foot
(21mm per m)
drain slope
3/4" PVC or
Copper by others
Rev.: 4/30/10B
Vent
* 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.
Figure 6: Horizontal Condensate Connection
CAUTION! Ensure condensate line is pitched toward drain
1/4” per foot [21mm per m] of run.
� CAUTION! �
Duct System Installation
Horizontal Units Condensate Piping - Pitch the unit
toward the drain as shown in Figure 2 to improve the
condensate drainage. Insure that unit pitch does not cause
condensate leaks inside the cabinet.
Install condensate trap at each unit with the top of the trap
positioned below the unit condensate drain connection as
shown in Figure 6. Design the depth of the trap (water-
seal) based upon the amount of 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 flush 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 5: Right Return Side Discharge to Back
RIGHT RETURN SIDE DISCHARGE
CBP
Drain
FRONT
CBP
FRONT
RIGHT RETURN END DISCHARGE
RETURN AIR
Drain
RETURN AIR
Duct System Installation - Proper duct sizing and design
is critical to the performance of the unit. The duct system
should be designed to allow adequate and even airflow
through the unit during operation. Air flow through the unit
MUST be at or above the minimum stated airflow for the
unit to avoid equipment damage. Duct systems should
be designed for quiet operation. Refer to Figure 3 for
horizontal duct system details or figure 8 for vertical duct
system details. A flexible connector is recommended for
both discharge and return air duct connections on metal
duct systems to eliminate the transfer of vibration to the
duct system. To maximize sound attenuation of the unit
blower, the supply and return plenums should include
internal fiberglass duct liner or be constructed from
ductboard for the first few feet. Application of the unit to
uninsulated ductwork in an unconditioned space is not
recommended, as the unit’s performance may be adversely
affected.
At least one 90° elbow should be included in the supply
duct to reduce air noise. If air noise or excessive air flow is
a problem, the blower speed can be changed. For airflow
charts, consult submittal data for the series and model of the
specific unit.
CAUTION!
! !