Comfort-Aire HBH Series 1/2 to 5 Ton - Manual (Page 10)

IOM Instructions HBH/V COMPACT Heat Controller, Inc.
Horizontal Installation
*3/4" IPT
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.: 6/26/09S
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.
Condensate Piping – Horizontal Units
CAUTION!
Pitch the unit toward the drain as shown in Figure 2 to
improve the condensate drainage. On small units (less
than 2.5 tons/8.8 kW), 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.
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.
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 will 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.
If the unit is connected to existing ductwork, a previous
check should have been made to insure that the
ductwork has the capacity to handle the airflow required
for the unit. If ducting is too small, as in the replacement
of a heating only system, larger ductwork should be
installed. All existing ductwork should be checked for
leaks and repaired as necessary.
DUCT SYSTEM INSTALLATION