R e s i d e n t i a l H & V - 6 0 H z H F C - 4 1 0 A :
R e v : O c t o b e r 5 , 2 0 2 1
10
G e o t h e r m a l H e a t i n g a n d Co o l i n g
2”
1.5”
1.5”
1/8” Per
Foot
Figure 6: Horizontal Condensate Connection
Horizontal Installation
Condensate Piping – Horizontal Units
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. 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.
⚠
CAUTION!
⚠
Duct System Installation
The duct system should be sized to handle the design
airflow quietly. 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 specifications catalog 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
CAUTION!
Ensure condensate line is pitched toward drain
1/8 inch per ft [11mm per m] of run.
