Heat Controller HTV Series - Page 12

HTV/HTD/HTH SERIES Heat Controller, Inc.
11
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 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.
*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!
Duct System Installation
The duct system should be sized to handle the design
airow quietly. Refer to Figure 3 for horizontal duct system
details or gure 8 for vertical duct system details. A exible
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 berglass duct liner or be
constructed from ductboard for the rst 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 ow is
a problem, the blower speed can be changed. For airow
charts, consult specications catalog for the series and
model of the specic 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 airow 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 1/4" per foot [21mm per m] of run.