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LV Heat Pump Series
Step-5 Check Duct System
All units are provided with a return air duct flange and
supply air duct connections. Refer to unit dimensional
drawings (Page# 55).
A flexible duct connector is recommended for supply
and return air duct connections on metal duct systems.
All metal ducting should be insulated with a minimum of
1"inch duct insulation to avoid heat loss or gain and
prevent condensate from forming during the cooling
operation. Application of the unit to uninsulated duct
work is not recommended as the unit's performance will
be adversely affected.
If the unit will be installed in a new installation with new
duct work, the installation should be designed using
current ASHRAE procedures for duct sizing. If the unit
will be connected to an existing duct system, a check
should be made to assure that the duct system has the
capacity to handle the air required for the unit
application. If the duct system is too small, larger duct
work must be installed. Be certain to check for existing
leaks and repair.
The duct system and all diffusers should be sized to
handle the designed air flow quietly. To maximize sound
attenuation of the unit blower, the supply and return air
plenums should be insulated. There should be no direct
straight air path through the air grill into the heat pump.
The return air inlet to the heat pump must have at least
one 90° turn away from the space return air grill. If air
noise or excessive air flow are a problem, the blower
speed can be changed to a lower speed to reduce air
flow.
Do not connect discharge ducts directly to
the blower outlet. Use ashrae guidelines for
duct sizing
The factory filter rack should be left in place
on a free return system.
Horizontal Supply Air Configuration
Conversion
The supply air location on horizontal units can be quickly
field converted from end blow to straight through or vice
versa. To convert the supply air direction, follow the
steps below:
1.
If connected to power, shut off the unit and
disconnect switch or circuit breaker.
2.
Unscrew and remove the blower access panel.
3.
Disconnect the wires from the unit electrical box to
the blower motor. Note which speed taps are wired
for units with PSC or constant torque motors.
4.
Unscrew and carefully remove the blower panel with
the blower and motor attached. Be careful not to
damage the refrigerant coils or any other internal
unit components.
5.
Remove the blower support brackets from the
bottom of the blower housing and relocate them to
the top of the blower housing.
LV Heat Pump Series
6.
Turn the blower panel 180
support brackets are now at the bottom of the
blower.
7.
Insert the blower panel with the blower and motor
into the desired location. Be careful not to damage
the refrigerant coils or any other internal unit
components. Screw the panel into place.
8.
Replace the wires between the blower motor and
electrical box. Make sure to connect wires to the
proper speed taps.
9.
Replace the blower access panel.
10. Reconnect power to the unit.
Step 6-Install Condensate Drain.
A drain line must be connected to the heat pump and
pitched away from the unit a minimum of 1/8-inch per
foot to allow the condensate to flow away from the unit.
This connection must be in conformance with local
plumbing codes. A trap must be installed in the
condensate line to ensure free condensate flow. (Heat
pumps are not internally trapped). A vertical air vent is
sometimes required to avoid air pockets.
(See figure # 7)
.
Figure # 7 Condensate Drain
The depth of the trap depends on the amount of positive
or negative air pressure on the drain pan while the unit
fan is operating. A second Trap must not be included.
The Horizontal unit should be pitched approximately
1/4 inch towards the drain in both directions, to
facilitate condensate removal.
(see figure # 8)
Figure # 8 Pitched Unit
Installation | 9
°
so that the blower
8 733 905 683 (2016/09)
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