Duct Work; Filters; Condensate Drain - Bard Q-TEC Series Literature Assembly

DUCT WORK

Any heat pump is more critical of proper operating
charge and an adequate duct system than a straight air
conditioning unit. All duct work must be properly sized
for the design airflow requirement of the equipment.
Air Conditioning Contractors of America (ACCA) is
an excellent guide to proper sizing. All duct work or
portions thereof not in the conditioned space should be
properly insulated in order to both conserve energy and
prevent condensation or moisture damage. When duct
runs through unheated spaces, it should be insulated
with a minimum of one inch of insulation. Use
insulation with a vapor barrier on the outside of the
insulation. Flexible joints should be used to connect
the duct work to the equipment in order to keep the
noise transmission to a minimum.
The QW*S Series Heat Pump has provisions to attach a
supply air duct to the top of the unit. Duct connection
size is 10 inches x 25 inches nominal for QW2S and
QW3S models. Duct connection size is 10 inches x
30 inches nominal for QW4S and QW5S Models. The
duct work is field supplied and must be attached in a
manner to allow for ease of removal when it becomes
necessary to slide the unit out from the wall for service.
See Figure 7 for suggested attachment method.
NOTE: Unit cabinet, supply air duct and free blow
plenum are approved for "0" clearance to
combustible material.
The Q-TEC Series heat pumps are designed for use
with free return (non-ducted) and either free blow
with the use of QPB Plenum Box or a duct supply air
system.
The QPB plenum box mounts on top of the unit and
has both vertically and horizontally adjustable louvers
on the front discharge grille.
FIGURE 7
Supply Duct Connections
MODEL
QW2S, QW3S
QW4S, QW5S
"A"
ROOM SIDE
OF QW UNIT
"A" "B"
10" 25"
10" 30"
"B"
SUPPLY DUCT TO
BE FIELD SUPPLIED
ATTACHMENT
SCREWS TO
BE FIELD
SUPPLIED
DUCT FLANGE
PROVIDED WITH UNIT
MIS-2742 A
When used with a ducted supply, a QCX cabinet
extension can be used to conceal the duct work above
the unit to the ceiling. This extends 20" above the
unit for a total height above the floor of 10'-7/8". The
unit is equipped with a variable speed indoor blower
motor which increases in speed with an increase in
duct static pressure. The unit will therefore deliver
proper rated airflow up to the Maximum ESP shown in
Table 4 on page 30. However, for quiet operation of
the air system, the duct static should be kept as low as
practical, within the guidelines of good duct design.

FILTERS

Two 2-inch pleated filters are supplied with each unit.
The filters fit into a fixed rack.
The filters are serviced from the inside of the building.
To gain access to the filters release the latch on the
circuit breaker door and one 1/4 turn fastener near the
bottom of the door. This door is hinged on the left so it
will swing open.
The internal filter brackets are adjustable to
accommodate 1-inch filters. The tabs for the 1-inch
filters must be bent up to allow the 1-inch filters to
slide in place.

CONDENSATE DRAIN

The condensate drain hose is routed down from the
evaporator drain pan on the right side of the unit
into the compressor compartment. There are three
locations that the drain can exit the cabinet.
If the drain is to be hard plumbed, there is a 3/4 inch
PVC female adapter located on the cabinet rear panel.
In these installations, the drain tube is to be slipped
over the pipe connection inside of the cabinet; this is
how it is shipped from the factory (see Figure 8C on
page 15).
For a stand pipe type of drain, the drain hose can exit
the rear of the cabinet. There is adequate hose length
to reach the floor on the right hand side of the unit
(see Figure 8A).
NOTE: Whichever type of drain connection is used a
"P" trap must be formed (see Figure 8A on
page 14).
Manual 2100-738A
Page 13 of 71