Duct Work; Filters; Figure 7 Supply Duct Connections; Figure 8 Filter Location - Bard Q-TEC Q24H3DA Installation Instructions Manual

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 Q-TEC series heat pump has provision to attach a
supply air duct to the top of the unit. Duct connection
size is 12" x 20". 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.
FIGURE 7
Supply Duct Connections
Room side of
Q-TEC unit
NOTE: Unit cabinet, supply air duct and duct free
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 and QPBHW Plenum Box mounts on top
of the unit and has both vertically and horizontally
adjustable louvers on the front discharge grille.
Manual 2100-653
Page 10 of 44
For hot water coil option, a QPBHWxx-F for free blow or
QPBHWxx-D for ducted airflow is used.
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 9.
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 1" throw away filters [(1) 16x16 and (1) 16x20]
are supplied with each unit. The filters slide into filter
brackets (see Figure 8).
The filters are serviced from the inside of the building
by opening the hinged door. This door is attached by
one torx screw and one locking latch.
The internal filter brackets are adjustable to
accommodate 2" filters. The tabs for the 1" filters
must be bent down to allow the 2" filters to slide in
place.
Supply duct
(field supplied)
Attachment
screws (field
supplied)
Duct flange provided
with unit
Return Air Grille
FIGURE 8
Filter Location
Filters