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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 1" 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 unit 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.
NOTE: Unit cabinet, supply air duct and free blow
plenum are approved for "0" clearance to
combustible material.
FIGURE 7
Supply Duct Connections
ROOM SIDE OF
QC UNIT
The Q-TEC series units 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.
SUPPLY DUCT
TO BE FIELD
SUPPLIED
ATTACHMENT
SCREWS TO BE
FIELD SUPPLIED
DUCT FLANGE PROVIDED
WITH UNIT
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". See
Specifications Sheet for the correct Cabinet Extension
model number. 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 5. 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 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 2" filters. The tabs for the 1" filters must
be bent down to allow the 2" filters to slide in place.
FIGURE 8
Filter Location
FILTERS
RETURN AIR
GRILLE
Manual 2100-416J
Page
11 of 27
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