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FRESH AIR INTAKE
This unit is equipped with a fresh air damper assembly.
The damper blade is locked in the closed position
when the unit is shipped from the Factory. To allow
the damper to operate remove the two plastic locking
pins, one on each end of the blade. This will allow for
maximum fresh airflow. The damper blade will now
open when the indoor blower is operating. If less than
maximum fresh airflow is required, reinsert the plastic
pins to limit damper blade opening to desired level.
Two extra pins are provided (taped to the inside of the
assembly) which may be used to hold the blade in some
position other than minimum or maximum position.
This fresh air assembly is located in the rear of the unit
and to gain access to make these adjustments remove
the air filter service door.
All capacity, efficiency and cost of operation
information as required for Department of Energy
"Energyguide" Fact Sheets are based upon the fresh
air blank-off plate in place and is recommended for
maximum energy efficiency.
The blank-off plate is available upon request from the
factory and is installed in place of the fresh air damper
shipped with each unit.
For details on energy recovery ventilation see Page 30.
SERVICE LIGHT
The unit is equipped with a service light which signals
the user that service is required. The light is located
in the upper control panel and is visible only when the
hinged service/filter access door is open.
The Service Unit light indicates that the unit has
been shut off by a high or low pressure device. This
indicates that the unit needs to be serviced. See
Sequence of Operation for details.
CONDENSATE DRAIN
There are two drain connections on the unit. The rear
drain is the primary drain, and is located on the right
lower rear panel of the unit. The optional side drain is
located on the bottom right side of the unit. The side
drain is shipped with a plug installed.
The side drain requires a water trap for proper drainage.
See Figure 9. The drain can be routed through the floor
or through the wall. If the drain is to be routed through
an unconditioned space, it must be protected from
freezing. The drain line must be able to be removed
from the unit if it is necessary to remove the unit from
the wall. When the side drain is used, the plug must be
removed and installed in the rear drain outlet.
The rear drain can be used with wall thickness of up to
10 inches where a water trap can be installed between
the unit and the interior wall. See Figure 10. The trap
cannot extend beyond the edge of the unit or it will
interfere with the wall mounting bracket. The drain
can be routed through the floor or through the wall. If
the drain is routed through the wall, the drain line must
be positioned such that it will not interfere with the
sleeve flange or the grille. See Figure 11. If the drain
is to be routed through an unconditioned space, it
must be protected from freezing.
OPTIONAL REAR DRAIN KITS
Optional Rear Drain Kit, Bard Model QCDS48A,
is also available for these products. The optional
rear drain kit offers multiple benefits that include the
following:
• Allows unit to be rolled away from the sleeve
without having to disconnect any hard plumbing
connections.
• Allows indoor coil condensate to be easily
connected to Rear Drain Box while bypassing the
outdoor coil drain pan. This aids in minimizing
the potential for biological growth to occur by
minimizing the standing water and exposing it to
warm temperatures.
See Figures 12A, 12B, 12C and 12D.
The drain box permanently mounts onto the wall sleeve
and is then either piped directly outdoors, or can be
piped vertically. The Q-TEC unit is then equipped with
fittings on the rear of the unit that slide into the drain
box as it is wheeled towards the wall sleeve.
NOTE: On models equipped with a refrigerant
subcooler in the lower drain pan may experience a
2-3% decrease in cooling performance and efficiency
when the indoor condensate is routed around the
outdoor coil drain pan/subcooler assembly. Unit
rated performance and efficiency are with the indoor
condensate routed to the outdoor coil pan.
There is also a heated version of the rear drain box
available (Model #QCDS48H) for installation in
northern climates where freezing may occur.
Manual
2100-601B
Page
11 of 42
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