9
5. Connect the suction and liquid lineset tubes.
CAUTION:
It is recommended that a wet rag be wrapped
around the suction line in front of the close off
plate or the sensing bulb (if TXV is installed)
before applying heat. Failure to keep components
cool during brazing may result in structural
damage, premature equipment failure, or possible
personal injury.
6. Braze the individual connections with dry nitrogen flowing
through the joints. NOTE: This will prevent internal oxidation
and scaling from occurring.
7. Wrap the refrigerant lines with pressure sensitive neoprene
or other suitable material especially where the lines enter
the opening in the sheet metal.
8. Evacuate the system of moisture and non-condensables
to prevent low efficiency operation or damage to the unit.
The suggested range of evacuation is 350 - 500 microns.
9. Charge the system with refrigerant. Refer to the outdoor
unit installation manual for additional charging instructions.
10. Check the system for leaks, including the lineset and the
brazed joints.
11. Replace all grommets and properly dispose of all removed
parts.
Condensate Drainage
CAUTION:
The air handler must be level to ensure proper
condensate drainage. An unlevel installation may
result in structural damage, premature equipment
failure, or possible personal injury.
• Methods for disposing of condensate vary according
to local codes. Refer to local codes or authority having
jurisidiction for restrictions and proper condensate disposal
requirements.
• Thedrainpanthatissuppliedwiththisairhandlercontains
a primary and secondary drain fitting. The condensate is
drained from the unit through two 3/4” female pipe fittings
located on the front side of the unit as shown in Figure 9.
• Thedrainpanmustbedrainedwitheldsuppliedtubing
or pvc pipe and adequately trapped. Both drain tubes
must have a minimum diameter of 3/4” and be trapped
separately.
IMPORTANT: Failure to install a trap may result in
condensation overflowing the drain pan, resulting in
substantial water damage to surrounding area.
• Routebothlinestoasuitabledrain,avoidingsharpbends
and pinching of the lines. The drain should maintain a
minimum horizontal slope in the direction of discharge of
not less than 1” vertical for every 10 ft of horizontal run.
• Iftheairhandlerislocatedinorabovealivingspacewhere
damage may result from condensate overflow, an auxiliary
drain pan shall be installed under the unit. A separate drain
line should extend from the pan to a conspicuous point
and serve as an alarm indicating that the primary drain
is restricted. As an alternative to a separate drain line,
an approved water level indicator or float switch device
may be used to shut down the unit in the event water is
detected in the auxiliary pan.
• Installasingle5inchtrapinthecondensatedrainlineas
close to the coil as possible. Make sure that the top of the
trap is below the bottom of the drain pan to prevent the
condensate from overflowing the drain pan. NOTE: There
must be only one trap in the drain line. Using more than
one trap may prevent drainage.
• Primethetrapwithwater.Insulatethedrainifitislocated
in an unconditioned space, and test the condensate line
for leaks. Consult local codes for additional restrictions or
precautions.
• During system checkout, inspect the drain line and
connections to verify proper condensate drainage.
3/4” Adapter w/
3/4” dia. hose barb
3/4” minimum dia.
PVC or flexible tubing
HORIZONTAL
DOWNFLOW
NOTES:
1. The drain lines must maintain a downward slope to ensure proper
condensate drainage.
2. Each condensate drain must be trapped separately using a J-Trap or
field supplied loop.
Figure 9. Condensate Drainage Example
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