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d. Position unit on Pedestal or other suitable foun-
dation. If Pedestal is not used, a frame strong
enough to support the total weight must be pro-
vided. Provide a minimum height of 14 inches
for proper unrestricted airflow.
e. If a return air duct is connected to the air han-
dler, it must be the same dimensions as shown
in the outline drawing.
f. Pedestal and unit should be isolated from the
foundation using a suitable isolating material.
HORIZONTAL LEFT
a. For
maximum
ease of filter maintenance, it is recommended
that a properly sized remote filter and grille
be installed for horizontal applications. Airflow
should not exceed the face velocity of the fil-
ter being used. The factory installed filter
should then be removed from the unit.
b. The unit is shipped from the factory in the hori-
zontal left airflow position.
c. Openings where field wiring enters the
cabinet must be completely sealed . The Re-
frigerant lines must be sealed and Electrical in-
lets need to be sealed both the low and the high
voltage.Location of power entry is shown on the
Outline Drawing.
d. The unit may be suspended as long as the unit
is supported from both ends as well as the mid-
dle to prevent sagging and service access is not
obstructed.
e. If the unit is not suspended it must be isolated
carefully to prevent sound transmission. Vibra-
tion isolators (purchased locally) must be placed
under the unit.
f. It is always recommended that an auxiliary
drain pan be installed under a horizontal air
handler (See Condensate Drain Piping) to pre-
vent possible damage to ceilings.
g. Isolate the auxiliary drain pan from the unit or
from the structure.
h. Connect the auxiliary drain line to a separate
drain line (no trap is needed in this line) and
terminate according to local codes.
i. If a return duct is connected to the Air Handler,
it must be the same dimensions as the return
opening shown in the outline drawings.
C. DUCT CONNECTIONS
The supply and return air ducts should be connected
to the unit with flame retardant duct connectors.
Convertible duct flanges are provided to make a "flush
fit" for ¾" or 1-1/2" ductboard applications. Three are
18-GD07D1-5
efficiency
and
Customer
Installer's Guide
located in the accessory kit shipped with the unit and
one is installed on the discharge opening. If the duct
flanges are not needed, the installed flange must be
removed. See the Outline drawing for sizes of the dis-
charge opening. After ductwork is secured, seal the
ductwork per local and national codes to prevent air
loss/infiltration.
D. REFRIGERANT PIPING
IMPORTANT:
Refrigerant piping must be routed to maintain service ac-
cess to blower compartment and provide easy removal of
filter access panel and filter.
1. Refrigerant connections are made outside the cabinet.
NOTE:
TXV bulb MUST be protected (wrap a wet rag around
the suction line between the TXV bulb and the braze
joint) or removed, while brazing the tubing. Overheat-
ing of the sensing bulb will affect the functional char-
acteristics and performance of the air handler.
2. If changing the Thermostatic valve (TEV/TXV), be
sure to use a wrench and backup wrench to tight-
en the mechanical fittings 1/6 turn past finger
tight upon installation.
3. Installation of refrigerant lines is covered in the in-
stallation instructions packaged with the outdoor
unit. Evacuation, leak testing and brazing pro-
cedures are included in those instructions. Read
those instructions before starting installation of
refrigerant lines.
NOTE:
TXV Equipped is Non-Bleed, and may require a start kit
on the outdoor unit.
NOTE:
Refrigerant line openings must be sealed along with
field wiring.
E. BRAZING TO EVAPORATOR SECTION
IMPORTANT:
Do noT unseal refrigerant tubing until ready to cut and
fit refrigerant lines.
1. Remove the sealing caps from indoor coil field con-
nections.
2. Field supplied tubing should be cut squared-off,
ensuring the tube is still round and free of burrs
at the connecting end. Clean the tubing to prevent
contaminants from entering the system.
3. Run refrigerant tubing into the stub sockets of in-
door unit coil. Refrigerant line openings must
be completely sealed.
4. Braze and evacuate according to indoor and out-
door installation instructions.
NOTE:
Painted areas of unit must be shielded during brazing.
3
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