6
IMPORTANT NOTE:
Ensure coil slides on the rails
along the groove provided
on the drain pan side walls.
Failure to do so will result in
improper condensate drainage.
Coil Slides
on the downflow bracket
COIL INSTALLATION FOR DOWNFLOW
Figure 8
ACCESS PANEL CONFIGURATION FOR DOWNFLOW
OR HORIZONTAL RIGHT
Figure 9
7
Refrigerant Lines
This product is factory-shipped with R410A and dry
nitrogen mixture gas under pressure. Use appropriate
service tools and follow these instructions to prevent
injury.
A quenching cloth is strongly recommended to prevent
scorching or marring of the equipment finish when
brazing close to the painted surfaces. Use brazing
alloy of 5% minimum silver content.
NOTE:
Refrigerant tubing must be routed to allow adequate
access for servicing and maintenance of the unit.
Do not install the air handler in a location that violates the
instructions provided with the condenser. If the unit is located
in an unconditioned area with high ambient temperature and/
or high humidity, the air handler may be subject to nuisance
sweating of the casing. On these installations, a wrap of 2"
fiberglass insulation with a vapor barrier is recommended.
7.1 Tubing Size
For the correct tubing size, follow the specification for
the condenser/heat pump.
7.2 Tubing Preparation
All cut ends are to be round, burr free, and clean. Failure
to follow this practice increases the chances for refriger-
ant leaks. The suction line is spun closed and requires
tubing cutters to remove the closed end.
NOTE:
To prevent possible damage to the tubing joints,
do not handle coil assembly with manifold or flowrator
tubes. Always use clean gloves when handling coil as-
semblies.
Applying too much heat to any tube can melt the tube. Torch
heat required to braze tubes of various sizes must be
proportional to the size of the tube. Service personnel must
use the appropriate heat level for the size of the tube being
brazed.
CAUTION
7.3 Special Instructions
Units without a factory installed TXV come equipped
with a flowrator piston for refrigerant expansion. For
most installations with matching applications, no
change to the flowrator piston is required. However, in
mix-matched applications, a flowrator piston change
may be required. See the piston kit chart (provided in
the literature packet) or consult your local distributor
for details regarding mix-matched flowrator piston siz-
ing. If the mix-match application requires a different
flowrator piston size, change the flowrator piston in the
flowrator body on the indoor coil before installing the
coil and use the procedure in section 8.4.
