Refrigerant Lines; Tubing Size; Tubing Preparation; Tubing Connections - Amana AVPEC Series Installation & Operating Instructions Manual

6. Reconnect the sensor wires and replace the insulation se-
curing it with wire ties on both sides as shown in Figure 2-2.
Then, secure the wire harness to the corner post using the
screw mount wire ties provided.
7. Re-install the access panels removed in Step 1 as shown in
Figure 10.
8. Two drain ports located at the bottom drain pan (horizon-
tally oriented) are to be used for upflow and downflow ap-
plications and the two on the side drain pan (vertically ori-
ented) are to be used when the unit is in horizontal right or
left configuration. When the unit is in upflow or downflow
configuration, the drain ports located on bottom drain pan
must be plugged and vice versa. Drain ports located at lower
elevation (closer to the ground) in either configuration must
be connected to the main drain line and the higher is for the
secondary drain line.

7 REFRIGERANT LINES

NOTE: Care should be taken to route refrigerant tubing in a way
which allows adequate access for servicing and maintenance of
the air handling unit.
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.
Do not install the air handler in a location that violates the instruc-
tions provided with the condenser. If the unit is located in an un-
conditioned area with high ambient temperature and/or high hu-
midity, 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, refer to the outdoor AIR CONDI-
TIONING OR HEAT PUMP INSTALLATION & SERVICE REFER-
ENCE.

7.2 Tubing Preparation

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.
CAUTION
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.
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 INSTALLATION FOR DOWNFLOW
All cut ends are to be round, burr free, and clean. Failure to
follow this practice increases the chances for refrigerant 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 assemblies.
NOTE: The use of a heat shield is strongly recommended
when brazing to avoid burning the serial plate or the finish
of the unit. Heat trap or wet rags must be used to protect
heat sensitive components such as service valves, electronic
expansion valve (EEV), thermistors and pressure sensors.

7.3 Tubing Connections

AVPEC models come with factory installed electronic expan-
sion valve (EEV) pre-installed on the vapor tube.
1 Remove refrigerant tubing panel or coil (lower) access
panel.
2. Remove access valve fitting cap and depress the valve
stem in access fitting to release pressure. No pressure
indicates possible leak.
3. Replace the refrigerant tubing panel.
4. Remove the spin closure on both the liquid and suction
tubes using a tubing cutter.
5. Insert liquid line set into liquid tube expansion and slide
grommet about 18" away from braze joint.
7
Coil slideson
the downflow bracket
Figure 9