AMST Installation Manual

7
HORIZONTAL LEFT

HORIZONTAL RIGHT

7 Refrigerant Lines
WARNING
THIS PRODUCT IS FACTORY-SHIPPED WITH R410A AND DRY
NITROGEN MIXTURE GAS UNDER PRESSURE. USE APPRO-
PRIATE SERVICE TOOLS AND FOLLOW THESE INSTRUCTIONS
TO PREVENT INJURY.
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 air handler cabinet. On

vapor barrier is recommended.
7.1 Tubing Size

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 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,

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
Heat trap or
wet rags must be used to protect heat sensitive
components such as service valves and TXV valves
sensing bulb.
WARNING
A QUENCHING CLOTH IS STRONGLY RECOMMENDED TO PRE-
VENT 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 VARI-
OUS 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.
7.3 Tubing Connections
An adjustable TXV with bulb is installed on the vapor tube
from the factory.
1. Remove refrigerant tubing panel or coil (lower) access
panel.
2. 

pressure indicates possible leak.
3. Replace the 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.
6. Insert suction line set into suction tube expansion and
slide insulation and grommet about 18” away from
braze joint.
7. Braze joints. Quench all brazed joints with water or a
wet rag upon completion of brazing.