6
DOWNFLOW
Figure 3
HORIZONTAL LEFT
Figure 4
HORIZONTAL RIGHT
Figure 5
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 locat-
ed in an unconditioned area with high ambient temperature
and/or high humidity, the air handler may be subject to nui-
sance sweating of the air handler cabinet. On these installa-
tions, 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. Fail-
ure to follow this practice increases the chances for re-
frigerant leaks. The suction line is spun closed and re-
quires 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.
7.3 Special Instructions
Units without a factory installed TXV come equipped with
a flowrator piston for refrigerant expansion. For most in
-
stallations 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 pack-
et) or consult your local distributor for details regarding
mix-matched flowrator piston sizing. 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 proce-
dure in section 7.4.
NOTE:
The use of a heat shield is strongly recommend-
ed 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 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.
