Refrigerant Lines; Tubing Preparation; Post Brazing; Piping Size - Daikin DAX Series Installation Instructions Manual

of the airhandler. Do not screw the heat kit into the
duct flanges. See the following drawing for details:
The wires from the heat kit are to be routed through the
pipe nipple into the air handler electrical compartment.
See the "Electrical Connection" section of this manual for
wiring details.

Refrigerant Lines

This product is factory-shipped under pressure. Follow
these instructions to prevent injury.
A quenching cloth is strongly recommended to prevent
scorching or marring of the equipment finish when welding
close to the painted surfaces. Use brazing alloy of 5%
minimum silver content.

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 pipe
cutters to remove the closed end.

Post Brazing

Quench all welded joints with water or a wet rag.

Piping Size

For the correct tubing size, follow the specification for the
condenser/heat pump.
The DAX can be connected to a single condenser/heat
pump, or connected to 2 condensers/heat pumps. When
using a single outdoor unit, it is necessary to manifold the
suction lines into a single connection. Similarly, the liquid
lines are to be manifolded when matched with a single
condenser/heat pump. See the following sketches for
additional details.
WARNING
WARNING
On a 7 ½ ton DAX unit you can use either one 7 ½ ton
condenser or two 4 ton condensers.
On a 10 ton DAX unit you can use either one 10 ton
condenser or two 5 ton condensers.
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.
TO SUCTION VALVE
OUTDOOR UNIT
TO LIQUID VALVE
OUTDOOR UNIT
SINGLE OUTDOOR UNIT
NOTE: The resulting manifolds are to be sized
to accept the suction and liquid line diameters
prescribed within the condenser Installation
Manual.

Multiple Condensers

The DAX can accept (2) condensers/heat pumps. When
using two outdoor units, use the following piping procedure:
TO SUCTION VALVE
#1 OUTDOOR UNIT
TO SUCTION VALVE
#2 OUTDOOR UNIT
TO LIQUID VALVE
#1 OUTDOOR UNIT
TO LIQUID VALVE
#2 OUTDOOR UNIT
TWO OUTDOOR UNITS
IMPORTANT NOTE: Torch heat required to braze
tubes of various sizes is proportional to the size
of the tube. Tubes of smaller size require less
heat to bring the tube to brazing temperature
before adding brazing alloy. Applying too much
heat to any tube can melt the tube. Service
personnel must use the appropriate heat level for
the size of the tube being brazed.
8
CAUTION