Tubing Preparation; Post Brazing; Piping Size - Daikin DAR Series Installation Instructions Manual

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 fol-
low 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 con-
denser/heat pump.
The DAR0904 coil is circuited to accept a single suction and liquid
line. The DAR1204 evaporator coil has (2) suction lines and (2)
liquid lines. When using a single outdoor unit with the DAR1204,
it is necessary to manifold the suction lines into a single connec-
tion. Similarly, the liquid lines of the DAR1204 are to be manifolded
when matched with a single condenser/heat pump. See the fol-
lowing sketch for additional details.
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.
TO SUCTION VALVE
OUTDOOR UNIT
TO LIQUID VALVE
OUTDOOR UNIT
DAR0904
TO SUCTION VALVE
OUTDOOR UNIT
TO LIQUID VALVE
OUTDOOR UNIT
DAR1204 SINGLE OUTDOOR UNIT
Note: The resulting manifolds are to be sized to accept the suc-
tion and liquid line diameters prescribed within the condenser
Installation Manual.
Multiple Condensers The DAR1204 can accept (2) condensers/
heat pumps. When using two condensers use the following pip-
ing 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
DAR1204 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.
NOTE: The use of a heat shield when brazing is recommended to
avoid burning the serial plate or the finish on the unit. Heat trap
or wet rags should be used to protect heat sensitive components
such as service valves and TXV valves.
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