3.0 INSTALLATION
3b.) TYPICAL PIPING SCHEMATIC – HEAT PUMP (WITH OPTIONAL ACCESSORY
AS INDICATED)
3.7 REFRIGERANT PIPING
1.) Prior to connecting the tubes, make sure to
apply blind caps or water proof tape to
prevent dust or water from getting into the
tubes.
Model Max.
Allowable
Piping Length (L)
Elevation Difference
Between Two Units
ACCS 68-1520
75 ft
30 FT
2.) Horizontal discharge and suction lines
should be sloped in the direction of flow at
a rate of 1” [25.4mm] for every 20ft [6.1m]
in order to aid oil drainage. If there is a
vertical riser of more than 5ft [1.5m] on
the suction line, there should be a trap at
the bottom. For long suction vertical riser,
additional trap is recommended for each
20ft [6.1m] of riser to insure proper oil
return.
3.) The suction and liquid line should be sized
according to the manufacturers standard.
4.) Minimize the exposure time to atmosphere
during brazing.
5.) Drain pipe size should be the same or
bigger than the existing pipe. The pipe
should be installed in downward slope so
that water is drained by gravity. A trap
must be provided on the pipe so that
condensate will drain and not overflowing
the drain pan. In addition, upon start-up,
the water will not be sucked by the blower.
In addition, the evaporator coil is located
before the intake of the centrifugal blowers
and operates below atmospheric pressure.
Thus, to compensate for this pressure
differential, a trap is required.
6.) Suction line must be insulated to prevent
condensation. It is also suggestable to
insulate the liquid line. Insulating these
line will prevent unnecessary heat losses/
gains.
7.) This unit is designed to run up to max pipe
length (single distance) 75ft [22.9m]. For
length exceeding 75ft [22.9m], consult
factory for assistance (piping size need to
be changed and oil need to be added.).
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