G – Piping Connection
INM.XX.X.00 G-3 April, 2018
Outdoor Air Condenser Piping (NC models)
Current sub-chapter applies to outdoor condensers NC models, serving DS series dehumidifiers.
Line Set Selection and Sizing
Refer to dehumidifier and/or condenser main labels for line set sizing (both, max line set length and pipes’
diameters):
o note that line set pipe diameters may differ from respective piping connections size at the dehumidifier
and condenser – refer to the equipment’s main label.
o one-way line set length (liquid OR hot gas line length) must not exceed max line set length, indicated
on the main label (typically – 50’).
The outdoor air condenser, in general, can be located above, below or at the same level as the dehumidifier,
however some limitation may apply:
o Consult the factory if the condenser is to be located 20’or more below the dehumidifier.
Standard recommended pipe and fitting materials are refrigeration grade copper piping/tubing – refer to
material applicability according to given application (refrigerant type, max working pressure, etc.).
Piping
Ensure proper piping support and bracing is in place – condenser and dehumidifier pipe terminations do not
provide structural support for pipe line set.
Proper piping practices (cleaning, sanding, reaming, wet-ragging during brazing, etc.), tools (pipe cutters,
torches, etc.) and bonding methods, respective to pipe and fittings material must be followed/used.
o Refrigeration piping/tubing must be brazed using respective brazing equipment and materials (flux, Sil-
Fos® 5 brazing rod/wire or better etc.)
o Where applicable, only refrigerant-approved lubricant/sealant in threaded connections should be
used.
o Purge the air from the line set and condenser with nitrogen prior to brazing to avoid soot built-up inside
the lines – soot/debris may potentially plug refrigeration circuit devices and cause failure.
Identify correct system pipe terminations on condenser and dehumidifier (typically labeled as “HG/hot gas” and
“LQ/liquid”). Connect similarly labeled terminations (HG to HG, LQ to LQ).
If the condenser is installed above the dehumidifier, install an oil trap at the start of and at every 15’ of
vertical lift in the hot gas line as shown on Pic. G.4.
Pitch the horizontal lines a min ½” every 5’ in the direction of flow.
Keep the hot gas and liquid lines a min of 2” apart to prevent heat transfer. Insulate the hot gas line where a
person may come in contact with the line and be in danger of burning themselves.
CAUTION! The dehumidifier typically is shipped pre-charged with refrigerant. Before cutting dehumidifier’ pipe
stubs off to connect line set - ensure that dehumidifier isolating hot gas and liquid ball valves are closed.
o Isolating ball valves typically have access ports that could be used for nitrogen purging, pressure
testing, evacuating and charging. Check access ports for any pressure in the pipe stubs before cutting.
o Add access port(s) to the line set or at the condenser, if needed.
Note: Do NOT exceed max line set length stated on the equipment’s main label. Excessive line set length could
result in equipment malfunction and premature failure. Do NOT increase lines diameters (oversizing line set) to
compensate for excessive line set length – consult the factory first.
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