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SUCTION LINE ACCUMULATORS
The function of a Suction Line Accumulator is to provide temporary
storage and controlled return of liquid refrigerant and oil to protect
the compressor from damage by sudden surges of liquid.
Suction Line Accumulators are installed in air conditioning and refrigeration
systems where sudden return of liquid down the suction line is possible.
Suction Line Accumulators are designed to meter both liquid refrigerant and
oil back to the compressor at a controlled rate. In addition to protecting the
compressor from damage, the Accumulator helps maintain system efficiency
and proper crankcase oil levels.
The Heat Exchanger models are designed to be used on low temperature
systems to sub-cool the liquid line. Passing the liquid line through the heat
exchanger coil on the Accumulator also helps to boil off liquid refrigerant in
the Accumulator. Heat Exchanger models can help to improve system
efficiency while helping oil flow in the suction line. To avoid overheating the
compressor, do not use discharge gas through the heat exchanger coil.
Henry Technologies' ASME Standard and 1” NPT Suction Line Accumulators
are suitable for use with ammonia, HFC and HCFC refrigerants and their
associated oils, as well as other industrial fluids non-corrosive to steel. ASME
Heat Exchanger Suction Line Accumulators are suitable for use with HFC
and HCFC refrigerants and their associated oils, as well as other industrial
fluids non-corrosive to steel and copper.
Heat Exchanger models available
Mounting Legs on all models
Models available with 1” NPT fitting for S-9400-1 type level switch
Prevents liquid slugging
Controlled liquid refrigerant and oil return
Materials of Construction
The shell, caps and all connections are made of steel. The heat exchanger
coils are made of solid copper or steel depending on size.
Maximum working pressure 8-5/8” to 10-3/4” = 450 PSI (31 Bar)
Allowable operating temperature = -40°F to +250°F (-40°C to +121°C)
Henry Technologies' Suction Line Accumulators are constructed to ASME
Section VIII. Additionally, Suction Line Accumulators are designed and
registered for use in Canada. Please contact Technical Support at 1-800-
627-5148 for CRN details and list of approved provinces and territories.
Suction Line Accumulators can be CE marked in accordance with PED by
adding a “-CE” suffix to the part number. (i.e. S-7722HE-CE)
Maximum working pressure 12-3/4” to 20” = 400 PSI (27.6 Bar)
How it Works
Refrigerant vapor from the evaporator enters the Suction Line Accumulator,
along with any liquid refrigerant and oil. The liquid is held at the bottom of
the Accumulator until it is metered back to the compressor. A tube-in-tube
assembly is connected to the outlet of the Accumulator to ensure vapor is
returned to the compressor. On Vertical Accumulators, liquid is metered
back to the compressor via an orifice at the bottom of the tube-in-tube
assembly. This metering only occurs when the compressor is running.
Selection of a Suction Line Accumulator should be made based on three
1. The Accumulator should have adequate liquid holding capacity.
Normally this should not be less than 50% of the total system charge.
2. The Accumulator should be selected in order to avoid excessive
pressure drop in the system.
3. The Accumulator should have the capability of returning liquid at the
proper rate under a range of load conditions. The listed minimum
tonnage ratings ensure sufficient flow for proper liquid refrigerant and
Installation - Notes
1. Install the Accumulator after the Suction Line Filter-Drier.
2. An NPT fitting is provided at the top of the vessel for installation of a
Pressure Relief Device. The user must ensure the vessel is protected
3. For low temperature applications heat bands should be installed at the
bottom of the Vertical Accumulator.
4. Accumulators may be insulated to prevent condensation or frost on the
outside of the shell.
5. Full instructions are given in the Product Instruction Sheet, included
with each unit.