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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.
Henry Technologies' AF-Series 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.
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 and caps are made of steel. All connections including the boil-out
are made of steel.
Maximum working pressure 6-5/8” to 20” = 400 PSI (27.6 Bar)
Maximum working pressure 24” = 300 PSI (20.7 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.
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.
Oil return is assured from the Accumulator through the tube-in-tube assembly
at full gas flow conditions. The use of compressor suction un-loaders will
reduce the gas CFM flow rate and the oil return rate will be affected if
maintained for a long period. Hot gas bypass for capacity reduction will
maintain constant CFM. The tube-in-tube assembly may not be required
under conditions where oil rich refrigerant can be drained from the bottom of
the accumulator through a needle valve, sight glass and solenoid valve
(cycle with the compressor). The needle valve should be set to flash off the
refrigerant and the oil bled by gravity into the suction line.
A Boil-Out is recommended under low temperature conditions and is
essential for all hot gas defrost systems. The liquid line should be routed
through the boil-out coil to provide a steady heat source to evaporate off
liquid trapped in the accumulator. The liquid should be evaporated before
commencement of the next defrost cycle.
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 within the maximum CFM rating
provided in order to avoid excessive pressure drop in the system.
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. Accumulators may be insulated to prevent condensation or frost on the
outside of the shell.