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Vertical, ASME

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.

Main Features


ODS connections


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.

Technical Specifications

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 Guidelines

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

oil return.

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

from over-pressure.

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.