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Vertical, Industrial

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.

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 and caps are made of steel. All connections including the boil-out

are made of steel.

Technical Specifications

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 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 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

from over-pressure.

3. Accumulators may be insulated to prevent condensation or frost on the

outside of the shell.