A CU MANUAL
IOM-14 14 of 46 Feb 06 R4
Suction Accumulators
Suction accumulators are installed in the suction line close to the
compressor. These devices are designed to trap slugs of liquid
before they can cause damage to the compressor.
Accumulators are REQUIRED on:
1. Systems with multiple DX coils in series. All compressors on
the downstream DX coils require accumulators.
2. Systems with over 75 feet (20m) of piping.
3. All systems that operate below 50°F (10°C) ambient
temperature.
4. All systems with underground piping. (Underground piping
is not recommended, and may void warranty)
Consult Factory on all systems with
underground refrigerant piping.
Underground piping will void compressor
warranty unless specifically authorized by
Engineered Air.
Accumulators are STRONGLY RECOMMENDED on:
1. 100% Outside air systems.
2. VAV systems.
3. Process cooling systems that experience rapid load changes.
Condensing units may be ordered with suction accumulators installed at the factory (optional) or they may
be field supplied and installed.
Discharge Holding Tank (Optional)
The Discharge Holding Tank (DHT) is designed to provide additional volume
to the system. The DHT is used when the entire system charge cannot be
held by the condenser. This occurs on split systems with long piping runs
where the pump down charge will not fit into the condenser.
It is installed between the compressor and the condenser to prevent the
liquid refrigerant from filling the discharge line and/or compressor during
the idle state. The DHT is not a receiver.
COMPRESSOR
TO
COIL
FROM
DEFLECTOR
INLET
ORIFICE
METERING
SUCTION ACCUMULATOR
FUSIBLE PLUG
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