Hussmann proto-aire Manuel De Montage

Protocol™ Installation and

Service Manual

Liquid Line

1. Take-offs to evaporators must exit the bottom of the liquid line. Provide an

expansion loop for each evaporator take-off (minimum 3-inch diameter).

2. Offtime and Electric Defrost may be reduced by one size after one half the case

load. Do not reduce below evaporator connection size.

Refrigeration Cycle
Oil Return System Not shown

Beginning with Compressors, refrigerant vapor is compressed into the Discharge Header.
The Turba-Shed oil separator effectively divides the refrigerant from the lubricant in the
system. The lubricant is then returned to the compressors. The Condenser dissipates the
unwanted heat from the refrigerant into either a water/ glycol, or, air condenser depending
on the type used. The receiver acts as a vapor trap and supplies the Liquid Line with
quality liquid refrigerant. A Liquid Line Filter/Drier removes water and other
contaminants from the refrigerant. The liquid branch line supplies liquid refrigerant to the
Thermostatic Expansion Valve (TXV), which in turn feed refrigerant to the cases
(evaporator coils). These coils pick up heat from the product stored in the cases. A
Suction Filter removes system contaminants from return vapor, which is factory supplied
but field installed. It is also a good idea to install isolation valves for ease of service. The
oil return system is not shown in the following illustration.

Turba-Shed
Oil Separator

Condenser

Receiver

Compressors

Discharge Header

Liquid Line
Filter / Drier

Suction Header

Case

Liquid Bra

ch L

Suction Branch Line

Sight Glass

Suction Line

Filter