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Safety Relief Devices
Data Aire’s low ambient receiver(s) include a suitable fusible plug safety relief device installed on the
receiver housing. The fusible plug is a onetime discharge device and must be replaced in the event of
a receiver over temperature condition. The fusible plug allows refrigerant to release at a controlled rate
and relieves an over temperature/pressure condition in the receiver.
See section 2.28 Refrigerant Piping Protection for additional information regarding piping and receiver
over pressure protection.
Receiver Installation
Be sure the receiver capacity is large enough to store the winter charge during summer operations and
is generally designed so that receiver can hold at least the same volume as the condenser coil.
The receiver package(s) is typically mounted outdoors, near the condenser. If the receiver package(s)
are installed indoors, a check valve is required on the liquid line at the condenser outlet and a liquid
line relief valve.
When installing the Low Ambient Control (LAC) valve, be sure to place the sensing bulb on the liquid
line leaving the receiver and insulate it properly.
The temperature controller, which is supplied as part of the receiver package, will maintain the receiver
shell temperature at approximately 50°F (10C) which will keep the internal refrigerant at a pressure
high enough to allow cold ambient starting.
A check valve must be used in the liquid line between the flooded head pressure control valve and the
receiver to prevent refrigerant from migrating from the warm receiver back to the cold condenser during
the off cycle.
Pipe routing of the Head Pressure Control Valve must not trap any oil when operating in the summer
conditions.
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