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P78 Series Controls for Dual Pressure Applications
Installation Instructions
Applications
P78 Series Controls for Dual Pressure Applications provide combined high and low pressure control of
compressors on commercial refrigeration and air
-
conditioning applications.
P78 control models with Single-Pole, Double-Throw (SPDT) switches allow users to install alarm devices or other
control circuits.
These controls are available in several pressure ranges and are compatible with most common refrigerants. They
may also be used on air, water, and other non-corrosive fluid applications.
Dual pressure P78MCA Type models with Manual Reset Lockout lock out when the Cut-out pressure is reached
and do not automatically reset after the control has cut out, providing shutdown capability for unmonitored
equipment. See
Manual Reset Operation
.
Type 1 enclosures are standard on most models.
IMPORTANT:
Use this P78 Series Control only as an operating control. Where failure or malfunction of the
control could lead to personal injury or property damage to the controlled equipment or other property, additional
precautions must be designed into the control system. Incorporate and maintain other devices, such as
supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or
malfunction of the control.
IMPORTANT :
Utiliser ce P78 Series Control uniquement en tant que dispositif de contrôle de fonctionnement.
Lorsqu'une défaillance ou un dysfonctionnement du contrôle risque de provoquer des blessures ou
d'endommager l'équipement contrôlé ou un autre équipement, la conception du système de contrôle doit
intégrer des dispositifs de protection supplémentaires. Veiller dans ce cas à intégrer de façon permanente
d'autres dispositifs, tels que des systèmes de supervision ou d'alarme, ou des dispositifs de sécurité ou de
limitation, ayant une fonction d'avertissement ou de protection en cas de défaillance ou de dysfonctionnement
du contrôle.
P78 Series Controls for Dual Pressure Applications
Installation Instructions
P78LCA, P78MCA
Part No. 24-7664-3183, Rev. A
Issued September 2018
