P78 Series Controls for Dual Pressure and Hazardous Location Applications Installation Guide
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Repair information
If the P78 Series Pressure Control fails to operate within its specifications, replace the unit. For a replacement P78
control, contact the nearest Johnson Controls/Penn distributor or representative.
Installation
Always install P78 controls in refrigeration systems that comply with European Ex installation standard, EN 60079-
11, any local directive and legislation, and any other regulation applicable.
Dimensions
See Figure 1 for control dimensions. These dimensions are nominal and subject to accepted manufacturing
tolerances and application variables.
Mounting
IMPORTANT: Components within the P78 control can exceed the enclosure temperature by 1°C (2.1°F). For
standard applications, limit the maximum media temperature on the control to 80°C (176°F). When the media
temperature exceeds 80°C (176°F), you must ensure that the media temperature does not cause a thermal
ignition risk on parts between the media and the enclosure.
Risk of Property Damage.
Mount the P78 Dual Pressure Control according to the instructions and guidelines included with the control. These
instructions and guidelines are intended to reduce the risk of malfunction of the control and resulting property
damage. Failure to follow these instructions and guidelines could cause the control to malfunction, resulting in
property damage.
Risque de dégâts matériels.
Montez le contrôle P78 selon les instructions et directives fournies avec le contrôle. Ces instructions et directives
sont destinées à réduire les risques de mauvais fonctionnement du contrôle et de dégâts matériels. Le non-
respect de ces instructions et directives pourrait provoquer un dysfonctionnement du contrôle et causer des
dégâts matériels.
Figure 1: P78 Dual Pressure Control with IP54 (Type 1 NEMA) enclosure dimensions, mm (in.)
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