P78 Series Controls for Dual Pressure and Hazardous Location Applications Installation Guide
3
Guidelines: Observe the following guidelines to mount the P78 dual pressure control:
• Mount the control in an accessible position, where the control and pressure-connection lines are not subject to
damage.
• Mount the pressure control upright an
d level.
•
Position the pressure-connection lines to allow drainage away from the control be
llows.
•
Locate pressure-tap points on the topside of the refrigerant lines to reduce the possibility of oil, liquids,
or
sediment
accumulating in the bellows, which could cause control malfunction.
• Mount controls with IP54 (Type 1 NEMA) enclosures on horizontal or vertical flat surfaces.
Vertical Surface: Use four M4 x 6 mm + d screws (Callout 1) through the inner M4 holes (Callout 2) on the back of
the control case when mounting directly to a flat vertical surface (Callout 3). Do not use screws longer than
6 mm + d, where d refers to thickness of mounting surface. See Figure 2.
IMPORTANT: When you mount the control to a flat horizontal surface, use the screws provided and a universal
mounting bracket (sold separately) to avoid damaging internal components. Be careful not to distort or bend the
control case when mounting the control to an uneven surface. Using other screws or bending the control case
voids the warranty.
Callout Description
1 Four field supplied mounting screws for vertical surface, M4 x 4 mm + d. Do not use screws longer than 6
mm + d.
2 Four inner mounting M4 holes
3 Flat vertical mounting surface
Figure 2: Mounting the P78 Dual Pressure Control on a vertical surface
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