Pressure Connections - Johnson Controls Penn P70 Series Product/Technical Bulletin

M
ounting
Mount the control in an accessible position, where the
control and pressure connection lines will not be
subject to damage.
!
CAUTION: Equipment Damage Hazard.
Mount the pressure control
upright and level. Position the
pressure connection lines to
allow drainage away from control
bellows. Pressure tap points
must be located on the top side
of the refrigerant lines. This
reduces the possibility of oil,
liquids, or sediment accumulating
in the bellows, which could cause
control malfunction.
Controls with NEMA 1 enclosures may be mounted on
flat, horizontal, or vertical surfaces. (See Figure 4.)
Use two screws or bolts through the two outer holes
on the back of the control case when mounting control
directly to a flat vertical surface.
Use the two inner holes with the Universal Mounting
Bracket (and screws supplied) when mounting the
control to a flat horizontal surface.
IMPORTANT: Use only the mounting screws
provided with the Universal
Mounting Bracket to avoid
damaging internal components.
Do not warp control case when
mounting control to uneven
surface.
Controls with NEMA 3R enclosures are designed to be
mounted in a level, upright position with the bellows
and conduit connection facing down. All gaskets must
be in place. Mounting NEMA 3R enclosures in any
position other than upright and level may trap water in
the enclosure and submerge internal control
components.
4 P—P70, P72, and P170 Controls for Dual Pressure Applications Product/Technical Bulletin
Use mounting screws
provided. Longer screws
may damage control.
Mount bracket to
horizontal surface.
Figure 4: Mounting Dual Pressure Controls with
NEMA 1 Enclosures
P
ressure Connections
P70, P72, and P170 dual pressure controls are
connected to the controlled equipment by a capillary or
flexible hose (except ammonia compatible models).
These controls are available with a variety of pressure
connection styles. See Figure 13 for pressure
connection styles.
Follow these guidelines when installing pressure
connection lines.
IMPORTANT: If these controls are installed on
equipment that contain
hazardous or regulated
materials, such as refrigerants or
lubricants, the installer and user
should observe all regulations
governing the handling and
containment of those materials.
Avoid Sharp Bends in the Capillary Tube
Sharp bends can weaken or kink capillary tubes, which
may result in leaks or restrictions.
Allow for Slack in the Capillary Tube
Leaving a little slack in the capillary tube helps
dampen mechanical vibration that can weaken or
damage capillary tubes.
Coil and Secure Excess Capillary Tube
Carefully loop any excess capillary tube into smooth,
circular coils (approximately 3 in. diameter). Securely
fasten the coiled tubing.
Mounting Holes for
Flat Vertical Surfaces
Universal Mounting
Bracket
(Part No. 271-51)