Pressure Connections - Johnson Controls P70 Serie Manual Del Usuario

4-1/16
5/8 104
15/16
24
2-11/16
68
25
1-1/4
31
1-5/8
41
Figure 2: Dimensions for P70, P72, and P170
Pressure Controls with NEMA 3R Enclosures,
in. (mm)
Mounting
Mount the control in an accessible position, where the
control and pressure connection are not subject to
damage.
Mount the pressure control upright and level. Position
the pressure connection line to allow drainage away
from control bellows. Locate pressure tap points on the
top side 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 NEMA 1 enclosures on horizontal
or vertical flat surfaces.
Use two screws or bolts through the two outer holes
on the back of the control case to mount the 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. See Figure 3.
Mount controls with NEMA 3R enclosures in a level,
upright position with the bellows and conduit
connection facing down. Ensure that all gaskets are 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.
IMPORTANT: Use only the mounting screws
supplied with the Universal Mounting Bracket 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 will void the warranty.
2 P70, P72 and P170 Series Controls for High Pressure Applications Installation Instructions
5/8
16 79
4-1/16
104
5/8
16
1/2
12
70
3/8
2-15/16
10
74
3/16
4 Mounting Holes
5
5/16
Diameter
8
3/4 in. NPSM
Rigid Conduit
Hole
1-9/16
40
1/2
13
Use mounting screws
provided. Longer screws
may damage control.
Mount bracket to
horizontal surface.
Figure 3: Mounting the P70, P72, and P170
Pressure Controls with NEMA 1 Enclosures,
in. (mm)

Pressure Connections

P70, P72, and P170 high pressure controls are
connected to the controlled equipment by a capillary
(except ammonia models). These controls are
available with a variety of pressure connection styles.
Follow these guidelines when installing pressure
connection lines:
IMPORTANT: If these controls are installed on
equipment that contains hazardous or regulated
materials, such as refrigerants or lubricants, you
must comply with all standards and regulations
governing the containment and handling 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 Tubing
Carefully loop any excess capillary tubing into smooth,
circular coils (approximately 2 to 3 in.[50 to 75 mm]
diameter). Securely fasten the coiled tubing.
Avoid Contact between the Capillary Tubing and
Sharp or Abrasive Objects
Vibration of sharp or abrasive objects in contact with
capillary tubes can result in leaks.
Mounting Holes for
Flat Vertical Surfaces
Universal Mounting
Bracket
(Part No. 271-51)