Pressure Connections - Johnson Controls P70 Serie Instrucciones De Instalación

4-1/16
104
3/8
7/16 10
2-11/16
11
68
25
1-1/4
31
1-5/8
41
Figure 2: Dimensions of P70, P72, and P170
Pressure Controls with NEMA 3R Enclosures,
in. (mm)
Note: These dimensions are nominal and are
subject to accepted manufacturing tolerances and
application variables.
Mounting
Mount the control in an accessible position, where the
control and pressure-connection line are not subject to
damage.
Mount the pressure control upright and level. Position
the pressure-connection line 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 pressure connection or control
bellows, which could cause control malfunction.
Controls with NEMA 1 enclosures may be mounted on
horizontal or vertical flat surfaces.
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 with screws supplied when mounting the
control to a flat horizontal surface. See Figure 3.
Controls with NEMA 3R enclosures are designed to be
mounted in a level, upright position with the sensing
element 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.
2 P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions
5/8
16 79
4-1/16
104
5/8
16
1/2
12
70
2-15/16
74
4 Mounting Holes
5/16
Diameter
8
3/4-NPSM
Rigid Conduit
1-9/16
Hole
40
1/2
13
IMPORTANT:
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.
Use mounting screws
provided. Longer screws
may damage control.
3/16
5
Mount bracket to
horizontal surface.
Figure 3: Mounting the P70, P72, and P170 Low
Pressure Controls with NEMA 1 Enclosures

Pressure Connections

P70, P72, and P170 low pressure controls are
connected to the controlled equipment by a capillary or
flexible hose (except ammonia models). Controls are
available with a variety of pressure-connection styles.
Follow these guidelines when installing
pressure-connection lines:
IMPORTANT:
equipment that contain 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.
Use only the mounting screws
Mounting Holes for
Flat Vertical Surfaces
Universal Mounting
Bracket
(Part Number 271-51)
If these controls are installed on