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Do Not Overtighten Flare Nuts on Pressure
Connection Line Fittings
Overtightening flare connections may damage the
threads on the flare nuts or flare connectors, and may
result in leaks. Do not exceed 9 ft⋅lb (12 N⋅m) of torque
when tightening brass flare connections.
Avoid Severe Pressure Pulsation at
Pressure Connections
Install pressure connection lines to pressure tap points
away from the compressor to minimize the effects of
pressure pulsation from reciprocating compressors.
IMPORTANT:
After installing the control,
evacuate pneumatic and pressure connection lines
to remove air, moisture and other contaminants in a
manner consistent with applicable environmental
regulations and standards.
Wiring
P70, P72, and P170 controls for high pressure
applications are available with several switch options
and electrical ratings. Check the label inside the
control cover for model number, switch action, and
electrical rating. See Table 1 for switch actions and
models. See Electrical Ratings.
Check the wiring terminal designations on the control
switch-block, and refer to the following guidelines and
applicable wiring diagrams when wiring the control.
!
WARNING: Risk of Electrical Shock.
Disconnect each of multiple power supplies before
making electrical connections. More than one
disconnect may be required to completely
de-energize equipment. Contact with components
carrying hazardous voltage can cause electric shock
and may result in severe personal injury or death.
IMPORTANT:
Use only the terminal screws
that are supplied with the switch-block. Using other
screws may cause damage to the switch-block and
will void the warranty.
IMPORTANT:
Use copper conductors only.
Make all wiring connections in accordance with local,
national, and regional regulations. Do not exceed the
controls.
Table 1: Pressure Control Switch Action, Low Events, High Events, Model Types, and Electrical Ratings
Tables References
P70, P72, P170 Series Controls for High Pressure Applications Installation Instructions
L1
L2
M1
Line
L1
L2
M1
Line
Open-High switch action:
opens on pressure rise.
(C and D Models)
Figure 4: Typical Wiring for SPST Switch
(P70A, B, C, D and P170A, C, D Type Models)
L1
L2
Alarm
2
1
3
1 to 3 opens, and 1 to 2 closes
on pressure rise.
Figure 5: Typical Wiring for SPDT Switch
(P70E and F Type Models)
L1
L2
Alarm
M1
Line
M2
Line
Main circuit (Line to M2) opens and auxiliary
circuit (Line to M1) closes on pressure rise.
Figure 6: Typical Wiring for 4-Wire, 2-Circuit
Switch (P70J, K and P170K Type Models)
L1
L2
*L3
M2
Line
M1
Line
Line to M1, and Line to M2 open on pressure rise.
( L3 is third supply line in 3-phase applications.)
*
Figure 7: Typical Wiring for DPST Switch
(P72C and D Type Models)
Load
Load
Load
Alarm
Circuit
Power
Load
Load
3
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