Johnson Controls P70 Serie Instrucciones De Instalación página 3

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.
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 low 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. Also see Electrical Ratings.
Check the wiring terminal designations on the control
switch-block, and refer to the following guidelines and
applicable wiring diagram when wiring the control.
!
WARNING: Risk of Electric Shock.
Disconnect each of the 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 copper conductors only.
Make all wiring connections in accordance with local,
national, and regional regulations. Do not exceed the
control's electrical ratings.
P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions
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.
L1
L2
M1
Line
Open-Low switch action:
opens on pressure drop.
L1
L2
M1
Line
Open-High switch action:
opens on pressure rise.
Figure 4: Typical Wiring for SPST Open-Low
Switch and Open-High Switch
(P70A, B, C, D and P170A, C, D Type Models)
L1
L2
Alarm
2
3
1
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 (P70G and H Type Models)
L1
L2
L3*
M2
Line
M1
Line
Line to M1 and Line to M2 open on pressure drop.
( L3 is third supply line in 3-phase applications.) *
Figure 7: Typical Wiring for DPST Switch
(P72A and B Type Models)
Load
(A and B Models)
Load
(C and D Models)
Load
Alarm
Circuit
Power
Load
Load
3