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D
escription
The pre-set snap-acting disc utilised in the
P100 series reverses its shape when
pressurised to a selected actuation pressure
setting. When the disc snaps, its drives a set
of electrical contacts open or close. When the
pressure falls to the de-actuation pressure
setting, the snap-acting disc and electrical
contacts reset to their pre-set position.
Note: For manual reset models the electrical
contacts have to be reset manually.
Automatic reset models
Standard automatic reset models are provided
with SPST contacts for either "Open High" or
"Open Low" function.
Special heavy-duty automatic reset models are
available for "Open High" or "Open Low"
function and are provided either with heavy-
duty SPST contacts or with heavy-duty SPDT
contacts.
Manual reset models
These models are available with standard duty
"Open High" SPST contacts.
The latching mechanism in the P100 manual
reset models provides electrical cut-out even
when the reset button is held fully depressed.
This trip-free design allows restarting the
compressor only when the line pressure has
returned to the pre-determined level.
A
utomatic reset models pressure range differentials and tolerances
(A)
Actuation
Standard
pressure
tolerance*
range*
psig
bar **
0 to 50
0 to 3,4
51 to 120
3,5 to 8,3
121 to250
8,3 to 17,2
251 to 350
17,3 to 24,1
351 to 500
24,2 to 34,5
501 to 750
34,6 to 52
*
At room ambient temperature.
**
Values are rounded.
***
Do not use smaller differentials or smaller tolerances as necessary for the application (price consequences)
Catalogue Section 6
(B)
(C)
Minimum
tolerance*
psi
psi
bar **
bar**
± 5
± 4
± 0,3
± 0,3
± 8
± 5
± 0,6
± 0,3
± 10
± 7
± 0,7
± 0,5
± 15
± 10
± 1
± 0,7
± 20
± 10
± 1,4
± 0,7
± 25
± 15
± 1,7
± 1
N
ote
The controls are intended to control
equipment under normal operating
conditions. Where failure or
malfunctioning of the controls could lead
to an abnormal operating condition that
could cause personal injury or damage to
the equipment or other property, other
devices (limit or safety controls) or
systems (alarm or supervisory systems)
intended to warn of or protect against
failure or malfunctioning of the controls
must be incorporated into and maintained
as part of the control system.
A
djustment
These controls are factory set on customers'
requirements and are not field adjustable.
The trip-points can be selected from here after
listed tables.
Note: Manual reset models can only be
selected on high trip-point.
Optimum
differential band*
% of Actuation
40-65
50-75
60-75
60-75
65-80
70-80
Issue 08/07/2003
Minimum
Maximum
Release
Release
Pressure***
Pressure***
% of Actuation
% of Actuation
30
40
50
55
60
65
© 2003 Johnson Controls, Inc
Order No. PD-P100-E
P100
70
80
80
80
85
85
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