Johnson Controls P77 Guia De Inicio Rapido página 2

2
Note
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.
Note
To facilitate order handling special ordering
codes have been added to some commonly
used models
Type number matrix
P77AAA Automatic reset
P77BCA Open low - manual reset
P77BEA Open high - manual reset
P77AAW HP or LP Limit (Auto. Reset)
conforming to DIN 32733
HP conforming to PED 97/23CE
P77BEB HP Limit (Man. Reset) conforming
to DIN 32733, PED 97/23CE
P77BES HP Safety Limit (Man. Reset)
conforming to DIN 32733,
PED 97/23CE
P77BCB LP Limit (manual reset) conforming
to DIN 32733
Mounting
Mounting can easily be done with mounting
bracket 271-51L (order separately) or directly
on a surface. Mounting holes 4,5 mm diam. and
M4 holes are provided.
Adjustment
Adjustment of range and differential can be done
by turning the hexagonal range screw and
differential screw. Manual reset models have a
range screw only. The adjustment screw can
also be locked by a lock plate accessory
(KIT023N600). The lock plate is only included
with those devices which are conform to DIN
32733.
On all models the scale indicates the high switch
point (Except type P77BCA,P77BCB, here the
scale indicates the low (cut-out) switch point).
The low switch point can be derived by
deducting the differential value from the high
switch point.
Catalogue Section 6
All manuals and user guides at all-guides.com
Contact functions
(see also "Type Number Selection" table)
Line ~
Line ~
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Optional construction note
If your requirements are not in the type number
selection table, then please contact your
Johnson Controls representative.
Repair and replacement
Repair is not possible. In case of an improperly
functioning control, please check with your
nearest supplier. When contacting the supplier
for a replacement you should state the
type/model number of the control. This number
can be found on the data plate or cover label.
Issue 13/05/2003
C
A
B
max. 20 A
A - C open on pressure decrease
Fig. 1
A
max. 20 A
A - B open on pressure increase
Fig. 2
A
max. 20 A
A - C open on pressure increase
Fig. 3
© 2003 Johnson Controls Inc
Order No. PD-P77-E
P77
M
C
B
M
B
C
M