Johnson Controls P70 Serie Instrucciones De Instalación página 6

Manual Reset Operation
Pressure controls with the Manual Reset option lock
out when they reach Cutout pressure and must be
manually reset by the user to restart the controlled
equipment. The manual reset mechanism is trip-free
and cannot be overridden by blocking or tying the
reset button down.
Table 2: Standard P70, P72 and P170 Control Models for Low Pressure Applications
Model Switch Action
Number
P70AB-12 SPST
Open-Low
P170AB-12
P70AB-1 SPST
Open-Low
P70AB-2
P70CA-1 SPST
Open-High
P70EA-10 SPDT
1 to 3 Open-Low
1 to 2 Close-Low
P72AA-1 DPST
Open-Low
P72AB-1
P170AB-2 SPST
Open-Low
P170CA-1 SPST
Open-High
P70AA-5 SPST
Open-Low
P70CA-4 SPST
Open-High
Low Pressure Control Models for High Pressure Non-Corrosive Refrigerants
Model Switch Action
Number
P70AA-2 SPST
Opens-Low
P170AA-2
6 P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions
Range
in. Hg to psig
(kPa)
MICRO-SET Control Models (For Noncorrosive Refrigerants)
12 in. Hg to
80 psig
(-41 to 551 kPa)
All-Range Control Models (For Noncorrosive Refrigerants)
20 in. Hg to
100 psig
(-68 to 690 kPa)
All-Range Control Models (Ammonia Compatible)
20 in. Hg to
100 psig
(-68 to 690 kPa)
Range psi
(kPa)
0 to 150 psig
(0 to 1034 kPa)
n equipment with locked out controls, first determine
and remedy the cause of the lockout, and allow the
sensed pressure to return to the Cut In setpoint. Then,
press and release the reset button on the front of the
control to restore operation of the controlled
equipment.
Differential Pressure
psi (kPa) Connection
Minimum 5 (34) 36 in. Cap. with
Maximum 35 (241) 1/4 in. Flare Nut
1/4 in. Male Flare
Minimum 7 (48) 1/4 in. Male Flare
Maximum 50 (345) Connector
36 in. Cap. with
1/4 in. Flare Nut
36 in. Cap. with
1/4 in. Flare Nut
5 (34) 1/4 in. Male Flare
Fixed Connector
Minimum 7 (48) 36 in. Cap. with
Maximum 50 (345) 1/4 in. Flare Nut
1/4 in. Male Flare
Connector
Minimum 7 (48) 1/4 in. SS Female
Maximum 50 (345) NPT
Differential psi Pressure
Connection
(kPa)
Adjustable 36 in. Capillary with
1/4 in. Flare Nut
10 to 70
1/4 in. Male Flare
(69 to 483)
Connector
Maximum
Working
Pressure (MWP)
psig (kPa)
(2241)
Connector
(2241)
325
(2241)
Maximum
Working
Pressure (MWP)
psig (kPa)
325
(2241)
325
325