Install Instructions
Table Of Contents
- Application
- Mounting
- Pressure Connections
- Avoid Sharp Bends in the Capillary Tube
- Allow for Slack in the Capillary Tube
- Coil and Secure Excess Capillary Tubing
- Avoid Contact between the Capillary Tubing and Sharp or Abrasive Objects
- Do Not Overtighten Flare Nuts on Pressure Connection Line Fittings
- Avoid Severe Pressure Pulsation at Pressure Connections
- Wiring
- Adjustments
- Technical Specifications
- Especificaciones Técnicas
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.
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.
Table 2: Standard P70, P72 and P170 Control Models for Low Pressure Applications
Model
Number
Switch Action Range
in. Hg to psig
(kPa)
Differential
psi (kPa)
Pressure
Connection
Maximum
Working
Pressure (MWP)
psig (kPa)
MICRO-SET Control Models (For Noncorrosive Refrigerants)
P70AB-12
36 in. Cap. with
1/4 in. Flare Nut
P170AB-12
SPST
Open-Low
12 in. Hg to
80 psig
(-41 to 551 kPa)
Minimum 5 (34)
Maximum 35 (241)
1/4 in. Male Flare
Connector
325
(2241)
All-Range Control Models (For Noncorrosive Refrigerants)
P70AB-1
1/4 in. Male Flare
Connector
P70AB-2
SPST
Open-Low
36 in. Cap. with
1/4 in. Flare Nut
P70CA-1
SPST
Open-High
Minimum 7 (48)
Maximum 50 (345)
36 in. Cap. with
1/4 in. Flare Nut
P70EA-10
SPDT
1 to 3 Open-Low
1 to 2 Close-Low
5 (34)
Fixed
1/4 in. Male Flare
Connector
P72AA-1
P72AB-1
DPST
Open-Low
36 in. Cap. with
1/4 in. Flare Nut
P170AB-2
SPST
Open-Low
P170CA-1
SPST
Open-High
20 in. Hg to
100 psig
(-68 to 690 kPa)
Minimum 7 (48)
Maximum 50 (345)
1/4 in. Male Flare
Connector
325
(2241)
All-Range Control Models (Ammonia Compatible)
P70AA-5
SPST
Open-Low
P70CA-4
SPST
Open-High
20 in. Hg to
100 psig
(-68 to 690 kPa)
Minimum 7 (48)
Maximum 50 (345)
1/4 in. SS Female
NPT
325
(2241)
Low Pressure Control Models for High Pressure Non-Corrosive Refrigerants
Model
Number
Switch Action
Range psi
(kPa)
Differential psi
(kPa)
Pressure
Connection
Maximum
Working
Pressure (MWP)
psig (kPa)
P70AA-2
36 in. Capillary with
1/4 in. Flare Nut
P170AA-2
SPST
Opens-Low
0 to 150 psig
(0 to 1034 kPa)
Adjustable
10 to 70
(69 to 483)
1/4 in. Male Flare
Connector
325
(2241)
6 P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions