Danfoss Type KP 21 Pressure Switch Installation Guide
- June 12, 2024
- Danfoss
Table of Contents
Installation guide
Pressure switch
Type KP 21
Ambient temperatures
Caution: Do not mount a switch in a position where dirt, sediment or oil will affect the operation of the switch.
Test pressure (p test)
Enclosure
CAUTION: The mounting panel must be plane to avoid damage of switch.
Low pressure (LP) side setting
CUT-IN minus DIFFERENTIAL equals CUT-OUT
High pressure (HP) side setting
CUT-OUT minus DIFFERENTIAL equals CUT-IN
CAUTION:
Disconnect power supply before wiring connections are made or service to avoid
possible electrical shock or damage to equipment.
Do never touch live parts with your fingers or with any tool.
Contact load
Alternating current:
AC 1: 16 A, 400 V
AC 3: 16 A, 400 V
AC15: 10 A, 400 V
Max. starting current (L.R.): 112 A, 400 V
Direct current:
DC13: 12 W, 220 V control current
Function
Note!
| Load
---|---
Signal option
Bellows movement on pressure rise
Bellows movement on pressure drop
Controls with low pressure (LP) and high pressure (HP) signal
Terminal block
CAUTION: Use terminal screws furnished in the contact block.
Use tightening torque (20 lb.) in 2.3 Nm.
Use copper wire only.
Low pressure (LP) side:
A-C close on LP rise
A-C open on LP drop
High pressure (HP) side.
A-C open on HP rise
A-C close on HP drop
LP signal option:
A-B close on LP drop
HP signal option
A-D close on HP rise
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