Danfoss Pressure Switch Installation Guide
Type KPI 34, KPI 35, KPI 36 and KPI 38
Product Overview
This document provides installation instructions for Danfoss pressure switches, specifically models KPI 34, KPI 35, KPI 36, and KPI 38.
Technical Specifications:
- Operating Temperature Range: -40 °C to 65 °C (for t₁), -40 °C to 100 °C (for t₂)
- Maximum Pressure Ratings: KPI 34: 18 bar, KPI 35: 18 bar, KPI 36: 18 bar, KPI 38: 30 bar
Dimensions (approximate):
- Height: 61 mm
- Width: 84 mm
- Depth: 44 mm
- Connection Size: G 1/4 A
Model Specifications:
| Type | Range | Diff. |
|---|---|---|
| KPI 34 | -0.2 - 3 bar | 0.5 - 1.25 bar |
| KPI 35 | -0.2 - 8 bar | 0.4 - 2 bar |
| KPI 36 | 4 - 12 bar | 0.5 - 1.6 bar |
| KPI 38 | 8 - 28 bar | 1.8 - 6 bar |
Note: Scale in KP units is indicative only. For accurate setting or when using according to FM approval, use an additional pressure gauge to set the unit.
Installation and Wiring
General Precautions:
- CAUTION: Disconnect power supply before wiring connections are made or service to avoid possible electrical shock or damage to equipment. Never touch live parts with your fingers or with any tool.
Wiring Diagram Description:
The pressure switch has terminals labeled '1', '2', and '4'. Terminal '1' is typically the common terminal. Terminals '2' and '4' are for the changeover contacts (stop/start functions).
Standard Contact Specifications:
| Voltage | FL load (A) | LR duty (A) | Resist. load (A) | Pilot duty (A) | Type |
|---|---|---|---|---|---|
| AC-1: 10 A, 440 V | 240 | 6 | 36 | 8 A | AC |
| AC-3: 6 A, 440 V | 3 A | ||||
| AC-15: 4 A, 440 V | 120 | 8 | 48 | 10 A | DC |
| Blocked rotor: 112 A | 240 | 12 W | |||
| Direct current: DC-13, 12 W, 220 V |
Tightening Torque: 20 lb. in. for connections. Use copper wire only.
Certifications: The product is UL Listed for refrigeration controller 61B5.
Maintenance
Please note: No maintenance is required for the switches after final installation.
Contact Information
For UK customers only: Danfoss Ltd., 22 Wycombe End, HP9 1NB, GB.
Importer: Danfoss LLC, 04080, Kyiv, P.O. Box 168, Ukraine.
