Danfoss TR6 Thermostatic Expansion Valve
Installation Guide
Product Overview
This document provides installation guidance for the Danfoss TR6 Thermostatic Expansion Valve. It details compatibility with various refrigerants, operating parameters, and installation specifics.
Product Identification
Type: TR6
Refrigerants: R22, R407C, R410A, R32, and R454B
Max. Working Pressure: 49 bar / 711 psig
Flow Direction and Settings
The valve operates with a defined flow direction. Normal flow is from A to B, and reverse flow is from B to A.
Fixed Setting:
- Nominal flow A → B [kW/TR] = 100%
- Nominal flow B → A [kW/TR] = 80%
Adjustable Setting: Allows for adjustment of the valve's performance.
Temperature Specifications
Maximum operating temperatures vary based on refrigerant type:
- Max. 100 °C / 212 °F
- Max. 130 °C / 265 °F
- Short-lived peak 150 °C / 300 °F
Specific maximum temperatures for different refrigerant types (R22/R407C MAH, R410A MAH, R410A LAH, R32 LAH, R454B LAH) are provided, ranging from 75 °C / 167 °F to 120 °C / 248 °F.
Installation and Connections
The valve features connections with specific OD (Outer Diameter) sizes for different tube dimensions:
- OD 10-16mm [3/8-5/8in.]
- OD 18-32mm [3/4-11/4in.]
For brazing, a minimum of 5% silver content is recommended.
Torque Specification: 10 Nm / 7 ft-lb for a 19 mm / 3/4 in. connection.
Superheat Adjustment
Superheat (SH) is defined as the difference between the suction gas temperature (t2) and the evaporation temperature (ts) at the valve outlet (SH = t2 - ts).
The factory settings for Superheat (SS) are typically 4 K or 3 K, depending on the refrigerant and model specification (e.g., R22/R407C MAH, R410A MAH & LAH, R32 LAH, R454B LAH).
The table below indicates the number of turns required to adjust the superheat:
| Refrigerant | Number of turns from SS to tight spring | Number of turns from SS to loose spring |
|---|---|---|
| R22/R407C MAH | +7.25 | -4.25 |
| R410A MAH | +9.5 | -2 |
| R410A LAH | +4.75 | -4 |
| R32 LAH | +5.25 | -3.5 |
| R454B LAH | +4 | -4.25 |
Each turn of the adjustment screw corresponds to a specific temperature change in superheat:
- Δ SH / 1 turn / 360° ≈ 1.0 °C / 1.8 °F for R22/R407C MAH
- Δ SH / 1 turn / 360° ≈ 0.8 °C / 1.1 °F for R410A MAH
- Δ SH / 1 turn / 360° ≈ 1.4 °C / 2.5 °F for R410A LAH
- Δ SH / 1 turn / 360° ≈ 1.4 °C / 2.5 °F for R32 LAH
- Δ SH / 1 turn / 360° ≈ 1.3 °C / 2.3 °F for R454B LAH
Contact Information
For further information, contact Danfoss A/S, Climate Solutions. Visit danfoss.com or call +45 7488 2222.
