Danfoss 027R9972 Electric 3 Way Valve Installation Guide

Danfoss 027R9972 Electric 3-Way Valve

Specifications

• Product Name: Electric 3-way valve
• Type: CTR 20
• Main Application: Heat reclaim
• Refrigerant: R744 (for other refrigerants, contact Danfoss)
• Stepper   Motor Type: Bipolar
• Phase Current: 100 mA RMS / 141 mA Peak
• Max Working Pressure: 140 Bar / 2030 psig
• Total Full   Steps: 6600
• Step Rate: 75 stp./sec.

Product Usage Instructions

Flow Direction

• Valves are delivered in approximately half-opened position and are ready for brazing.

Mounting Direction

• Ensure correct mounting direction as per Danfoss 27H401.10 guidelines.

Brazing/Welding

• Use Silver-Flo 56 (AWS B Ag-7) for brazing. For TIG welding, use a 2mm thick stainless steel alloy. Avoid filler metals containing Phosphor like BS: CP 1/ DIN L-Ag 15P or BS: CP 3/ DIN L-Ag P7.

Electrical Connections

• Connect A1 and A2 to coil I, and B1 and B2 to coil II as per Danfoss 27H435.10 and Danfoss 34G166.10 instructions.

Service

• Refer to Danfoss 27H403.10 and 27H408.10 for service instructions. Use the service kit with 3 O-rings (Code no. 027H7248).

FAQ

Q: Can the valve be connected directly to an AC/DC power source?

A: No, do not connect the valve directly to an AC/DC power source. Connect it only to an appropriate controller/driver.

Q: What should be done before operating the valve?

A: Ensure the valve is not operated while assembling or disassembling.

Q: What is the recommended torque for the valve?

A: The maximum torque recommended is 130 Nm / 95.9 ft-lbf.

Electric 3-way valve

Type CTR 20

• Main application: Heat reclaim
• Refrigerant: R744 for other refrigerants contact Danfoss
• Ambient temperature: Min. -40 °C / -40 °F
  • Max. 60 °C / 140 °F
• Fluid temperature: Min. 0 °C / 32 °F
  • Max. 150 °C / 302 °F
• Stepper motor type: Bipolar
• Max working pressure: 140 Bar / 2030 psig
• Total full steps: 6600
• Phase Current: 100 mA RMS / 141 mA Peak
• Coil resistance: 52 Ohm ±10% (25 °C)
• Step rate: 75 stp./sec.
• Note! Valves are delivered in approximately half opened position and are ready for brazing.
• Warning! Do not connect directly to the AC / DC power source.
• Connect the valve to the appropriate controller/driver only.
• Do not operate the valve while assembling or disassembling.

Flow direction

Mounting direction

• Do not disassemble the valve before brazing or welding.
• The valve must be in the middle position by brazing and welding (as it is delivered).

Brazing

• Recommendation: Solder nozzle 4 – 6 mm N (5/32 in – 15/64 in)

Materials used for brazing:

• Flus: Metallic tenacity No. 5 Powder or Braze Tec special h paste.
• Filler: Silver-Flo 55 (BS: AG 14/ DIN L-Ag55 Sn) or Silver-Flo 56 (AWS B Ag-7).
• Filler metals containing Phosphor i.e. BS: CP 1/ DIN L-Ag 15P or BS: CP 3/ DIN L-Ag P7 must not be used.

Welding

Recommendation for TIG welding

• Power approximately 60A.
• Use Shield gas charge – Argon.
• Welding material – approximately 2 mm thick stainless steel alloy.

Electrical connections

Warning

Service only

1. Unskrew the big nut with 5 rotations
2. Lift the motor with a screwdriver untill it is loose
3. Unscrew the big nut fully
4. The “fixing” pin must be placed in the gap
5. Max. torque:130 Nm/ 95.9 ft-lbf

• © Danfoss
• Climate Solutions
• 2023.07
• AN187286434604en-000202
• For more information on the product, please scan the QR code.

Documents / Resources

| Danfoss 027R9972 Electric 3 Way Valve [pdf] Installation Guide
027R9972 Electric 3 Way Valve, 027R9972, Electric 3 Way Valve, 3 Way Valve, Way Valve, Valve
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