Danfoss 027R9972 Electric 3 Way Valve Installation Guide
- June 10, 2024
- Danfoss
Table of Contents
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
- Unskrew the big nut with 5 rotations
- Lift the motor with a screwdriver untill it is loose
- Unscrew the big nut fully
- The “fixing” pin must be placed in the gap
- 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
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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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