Danfoss CTR 20 Installation guide
ENGINEERING
TO M O R R OW
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Installation guide
Electric 3-way valve
Type CTR 20
Main application: |
Refrigerant: R744 |
Ambient temperature: |
Fluid temperature: |
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Heat reclaim |
for other refrigerants |
Min. -40 °C / -40 °F |
Min. 0 °C / 32 °F |
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contact Danfoss |
Max. 60 °C / 140 °F |
Max. 150 °C / 302 °F |
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Stepper motor type: |
Max working pressure: |
Total full steps: |
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Bipolar |
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140 Bar / 2030 psig |
6600 |
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Phase Current: |
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Coil resistance: |
Step rate: |
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100 mA RMS / 141 mA Peak |
52 Ohm ±10% (25 °C) |
75 stp./sec. |
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Note! |
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Warning! |
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Valves are delivered in approximately half |
Do not connect directly to AC / DC power source. |
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opened position and is ready for brazing. |
Connect valve to appropriate controller/driver only. |
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Do not operate valve while assembling or |
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disassembling. |
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Flow direction |
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A. |
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B. |
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1 in 2 outs |
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2 in 1 out |
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Common |
Common |
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<![if ! IE]> <![endif]>UK customers only:Danfoss Ltd. Oxford |
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For more information on the product, |
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please scan the QR code. |
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<![if ! IE]> <![endif]>for |
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<![if ! IE]> <![endif]>Info |
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© Danfoss | DCS (sw) | 2021.01 |
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AN187286434604en-000201 |
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Mounting direction
Brazing
3
Material for brazing
N2 
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2 
1
1 |
2 |
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• Do not disassemble the valve |
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before brazing or welding. |
• the valve must be in middle position |
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by brazing and welding (as it is |
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delivered). |
3a Welding |
3b |
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max.
75 °C /
167 °F max.
700 °C /
1300 °F
Recommendation: Solder nozzle 4 - 6 mm N (5/32 in - 15/64 in) Materials used for brazing:
•Flus: Metalli 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.
max. 75 °C / 167 °F
Recommendation for TIG welding
•Power approximately 60A.
•Use Shield gas charge - Argon.
•Material for welding - approximately 2 mm thick stainless steel alloy.
© Danfoss | DCS (sw) | 2021.01 |
AN187286434604en-000201 |
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