Data sheet
Valves for Control of Fan Coils and Terminal Units
RA HC
Description
RA HC |
RA HC |
TWA-A |
without test plugs |
with test plugs |
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The RA HC is a control valve applied together with Danfoss self-acting or Danfoss electronic controls in fan coil units and similar terminal units in any HVAC system. When installed with Danfoss ASV, balancing and control functions are combined representing the complete dynamic hydraulic solution.
Combined with Danfoss thermo actuators (TWA) the RA HC valves provide On/Off control, control the flow over the terminal unit and maintain optimum temperatures based on room load requirements.
RA HC valves have eight presettings, thus the correct quantity of water flow is ensured for each circuit.
RA HC matches high flow capacities and with its compact design only little installation space is required.
The RA HC with TWA and ASV provide:
•Balancing and control function
•High flow capacity
•Compact design, requires small installation space
•Easy presetting, no tools required
•Measuring on ASV partner valve or optional on RA HC
•Shut-off (for isolation during system maintenance) using manual shut off knob.
Ordering and Specification |
RA HC valve |
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Type |
Connection |
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Test |
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Max working pressure |
Max diff. Pressure with TWA-A |
Medium Temp |
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Code No. |
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(“) |
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plugs |
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bar |
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(°C) |
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DN 15 |
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G 1/2 |
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yes |
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16 |
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1.8 |
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−10 … 100 |
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003Z3931 |
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DN 20 |
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G 3/4 |
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yes |
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16 |
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1.8 |
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−10 … 100 |
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003Z3910 |
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DN 25 |
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G 1 |
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yes |
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16 |
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1.8 |
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−10 … 100 |
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003Z3911 |
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DN 15 |
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G 1/2 |
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no |
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16 |
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1.8 |
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−10 … 100 |
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003Z3932 |
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DN 20 |
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G 3/4 |
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no |
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16 |
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1.8 |
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−10 … 100 |
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003Z3920 |
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DN 25 |
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G 1 |
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no |
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16 |
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1.8 |
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−10 … 100 |
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003Z3921 |
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The max. differential pressure specified is the maximum pressure at which the valves give satisfactory regulation. As with any device |
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which imposes a pressure drop on the system, noise may occur under certain flow/pressure conditions. |
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RA HC accessories |
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Type |
Connection |
Supply |
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Code No. |
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type |
Voltage |
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TWA-A NC |
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24 V |
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088H3110 |
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TWA-A NO |
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RA |
AC/DC |
088H3111 |
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TWA-A NC |
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230 V |
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088H3112 |
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TWA-A NO |
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AC |
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088H3113 |
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Manual shut off knob |
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- |
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013G3300 |
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Valve |
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Presettings, kv values 1) |
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kVS |
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1 |
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1.5 |
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2 |
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2.5 |
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3 |
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3.5 |
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4 |
4.5 |
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5 |
5.5 |
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6 |
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6.5 |
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7 |
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N |
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DN 15 |
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0.11 |
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0.16 |
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0.22 |
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0.28 |
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0.41 |
0.62 |
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0.82 |
1.0 |
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1.2 |
1.3 |
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1.5 |
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1.7 |
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2.0 |
2.8 |
2.8 |
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DN 20 |
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0.29 |
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0.34 |
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0.43 |
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0.68 |
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0.88 |
1.1 |
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1.3 |
1.4 |
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1.7 |
2.2 |
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2.8 |
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3.1 |
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3.3 |
4.3 |
4.3 |
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DN 25 |
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0.35 |
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0.41 |
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0.58 |
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0.79 |
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1.0 |
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1.3 |
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1.5 |
1.7 |
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2.2 |
2.9 |
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3.7 |
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3.9 |
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4.0 |
5.5 |
5.5 |
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1) The kv-values show the flow (Q) in m3/h at a differential pressure (∆p) of 1 bar through the valve.
© Danfoss | 2020.02 |
AI175386404642en-000502 | 1 |
Data sheet |
RA HC Valves for Control of Fan Coils and Terminal Units |
System and Flow
Verification
For RA HC without test plugs, it is recommended to |
For detailed information on: |
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do measuring and flow verification with Danfoss PFM |
• ASV-PV data sheet |
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5001 or Danfoss flow indicator on the ASV-PV partner |
• PFM 5001 data sheet |
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valve. |
• Flow indicator data sheet |
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For ASV-PV < DN 50 the recommended partner |
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valve is ASV-I or ASV-BD. For ASV-PV > DN 50 the |
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recommended partner valve is MSV-F2. |
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For RA HC with test plugs, it is accepted to do |
For detailed information on: |
measuring and flow verification with Danfoss PFM |
• ASV-PV data sheet |
5001 or Danfoss flow indicator on the RA HC valve |
• PFM 5001 data sheet |
directly. |
• Flow indicator data sheet |
For ASV-PV < DN 50 the recommended partner valve |
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is ASV-M or ASV-BD. |
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For ASV-PV > DN 50 the recommended partner valve |
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is MSV-F2. |
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Design
1.Gland seal
2.Protection cap
3.Valve head
4.Test plugs
5.Sealing pad
6.Valve body
Materials in contact with flow medium 1)
Valve body and other metal parts |
DZR |
Cone |
DZR |
O-rings |
EPDM |
Sealing pad |
NBR |
kv-setting ring |
Ryton PPS |
1)Flow medium: water and water mixtures with secondary coolants like glycols (regarding suitability and usage especially in not oxygen tight systems please see the instructions given by the coolant producer) .
2 | AI175386404642en-000502 |
© Danfoss | 2020.02 |
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