Solenoid expansion valve Castel 2028E/M10S03
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Specification
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VAT:23,00%
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Symbol:2028E/M10S03
Product Description
Castel electronic expansion valve 2028E/M10S03 for R744 (CO8322;) – ODS 10 × 12 mm, orifice 03
Castel 2028E/M10S03 is an electronic expansion valve from the 2028E series, designed for subcritical refrigeration systems using R744 (CO8322;). It operates in PWM mode (pulse-width modulation), features soldered ODS 10 mm (inlet) and 12 mm (outlet) connections, and a type 03 orifice with a nominal capacity of 5.40 kW. The valve is supplied without a coil (suffix S).
Features, advantages and benefits
- PWM control, minimum opening time 1 s: the valve doses the refrigerant in pulses → flow rate is adjusted to the current evaporator demand → more stable system operation.
- Design for R744: the valve was developed for subcritical systems operating with R744 (fluid group 2 according to Directive 2014/68/EU) → compatibility with CO8322; system requirements → safe selection of associated components.
- Interchangeable orifices: the valve is supplied with an installed orifice, and orifices can be replaced even after the valve has been soldered in place → capacity can be changed without removing the valve from the installation → shorter service time.
- EPDM outlet seals: the main components are made from the same materials as the 2028 series, except for the outlet seals made of ethylene-propylene rubber (EPDM) → material used by the manufacturer for the 2028E series → consistency with R744 operating requirements.
- ODS 10 mm / 12 mm connections: soldered pipe connections, inlet Ø10 mm, outlet Ø12 mm → tight connection to the installation → simple installation without adapters for pipes of these diameters.
- Wide temperature range: TS from -50°C to +100°C, ambient temperature from -40°C to +50°C → suitability for different operating conditions → application flexibility.
Technical data
| Parameter | Value |
|---|---|
| Product code | 2028E/M10S03 |
| Refrigerant | R744 (subcritical systems) |
| Operating principle | PWM (Pulse Width Modulating) |
| Connection type | ODS |
| Inlet connection (IN) Ø [mm] | 10 |
| Outlet connection (OUT) Ø [mm] | 12 |
| Orifice (Orifice) | 03 |
| Orifice diameter [mm] | 0.8 |
| Nominal capacity of orifice 03 (R744) [kW] | 5.40 |
| Kv [m³/h] | 0.023 |
| Minimum opening pressure differential (MinOPD) [bar] | 0 |
| Maximum opening pressure differential (MOPD) [bar] | 37 (coils 9320 AC and 9320 DC) |
| Minimum operating time [s] | 1 |
| PS [bar] | 90 |
| MWP [psi] (according to UL approval) | 1305 |
| TS min. [°C] | -50 |
| TS max. [°C] | +100 |
| TA min. [°C] | -40 |
| TA max. [°C] | +50 |
| Risk category according to PED Recast | Art. 4.3 |
| Version | without coil (suffix S) |
Nominal performance refers to: evaporation temperature -25°C, condensation temperature 0°C and liquid temperature before the valve -4°C.
Capacity of orifice 03 for R744 [kW]
| Evaporation temperature [°C] | Δp across the valve 10 bar | Δp across the valve 20 bar |
|---|---|---|
| +5 | 3.48 | 3.88 |
| 0 | 3.70 | 4.12 |
| -10 | 4.14 | 4.61 |
| -20 | 4.44 | 5.24 |
| -30 | 4.80 | 5.54 |
| -40 | 5.17 | 5.81 |
| -50 | 5.44 | 5.99 |
Values from the manufacturer’s table (Table 39A) for liquid subcooling before the valve of 4 K. For different subcooling, divide the evaporator capacity by the correction factor Fsub from the manufacturer’s table (Table 39B).
Orifice sizing and replacement
The 2028E series is supplied with orifices in ten sizes, from 00 to 09. The last two digits in the catalogue number indicate the type of orifice fitted at the factory – in model 2028E/M10S03 this is orifice 03. The orifice is selected based on the pressure differential across the valve, evaporation temperature and required evaporator capacity, which should be equal to or slightly lower than the valve capacity. To replace the orifice, order the appropriate spare parts kit; for orifice 03 it is part number 9150E/R65.
FAQ – frequently asked questions
- What refrigerant is the Castel 2028E/M10S03 valve designed for?
- It is intended for subcritical systems using R744 (CO8322;). The manufacturer states that valves from this series cannot be used with other refrigerants.
- Is this an electronic valve and is it sold with a coil?
- Yes, it is an electronic expansion valve operating in PWM mode. 2028E series valves are sold exclusively without a coil (suffix S), so the coil must be ordered separately.
- What connections does the 2028E/M10S03 valve have?
- It has soldered ODS connections: inlet Ø10 mm, outlet Ø12 mm.
- What capacity does the orifice 03 have?
- The nominal capacity of orifice 03 for R744 is 5.40 kW (at evaporating temperature -25°C, condensing temperature 0°C and liquid temperature before the valve -4°C). Kv is 0.023 m³/h.
- What pressure and temperature ranges does the valve allow?
- PS is 90 bar (MWP 1305 psi according to UL approval). Temperature TS ranges from -50°C to +100°C, and ambient temperature TA from -40°C to +50°C.
- Can the orifice be changed without cutting out the valve?
- Yes. According to the manufacturer, the orifices are interchangeable and can be installed even after the valve has been soldered in. For orifice 03, the spare parts kit is 9150E/R65.
- What is the maximum opening pressure differential (MOPD)?
- MOPD is 37 bar for coils 9320 AC and 9320 DC, while the minimum opening pressure differential is 0 bar.