Castel DF 316/M10S filter drier — soldered Ø10 mm

Castel DF316/M10S is a hermetic filter drier with a Solid Core, designed to protect refrigeration systems from moisture, acids and solid contaminants. ODS solder connections with a 10 mm diameter and a maximum working pressure of 50 bar provide versatile use in commercial and industrial installations — from display coolers to compressor racks.

Benefits and key features

• Solid Core — complete filtration: A homogeneous core structure absorbs moisture and traps solid particles throughout the volume, eliminating the risk of filling leakage — the compressor and EXV valves operate without contamination risk.
• Nominal capacity 250 cm³ — effective protection: The large desiccant bed volume allows long-term operation without frequent replacement — lower maintenance costs.
• PS 50 bar — compatible with modern refrigerants: High pressure resistance (680 psi according to UL) ensures compliance with systems using R410A, R448A, R449A and other high-pressure HFO/HFC refrigerants.
• ODS solder connection Ø10 mm — leak-tight for years: A durable solder joint eliminates leaks at threaded fittings — reliability confirmed by PED 2014/68/EU and STD 207 standards.
• Wide refrigerant compatibility — one product for many applications: Supports HCFC, HFC, HFO, HFO+HFC and HC (propane R290, isobutane R600a), simplifying storage and service logistics.
• Operating temperature range from −40°C to +150°C — for extreme conditions: Suitable for both low-temperature freezer cabinets and air conditioning installations.

Technical data

Parameter	Value
Product code	DF316/M10S
Core type	Solid Core
ODS connection diameter	Ø 10 mm
Connection type	Soldered (ODS)
Nominal capacity	250 cm³
Maximum working pressure PS	50 bar
MWP (UL)	680 psi
Operating temperature range TS	−40°C … +150°C

Compatible refrigerants

The DF316/M10S filter drier is compatible with refrigerants classified as A1, A2L and A3 according to ASHRAE 34-2019:

Certificates and standards

• PED Directive 2014/68/EU (Pressure Equipment Directive)
• UK PE(S)R 2016
• STD 207 (industry standard for refrigeration filters)
• REACH Regulation 1907/2006/EC
• BPR Regulation 528/2012/EU
• RoHS Directive 2011/65/EU & 2015/863/EU

FAQ — Most common questions

Which refrigerants are compatible with Castel DF316/M10S?

The filter is compatible with a wide range of refrigerants: HCFC (R22), HFC (R134a, R404A, R407C, R410A, R507), HFO (R1234ze), HFO+HFC blends (including R448A, R449A, R513A) and hydrocarbon HC refrigerants (R290, R600a). It meets the A1, A2L and A3 classifications of ASHRAE 34-2019.

How does Solid Core differ from loose fill filters?

The Solid Core is a monolithic desiccant block that does not leak or fragment under vibration or hydraulic shock. Unlike bag-type filters, it eliminates the risk of fine desiccant particles entering the system and damaging the compressor or expansion valves.

What is the maximum working pressure of this filter?

The maximum working pressure (PS) is 50 bar (680 psi according to UL certification). This makes the filter suitable for high-pressure systems using R410A, R448A, R449A and similar refrigerants.

How is the DF316/M10S installed — soldered or threaded?

The filter has ODS solder connections with a diameter of Ø10 mm. Installation requires brazing in a nitrogen atmosphere, which provides a permanently leak-tight joint in line with good refrigeration practice and PED 2014/68/EU requirements.

What is the filter capacity and when should it be replaced?

The nominal desiccant capacity is 250 cm³. Replacement is recommended whenever the system is opened (compressor service, valve replacement), when moisture is detected in the system (moisture indicator, TXV/EEV performance issues) or after prolonged downtime without nitrogen purge protection.

Can this filter be used with HC refrigerants (propane R290, isobutane R600a)?

Yes. Castel DF316/M10S is explicitly approved for use with A3 hydrocarbons (R290, R600, R600a, R1270). When using these refrigerants, additional safety requirements for ventilation and explosion protection at the installation site must be followed according to applicable national regulations.

Note: The technical specifications shown are taken from official Castel S.r.l. materials. Before selecting the component, verify compatibility with the system design and applicable local regulations.