The Dungs 224-253A (CPI 400) is a valve-mounted closed position indicator designed to provide both visual and electrical confirmation of automatic shutoff valve position. This SPDT valve switch mounts directly to compatible DUNGS SV, MVD, and DMV series valves and helps signal whether the valve is in the open or closed position.
While code requirements may vary, FM requires 217-665A for visual indication on 1" and larger safety valves, so the CPI 400 meets this requirement.
Standard visual indication uses an orange light for the closed valve position and a green light for the open valve position. When the optional 24 VAC/VDC light is used, the closed position is shown with a red light instead of orange. The CPI 400 switch does not require auxiliary power for its switching function.
The Dungs CPI 400 is recommended for commercial and industrial heating applications using automatic shutoff valves. It is suitable for dry natural gas, propane, butane, air, and inert gases. It may also be used with dry H2S concentrations up to 0.1% by volume when paired with a nickel-plated brass adapter.
Accessories/Replacement Parts Ordering Information:
| PART NO. | DESCRIPTION |
| 240-837 | Clear plastic cover with mounting screws |
| 231-420 | Orange & Green 120 VAC neon lights |
| 248-183 | Red & Green 24 VDC neon lights |
| 220-566 | 1/2” NPT conduit adapter (PG 11) |
| 224-417 | Brass adapter |
Q: What is the Dungs 224-253A CPI 400 used for?
A: The Dungs 224-253A CPI 400 is a valve-mounted interlock switch and closed position indicator used to show whether an automatic shutoff valve is open or closed. It provides both visual indication and electrical switching for valve position monitoring.
Q: Does the CPI 400 provide visual valve position indication?
A: Yes. The CPI 400 uses indicator lights to show valve position. A green light indicates the valve is open, while an orange light indicates the valve is closed. When the optional 24 VAC/VDC light is used, the closed position may be shown with a red light.
Q: What valves does the Dungs CPI 400 mount to?
A: The CPI 400 mounts directly to compatible DUNGS automatic shutoff valves, including DUNGS DMV, SV, and MVD series valves.
Q: Is the Dungs 224-253A the same as CPI 400?
A: Yes. Dungs 224-253A is the order number for the CPI 400 valve switch. Some listings may also reference newer or alternate part numbers, so the product should be verified by application and valve compatibility before ordering.
Q: What type of switch is used in the CPI 400?
A: The CPI 400 uses an SPDT switch. It is suitable for making or breaking a circuit when the valve changes position.
Q: Does the CPI 400 require auxiliary power for switching?
A: No. The CPI 400 switch function does not require auxiliary power. Power is only required when using the indicator lights.
Q: What gases is the CPI 400 suitable for?
A: The CPI 400 is suitable for dry natural gas, propane, butane, air, and inert gases. It may also be used with dry H2S concentrations up to 0.1% by volume when used with a nickel-plated brass adapter.
Q: What is the maximum operating pressure for the CPI 400?
A: The CPI 400 has a maximum operating pressure of 7 PSI, or 500 mbar, according to DUNGS product information.
Q: What is the enclosure rating?
A: The CPI 400 is listed with a NEMA Type 4 enclosure rating, making it suitable for protected industrial and commercial combustion control environments.
Q: What applications commonly use the Dungs CPI 400?
A: The CPI 400 is commonly used in commercial and industrial heating systems that require valve position confirmation on automatic shutoff valves. It helps provide proof of valve open or closed position for combustion safety control systems.
Q: Can the CPI 400 be used as a proof-of-closure switch?
A: Yes. DUNGS states that the CPI 400 may be used as a proof-of-closure switch on valves incorporating overtravel.
Q: Who should install the CPI 400?
A: Installation should be performed under the supervision of a licensed burner technician. The valve must be de-energized, the gas supply must be shut off, and the assembly should be leak tested after mounting.
Q: What product category fits this item?
A: The Dungs 224-253A CPI 400 fits best under valve position switches, interlock switches, combustion control accessories, or automatic shutoff valve accessories.
| CPI Housing | Polycarbonate |
|---|---|
| Maximum Operating Pressure | 7 PSI (500 mbar) |
| Connection | Set Screw with G 1/8" ISO 228 plunger |
| Temperature Range | -40 °F to +150 °F (-40 °C to +65 °C) |
| Electrical Connection | Screw terminals via 1/2" NPT conduit connection |
| Switch Type | SPDT |
| Enclosure Rating | NEMA Type 4 |
| Plunger Material | Brass |
| Seal Material | NBR-based rubber |
| AC Rating | 10 A resistive at 120 VAC; 8 A inductive at 120 VAC; 5 A resistive at 230 VAC |
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good product works as intended.
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