Description
McDonnell & Miller 194 (166600) – Low-Water Cut-Off & Pump Controller with TC-4 Test-N-Check Blow Down Valve
1¼″ NPT | 250 PSI | No. 5 SPDT Switch
The McDonnell & Miller 194 is a low-water cut-off and pump controller designed for hot water boiler systems. This model includes a No. 5 SPDT switch for dependable pump or burner control and comes paired with the TC-4 Test-N-Check blow down valve for simplified code-compliant testing.
The TC-4 valve streamlines ASME CSD-1A-mandated testing of low-water cut-offs by allowing blow down without draining the entire system. It features upper and lower valves with tapped 1″ NPT FIP connections, plus an adjustable vacuum breaker to quickly evacuate water from the float chamber.
Key Benefits:
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Integrated safety & control – Combines low-water cut-off with pump control in one unit
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Code-compliant testing – TC-4 valve meets ASME CSD-1A requirements
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Quick maintenance – Adjustable vacuum breaker for fast float chamber drainage
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Durable construction – Handles up to 250 PSI and 250°F
Applications:
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Hot water boilers in commercial, industrial, and institutional settings
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Systems requiring both low-water protection and pump control
Specifications
| Attribute | Details |
|---|---|
| Model Number | 194 (166600) |
| Product Type | Low-Water Cut-Off & Pump Controller |
| Switch Type | No. 5 SPDT |
| Connection Size | 1¼″ NPT (Controller) / 1″ NPT FIP (Valve) |
| Max Pressure | 250 PSI (Controller), 160 PSI (Valve) |
| Max Temperature | 250°F (121°C) |
| Valve Included | TC-4 Test-N-Check Blow Down Valve |
| Approvals | ASME CSD-1A Compliant (Testing) |
