Hydrolevel low water cut-offs are electrically operated. A probe is installed in the boiler shell or external manifold and is connected to the control unit. Water is used as a conductor to complete the circuit between the probe and the boiler shell. When water is in contact with the probe, the circuit is completed; when the water level drops below the probe, the circuit opens. Hydrolevel controls provide contacts to de-energize the burner circuit in a low water condition.Reliable Electronic...

120volt Hot Water Boiler Low Water Cut Off. Compact DesignAutomatic ResetBurner Circuit Test ButtonPower and Low Water LED Indicators Interrupts power immediately in a low water condition. Automatically restarts burner on return of water level. Features test button, onboard indicating lights and easy to follow installation instructions. Model 1100 includes plug-in wire harness with labeled quick-connect terminals. ...

Hydro Level 400 24volt Steam Boiler Low Water Cut Off. 15 Second Burner Off Delay 30 Second Burner On Delay Automatic Reset Low Water Indicating Light Direct Boiler Mounting ? Eliminates Blowdowns Burner circuit contacts open after 15 second delay in a low water condition. Delay prevents short cycling caused by momentary fluctuations in the boiler water level. Automatically reactivates burner circuit 30 seconds after water reaches the probe, allowing optional water feeder to raise ...

120volt Manual Reset Steam Boiler Low Water Cut Off. 15 Second Burner Off Delay 30 Second Burner On Delay Automatic Reset Low Water Indicating Light Direct Boiler Mounting ? Eliminates Blowdowns Burner circuit contacts open after 15 second delay in a low water condition. Delay prevents short cycling caused by momentary fluctuations in the boiler water level. Automatically reactivates burner circuit 30 seconds after water reaches the probe, allowing optional water feeder to raise ...

120volt Manual Reset with 30 Second Delay Hot water Boiler Low Water Cut Off. Manual Reset with 30 Second Delay and Power Outage ProtectionBurner Circuit Test Button (500 Series only) LED Indicating Lights Meets ASME CSD-1 Requirements for SecondaryCut-Offs on Commercial Steam Boilers Interrupts power immediately in a low water con-550 120 VAC dition. Burner circuit locks-out if water remains below probe for 30 seconds. Manual reset will not trip due to power failures. Test button checks...

Mcdonnell & Miller (149400) 67 Low Water Cutoff Features and Benefits For residential and commercial applicationsFor boilers of any steaming capacityQuick hook-up fittings providedLever-operated, full port ball valve for easy blow downAdjustable BX outlet for easy installationDual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder Optional features Low voltage switches for self-generating millivolt circuitsManual reset switchLarge float...

Mcdonnell & Miller 110000 #2 Switch

Mcdonnell & Miller 143600 64 Low Water Cutoff

Mcdonnell & Miller 153700 767 Low Water Cut Off.

Mcdonnell & Miller 153825 6667 Head Mechanism

Mcdonnell & Miller 155300 369 Low Water Cutoff

Mcdonnell & Miller 344200 SA67-2 Float & Bellows Assemby

Mcdonnell & Miller 354081 PA-800 PSE Series 3/4" Standard Probe

Mcdonnell & Miller (176234) 120volt Manual Reset Hot Water Boiler Low Water Cutoff. The Series 751 probe type LWCOs provide protection against low water conditions for commercial and industrial applications. These controls are fully CSD-1 compliant and are primarily used as LWCOs on hot water heating boilers. Green LED indicates power OnRed LED indicates Low WaterTest buttonMeets requirements of ASME Standards CSD-1No lock out with loos of power if probe is in water 20,000 ohms probe...

Mcdonnell & Miller 24volt Hot Water Boiler Low Water Cutoff.

The Series PSE-800 probe type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut the burner off based on the volatility/variability of the resistance readings. This new patented technology provides the best protection possible without turning off the boiler unless a low water condition exists. As an added measure of safety, the control will turn off the boiler if it recognizes an out-of-water...

Mcdonnell & Miller (153828) PSE-801-U-120 Steam Boiler Low Water Cutoff 120volt with Extended Probe. The Series PSE-800 probe type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut the burner off based on the volatility/variability of the resistance readings. This new patented technology provides the best protection possible without turning off the boiler unless a low water condition...

The Series PSE-800 probe type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut the burner off based on the volatility/variability of the resistance readings. This new patented technology provides the best protection possible without turning off the boiler unless a low water condition exists. As an added measure of safety, the control will turn off the boiler if it recognizes an out-of-water...

Mcdonnell & Miller RB-122-E 120volt Hot Water Boiler Low Water Cutoff. Features and Benefits For residential and commercial applications Electronic operation Easy to install and wire Red low water indicating LED Green power indicating LED Now with test button Automatic reset No blow down required 20,000 ohms probe sensitivity Maximum ambient temperature 120°F (49°C) Maximum water temperature 250°F (121°C) Maximum water pressure 160 psi (11.2 kg/cm2) ...

The RB-24E low water cut-off offers several features: Brass threads provide a metal-to-metal seal that ensures a leak-free installation.Integrated wrench flats enable secure installation without damage to the housing.McDonnell & Miller’s patented self-cleaning probe minimizes scale build-up and extends the recommended cleaning interval to 5 years.“Plug & Play” wiring harnesses are available for most residential gas-burning boilers.McDonnell & Miller RB-24E Low Water Cut-Off Patented...

Mcdonnell & Miller PSE802-24 Steam Boiler Low Water Cutoff. Features and Benefits Green power is on indicating LEDRed low water indicating LED30 second DOMTest buttonSelf-Cleaning probeNo lock out with loss of power if probe is in waterProvisions to add water feeder of alarmModels available with:120 VAC24 VAC (meets ANSIZ21.13a specification)“U” probe (extended barrel)“FIX2” probe (remote) ...

Mcdonnell & Miller PSE801-120 120Volt Manual Reset Steam Boiler Low Water Cutoff.The Series PSE-800 probe type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut the burner off based on the volatility/variability of the resistance readings. This new patented technology provides the best protection possible without turning off the boiler unless a low water condition exists. As an added...