Product Overview

PSE-800-M
Manual Reset LWCO for Steam Boilers
The Series PSE-800-M is a new addition to the McDonnell & Miller
probe type low water cut-off group of products. These controls
are used as the secondary LWCO on steam boilers and can also
be used as the primary LWCO on hot water heating boilers.
Features and Benefits Include
Lockout Delay
If a low water condition occurs (water off probe), the burner will turn off and
the red LED will begin to blink. If the water level is not restored to a level
above the probe with-in 60 seconds, the control will lock out. The reset
button will need to be pressed when water level is restored to a level
above the probe.
CSD-1 Code Compliance
If the control is in a low water condition (water off probe) when there is an
interruption of power, the control will remain in a low water condition when
power is restored. The reset button will have to be pressed when the water
level is restored to a level above the probe.
Power Interruption
If there is a loss of power, the control will automatically reset if there was
water on the probe before the loss of power AND there is water on the
probe when the power is restored.
Self-cleaning Probe
This is available only on McDonnell & Miller probe type controls which
reduces probe maintenance to once every five years instead of annually.
Test Button
Standard on all controls to allow the control to be tested without draining
the boiler or system.
‘Green’ Power On & ‘Red’ LWCO LED’s
Standard on all units to give visual indication that the unit is powered up
and when a low water condition is detected.

Summary of content (2 pages)