Mcdonnell-miller MM 286 Series 1575 Low Water Cut-Off User Manual

Series 1575Low Water Cut-Off/Pump ControllerFor Steam Boilers and Other Level Control ApplicationsFEATURESProbe Chamber:• Cast Iron Body• Sight Glass

Green LED does not turn on.• There may be no power to the unit. Check wiring connected to ‘H’ and ‘N’ terminals on circuit board.Verify that the contr

MAINTENANCESCHEDULE:Blow down control as follows when boiler is inoperation.• Daily if operating pressure is above 15 psi.• Weekly if operating pressu

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2Electronic Control UnitBurner Relay Time DelayThe field-adjustable time delay (DOB) helps to p r event nuisance bu r ner shut-dow n . The number of s

3SPECIFICATIONSM a x i mum Pressure: 150 psi (10.5 kg/cm2)Burner Delay (DOB): 0 to 60 seconds (Field Adjustabl e )Ambient Te m p : 120˚F Max.N OT E :

4When the water level in the boiler drops below themiddle probe, the circuit is broken which will a c t i vate the pump relay, turning the pump on. W

Connect wires between C o n t rol Box and P ro b e sas fo l l ow s .P r o b e s C o n t ro lS h o r t e s t / B l u e S h o r t e s t / B l u eM i d d

6Circuit Board LayoutSTEP 2 - Electrical Wiring• To prevent electrical shock , turn off the electrical power before making electrical connections.• Th

7• Connect wire “ a ” from power supply to t e rminal “ H ” .• Connect wire “ b ” from neutral supply to t e rminal “ N ” .• Connect wire “ c ” from p

8STEP 3 - TestingProcedureTurn on power to the boiler and pump circuits. With the boiler empty,the control will be activated (Green LED On) and the pu

Adjusting Burner Delay (DOB)The boiler should begin to fill with wa t e r.N OT E : If water does not start filling the boiler,immediately turn off the