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3

SPECIFICATIONS

M a x i mum Pressure:

150 psi (10.5 kg/cm

2

)

Burner Delay (DOB):

0 to 60 seconds (Field Adjustabl e )

Ambient Te m p :

120˚F Max.

N OT E : The circuit board is protected with a sensor which will
shut down the unit if the temperature at the board ex c e e d s
176˚F (80˚C). The board will reset when the temperature at
the board drops below 167˚F (75˚C).

ELECTRICAL RATINGS & SWITCH RATINGS

Supply

Probe

Full Load (Amps)

Locked Rotor (Amps)

Pilot Duty (VA)

Motor (HP)

Voltage

Voltage

NO (NC), VAC

NO (NC), VAC

NO (NC), VAC

NO (NC), VAC

120 VAC

5 VAC

16   (5.8), 120

96   (34.8), 120

470 (290), 120

1

(1/4), 120

50/60 HZ

maximum

8

(2.9), 240

48   (17.4), 240

470 (290), 240

1

(1/4), 240

M a x i mum System Water Te m p e r a t u r e :

406˚F (208˚C)

M a x i mum System Water Pressure:

250 psi (17.6 kg/cm

2

)

M a x i mum System Steam Pressure:

250 psi (17.6 kg/cm

2

)

All probes in the Series 1575 units are sent from the factory pre-cut to
9" length (229mm). Any of the probes can be used as the low water
cut-off level probe. The 9" length positions the probe at the low water
cut-off cast-in line on the chamber body. The remaining probes can be
‘cut to length’ using a metal cutting saw to achieve desired pump control
(pump on/pump off) and pump differential levels. Approximately 1 inch
of the metal probe rod should be exposed below the  PTFE coating.

4-3/16"
(106.4)

4-3/8"

(111)

A

B

C

D

2-1/2"
(63.5)

3-1/4"
(82.5)

3-1/4"
(82.5)

3-1/8"
(79.4)

1" NPT

11-1/2"

(292)

18-5/8"

(473)

1/2" NPT

1/2" NPT

1/2" NPT

CONDUIT

CONNECTION

1" 
NPT

1" NPT

1/2" NPT

ELECTRODE

PRE-CUT

9" PROBE ROD

CUT AS

NEEDED

Summary of Contents for McDonnell & Miller 1575 Series

Page 1: ...secondary redundant Low Water cut off controls be installed on all steam boilers with heat input greater than 400 000 BTU hour or operating above 15 psi of steam pressure At least two controls should...

Page 2: ...ctivated turning the pump on after water drops below the middle probe If the water level is not restored to the top probe within 3 m i nutes the pump relay will be deactivated shutting off the pump Af...

Page 3: ...System Water Temperature 406 F 208 C Maximum System Water Pressure 250 psi 17 6 kg cm2 Maximum System Steam Pressure 250 psi 17 6 kg cm2 All probes in the Series 1575 units are sent from the factory p...

Page 4: ...l water level but not lower than the lowest safe permissible water level as determined by the boiler manufacturer OR If the control will be the secondary low water fuel cut off size the steam top and...

Page 5: ......

Page 6: ...over Removal and Installation Procedure a To remove cover use a flathead screwdriver to loosen screws and remove the cover K b To reconnect cover slide over brackets and tighten screws using a flathea...

Page 7: ...p Control Connect wire a from power supply to terminal H Connect wire b from neutral supply to terminal N Connect wire c from valve control circuit to terminal PNO Connect wire d from valve control ci...

Page 8: ...PCB is too hot and the unit has shut down The unit will automatically restart when the PCB has cooled sufficiently When using the TEST button the green light will flash once per second during the time...

Page 9: ...nit is factory set at 0 seconds To adjust turn the adjusting screw clockwise using a small flatblade screwdriver to the delay time desired Followthe bl owdown procedure found on page 11 to verify oper...

Page 10: ...pect probes The wiring connections for the pump may not be connected properly Check wiring at terminals Burner does not turn off when water level is below longest probe The probes may be fouled with d...

Page 11: ...ld be opened slowly The piping needs to be wa rmed up and stagant water in the drain piping needs to be pushed out Suddenly opening a blow down valve causes steam to condense which may create water ha...

Page 12: ...poses Seller warrants the goods purchased hereunder with the exception of membranes seals gaskets elastomer materials coatings and other wear parts or consumables all of which are not warranted except...

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