Xylem MM 414B Series 150E and 157E Low Water Cut-Off/Pump Controllers For Steam Boilers and Other Level Control Applications - Manual (Page 2)

SPECIFICATIONS
Maximum Pressure: 150 psi (10.5 kg/cm 2 )
2
FEATURES
Burner Delay (DOB): 0 to 60 seconds (Field Adjustable)
Ambient Temp: 120˚F Max.
NOTE: The circuit board is protected with a sensor which will
shut down the unit if the temperature at the board exceeds
176˚F (80˚C). The board will reset when the temperature at
the board drops below 167˚F (75˚C).
Burner Relay Time Delay
There is a field-adjustable time delay (DOB) to
prevent nuisance burner shut-down. The number
of seconds water needs to be off the bottom probe
before the burner relay is deactivated can be set
between 0 and 60 seconds.
Redundant Low Water Cut-Off
When the boiler water drops below the middle
probe, a 3 minute timing circuit will be activated. If
water does not return to the middle probe within
three minutes, the burner relay will deactivate. The
Red LED will flash once every second if this
condition occurs.
• Automatic Reset units will automatically reset
when the water level is restored to the middle
probe.
• The reset button on Manual Reset units will
have to be pressed after water is restored to
the middle probe.
NOTE: The timing circuit will automatically reset
if the water level is restored to the middle probe
within 3 minutes.
Redundant Pump Off
The pump relay will be activated after water drops
below the middle probe. If the water level is not
restored to the top probe within 3 minutes the pump
relay will be deactivated. After the pump relay is
deactivated, normal operation is resumed. Water
must again drop off the middle probe to activate the
pump relay. There is no LED signal for this
occurance.
CSD-1 Code Compliance
On Manual Reset units, if the control is in a low
water condition (burner relay deactivated) prior to
an interruption of power, the control will remain in a
low water condition when power is restored. The
reset button will need to be pressed when the water
level again covers the middle probe.
Adjustable Pump Differentials
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