Xylem MM 273E Model 750-HW-MT-120 Probe Type High Water Manual Reset Control Unit - Manual (Page 2)

Motor Switch Rating (Amperes)
Model Voltage Full Load Locked Rotor Pilot Duty
120 VAC 7.2 43.2 125 VA at
120 VAC
240 VAC 3.6 21.6
120 or 240 VAC
50 or 60 Hz
2
5-1/2"
Test
Green
Power On
Red
High
Water
Reset Button
Model 750-HW-MT-120
Probe Type High Water
Control Unit
SPECIFICATIONS
Control Unit
Temperature Ratings:
Storage: -40˚F to 135˚F (-40˚C to 57˚C)
Ambient: 32˚F to 120˚F (0˚C to 49˚C)
Humidity: 85% (non-condensing)
Electrical Enclosure Rating: NEMA 1 General Purpose
RS-1-BR1 Remote Sensor
Maximum Steam Pressure: 250 psi (17.6 kg/cm
2 )
Maximum Water Pressure: 250 psi (17.6 kg/cm 2 )
Maximum Water Temperature: 406˚F (208˚C)
Electrical Enclosure Rating: NEMA 4X Watertight,
Corrosion Resistant
Connection Size: 1” NPT
RS-1-LP
Maximum Steam Pressure: 15 psi (1.0 kg/cm
2 )
Maximum Water Pressure: 160 psi (11.2 kg/cm 2 )
Maximum Water Temperature: 250˚F (121˚C)
Electrical Enclosure Rating: NEMA 1 General Purpose
Connection Size: 3/4” NPT
Electrical Specifications
Manual Reset
The Model 750-HW-MT-120 control provides continuous protection
against a high water condition in steam boilers. It can be used to
interrupt the burner circuit to turn off the burner, interrupt the
feedwater pump circuit to turn off the pump, or both. The control
can also be used to provide an alarm (light, horn or both) when a
high water condition occurs. The manual reset function will require
that the unit be reset after water has dropped below the level of
the probe.
Control Voltage: 120 VAC
Hz: 50/60
Control Power Consumption: 3 VA (max.)
Probe Sensitivity: 20,000 ohm
On Manual Reset Units, if the control is in high water
condition (water reaches the probe) and there is an
interruption of electric power, the Burner will remain off
even if power is restored. The Reset button must be
depressed to make the control back to function after
the water level drops below the probe.
If a high water condition occurs (water is on the probe),
the Burner will turn Off. The Manual Reset button must
be pressed to make the control back to function after the
water level drops below the probe.