Install Instructions

2
SPECIFICATIONS
Hz: 50/60
Control Power Consumption: 3 VA (max.)
Probe Sensitivity: 20,000 ohm
(water/glycol mixtures up to 50% concentration may be used)
Automatic Reset Models
Whenever water is below the level of the probe, the
control will go into a low water condition. When the
water level has been restored, the control will auto-
matically return to a run condition.
Manual Reset Models
If a low water condition occurs (water off probe), the
manual reset button must be pressed once the
water level is restored to a level above the probe.
CSD-1 Code Compliance
On Manual Reset units, 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 need to be pressed when the water level
is restored to a level above the probe.
The Series 751P & Series 752P probe type
LWCO's provide protection against low water
conditions for commercial and industrial appli-
cations. These controls are fully CSD-1 compli-
ant and can be used as the primary LWCO on
hot water boilers and as the secondary LWCO
(manual reset) on steam boilers.
C o n t rol Unit
Temperature Ratings:
S t o ra g e : -40˚F to 135˚F (-40˚C to 57˚C)
A m b i e n t : 32˚F to 135˚F (0˚C to 57˚C)
H u m i d i t y : 85% (non-condensing)
Electrical Enclosure Rating: NEMA 1 Genera l
P u rp o s e
M o d e l C o n t r o l Switch Contact Rating
Voltage (Pilot Duty)
752P-MT-24
752P-MT-U-24
24VAC
752P-MT-SP-24
50VA@24VAC
751P-MT-120
120VAC
or
751P-MT-U-120
125VA@120VAC
751P-MT-SP-120
Electrical Specifications
P r obe Specifications
M a x i mum Steam Pressure: 15 psi (1.0 kg/cm
2
)
M a x i mum Water Pressure: 160 psi (11.2 kg/cm
2
)
M a x i mum Water Te m p e r a t u r e : 250°F (121° C)
Connection Size : 3/4" NPT