Submittal Sheet
Low Water Cut-Offs – Electronic
RB-24E
Low Water Cut-Offs
• Brass threads enable a secure and trouble-free installation
• Test button to confirm proper operation
• Universal wiring harness fits 100% of today's gas boilers
• -S, -A and -L models provide “plug & play” installation with
most residential boilers
• Compact size
• Easy to install and wire
• Automatic reset feature resumes operations after a power
outage when water is on probe
• Green LED indicating power is on
• Red LED indicating low water condition
• Solid state operation
• 15,000 ohms probe sensitivity
• Maximum ambient temperature 120°F (49°C)
• Maximum water temperature 250°F (121°C)
• Maximum water pressure of 160 psi (11.2 kg/cm3)
RB-24E
Electrical Ratings
AB CDE
NPT
3
⁄4 1
3
⁄16 (30.2) 1
3
⁄16 (30.2) 5
3
⁄4 (180) 1
7
⁄8 (47.6)
Dimensions, in. (mm)
A
B
C
D
E
Note: A 15 mA minimum current draw is required.
Voltage Power Load Switching
Consumption
24 VAC
2.5 V
A 2 A at 24 VAC
RB-24E-S
RB-24E-A
UWH-RB-24S
UWH-RB-24A
Boiler Controls
McDonnell & Miller
Ordering Information
RB-24E-L
UWH-RB-24L
Model Part
Number Number Description
RB-24E 144692 Residential LWCO
RB-24E-A 144694 Residential LWCO w/vent damper harness
RB-24E-S 144693 Residential LWCO w/control board harness
RB-24E-L 144690 Residential LWCO w/burner control harness
UWH-RB-24A 144681 Replacement cable for RB-24E-A
UWH-RB-24S 144682 Replacement cable for RB-24E-S
UWH-RB-24L 144691 Replacement cable for RB-24E-L
ITT
8200 N. Austin Ave.
Morton Grove, IL 60053
Phone (847)966-3700
Facsimile (847)966-9052
www.mcdonnellmiller.com