Manual

2
1
3
/
16
"
3
/
4
" NPT
1
3
/
16
"
5
3
/
4
"
1
7
/
8
"
Cable
Connector
Power On
Green
LED
Test
Button
Red LED
Low Water
OPERATION
SPECIFICATIONS
The Model RB-24 Low Water Cut-Off is specifically
designed to provide burner cut-off if there is an
unsafe water loss, which can result from a broken
or leaking radiator or pipe, or a cracked section in
the boiler.
Water/glycol mixtures up to 50% concentration
may be used.
Electrical Ratings
Power
Voltage Consumption Switching Capacity
24 VAC 2.5 VA 2A at 24 VAC
Temperature:
Storage: -40˚F to 120˚F (-40˚C to 49˚C)
Ambient: 32˚F to 120˚F (0˚C to 49˚C)
Humidity: 85% (non-condensing)
Maximum Water Pressure: 50 psi (3.5 kg/cm
2
)
Maximum Water Temperature: 250˚F (121˚C)
Enclosure Rating: NEMA 1 General Purpose
The UWH-RB-24S is for use on hot water boilers that have a
transformer plug connection on the aquastat.
The UWH-RB-24A is for use on hot water boilers that have
a vent damper
The UWH-RB-24L is for use on hot water boilers that have a
control panel connection
IMPORTANT: Universal wiring harness adaptors
are now available for use with systems having
modular plug-on burner controllers and vent
dampers (sold separately).
UWH-RB-24A
P/N 144681
UWH-RB-24L
P/N 144691
UWH-RB-24S
P/N 144682