Xylem McDonnell & Miller UWH-RB-24SE Instruction Manual

1 Operation
1.1 Specification
The Universal Wiring Harness allows the RB-24SE LWCO to be connected to
most residential hot water boilers that have a 24 volt burner circuit.
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: 160 psi (11.2 kg
Maximum Water Temperature: 250°F (121°C)
Table 1: Electrical Ratings
Voltage Power Consumption
24 VAC 2.5 VA
DOB: up to 5 seconds.
Enclosure Rating: NEMA 1 General Purpose
Probe Sensitivity: 15,000 ohms Conductive liquid required (water/glycol mixtures
up to 50% concentration may be used).
4-7/16"
1-3/32"
1-5/32"
3/4" NPT
1. Cable Connector
2. Power On Green LED
3. Red LED Low Water
4. Test Button
IMPORTANT: Do not use Model RB-24SE on steam boilers
IMPORTANT: Do not use on millivolt systems.
Model UWH-RB-24SE
Universal Wiring Harness
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)
Switching Capacity
2A at 24 VAC
2"
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2 General information
2.1 General Safety
WARNING:
derstand instructions.
Save these instructions for future reference.
WARNING:
All work must be performed by qualified personnel
trained in the proper application, installation, and main‐
tenance of plumbing, steam, and electrical equipment
and/or systems in accordance with all applicable codes
and ordinances.
WARNING:
the electrical power before making electrical connec‐
tions.
WARNING:
This low water cut-off must be installed in series with all
other limit and operating controls installed on the boiler.
After installation, check for proper operation of all of the
limit and operating controls, before leaving the site.
WARNING:
This product can expose you to chemicals including
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Lead, which is known to the State of California to cause
cancer and birth defects or other reproductive harm.
For more information go to: www.P65Warnings.ca.gov.
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WARNING:
We recommend that secondary (redundant) Low Water
Cut-Off controls be installed on all steam boilers with
heat input greater than 400,000 BTU/hour or opening
above 15 psi of steam pressure. At least two controls
should be connected in series with the burner control
circuit to provide safety redundancy protection should
the boiler experience a low water condition. Moreover,
at each annual outage, the low water cutoffs should be
dismantled, inspected, cleaned, and checked for proper
calibrations and performance.
INSTRUCTION MANUAL
MM-211662REV1
www.xylem.com/mcdonnellmiller
Before using this product read and un‐
To prevent electrical shock, turn off
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