User Guide

Page 4 of 8
INSTALLATION (continued)
Testing
Do NOT fi ll the boiler with water. Set the thermostat to the lowest setting. Turn electric power on to the boiler. On initial 1.
start-up, the LWCO indicates a low water condition, which indicates proper function. The “Low Water” LED on the
control unit illuminates RED and the Power LED illuminates GREEN. NOTE: The burner should not operate without
water in the system.
Fill the boiler with water. When water covers the probe, the RED “Low Water” LED on the control turns off.2.
Set the thermostat to call for heat and make sure that the burner ignites.3.
With the burner “on”, activate the test feature (“How To Test the LWCO” on page 6) while observing the burner and the 4.
“Low Water” LED on the Control. After the “Low Water” LED illuminates RED, the burner should turn off.
Wait 1 minute (for test period to end) and verify that the burner ignites (provided water covers the probe). The RED 5.
“Low Water” LED on the control unit turns off.
If the burner fails to cutoff or relight, see the Troubleshooting section for details. If operation is normal, set the 6.
thermostat to the normal setting.
Once correct operation of the LWCO has been tested, test all other safety, limit, and control devices before fi nalizing
system operation.
USER INTERFACE
LWCO Features
LED Description
Green Power Power indicator
Red Low Water Low water/fault indicator
Amber Service Service required indicator
Green TX Enviracom® communication indicator
LED States*
Red Low
Water LED
Amber Service
LED
Meaning
Off Off Normal
On Off Low Water Condition
Off On Safe water level, weak probe signal
– Clean Probe Soon.
On On Probe signal too weak, low water
condition – Service Probe Now
Blinking Off or On Control failure. Lockout in low water
state.
Probe Connection And Led Diagram
During a low water condition, the “LOW
WATER” LED will illuminate RED. In
normal conditions, it turns off. If the LWCO
detects a low signal level from the probe, the
“SERVICE” LED will illuminate AMBER to
signal that probe cleaning may be required.
* States with GREEN “Power” LED turned on. All LED’s off indicates no power to control.