5
Burner/SmartCycle Wiring Connection
Model CG450 and CGT450
Diagram shows how the signal is sent to the Cyclegard from the primary control.
See page 4 & 5 for limit and LWCO wiring.
To provide added protection to today’s smaller boilers, the CycleGard low water cut-off is
equipped with an Intermittent Level Test. This important feature adds protection against false
signals that can be caused by foam and volatile water conditions inside the boiler. The
Intermittent Level Test removes power from the burner at preset intervals. During the test, foam
dissipates and the water level stabilizes – allowing CycleGard to monitor the true water level in
the boiler assuring safe and accurate operation.
The last four digits of the CycleGard model
number determine the frequency and duration
of the Intermittent Level Test (ILT) as shown in
the table.
When the optional SmartCycle feature is activated (see wiring instructions on pages 4 & 5), the CycleGard’s test
time sequencing is restarted each time the burner fires. This feature enables a full burner run cycle (10 or 20
minutes, depending on model) prior to the first Intermittent Level Test. On CGT450 models (designed for boilers
equipped with tankless coils), SmartCycle suspends the Intermittent Level Test during a call for domestic hot
water allowing the boiler to deliver its full BTU capacity to the production of hot water.
CycleGard Intermittent
Level Test Feature
Last 4 digits
Frequency
Duration
of Model No.
of ILT
of ILT
1090
10 Minutes
90 Seconds
1560
15 Minutes
60 Seconds
2060
20 Minutes
60 Seconds
2090
20 Minutes
90 Seconds
