Brochure

Intermittent Level Test Function
To provide added protection to today’s smaller boilers, the CycleGard low water cut-off is equipped with
an Intermittent Level Test. This feature adds protection against false signals that can be caused by foam
and volatile water conditions inside the boiler.
How do you know if the boiler is foaming?
Even when water in the gauge glass appears calm and stable,
water in the boiler can be experiencing significant foaming and
volatility.
If you have ever drained the boiler water to the bottom of a
gauge glass and the low water cut-off did not shut down the
burner, you were likely experiencing a foaming condition inside
the boiler. To determine if that is the case, end the call for heat
(but keep power to the system) after lowering the water level.
Odds are, the Low Water light will come on in about 30 sec-
onds. You can then re-establish the call for heat; the control
will remain in low water and prevent the burner from firing.
This simple test proves two things. First, it proves that some-
thing (foam) prevented the low water cut-off from detecting the
water level when the burner was running, but not when the burner was off. Second, it proves the effective-
ness of the Intermittent Level Test equipped on all CycleGard cut-offs. The CycleGard gets an accurate
reading at regular intervals and protects the boiler like no other low water cut-off.
Despite the unprecedented level of protection offered by CycleGard controls, Hydrolevel still strongly rec-
ommends that you clean the boiler when a foaming condition is discovered. Proper cleaning of the boiler
– following the boiler manufacturer’s instructions – will greatly reduce or eliminate foaming and provide for
optimal steam performance.
CycleGard
Model
Voltage
Frequency of
Intermittent Level
Test
Duration of
Intermittent Level
Test
CG400-2090* 24 VAC every 20 minutes 90 seconds
CG450-1560** 120 VAC every 15 minutes 60 seconds
CG450-2060 120 VAC every 20 minutes 60 seconds
**Standard on most gas boilers
**Standard on most oil boilers
126 Bailey Road • North Haven, CT 06473 • [phone] • FAX [phone] • www.hydrolevel.com