Hydrolevel CGT450 Series - Manual (Page 3)

Operating Instructions
NOTE
For proper low water cut-off operation, the boiler should be cleaned at
initial installation and periodically thereafter. Refer to the boiler manu-
facturer’s instructions for cleaning procedures.
OPERATING TEST PROCEDURE
1. After installation, bring the boiler water to a safe operating level, turn
on power and set the thermostat to call for heat. The amber LED
lamp should be off. The boiler will fire immediately.
2. Slowly lower the boiler water to a point below the probe. The amber
LED lamp on the control will light. The lamp may begin to flicker with
the bouncing water level. Stop draining the boiler when the lamp
glows steadily. NOTE: The water should not be lowered beyond a
visible point in the gauge glass.
3. The boiler will shut down within 15 seconds.
IF BURNER DOES NOT SHUT DOWN IN LOW WATER
1. Check terminal block wiring to insure that all connections are cor-
rect.
2. Check the probe installation to insure that there is 1/4" clearance
from any surface within the boiler or pipe. (Refer to Step 3 on page 1
of this instruction sheet.
3. Clean the boiler in accordance to the manufacturer’s instructions.
Machining oils, grease, rust and other contaminants in the boiler
water can cause foaming or surging and make a low water condition
difficult to detect during burner operation.
IF THE AMBER LED LAMP IS ON
The amber LED lamp indicates that the water is below the probe. If the
gauge glass shows that the water is at the correct operating level and
the amber LED is lit check the following:
1. Check for plugged gauge glass.
2. Make sure probe lead wire is properly secured to the terminal.
3. Check for proper ground between probe and boiler shell. Excessive
use of Teflon tape or sealing compound may isolate the probe from
the boiler shell.
4. Remove probe and examine for oily residue. Clean probe with steel
wool and skim boiler.
IF THE GREEN LED LIGHT IS ON
The green LED lamp indicates that the control is conducting an
Intermittent Level Test. The burner does not fire during the test period.
See Intermittent Level Test Feature on this page for more details.
Maintenance
To ensure optimum performance remove and inspect probe annually.
Clean any sediment or scale from the probe using a scouring pad or
steel wool. Re-install the probe and perform the Operating Test
Procedure described above.
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 assur-
ing safe and accu-
rate operation.
The last four digits
of the CycleGard
model number
determine the fre-
quency and dura-
tion of the Intermittent Level Test (ILT) as shown in the table.
When the optional SmartCycle feature
is activated (see wiring instruction on
previous page), 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 pro-
duction of hot water.
CycleGard
Intermittent
Level Test
Feature
Burner Connection
Model CG450 and CGT450
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