HOW TO INSTALL
Low maintenance. No moving parts to wear stick or hang up,
as in float devices.
Solid state circuitry. Designed for the highest level of perfor-
mance and reliability.
Automatically shuts off burner, after delay, in a low water
condition to prevent dry firing.
Time delay allows water to feed above the probe to a safe
operating level.
INTERMITTENT LEVEL TEST – periodically monitors settled water
level for added protection of today’s smaller steam boilers.
Loosen the two control cover binding head
screws and remove the cover. Assemble the
chassis to the probe flange and secure with the
screws provided with the probe.
Connect the ring terminal wire lead to the probe
terminal stud and secure with the lock washer
and wing nut provided. With the power removed,
proceed with installation and wiring according to
the instructions on pages 3-4. Upon completion
of wiring replace control cover.
5
4
Low Water Cut-Offs
For Steam Boilers
120 VAC Operating Voltage
Max. Pressure 15 psi
U.S. Patent Nos. 5,739,504 & 6,390,027
CG450 Series
CGT450 Series
126 Bailey Road
North Haven, CT 06473
Phone: (203) 776-0473 • FAX: (203) 764-1711
www.hydrolevel.com
1
3
1/4"
2
SAFE
WATER
LINE
The probe may be installed in the
boiler above the lowest safe
water level established by the
boiler manufacturer. Most manu-
facturers provide a suitable open-
ing in the side of the boiler.
Allow 1/4" clearance from the probe to any boil-
er surface, tube or baffle. NOTE: Excessive use of
Teflon tape to seal probe piping threads may
insulate the control from boiler ground. This
could result in the control not operating.
WARNING –
To prevent electrical shock or equip-
ment damage, power must be off during installa-
tion or servicing of the control. To prevent serious
burns, the boiler should be thoroughly cooled
before installing or servicing control. Only quali-
fied personnel may install or service the control
in accordance with local codes and ordinances.
Read instructions completely before proceeding.
