WARNING –
To prevent electrical shock or equip-
ment damage, power must be off during installation
or servicing of the control. To prevent serious burns,
the boiler should be thoroughly cooled before
installing or servicing control. Only qualified person-
nel may install or service the control in accordance
with local codes and ordinances. Read instructions
completely before proceeding.
The probe may be installed in the boiler above the
lowest safe water level established by the boiler
manufacturer. Most manufacturers provide a suit-
able opening in the side of the boiler.
Allow 1/4" clearance from the probe to any boiler
surface, tube or baffle. NOTE: Excessive use of
Teflon tape to seal probe piping threads may insu-
late the control from boiler ground. This could result
in the control not operating.
Low Water Cut-Offs
For Steam Boilers
24 VAC Operating Voltage
Max. Pressure 15 psi
U.S. Patent Nos. 5,739,504 & 6,390,027
HOW TO INSTALL
1
2
3
5
1/4"
SAFE
WATER
LINE
126 Bailey Road
North Haven, CT 06473
Phone: (203) 776-0473 • FAX: (203) 764-1711
www.hydrolevel.com
Low maintenance. No moving parts to wear stick or hang up,
as in float devices.
Solid state circuitry. Designed for the highest level of
performance 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.
CG400 Series
with
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, pro-
ceed with installation and wiring according to the
instructions on page 2. Upon completion of wiring
replace control cover.
4
R E M O T E M O U N T E D M O D E L S O N LY
A.
To secure mounting plate to boiler jacket,* pre-drill two 3/32" pilot holes using the mounting
plate as a template. Secure plate with sheet metal screws provided. Attach control to mounting
plate by slipping keyholes in back of chassis over pre-mounted screws on plate. Tighten screws.
B.
Using a wire nut, attach a wire (min 90°C) to the pigtail lead in the control box. Attach the other
end to the probe terminal in the remote probe housing. Attach a second wire between the ground
screw on the control chassis and one of the four screws in the remote probe housing. Note: Wires
and wire nuts not provided.
*Or other suitable surface
B
A
WARNING
Frozen pipes/water damage. Central heating systems are
prone to shut down as a result of power or fuel outages,
safety related fault conditions or equipment failure. Installation of freeze protection
monitoring or other precautions is recommended for unattended dwellings in climates
subject to sustained below-freezing temperatures.
