Hydrolevel CG400 Series User Manual
How to install 1 2 3 5
WARNING – To prevent electrical shock or
equipment damage, power must be off during
installation or servicing of the control. To pre-
vent serious burns, the boiler should be thor-
oughly cooled before installing or servicing con-
trol. Only qualified personnel may install or ser-
vice the control in accordance with local codes
and ordinances. Read instructions completely
The probe may be installed in the boiler above
the lowest safe water level established by the
boiler manufacturer. Most manufacturers pro-
vide a suitable 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
insulate 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 No. 5,739,504
HOW TO INSTALL
P.O. Box 1847
New Haven, CT 06508
Phone: (203) 776-0473
FAX: (203) 773-1019
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
INTERMITTENT LEVEL TEST – periodically monitors settled
water level for added protection of today’s smaller steam
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 page 2. Upon
completion of wiring replace control cover.
R E M O T E M O U N T E D M O D E L S O N L Y
A. To secure mounting plate to boiler jacket,* pre-drill two 3/32" pilot holes using the mount-
ing 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.
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