Hydrolevel CG470 User Manual

Automatically shuts off burner, after delay, in a low water
condition to prevent dry firing.

CG470 Series

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

MOUNTING THE CONTROL

The probe may be
installed in the boiler
above the lowest safe
water level established by
the boiler manufacturer.
Most manufacturers pro­vide a suitable tapping in
the side of the boiler.

SAFE
WATER
LINE

Enhanced Intermittent Level Test technology – active only
when water is at boiling temperature. Provides added protec­tion in foaming and volatile water conditions.

Time delay sequencing prevents burner short-cycling caused
by momentary dips in water level and allows a water feeder
to replenish water to a level above the probe.

Integral temperature sensor provides High Limit Lock-Out
feature for an unprecedented level of boiler protection.

STEP 1 Screw the probe

into the LWCO tapping in 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.

1/4"

STEP 2 Loosen the two control cover screws and remove the cover.

Assemble the chassis to the probe flange and secure with the screws provided.

WARNING

installing or servicing control. Only qualified personnel may install or service this control in
accordance with local codes and ordinances. Read instructions completely before proceeding.

WARNING

is recommended for unattended dwellings in climates subject to sustain below-freezing temperatures.

Electrical shock hazard. To prevent electrical shock, death or
equipment damage, disconnect power supply before

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

83 Water Street • New Haven, CT 06511 • Phone [phone] • FAX [phone] • www.hydrolevel.com

STEP 3 Plug the wire lead from the probe into the

mating connection on the circuit board.

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CAUTION

should be thoroughly cooled before installing or
servicing control.

To prevent serious
burns, boiler

WIRING – Model CG470

1 2 3

Connect input voltage (120 VAC, 60 HZ) to
terminals 1 and 2.

4

Connect terminal 2 to burner circuit neutral.
Connect terminal P2 to burner Circuit in
series with other limit controls. Consult boil­er manufacturer instructions for proper ter­minal connections. Control should be wired
in series with and before other limit controls.

Detail of SmartCycle Connection

Model CG470

Optional water feeder connection.

Connect feeder N to terminal 2. Connect Feeder
H to terminal 1. Connect feeder “FEED” or “W”
to terminal A. For water feeders with 2 leads,
connect feeder neutral to terminal 2 and feeder
hot to terminal A.

NOTE: Use of a solenoid valve or McDonnell &
Miller Model 101A water feeder may cause
flooding and is not recommended for use with
this low water cut-off.

OPTIONAL ACTIVATION

Connect “SMTCYC” terminal on the
CycleGard control to the orange burner wire
(120VAC) located under the primary. See
detail illustration at the right.

See SmartCycle description on next page.

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