Hydrolevel VXT-120 User Manual

Model VXT-120

Programmable
Water Feeder for
Steam Boilers

120 VAC Operating Voltage

Patent Pending

SPECIFICATIONS
MAXIMUM FLUID

TEMPERATURE: 150°F
AMBIENT TEMPERATURE: 100°F
FLOW RATE: 1 GPM
MAXIMUM FEED: 10 Gallons (2 Cycles)
ELECTRICAL: 120 VAC, 60 HZ

• UNIVERSAL COMPATIBILITY: The VXT feeder can be used with virtually
any probe or float-type low water cut-off.

• FEED COUNTER: Brightly illuminated feed cycle counter displays the
amount of water added to the boiler – essential in diagnosing water loss
problems that can severely shorten the life of a steam boiler. Built-in mem­ory prevents power interruptions from clearing the counter.

• PROGRAMMABLE FEED DELAY SETTINGS: Helps prevent flooded boilers.
Allows time for condensate to return to the boiler before starting feed
cycle – ensuring that additional water is needed.

• PROGRAMMABLE FEED AMOUNT SETTINGS: Six settings provide two
ways to feed: 1-5 gallon settings feed

above

the Low Water Cut-Off to
restore boiler’s normal operating level. Or, select LWCO setting to end the
feed cycle when the Low Water Cut-Off re-energizes the burner.

• UNDERFEED PROTECTION: If one feed cycle is not sufficient to restore
boiler operation, the VXT will delay and feed one additional cycle.

• LOCKOUT FLOOD PROTECTION: The VXT locks-out to prevent steam sys-
tem flooding and costly water damage if burner operation does not
resume after two

consecutive feed cycles.

INSTALLATION

Step ➊– Warning Step ➋– Plumbing

WARNING – To
prevent electrical
shock or equipment
damage, power
must be off during
installation or ser­vicing of the con-

serious burns, the boiler should be thoroughly cooled
before installing or servicing control. Only qualified
personnel may install or service the control in accor­dance with local codes and ordinances. Read instruc­tions completely before proceeding.

We warrant products manufactured by Hydrolevel Company to
be free from defects in material and workmanship for a period
of two years from the date of manufacture or one year from
the date of installation, whichever occurs first. In the event of
any claim under this warranty or otherwise with respect to our
products which is made within such period, we will, at our
option, repair or replace such products or refund the purchase
price paid to us by you for such products. In no event shall

trol. To prevent

Feeder must be installed with a manual by-pass. Use isolation valves and
unions to allow easy removal for service or replacement.

Note: Arrow on VXT valve indicates direction of water flow.

LIMITED MANUFACTURER’S WARRANTY

Hydrolevel Company be liable for any other loss or damage,
whether direct, indirect, incidental or consequential. This war­ranty is your EXCLUSIVE remedy and shall be IN PLACE OF
any other warranty or guarantee, express or implied, includ­ing, without limitation, any warranty of MERCHANTABILITY or
fitness for a particular purpose. This warranty may not be
assigned or transferred and any unauthorized transfer or
assignment thereof shall be void and of no force or effect.

P.O. Box 1847 • New Haven, CT 06508 • Phone: [phone] • FAX: [phone] • www.hydrolevel.com

Step ➌– Wiring

Select the wiring diagram below that corresponds to the low water cut-off installed on the boiler. Consult boiler manufacturer’s
instructions for proper burner terminal connections.

Hydrolevel
Safgard Model 450 / CycleGard CG450

STANDARD WIRING STANDARD WIRING

ALTERNATE WIRING: If the power source for the low water

cut-off is separate from the burner circuit, remove the
jumper between 1 and P1, connect the red wire to A, con­nect the black wire to the burner circuit hot and the white
wire to the burner circuit common.

McDonnell & Miller
PS-800 Series

ALTERNATE WIRING: If the power source for the low water
cut-off is separate from the burner circuit, do not install
jumper between H and C. Connect the red wire to W, con­nect the black wire to the burner circuit hot and the white
wire to the burner circuit common.

Honeywell

Float Style Control

Model RW-700 Guard Ring

STANDARD WIRING STANDARD WIRING

ALTERNATE WIRING: If you choose to wire the feeder to a

separate power source from the burner circuit, do not install
jumper between 2 and 3. Connect the red wire to 4, the
black wire to the hot side of power source and the white
wire to common.

ALTERNATE WIRING: If you choose to wire the feeder to a
separate power source from the burner circuit, do not install
jumper between L1 and A. Connect the red wire to A, the
black wire to the hot side of power source and the white
wire to common.