Hydrolevel VXT-24 User Manual

Model VXT-24

Programmable
Water Feeder for
Steam Boilers

24 VAC Operating Voltage

atent Pending

P

SPECIFICATIONS

MAXIMUM FLUID
TEMPERATURE: 150°F

AMBIENT TEMPERATURE: 100°F
FLOW RATE: 1 GPM
MAXIMUM FEED: 10 Gallons (2 Cycles)
ELECTRICAL: 24 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

mount of water added to the boiler – essential in diagnosing water loss

a
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 sys­tem flooding and costly water damage if burner operation does not
resume after two

consecutive feed cycles.

INSTALLATION

Step 1 Warning Step 2 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. Remove and
clean the feed valve strainer after the first feed cycle to remove any conta­minents introduced during installation.

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

LIMITED MANUFACTURERʼS 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 3 Wiring

elect the wiring diagram below that corresponds to the low water cut-off installed on the boiler. Consult boiler manufacturerʼs

S
instructions for proper burner terminal connections.

Hydrolevel

Safgard Model 400 / CycleGard CG400

STANDARD WIRING

Note: If there is no jumper installed on the low water cut-off

between 1 and P1, see ALTERNATE WIRING box.

Safgard Model OEM-24TD

STANDARD WIRING

Note: If there is no jumper installed on the low water cut-off

between 2 and P1, see ALTERNATE WIRING box.

IMPORTANT

o prevent over-

T

eeding and possible

f
flooding, when used

ith the OEM-24TD,

w

he VXT should be

t

et with a Feed

s

elay of 10 minutes

D
and a Feed Amount
of 1 to 5 gallons
(see step 5).
DO NOT USE LWCO
SETTING.

cDonnell & Miller

M

PS-800 Series – Newer Models

STANDARD WIRING

Note: If there is no jumper installed on the low water cut-off

between H and C, see ALTERNATE WIRING box.

PS-800 Series – Older Models

STANDARD WIRING

Note: If there is no jumper installed on the low water cut-off

between 1 and 3, see ALTERNATE WIRING box.

If there is no jumper installed between terminals 1 and P1 on the low cut-off
(between 2 and P1 on Model OEM-24TD), then the cut-off is powered by a
separate power source from the burner circuit and the following wiring must
be used:
minal on the cut-off.
burner circuit hot.
circuit common.

Connect a wire from the FEED terminal on the feeder to the A ter-



Safgard & CycleGard Models:

Connect a wire from terminal H on the feeder to the



Connect a wire from terminal N on the feeder to burner



Float Style Control

Using the burner circuit to power the feeder

Using a separate power source for the feeder

ALTERNATE WIRING

If there is no jumper installed between terminals H and C on the low water cut­off (terminals 1 and 3 on older models), then the cut-off is powered by a sep­arate power source from the burner circuit and the following wiring must be

Connect a wire from the FEED terminal on the feeder to the W (4 on

used:



older models) terminal on the cut-off.
the feeder to the burner circuit hot.
feeder to burner circuit common.

PS-800 Series:

Connect a wire from terminal H on



Connect a wire from terminal N on the



Honeywell

Model RW-700 Guard Ring