Danfoss ESBE VTC 511 Data sheet

Datasheet

ESBE VTC 511

3-Way Thermic Valve

Applications:

Typical Applications:

• High mass non-condensing boiler coupled

with low return water situations, i.e. snow
melt systems or high mass concrete
radiant floor heating

• Gravity hot water conversion systems

• Solid fuel boilers feeding storage tanks or

a heating system

• Solar heating and stratification control for

storage tank

The ESBE VTC thermic valve is a thermostatic
by-pass valve which regulates the
temperature of either the supply out or the
return of water in a hydronic heating system.
In a conventional application, the VTC valve
safeguards non-condensing boilers against
corrosion from condensation that would
result if a minimum flue gas temperature
is not maintained. With the VTC the boiler
is able to recover and keep up with the
drop in water temperature. The VTC valve
can also be used on a solid fuel boiler or
a solar application where a minimum or
maximum water temperature is trying to be
maintained.

Features:

• Thermostatically maintains a high and steady

return temperature increasing the life and
efficiency of the heat source

• Protection from thermal shock within non-

condensing boilers

• Self contained thermostatic element with no

adjustment required

• Interchangeable thermostat elements, to

meet temperature requirements

• Low leakage rate through the ports of

the valve

Ordering Information:

AI000086403224

* Valve body and thermostat sold separately. Order one valve body and

VTC Valve Body, Without Thermostat*

Code No. Series Cv Valve Size

193 B1701 V TC511 16.2 1-1¼” FNPT

Internal VTC Temperature Element

Code No. Series Typical Application

193 B1702 122 °F (50°C)

193 B170 4 140 °F (60°C)

193 B1709 149 °F (65°C)

193 B170 6 176 °F (80°C)

Spare Parts

Code No. Description

98060150 O-ring for brass plug

one temperature element to assemble a complete valve

Return line boiler protection193 B1703 131°F (55°C)

Boiler outlet, storage tank feed193 B1705 158 °F (70°C)

Connection

© Danfoss | 02/2022 | 1

ESBE VTC 511 3-Way Thermic Valve Datasheet

ESBE VTC 511 3-Way Thermic Valve Datasheet

Valve Selection:

Piping Orientation:

Supply Mounted
(149 °F (65°C), 158°F (70°C), 167°F (75°C) elements)

Circulator

VTC valve

Other location for circulator

Return Mounted
(122 °F (50°C), 131°F (55°C), 140°F (60°C) elements)

Circulator

When the VTC is piped on the supply
side out from the heat source, the valve
will begin to allow water out to the
system when the temperature of the fluid
meets the temperature of the inserted
thermostat element.

The VTC valve, when placed on the return
side will open when the minimum return
temperature of the element is reached.
When the fluid temperature reaches
18°F (10°C) higher than the element’s
temperature, the return port from the
system will be fully open.

Technical Specifications:

Max. system pressure 145psi (10 bar)

Max. medium temperature 230°F (110 °C)

Min. medium temperature 32°F (0°C)

Fully open temperature differential 18°F (10°C) higher than temperature element

Max. differential pressure across:

B - AB & A - AB 14.5psi (1 bar)

B (О)

AB( )

Max. leakage rate

A(∆)

B - A 4.35psi (0.35 bar)

A - AB 1% of Cv

B - AB 3% of Cv

Allowable medium Closed loop system, Glycol mixture up to 50%

VTC
valve

Other location for circulator

2 | © Danfoss | 02/2022

AI000086403224

AI000086403224

© Danfoss | 02/2022 | 3