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 noncondensing 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
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* Valve body and thermostat sold separately. Order one valve body and |
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Ordering Information: |
VTC Valve Body, Without Thermostat* one temperature element to assemble a complete valve |
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Code No. |
Series |
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Valve Size |
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Connection |
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193B1701 |
VTC511 |
16.2 |
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1-1¼” |
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FNPT |
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Internal VTC Temperature Element |
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Code No. |
Series |
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Typical Application |
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193B1702 |
122°F (50°C) |
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193B1703 |
131°F (55°C) |
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Return line boiler protection |
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193B1704 |
140°F (60°C) |
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193B1709 |
149°F (65°C) |
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193B1705 |
158°F (70°C) |
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Boiler outlet, storage tank feed |
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193B1706 |
176°F (80°C) |
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Spare Parts |
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Code No. |
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Description |
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98060150 |
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O-ring for brass plug |
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AI000086403224 |
© Danfoss | 02/2022 | 1 |
ESBE VTC 511 3-Way Thermic Valve Datasheet |
ESBE VTC 511 3-Way Thermic Valve Datasheet |
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Valve Selection: |
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Piping Orientation: |
Supply Mounted |
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(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
VTC valve
Technical Specifications: |
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Max. system pressure |
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145psi (10 bar) |
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Other location for circulator |
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Max. medium temperature |
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230°F (110°C) |
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Min. medium temperature |
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32°F (0°C) |
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Fully open temperature differential |
18°F (10°C) higher than temperature element |
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Max. differential pressure across: |
B - AB & A - AB |
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14.5psi (1 bar) |
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B (О) |
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AB( ) |
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B - A |
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4.35psi (0.35 bar) |
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A(∆) |
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Max. leakage rate |
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A - AB |
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1% of Cv |
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B - AB |
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3% of Cv |
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Allowable medium |
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Closed loop system, Glycol mixture up to 50% |
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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.
2 | © Danfoss | 02/2022 |
AI000086403224 |
AI000086403224 |
© Danfoss | 02/2022 | 3 |
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