336 Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Chapter 5 Component Definition and Maintenance
Figure 280 - Thermostatic Valve Replacement
Repair Instructions - Element Testing
Place element in water at a temperature 8 °C...1 °C (15 °F...2 °F) above its nominal
setting and stir water vigorously with the element for five minutes. The
temperature stamped on the side of the element is not the nominal temperature;
it is the temperature at which the element is set to open. The stamped
temperature is usually 6...8 °C (10...15 °F) higher than the nominal. After stirring
vigorously, immediately place the element in the housing. If the element is fully
stroked, the seating and over-travel spring can be felt as it is pushed down. To
determine if the element will close at a specific temperature, place the element in
a bath of water approximately 3 °C (5 °F) below the start to open temperature.
This is the number stamped on the element. Due to the effect of hysteresis, the
element will close 3 °C (5 °F) below the start to open temperature.
Element Replacing
Refer to Figure 281.
1. Remove four cap screws, lock-washers and separate upper housing and
lower housing.
2. Remove element assembly and seal.
3. Remove housing gasket. Clean housing sections and remove any scale or
foreign material from seal faces.
4. Lubricate the new element seal and slide it in place over top of the element
assembly into position shown in section view.
5. Place new housing gasket in recess of upper housing.
To Heat Exchanger
TV1-C
Thermostatic Valve Housing TV1
TV1-B
TV1-A
V10
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