7. Do the reverse of the above procedure to reassemble the repaired valve. Use a
suitable sealant on the retainer threads and pipe to valve connections.
8. Test to ensure the repaired valve opens and closes properly and does not leak
before putting Therma-Flow
®
Plus into service.
4.6 Freeze and Scald Protection Valves
(Optional)
The freeze protection valve protects the shower and eyewash from freezing. The scald
protection valve works to prevent water from getting to an over-heated temperature
that may harm a potential user of the equipment. These valves should be inspected
each year and cycled before hot or cold weather sets in.
CAUTION: The piping system should be well flushed and clear of any debris.
Small foreign particles may obstruct and prevent closing of the valves.
These are key points about the freeze and scald protection valves:
• The freeze protection valve prevents rupture damage during freezing
temperatures. It must be in a vertical position in order to drain the shower.
• The scald protection valve prevents the water from getting too hot. This
valve will operate in any position.
• Discharge from the freeze protection valve and scald protection valve
should be directed to waste without restrictions.
• The temperature control points for the freeze and scald protection valves are
factory set and sealed (not adjustable). The element is activated by a
temperature change of fluid inside the valve body.
— Freeze protection valves will begin to open at 40°F (4.4°C), and will be fully
open at 35°F (1.7°C). The freeze protection valve is direct-acting and will
close as the fluid warms up.
— Scald protection valves will begin to open at 95°F (35°C), and will be fully
open at 100°F (37.8°C). The scald protection valve is reverse-acting and will
close as the fluid cools down.
NOTE:
Do not attempt to force valve open or clean with pointed object as
scoring of valve seat and disk will create permanent leakage.
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