Freeze Protection Valve
To test and clean the freeze protection valve:
1. Switch off the electrical power supply.
2. Close the water supply.
3. Relieve pressure and water from the system by opening the eyewash or shower.
4. Carefully remove the locking-ring that holds the freeze protection valve and
remove the unit.
5. Place the valve in ice water. The ice water should be at a temperature below
35°F (1.7°C). Submerge the valve for 15 to 20 minutes. The freeze protection
valve should be fully open at the end of this period. If it does not fully open,
replace the defective valve.
6. If the valve opens, remove it from the ice water and clean it by forcing compressed
air 40 PSI (278 kPa) - 50 PSI (345 kPa) through the inlet side of the valve for two
(2) to three (3) minutes (see the nameplate for flow direction).
7. Place the freeze protection valve in warm water, 70°F (21.1°C) - 80°F (26.7°C),
for 10 to 15 minutes.
8. Remove the valve from the warm water and attempt to force compressed air
60 PSI (414 kPa) through the inlet of the valve. No passage of air ensures the
valve seat is closed and the valve is functioning properly.
9. With air connected to the valve, submerge the valve in a warm water bath to check
for leakage. If bubbles appear repeat the cleaning process Steps 6 through 8 and
retest the valve in the water bath.
10. If after two rounds of cleaning the valve continues to leak, replace with new valve (see
“6. Spare Parts” on page 6-1). To replace, follow the reverse order of removal.
11. Open the water supply and ensure no leaking occurs.
12. Switch on the electrical power supply to the Therma-Flow
®
Plus.
Scald Protection Valve
WARNING:
Wear protective equipment during
this hot
water
test.
Contact
with
water
as hot as
100°F (37.8
°C) can
scald human
skin.
To test and clean the scald protection valve:
1. Switch off the electrical power supply to the Therma-Flow
®
Plus.
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