Rinnai E75CN Instructions D'installation Et De Service page 28

6.5.2
DHW piping with thermostatic mixing valve
DANGER
28
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Installing a Thermostatic Mixing Valve
A thermostatic mixing valve should be installed on all E combi boilers on the domestic
hot water side to prevent scalding. This valve will regulate the water temperature
leaving the brazed plate heat exchanger. See the figure 10 for the suggest piping.
Hot water can be dangerous, especially for infants or children, the elderly,
or infirm. There is hot water scald potential if the thermostat is set too high.
Water temperatures over 125º F (51º C) can cause severe burns or
scalding resulting in death.
Hot water can cause first degree burns with exposure for as little as:
3 seconds at 140º F (60º C)
20 seconds at 130º F (54º C)
8 minutes at 120º F (48º C)
Test the temperature of the water before placing a child in the bath or
shower.
Do not leave a child or an infirm person in the bath unsupervised.
fig. 10