Installing A Thermostatic Mixing Valve - Rinnai E75CN Installation & Servicing Instructions Manual

6.5.2
Cold water
Sediment filter
MRIK-T kit
(MRIK-T 3/4" threaded connection)
MRIK-S kit
(MRIK-S 3/4" sweat connection)
DHW piping with thermostatic mixing valve

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.
Mixed water
to fixtures
Thermostatic
mixing valve
DANGER
P
Low Loss Header
T
System Supply System Return
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.
Shut off valve
DHW Pressure
Relief Valve
Drain valve
fig. 10
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