Thermo Products COMBOMAX Models from 8 kW to 24 kW : 240 Volts ( single phase ) - Manual (Page 12)

COMBOMAX MC Electric boiler Set-up, use and care guide (revised January 2006) , Page 12.
4.6 ADJUSTING THE MIXING VALVE
A thermostatically controlled mixing valve works
automatically thanks to the thermostatic element
controlling the mix of very hot and cold water as
required to provide safe domestic hot water
under variable conditions.
To adjust the mixing valve setting, carefully open
a hot water tap. Protect yourself against the
possibility of scalding. Measure the hot water
temperature and adjust it with the mixing valve,
following the manufacturer’s instructions. Lock
the adjusting valve in place at the proper setting.
A higher boiler water temperature setting is now
possible thanks to this moderating effect. The
boiler water in the COMBOMAX
MC
tank acts as a
buffer and increases the boiler efficiency as well
as the amount of domestic hot water produced.
To increase the ad hoc or general hot water
production capacity, first adjust the domestic hot
water priority aquastat setting (e.g., from 140°F
to 180°F), then the mixing valve setting (e.g.,
from 90°F to 120°F).
Some sanitary uses may require different setting
ranges or dedicated piping.