ECO ULTRA Electric Boiler
Installation, Use and Care Manual
(Revision June 2017)
, Page
37.
OPERATING THE WATER HEATER WITH
A THERMOSTATIC MIXING VALVE
A thermostatic mixing valve provides for
automatic operation through the use of a
thermostatic element inside the valve. The
element will control the mixing of the hot and cold
water supply streams to provide a safe blend to
connected fixtures. This provides constant water
temperature under different working conditions.
When using models which are certified ASSE
1017 and, in addition, have successfully passed
the cold water supply failure test (ASSE 1016),
loss of either hot or cold water to the thermostatic
mixing valve will result in a reduction in flow from
the valve to less than .5 GPM within seconds of
the loss. Pressure difference between Hot and
Cold ports should not exceed 10 psi. Valves
require a minimum difference of 20°F between
the Hot and Mixed temperature for proper
operation.
To set the thermostatic mixing valve carefully
open a hot water tap. Protect yourself against the
risk of scalding. Use a thermometer and measure
hot water temperature form the faucet. Reduce
or increase the hot water temperature by
adjusting the valve knob to the proper position.
Lock the knob at the set temperature. Refer to
the valve manufacturer’s manual to get the proper
guidelines.
By mixing domestic cold water to the hot water
supplied by the heater, the thermostatic mixing
valve allows the boiler to work at higher
temperature range. Thus boiler water stored
inside the Eco ULTRA tank acts as a buffer which
increases boiler efficiency and the amount of
domestic hot water produced by the heater.
To increase hot water production and storage
capacity set the UltraSmart controller at a higher
temperature (from 140°F to 180°F). And
secondly set the thermostatic mixing valve at the
desired temperature (from 90°F to 120°F).
For sanitation
purposes use a different
temperature range or install a dedicated hot water
line to the equipment.