13 of 20
Viega Hydronic Mixing Block User Guide
UG-HC 566234 0720 Hydronic Mixing Block
Boiler Settings
■
TYPE: RESET — This setting allows for the
boiler to change supply water temperature
based on outdoor temperatures. Default is
set to: RESET.
■
BOILER DESIGN — The water temperature
needed on design day.
Range: 70°F to 200°F
Default: 180°F
■
BOILER MIN — Lowest temperature the
boiler is allowed to supply. This temperature
needs to be set high enough for the
boiler to be able to maintain mixed water
temperatures.
Range: 70°F to 200°F
Default: 140°F
■
BOILER DIFF — Determines turn on and
shut off temperatures. This setting will allow
the boiler to go above the boiler target by
half of this setting. Example: if the BOILER
DIFF is set at 20°F, the boiler will run until the
temperature is 10°F above the boiler target
setting and turn on when the temperature is
10° below the boiler target temp.
Range: 10°F to 50°F
Default: 20°F
■
TYPE: AQUASTAT — Used when the boiler
is a non-condensing boiler that maintains its
own temperature settings. This mode is not
available with CONSTANT circulation mode.
■
SENSOR — Installed on either SUPPLY
or RETURN. Installation must be properly
identified in this setting.
■
SUPPLY MIN/RETURN MIN — Minimum
supply/return temperature.
Range: 70°F to 200°F
Default: 140°F
■
TYPE: CONDENSING — Used when the
boiler is a condensing boiler that maintains
its own temperature settings.
