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Viega Hydronic Mixing Block User Guide
UG-HC 566234 0720 Hydronic Mixing Block
Wiring
Connecting to the Wiring
Terminal Block
All wiring shall be done through the wiring
terminal block. The wiring terminal block has 9
terminals and should be connected as follows:
■
Terminal 1,2 - Thermostat or end switch
(terminal 1 and 2 can accept a dry contact or
24v powered contact).
■
Terminal 3,4 - Outdoor Sensor.
■
Terminal 4,5 - Boiler Sensor.
■
Terminal 6,7 - Boiler Contact (TT) relay rated
for 24V AC 1.0 Max AMPS.
■
Terminal 8,9 - Internal relay rated for 24V AC
1.0 Max Amps. With the addition of a pump
and boiler relay this contact can be used for
low head primary loop pump control.
Plug cord into 120V AC - standard wall outlet
(altering the cord will void the warranty).
End Switch from Zone
Control or Thermostat
(Dry or Powered contact)
Pump
and
Boiler
Relay
120 VAC
Power
Supply
Primary Loop
Pump P1
24
VAC
Com
Boiler Sensor
S1
Boiler
Hydr
onic Mixing Block
