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Viega Hydronic Mixing Block User Guide
UG-HC 566234 0720 Hydronic Mixing Block
Testing the Hydronic Mixing Block
When piping is complete, test the Hydronic
Mixing Block and system piping.
1
Ensure air vent cap is tight before testing.
2
Pressurize the system to a maximum of 100
psi for one hour.
3
Once the system maintains 100 psi for one
hour, carefully remove air pressure from the
system and fill with fluid.
Purging
When testing is complete, purge the Hydronic
Mixing Block.
1
Shut the power off to the boiler.
2
Purge with cool water only. If the boiler is hot
it should be cooled down prior to purging
in order to protect the floor coverings from
surface temperatures above 85°F.
3
Plug in the Hydronic Mixing Block. Allow it to
run through its power on sequence and bring
you to the STATUS screen.
4
From the STATUS screen, push the middle
rectangular button.
5
DEFAULTS/PURGE.
6
Select PURGE.
7
Select ACTIVATE.
■
Selecting ACTIVATE will cause the screen
to turn purple, at which time the internal
valve will open. Once the valve is open,
the screen will blink purple and start a 30
minute timer to allow for purging.
■
If more time is needed, ACTIVATE may be
selected as many times as necessary to
complete system purging.
■
If less time is needed, purge can be
cancelled by selecting CANCEL.
8
Allow the Hydronic Mixing Block to be filled
with fluid from the supply side piping.
9
Close the valve on the return piping to the
boiler.
10
Open the purge valve to allow trapped air to
be eliminated.
11
Continue to allow fluid to run into the block
and out the purge valve until all air is removed
from the system.
12
Once purging is complete, return all valves to
normal operating position.
13
Open the air vent cap to allow air to escape
under normal operation.
14
Once the Hydronic Mixing Block, boiler,
and piping have been purged and properly
pressurized, restart the boiler.
Testing the Sensors
Outdoor Sensor / Boiler Sensor
1a
Outdoor Sensor
■
Use a thermometer to read the outdoor
temperature.
1b
Boiler Sensor
■
Use an infrared or digital thermometer
to read the temperature where the boiler
sensor attaches.
2
Using an ohm meter capable of measuring
10kΩ, measure the resistance present at the
sensor.
3
Using the “Sensor Resistance Chart” on page
18, compare the measured temperature/
ohm reading to what is in the chart. If reading
is off by ± 5%, the sensor is bad.
Do not apply voltage to the sensors
as this will damage them.