Troubleshooting
29 of 36
IM-HC 561174 1120 Basic Heating Control
5.1 Underheating
Test the contacts, voltages, and sensors. Using a multimeter, ensure
that the control is receiving adequate voltage to the power terminals as
noted in the technical data. Use the multimeter to determine if the internal
contacts on the control are opening and closing correctly. Follow the
instructions in section "4.3 Testing the Wiring" on page 20 to simulate
closed contacts on the terminal blocks as required. Test the sensors as
described in section "4.7.2 Testing Sensors" on page 26.
See below for what to do if the building temperature is incorrect.
If the building is too cool during cold weather, this indicates that the
upper portion of the programmed heating curve is too low, or that the
supply water high limit (MIX MAX) has been reached. If the supply
temperature is close to MIX MAX, then this setting must be increased
to provide more heat (if possible without damaging floors). Otherwise
increase the MIX DSGN temperature, which will increase the supply water
temperature (by increasing the slope of the heating curve).
If the building is too cool in warm weather, increase the value of the
ROOM setpoint in the Adjust menu. This will shift the heating curve up to
provide higher water temperatures.
5.2 Overheating
If the building is too warm during cold weather, decrease the value of
the MIX DSGN setting in the Adjust menu. This will reduce the slope
of the heating curve, providing less heat to the building at low outdoor
temperatures.
If the building is too warm during warmer weather, reduce the value of
the ROOM setpoint in the adjust menu. This will shift the heating curve
downward to reduce water temperatures.
Summary of Contents for IM-HC 561174 1120
Page 1: ...Installation Manual Viega Basic Heating Control ...
Page 2: ......
