Xylem MOH2 Multi zone mixing module (obsolete) - Manual (Page 11)

11
Installation and operation manual MOH2
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Connection of the controls
For the connection of controls, the MOH2 base module has 4 positions
for thermal sensors [see sketch on page 2]
• Floor heating feed temperature for control and display [wet sensor]
• Floor heating feed temperature for safety control [dry sensor]
• Floor heating return temperature [wet sensor]
• Boiler feed temperature [wet sensor]
Installation of wet sensors
• The sensors are directly in contact with the water. This results in fast
reaction and accurate temperature sensing.
• Installs the wet sensors before filling the system.
• Insert the sensors and tighten them with the compression fitting.
Installation of dry sensors
• The temperature is read through the wall of the base unit.
• Insert the sensors in the appropriate sensor holes
• Make sure that the sensors are held securely in place. If necessary,
use silicone grease or heat conducting paste to fix them.
• Do not squeeze the sensors under any circumstances.
Electrical connection of thermal drives, sensors and circulator
• If your ordered your station with controls, the electrical installation will
have been completed already.
• If the control has been ordered separately, the sensors and the thermo-
electric drive will already be connected to the control. Only the pump
will have to be wired. Observe the installation manual of the control.
• Route all wires to avoid mechanical stress and ensure that they will be
out of the way of anyone operating the station.
Bypass valve 6
Application
• The bypass valve is only needed when the mixing module MOH2 is
operated in conjunction with a step-down control, since the step-down
control derives its outside temperature information from the boiler feed
temperature.
• For all other control methods, this valve remains closed. [Turn clockwise
to full stop]
• The bypass forms of small connection between the boiler feed and return.