Xylem MOH2 Multi zone mixing module (obsolete) - Manual (Page 13)

13
Installation and operation manual MOH2
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Presetting knob for control valve 5
Application
• With this knob you can adjust the resistance value of the MOH2 control
valve.
• This controls the maximum amount of water which enters the MOH2
from the boiler loop with the control valve fully open.
• Use this knob to adapt the MOH2 to the heating system and to optimize
the control characteristics.
• It is especially important to adjust the presetting knob correctly if several
MOH2 stations are attached to one boiler loop. This ensures that all
stations will get a sufficient amount of water from the boiler loop.
Setting
• Use the diagram below for setting the presetting knob correctly. It shows
the differential pressure vs. flow rate for the boiler side of the MOH2
including control valve.
• First, determine the amount of boiler water needed during peak heat
demand.
Using this amount of water and the differential pressure available during
peak heat demand, you find the appropriate setting of the knob in the
diagram.
• Close the presetting knob completely [turn right until full stop]. Open
counter clockwise the number of turns shown in the diagram.
Resistance curve presetting knob