Xylem MOH2 Multi zone mixing module (obsolete) - Manual (Page 14)

14
Installation and operation manual MOH2
www.lainginc.com
Filling the system
Preparation
• Close the ball valves 10 and 11 at the boiler feed and return of the
MOH2 mixing module.
• Open the feed valve and return flow adjuster of the left most floor heating
loop directly adjacent to the fill- and drain valves 12 and 13
• Close the feed valves and return flow adjusters of all other floor heating
loops.
Filling of the boiler loop
• Fill the boiler loop as usual. No special precautions are necessary.
Filling of floor heating loops
• Connect the fill hose to the upper fill valve 12.
• Connect the drain hose to the lower drain valve 13.
• In this way, the built in check valve 7 at the floor heating feed side will
close and the water will run through the floor heating loops.
• Flush the first loop until it is completely free of air.
• Close the first loop and open the next loop going from left to right.
Repeat until all loops have been flushed.
After filling
• Open the valves 10 and 11 of the boiler loop
• Open all floor heating loops
Verification of proper filling
• Shut down the heating system or set the boiler temperature to ambient
• Switch on the boiler circulator and the circulator of the mixing module
• Open the control valve. Remove the valve cover to do so if necessary.
• You should hear very few air noises, which should get less over time.
• If the air noises do not decrease but persist or even increase, is
necessary to repeat the air purging as described above.
Pressure test
Preparation
• Open all feed valves of the floor heating loops.
• Close the ball valves 10 and 11 [which connect the module to the boiler
loop]
• Close all return flow adjusters of the floor heating loops.
• Connect the pressure hose to the fill valve 12.