Xylem MOH2 Multi zone mixing module (obsolete) Bedienungsanleitung PDF herunterladen (Seite 19)

Installation and operation manual MOH2

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Changing out the circulator

Preparation

• Caution: only a properly licensed electrician should disconnect and

reconnect the circulator.

• Remove electrical power even if you only want to clean the circulator

and not remove it.

• Close the ball valves 10 and 11 on the boiler feed and return side

• Connect the drain hose to the lower drain valve 13. In this way, the

check valve 7 will close automatically and the manifold will not drain

completely.

• Make sure that the drain hose can drain below the level of the circulator

pump

Draining of the water

• Open the drain valve 13

• When all water has drained, loosen the upper pump mounting screw to

allow air entry.

• Drain an additional 1/4 liter.

• Now the water should be below the level of the pump

Changing the circulator

• Remove both pump mounting screws.

• Take care when removing the pump since the rotor is only sitting loosely

on the ceramic ball and can fall out. Tilt the wiring end downward slightly

to prevent this.

• After removing the drive unit you can remove the rotor and clean it if

necessary.

• If the rotor have scratches in the lower part, the bearing has run out and

a new drive unit needs to be installed

• Have a properly licensed electrician disconnect the old circulator and

reconnect a new one.

• Before reassembly, carefully clean the seal ring and the housing.

• Reinsert the drive unit and tighten the two pump mounting screws

Restarting the system

• Refill unit by connecting the drain hose to a faucet. The air will bleed

through the automatic air purger.

• Open the valves on the boiler feed and return side

• Re-energize the unit

• The unit should be ready for operation

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Xylem MOH2 Multi zone mixing module (obsolete) Bedienungsanleitung Seite 19