Viessmann Vitocrossal CRU Series Installation Instructions Manual page 16

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Connections on the heating water side

2. Connect the hydraulic lines.

System with 1 heating circuit:

Connect the heating return to boiler return 1.

■

System with 2 heating circuits:

■

Connect the heating circuit with the higher tem-

perature level to boiler return 2.

Connect at least 15 % of the rated heating output

■

to boiler return 1.

Please note

Mechanically loaded hydraulic connections

lead to leaks, vibrations and appliance dam-

age.

Connect on-site lines so that they are free of

load and torque stress.

(cont.)

3. Seal any unused connections.

Note

Never connect a heat consumer to connector

(safety connection).

4. Check the hydraulic connections for tightness.

Please note

Unsuitable water quality can damage the

boiler body.

Only fill the boiler with water that complies

with the "Water quality requirements": See

"Vitocrossal, type CRU" service instructions

5. Thermally insulate the hydraulic lines.

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