Viessmann Vitocrossal 300 CU3A, Service Instructions Manual, Page: 4 / 116

Vitocrossal 300 CU3A 26 to 199 Service
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Safety
General Information
Start-up
Safety, Installation and Warranty Requirements ..............2
Product documentation..........................................2
Warranty..............................................................2
Licensed professional heating contractor..................2
Contaminated air...................................................2
Advice to owner....................................................2
Operating and Service Documentation......................2
Carbon monoxide...................................................2
Fresh air..............................................................2
Equipment venting.................................................2
Fiberglass wool and ceramic fiber materials..............3
First aid measures..................................................3
About the Service Instructions ......................................3
Necessary Tools .........................................................6
Important Regulatory and Installation Requirements ........6
Codes..................................................................6
Technical literature................................................6
Initial start-up.......................................................6
Working on the equipment.....................................6
Instructing the system user....................................6
For installations on the Commonwealth of
Massachusetts .......................................................7
CSD-1 Field Testing of High Limit Switches.................
.7
Applicability ..............................................................8
Product Information
....................................................8
Mechanical Room ......................................................9
Filling the Heating System ..........................................10
Removing the Front Panels ........................................11
Filling Siphon With Water
...........................................11
Opening the Control Unit ...........................................12
Check Power Supply Connection .................................12
Start-up Wizard .........................................................13
Select language..................................................13
Set time and date...............................................13
Select temperature unit.......................................13
Set DHW temperature setpoint.............................13
Selecting zone circuits.........................................14
Slecting zone circuit type.....................................14
Select fixed setpoint............................................14
Adjust heating curve............................................14
Select pump output.............................................15
Confirm pump output...........................................15
Zone circuit temperature setting............................15
Weather compensated operation...........................15
Designating Heating Circuits .......................................16
Setting High Altitude .................................................16
Select Gas Type .......................................................17
Convert Fuel Type to LPG ..........................................17
Measuring the Static Pressure and Running Pressure
.....18
Set Maximum Output ................................................19
Check All Primary and Secondary Circuit
Connections for Leaks ...............................................19
Check Gas Pipes and Fittings for Leaks ........................19
Perform Combustion Analysis
.....................................20
Checking the Direct Vent (coaxial) System Tightness... .20
Sequence of Operation and Potential Faults During
Each Start-up Cycle ...................................................21
Vitocrossal 300 CU3A 26 to 199 Service
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