Thermaflow TH12 - Page 3

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2.7 Commissioning .............................................................................................21
2.7.1 Filling domestic water circuit...................................................................21
2.7.2 Filling the heating system.......................................................................21
2.7.3 Domestic hot water flow rate ..................................................................22
2.7.4 Temperature settings..............................................................................22
2.7.5 Heating system commissioning..............................................................22
2.7.6 Completion .............................................................................................23
Instruct the user...............................................................................................23
Part 3 - SERVICING .................................................................................................24
3.1. Fault Finding ................................................................................................24
Fault: No domestic hot water or central heating..............................................25
Fault:No central heating, but hot water at taps................................................26
Fault:CENTRAL HEATING BUT No hot water at taps ....................................27
3.2 ISOLATION ...............................................................................................28
Checking the pressure in the expansion vessel ..............................................28
Checking the inline strainer .............................................................................28
Checking the hot water blending valve............................................................28
Checking the concentration of corrosion inhibitor............................................29
preventing pump seizure in summer ...............................................................29
Checking correct operation of electrical components......................................29
Low pressure switch........................................................................................29
control and high limit thermostats....................................................................29
Checking the elements....................................................................................30
Checking circuit breakers ................................................................................30
Checking the contactor....................................................................................30
Check the operation of the AQUA STAT.........................................................30
Appendix I – Solar Connection..............................................................................31
A1.1 Solar Pipework Schematic ......................................................................31
A1.2 Solar Wiring Schematic...........................................................................32
IMPORTANT PRE-INSTALLATION NOTES
• Power supply and wiring
The power supply to the premises must meet the minimum requirements of the unit being installed, with special
attention given to the supply current, cable size and MCB recommendation. The supply voltage to the appliance
must never drop below 207 Volts.
Important
The electrical supply requirements:-
The 9 KW and 12 KW boilers meet the requirements of EN 610000-3.3
The 9 KW and 12 KW boilers must be installed in premises having a service supply of ≥ 100A
per phase.
The 12 KW boiler must be installed in premises having a system impedance of not more than 0.1939 + J 0.1939Ω