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3. Remove the Venturi unit.
4. Replace the Venturi unit with the Venturi unit provided in the conver
sion kit.
5. Remount the connection pipe to the gas valve.
Tab.28 Torque
R
Reference
Model
Fastening Venturi end
Fastening gas valve end
A
POWER HT+ 1.50
Clip
G1” nut, Torque: 40 N·m
B
POWER HT+ 1.70
POWER HT+ 1.90
POWER HT+ 1.110
Nut, Torque: 40 N·m
Nut, Torque: 40 N·m
6. Open the mains gas valve.
7. Check the tightness of the assembly and ensure that there are no
leaks.
8. Set the gas valve according to the parameters given in the conver
sion kit manual.
9. Set the fan speed according to the new gas type.
See
CO2 checking and setting values, page 62
10. Set the air/gas ratio.
See
Setting the air/gas ratio (maximum thermal flow rate), page 59.
Setting the air/gas ratio (reduced thermal flow rate), page 61.
11. Replace the gas setting label with the one delivered with the boiler
and tick the corresponding gas setting.
7.5 Checks and adjustments after commissioning
7.5.1 Configuring an installation with 1 1 low-loss header
+ 1 direct c 1 underfloor heating c domestic hot water
tank
See
Connection diagram: 1 1 direct c 1 underfloor
heating c 1 domestic hot water tank, page 34.
Electrical connection: 1 1 direct c 1 underfloor
heating c domestic hot water tank, page 52.
1. Go to the installer parameters.
See
Modifying the installer parameters, page 68.
2. Set following parameters on the boiler:
Tab.29 Boiler settings
Parameter number
Parameter
Setting
5715
TTemps / mode CH2
On
6020
FFunction extension module 1
Temps / mode CH2
6024
FFunct input EX21 module 1
Limit thermostat CH
Fig.69 Removing the Venturi unit
MW
-3000049
A
B
3
3
7 Commissioning
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