A.O. Smith GWV - 120 User Manual

90

Instruction manual GWV

s

6. Switch the electronic controller ON by setting the On/Off switch to position I.

The display will now show INTERNAL CHECK for about 10 seconds and 
go to the main menu.

7. Activate the 'ON mode' by going through the following steps:

-

Press the blue arrow once ( ) to position the cursor in front of ON and 
press . 

-

Confirm the START OPERATION by pressing 

.

8. If there is no heat demand, increase Tset

. Note the original setting. If there is no demand, draw some 

hot water off to create demand.

9. Check whether the heating cycle runs correctly

. 

10. If you have adjusted T

set 

, return it to the original value

11. Carefully remove the sheeting from the front of the appliance.
12. Check the supply and burner pressures

 and adjust these where necessary.

13. Check that all components of the flue gas system are properly attached.
14. Check the pressure differential across the orifice plate of the pressure switch 

(see the table). If the pressure difference is too low, the flue gas outlet and 
air supply should be checked for blockages.

15. Test the operation of the overflow valve of the protected cold supply set-up. 

The water should spurt out.

16. Test the overflow operation of the P-valve. The water should spurt out.
17. Check the drainage pipes from the discharge points of all valves and remove 

any scale deposits that may be present.

18. Drain

 the appliance.

INTERNAL CHECK

MENU

 »OFF

^ ON

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GWV 120

> 66

GWV 150

> 75

GWV 200

> 92