Ariston NEXT SFT 14 Manuel de l'utilisateur - Page 20
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4. Commissioning
Once the water heater installation has been completed, it is
necessary to commision the appliance as follows:
4.1. Gas supply installation
Inspect the entire installation including the meter, test for
tightness and purge, as described in BS 6891.
4.2. Checking electricity supply
Carry out preliminary checks for earth continuity, polarity,
resistance to earth and short circuit.
Leave the appliance with the front cover fi tted and the mains
electrical supply isolated.
4.3. Lighting the appliance
Ensure that the gas and water isolation valves below the
appliance are open;
Ensure that the gas supply is properly purged as BS 6891;
Open a hot water tap and ensure that all air is purged from the
appliance and the pipes;
Switch on the mains electrical supply, and turn the appliance
on at the On/Off switch;
Turn on a hot water tap;
The appliance will attempt to ignite, should this fail due
to air in the gas pipe, the appliance will lock-out, it will be
neccessary to reset the appliance as explained in Section 2.3
(page 4).
4.4. Setting the gas pressures
20
4.4.1. Supply working pressure check
1. Close the gas isolation valve
2. Loosen screw "b" and attach the pressure gauge connection
pipe into the test nipple.
3. Open the gas isolation valve
4. Activate the appliance by opening a DHW tap.
The supply pressure should correspond to the value
established in relation to the type of gas for which the
appliance is designed.
WARNING!!
Should the working pressure be lower than that indicated
on the Gas Summary Table, DO NOT ACTIVATE THE DEVICE.
(Max. tolerance = 2 bar
5. Switch the appliance OFF by closing the DHW tap.
6. Close the gas isolation valve
7. When the check is over, tighten screw "b" and make sure it
is securely in place
8. Open the gas isolation valve and check for tightness.
4.4.2. Checking the maximum pressure
1.
Close the gas isolation valve
2.
Loosen screw "a" and attach the manometer connection
pipe onto the test nipple.
3.
Open the gas isolation valve
4.
Activate the appliance by opening a D.H.W. tap.
5.
Press the SW3 button (on the P.C.B.), the appliance is
forced to maximum power.
The display will show CH
Default value = 0
6.
The burner pressure should correspond to the value
shown in the "Gas Settings" table. If it does not correspond
adjust the potentiometer P2.
To save the change, press the SW3 button.
7.
To exit, press SW3 and SW2 buttons simultaneously or
press the ON/OFF button.
a
8.
Close the D.H.W. tap.
9.
Close the gas isolation valve
10. When the check is over, tighten screw "a" and make sure
it is securely in place
11. Open the gas isolation valve and check for tightness.
PCB
b
CH and a value from -9 to +9.
SW3
SW2
P2
P1