VOKERA Linea Service Manual download pdf (Page 31)

Linea

Fig. 43

7.4 COMBUSTION ANALYSIS TEST

A combustion analysis check can easily be car-

ried out on the appliance via the test points lo-

cated on the top of the appliance, however you

must check that the burner pressures are set cor-

rectly (see 7.3).

●●

● Insert the flue gas analyser probe into the right

hand test point (see fig 43).

●●

● Locate and remove the protective cap that con-

ceals the ‘CO mode’ button (see fig. 43).

●●

● Light the boiler as described in 5.7 and press

the ‘CO mode’ button once.

●●

● The boiler will now enter the combustion analy-

sis mode (CO mode) for a period of 15 min-

utes. During this time it will remain on full gas

and ‘CO’ will be displayed on the LED display.

●●

● Once the flue gas analysis has been made,

press the ‘CO mode’ to resume normal opera-

tion.

7.5 CHECKING THE EXPANSION VESSEL

Carry out the component removal procedure as

described in 6.4. You must ensure that the boiler

is completely drained of water.

Using a suitable pressure gauge, remove dust

cap on expansion vessel and check the charge

pressure. The correct charge pressure should be

1.0 bar ± 0.1 bar.

If the charge pressure is less, use a suitable pump

to increase the charge.

NOTE

You must ensure the safety valve is in the open

position whilst re-charging takes place. Replace

the dust cap and carry out the relevant commis-

sioning procedure (section 5).

7.6 EXTERNAL FAULTS

Before carrying out any faultfinding or component

replacement, ensure the fault is not attributable

to any aspect of the installation.

7.6.1 INSTALLATION FAULTS

Symptom Possible causes

No ignition Check wiring

Check electrical supply

No hot water Check hot/cold pipe

work is not reversed

No central heating Check wiring of time clock

and/or room thermostat

Fault code Possible causes

01 Gas supply problem

Gas line requires purging

Reversed polarity

Broken, internal flue joint

02 Flow/return valves closed

Stuck pump

03 Debris in flue system

Debris in flue venturi

04 Insufficient water pressure

Air in boiler

7.7 ELECTRICAL CHECKS

Any electrical checks must be carried out by a

suitably qualified person.

7.7.1 EARTH CONTINUITY TEST

Isolate the appliance from the electrical supply,

and using a suitable multi-meter carry out a re-

sistance test. Connect test leads between an

appliance earth point and the earth wire of the

appliance supply cable. The resistance should

be less than 1 OHM. If the resistance is greater

than 1 OHM check all earth wires and connec-

tors for continuity and integrity.

7.7.2 SHORT CIRCUIT CHECK

Isolate the appliance from the electrical supply,

and using a suitable multi-meter, carry out a short

circuit test between the Live & Neutral connec-

tions at the appliance terminal strip (fig.16).

Repeat above test on the Live & Earth connec-

tions at the appliance terminal strip (fig.16).

NOTE

Should it be found that the fuse has failed but no

fault is indicated, a detailed continuity

Check will be required to trace the fault. A visual

inspection of components may also assist in lo-

cating the fault.

7.7.3 POLARITY CHECK

With the appliance connected to the electrical

supply and using a suitable multimeter, carry out

the following voltage tests:

Connect test leads between the Live & Neutral

connections at the appliance terminal strip

(fig.16). The meter should read approximately

230V ac. If so proceed to next stage. If not, see

7.7.4.

Connect test leads between the Live & Earth con-

nections at the appliance terminal strip (fig.16).

The meter should read approximately 230V ac.

Protecting

cap

Air analysis outlet Fumes analysis outlet

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VOKERA Linea Service Manual Page 31

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