VOKERA Linea Service Manual download pdf (Page 29)

Linea

SECTION 7 CHECKS, ADJUSTMENTS AND FAULT FINDING

7.1 CHECKING APPLIANCE OPERATION

When carrying out any repairs or servicing to the

appliance, the relevant commissioning procedure

must be undertaken to ensure the continued safe

operation of the appliance. Particular attention

should be made to ensure gas soundness, water

soundness, and the electrical integrity of the ap-

pliance.

7.2 APPLIANCE MODE OF OPERATION

NOTE there must be sufficient system water pres-

sure (min. 0.5 bar) to ensure the water pressure

switch is activated. If there is insufficient system

pressure the pump and fan will be prevented from

operating.

7.2.1 SELECTOR SWITCH IN THE OFF POSITION

When the selector switch is in the OFF position,

there is no LED display or LED status indicator.

The divertor valve is in the DHW position. The

appliance will not respond to any DHW or heat-

ing requests.

Active Functions:

●●

● Frost-protection system.

●●

● Pump anti-block.

●●

● Valve actuator anti-block.

7.2.2 SELECTOR SWITCH IN THE HOT WATER

ONLY POSITION

When the selector switch is in the HW only posi-

tion, the status LED is illuminated and the LED

display shows the current temperature measured

at the secondary (DHW) thermistor. The divertor

valve is in the DHW position. The appliance will

respond to any DHW requests.

Active Functions:

●●

● DHW pre-heat.

●●

● Frost-protection system.

●●

● Pump anti-block.

●●

● Valve actuator anti-block.

7.2.3 SELECTOR SWITCH IN THE HEATING & HOT

WATER POSITION

When the selector switch is in the Heating & HW

position, the status LED is illuminated and the

LED display shows the current temperature

measured at the secondary (DHW) thermistor.

The divertor valve is in the DHW position. The

appliance will respond to any Heating or DHW

requests.

Active Functions:

●●

● DHW pre-heat.

●●

● Frost-protection system.

●●

● Pump anti-block.

●●

● Fan anti-block

●●

● Valve actuator anti-block.

7.2.4 APPLIANCE FUNCTIONS

●●

● DHW pre-heat, this function is only active when

there are no requests for heating or hot water.

When the secondary thermistor drops to 35

the pre-heat function is enabled, the appliance

operates on minimum power until the second-

ary thermistor reaches 55

C. Thereafter the

pump and fan will over-run for 10-seconds.

●●

● Frost-protection, this function is only active

when there are no requests for heating or HW.

Should the temperature of the primary thermis-

tor drop below 7

C, the valve actuator will mo-

tor to the heating position, and the pump will be

activated for approximately 20-minutes. Should

the temperature of the primary thermistor ex-

ceed 10

C during this period, the cycle will be

aborted. If the temperature drops below 4

the boiler will operate on minimum power until

the temperature of the primary thermistor

reaches 30

C. Thereafter the pump & fan will

over-run for 30-seconds.

●●

● Anti-block cycle, when there has been no

heating or HW request for 19-hours, the anti-

block cycle is activated. The valve actuator will

motor from the DHW position to the heating po-

sition for a period of 10-seconds and then mo-

tor back to the DHW position. Thereafter the

pump will be activated for a period of 1-minute.

If the selector switch is in the Heating & HW

position, the fan will also be active for 1-minute.

7.2.5 HEATING MODE

With the selector switch in the Heating & HW

position and any additional controls (time clock,

room thermostat, etc,) calling for heat, the appli-

ance will operate in the heating mode. The valve

actuator will motor to the heating position and the

pump and fan will be active. The operation of the

fan causes the analogue pressure switch (PAD)

to deliver a signal voltage to the control PCB. If

the signal voltage is sufficient a slow ignition se-

quence is enabled, whereby the current supplied

to the gas valve modulating coil is progressively

increased from minimum to maximum over a pe-

riod of 8-seconds. During this period the ignition

electrode sparks continuously even if the burner

has ignited.

NOTE

If the spark/sensing electrode does not sense

ignition the appliance will then go to lockout.

Ignition is sensed by the electronic circuitry to

ensure flame stability at the burner. Once suc-

cessful ignition has been achieved, the electronic

circuitry allows 75% 0f the full gas rate through

the appliance. After 15 minutes the gas rate is

increased to maximum (100%).

When the set-point has been reached (the posi-

tion of the heating temperature selector) as meas-

ured at the primary thermistor, the appliance will

begin the modulation phase whereby the fan and

gas valve will continuously modulate to maintain

the set-point.

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VOKERA Linea Service Manual Page 29

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