VOKERA Linea Service Manual download pdf (Page 4)

Linea

1.1 PRINCIPLE COMPONENTS

●●

● A fully integrated electronic control board fea-

turing electronic temperature control, anti-cy-

cle control, pump over-run, self-diagnostic fault

indicator, full air/gas modulation.

●●

● Low-water-content, copper heat exchanger.

●●

● Electronic ignition with flame supervision

●●

● Integral high-head pump

●●

● Fan

●●

● Expansion vessel

●●

● Analogue pressure switch (PAD)

●●

● Water pressure switch

●●

● Two-stage gas valve

●●

● Pressure gauge

●●

● Safety valve

●●

● Burner Temperature control

1.2 MODE OF OPERATION (at rest)

When the appliance is at rest and there are no

requests for heating or DHW, the following func-

tions are active:

●●

● Pre-heat function – the pre-heat function ena-

bles the appliance to periodically light and main-

tain the temperature of the DHW heat ex-

changer. This “keep-hot” facility enables the

appliance to provide an instantaneous response

to DHW requests.

●●

● 2-stage frost-protection system – the frost-pro-

tection system protects the appliance against

the risk of frost damage. The first stage ena-

bles activation of the pump should the tempera-

ture of the appliance fall to 7

C. The second

stage becomes active when the temperature

has dropped to 3

C. Should the second stage

become active, the appliance will function on

minimum power until it reaches 30

●●

● Anti-block function – the anti-block function ena-

bles the pump and divertor valve actuator, to

be energised for short periods, when the appli-

ance has been inactive for more than 19-hours.

1.3 MODE OF OPERATION (Heating)

When there is a request for heat via the program-

mer/time clock and/or any external control, the

pump and fan are started, the fan speed will

modulate until the correct signal voltage is re-

ceived at the control PCB. At this point an igni-

tion sequence is enabled.

Ignition is sensed by the electronic circuitry to en-

sure flame stability at the burner. Once success-

ful ignition has been achieved, the electronic cir-

cuitry increases the gas rate to 75% for a period

of 15 minutes. Thereafter, the boiler’s output will

either be increase to maximum or modulate to

suit the set requirement.

When the appliance reaches the desired tempera-

ture the burner will shut down and the boiler will

perform a three-minute anti-cycle (timer delay).

When the request for heat has been satisfied the

appliance pump and fan may continue to oper-

ate to dissipate any residual heat within the ap-

pliance.

1.4 MODE OF OPERATION (DHW)

When there is a request for DHW via a hot water

outlet or tap, the pump and fan are started, the

fan speed will modulate until the correct signal

voltage is received at the control PCB. At this point

an ignition sequence is enabled.

Ignition is sensed by the electronic circuitry to

SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE

ensure flame stability at the burner. Once suc-

cessful ignition has been achieved, the electronic

circuitry increases the gas rate to maximum or

will modulate output to stabilise the temperature.

In the event of the appliance exceeding the de-

sired temperature the burner will shut down until

the temperature drops.

When the request for DHW has been satisfied

the appliance pump and fan may continue to op-

erate to dissipate any residual heat within the ap-

pliance.

1.5 SAFETY DEVICES

When the appliance is in use, safe operation is

ensured by:

●●

● A water pressure switch that monitors system

water pressure and will de-activate the pump,

fan, and burner should the system water pres-

sure drop below the rated tolerance.

●●

● A high limit thermostat that over-rides the tem-

perature control circuit to prevent or interrupt

the operation of the burner.

●●

● An analogue pressure switch (PAD) that checks

the operation of the fan and flue thereby allow-

ing safe operation of the burner.

●●

● A safety valve which releases excess pressure

from the primary circuit.

●●

● Burner Temperature control

1.6 OPTIONAL ACCESSORIES

The Linea 7 is suitable for use with a range of

optional accessories that enable enhanced op-

eration and/or applications. These include:

●●

● RC05 remote control – the RC05 remote con-

trol enables the appliance to be controlled, ad-

justed, and monitored from another location or

room. The RC05 can also be used as a room

thermostat or programmable room thermostat.

●●

● External sensor – used in conjunction with the

RC05 the external sensor enables the appli-

ance to automatically adjust its outlet flow tem-

perature in response to the outside tempera-

ture.

Air Intake

Flue Outlet

Fig. 2

NOTE

1 2 3 4 5 6 7 8 9 ... 51 52

Comments to this Manuals

No comments

VOKERA Linea Service Manual Page 4

Comments to this Manuals

Related products and manuals for Water heaters & boilers VOKERA Linea