VOKERA Hydra User Instructions

Users
Instructions

THESE INSTRUCTIONS
TO BE RETAINED
BY USER

Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

01274 488 388

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2

Dear Customer

Your Vokera Hydra boiler has been designed to meet and exceed the very latest standards in gas central heating
technology , and if cared for, will give years of reliable use and efficiency.
Please therefore take some time to read these instructions carefully .

Do’s and don’t’ s

● Do ensure that the system pressure is periodically checked

● Do ensure that you know how to isolate the appliance in an emergency

● Do ensure that you are familiar with the appliance controls

● Do ensure that your installer has completed the appliance log book

● Do not attempt to remove the appliance casing or gain internal access

● Do not hang clothes etc. over the appliance

● Do not forget to have the appliance serviced annually.

Contents

Introduction Page

Dear customer 2
Do’s and don’t’s 2

Things you should know Page

1.1 Gas appliances 3

1.2 Electrical supply 3

1.3 Guarantee registration card 3

1.4 Benchmark log book 3

1.5 How does it work? 3

1.6 Dimensions 3

1.7 Clearances required 3

1.8 Frost protection system 3

1.9 Additional controls 3

Getting started Page

2.1 Before switching on 3

2.2 Appliance controls 3

2.3 Lighting the boiler 4

2.4 Adjusting the operating temperature 4

2.5 Digital display 5

2.6 Fault code table 5

How to... Page

3.1 Top-up the system pressure 6

3.2 Reset the appliance 6

3.3 Shut down the system for short periods 6

3.4 Shut down the system for long periods 6

3.5 Care for the appliance 6

3.6 Regulate the hot water temperature 6

What if... Page

4.1 I suspect a gas leak 7

4.2 I frequently have to top-up the system 7

4.3 The status led is red 7

4.4 The appliance is due its annual service 7

4.5 I need to call an engineer 7

Setting the Vokera Page

5.1 Mechanical clock 8

5.2 Digital clock 8

INTRODUCTION

Fig. 1

1= hot water selection
2= increase button
3= mode button
4= digital display
5= hot water LED
6= status LED
7= heating LED
8= reset button
9= decrease button
10= heating selector
11= clock aperture
12= pressure gauge

1

2

3

4

6

8
9

10

11

12

5

7

Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

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3

THINGS YOU SHOULD KNOW

1.1 GAS APPLIANCE
Gas Safety (Installations and Use) Regulations.

In the interests of your safety and that of others it
is a legal requirement that all gas appliances are
installed and correctly maintained by a competent
person and in accordance with the latest
regulations.

1.2 ELECTRICAL SUPPLY

Please ensure that this appliance has been
properly connected to the electrical supply by
means of a double pole isolator or un-switched
socket, and that the correct size of fuse (3 amp)
has been fitted.

Warning: this appliance must be earthed!

1.3 GUARANTEE REGISTRATION CARD

Please take the time to fill out your guarantee
registration card. The completed warranty card
should be posted within 30 days of installation.

1.4

BENCHMARK

LOG BOOK

The

Benchmark

Log Book is supplied with your
boiler. This important document must be
completed during the installation/commissioning
of your boiler. All CORGI Registered Installers
carry a CORGI ID card and have a registration
number. Both should be recorded in your

Benchmark

Log Book. You can check your
installer by calling CORGI direct on 01256 372300.
Failure to install and commision the appliance in
accordance with the manufacturers instructions
may invalidate the warranty. This does not affect
your statutory rights.

1.5 HOW DOES IT WORK?

Your Hydra boiler is a high efficiency combination
boiler, which supplies heated water to your
radiators and hot water to your taps.
The central heating is controlled via a time clock
and/or any thermostats that your installer may
have fitted. The boiler will light when a hot water
outlet (a tap) is opened. The boiler also functions
periodically to pre-heat the hot water heat
exchanger. The Hydra boiler lights electronically
and does not have a pilot light. In the unlikely
event of a fault developing with your boiler, the
supply of gas to the burner will be terminated
automatically.

1.6 DIMENSIONS

HEIGHT

WIDTH
DEPTH

820 mm
450 mm
355 mm

1.7 CLEARANCES REQUIRED

ABOVE

BELOW

SIDES

FRONT

150 mm
120 mm

25 mm

600 mm

1.8 FROST PROTECTION SYSTEM

The Hydra is equipped with a built-in frost
protection system, this enables the boiler to over­ride the time controls – if switched off – and
operate the burner and/or pump, should the
temperature drop below 7

°

C.
Please note that the frost protection system is
designed to protect the appliance only, should
frost protection be required for the central heating
system, additional controls may be required.

NOTE

The frost protection system is reliant on the
appliance having a permanent electrical supply,
and being in a non-fault condition.

1.9 ADDITIONAL CONTROLS

Additional controls such as an external tempera­ture sensor kit or under floor heating safety
thermostat are available as optional accessories
for this appliance. Y ou should consult your installer
and/or the supplementary instructions supplied,
on their use (if installed).

GETTING STARTED

2.1 BEFORE SWITCHING ON

Before switching the appliance on please
familiarise yourself with:

● how to isolate the appliance from the gas,

water, and electricity supplies;

● how to check and top-up – if necessary – the

system water pressure;

● the time clock;

● any external thermostats and their functions;

● the appliance controls.

2.2 APPLIANCE CONTROLS (fig. 1)

The appliance controls are concealed behind the
front cover. To gain access to the controls simply
press the cover inwards to release the catch. The
appliance is equipped with a simple keypad that
can be used to alter the following function:

● the outlet flow temperature to the central heating

system;

● the outlet flow temperature for domestic hot

water
The pressure gauge shows the current pressure
of the system, the gauge should be set between
1 and 1.5 bar. When the appliance is operating
the gauge may rise or fall slightly, this is quite
normal. The minimum permissible level for the
safe and efficient operation of the appliance is 0.5
bar. Should the pressure fall below 0.5 bar, the
boiler may lockout.

Depending on the type of controls specified by
your installer you may have an integral Vokera
time clock fitted to the appliance, if so, instructions
can be found on page 8-9. If an external time

Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

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4

clock or programmer has been fitted, please refer
to the instructions supplied with such.

2.3 LIGHTING THE BOILER

Ensure the gas and electrical supply to the boiler
are turned on.

The boiler will now go through a self-test and
purge sequence indicated by the letter ‘A’ shown
on the left side of the digital display.

2.3.1 ON/OFF MODES (heating)

The heating mode can be switched ON or OFF at
the boiler irrespective of the current time clock
setting. This is indicated by the heating LED (fig. 1).

If the heating LED is illuminated, this indicates
that the heating mode is enabled and is controlled
via the time clock and any external controls such
as a room thermostat.

If the heating LED is unlit, the boiler will not
respond to any heat requests from the time clock
or room thermostat etc.

To switch the heating mode ON or OFF, press
and hold the button (fig. 2) whilst looking at
the digital display:

●

c OF

indicates the heating mode is switched

OFF

●

c 55

(or any other number, indicating the central
heating operating temperature), indicates the
heating mode is switched ON.

2.3.2 ON/OFF MODES (hot water)

The hot water mode can be switched ON or OFF
at the boiler. This is indicated by the hot water
LED (see fig. 1).
If the hot water LED is illuminated, this indicates
that the hot water mode is enabled.
If the hot water LED is unlit, the boiler will not
respond to any hot water requests whenever a
hot water outlet (tap) is opened.
To switch the hot water mode ON or OFF , press

and hold the button (fig. 3) whilst looking at
the digital display:

●

d OF

indicates the hot water mode is switched

OFF

●

d 40

(or any other number, indicating the
domestic hot water operating temperature),
indicates the hot water mode is switched ON.

The boiler will pre-heat the DHW heat exchanger
if it is below 55ºC, however should a hot water outlet
be opened the boiler will operate in the domestic
hot water mode to supply hot water to the tap.
On completion of the pre-heat function, the boiler
will revert to the stand-by mode indicated by ‘0’
shown in the left side of the digital display.

2.3.3 HEATING REQUEST

When there is a demand for heating via the time
clock, the boiler will go through an ignition
sequence, whereby the burner will light.

When the appliance reaches the set temperature,
the burner will go off for minimum period of
approximately 90 seconds.
When the programmer/time clock or external
thermostats heating request has been satisfied,
the appliance will switch off automatically.

2.3.4 HOT WA TER REQUEST

When a hot water outlet or tap is opened, the
boiler senses a change of inlet temperature and
initiates an ignition sequence. The boiler will
modulate the output according to the temperatu-

Fig. 2

re required, when the hot water request has been
satisfied, the boiler may continue to operate if
the pre-heat function is required.

NOTE

If the appliance fails to ignite during the ignition
sequence, it will re-attempt ignition several times
before going to a lockout condition. Should this
occur, please allow a period of two minutes before
re-setting.

2.3.5 STATUS LED (fig. 1)

The appliance status LED indicates whether the
boiler is in OFF mode, ON mode or fault condition.

Status LED flashing Green

Indicates the appliance is in the OFF mode, with
electrical supply and frost protection active.

Status LED permanently Green*

Indicates the appliance is ON mode, with heating
or hot water or both activated.

Status LED permanently Red

This indicates that the appliance is in a permanent
fault condition and may require to be reset
(indicated by the relevant fault code displayed)
see 2.6.

*Also illuminated during a temporary fault
condition.

2.4 ADJUSTING THE OPERATING PARAMETERS

Usually your installer will have adjusted the
operating temperatures to suit your requirements,
however should you wish to view or alter them,
please use the following procedure:

Central heating temperature

● to view or alter the heating operating

temperature, briefly press the button;

● the central heating LED will now flash and the

operating temperature will be shown on the
right side of the display (see fig. 2);

● use the

+

or - button to adjust the operating

temperature if required;

● press the button to save the new setting.

Hot water temperature

● to view or alter the hot water operating tempe-

rature, briefly press the button;

● the hot water LED will now flash and the

operating temperature will be shown on the right
side of the display (see fig. 3);

● use the

+

or - button to adjust the operating

temperature if required;

● press the button to save the new setting.

Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

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Current status

Stand-by mode

Purging

Ignition

Heating mode

Hot water mode

Fan operation

Timer delay

Pump over run (CH)

Pump over run (HW)

Self check

Left display shows

0
1
2
3
4
5
6
7
8
A

Reason

Ignition anomaly

No flame detected

Internal fault

Power failure

Internal fault
Internal fault
Internal fault
Internal fault

Appliance overheat

Internal fault
Internal fault
Internal fault
Internal fault
Internal fault

Appliance overheat
Appliance overheat
Appliance overheat

Appliance overheat
Temperature anomaly
Temperature anomaly
Temperature anomaly

Condensate pipe blocked

Insufficient fan speed

Fan problem

Fan speed problem

Fan problem
Temperature anomaly
Temperature anomaly

Internal fault

Internal fault

Internal fault

Internal fault

Internal fault

Internal fault

Internal fault

Programming fault

Insufficient fan speed

Code

E 00
E 02
E 03
E 04
E 05
E 06
E 07
E 11
E 12
E 13
E 14
E 15
E 16
E 17
B 18
E 18
B 19
E 19
B 24
B 25
E 25
B 26
B 28
E 28
B 29
E 29
B 30
E 30
E 31
E 32
E 33
E 36
E 37
E 38
E 44
E 60
B 65

2.6 FAULT CODE TABLE

Action required

Reset appliance, if fault continues, call engineer

Check gas is on, reset appliance, if fault continues, call engineer

Call engineer

Reset appliance, if fault continues, call engineer

Call engineer
Call engineer
Call engineer
Call engineer

Reset appliance, if fault continues, call engineer

Call engineer
Call engineer
Call engineer
Call engineer
Call engineer

Ensure radiators are on

Reset appliance, if fault continues, call engineer

Ensure radiators are on

Reset appliance, if fault continues, call engineer

If fault continues, call engineer

Check pressure gauge

Check pressure gauge, reset appliance, if fault continues, call engineer

Check outlet of condense pipe, if problem persists, call engineer

If fault continues, call engineer

Reset appliance, if fault continues, call engineer

If fault continues, call engineer

Reset appliance, if fault continues, call engineer

Check pressure gauge

Check pressure gauge, reset appliance, if fault continues, call engineer

Call engineer
Call engineer
Call engineer
Call engineer
Call engineer
Call engineer
Call engineer
Call engineer

If fault continues, call engineer

2.5 DIGITAL DISPLAY

The digital display shows the current mode of
operation and/or status of the boiler.

Should a fault develop, the display will show a
unique fault code that can be used to help rectify
the cause of the fault.
During the normal operation, the left side of the
display indicates the current mode of operation,
whilst the right side will show the current
temperature.

Fig. 3

Should a fault occur, the left side of the display
will show whether the fault is temporary or
permanent (indicated by ‘b’ or ‘E’), whilst the right
side of the display indicates the unique fault
code.

Should a fault code be displayed, check the
fault code table to identify the cause and
course of action to take.

Always wait 2-minutes before pressing the
reset button.

Displays during normal operation

Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

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HOW TO...

3.1 HOW TO TOP-UP THE SYSTEM PRESSURE (fig. 4)

The system pressure must be checked periodically
to ensure the correct operation of the boiler. The
needle on the gauge should be reading between
1 and 1.5 bar when the boiler is in an off position
and has cooled to room temperature. If the
pressure requires ‘topping-up’ use the following
instructions as a guide.

● Locate the filling/inlet valve found at base of the

boiler (see fig. 4 & fig. 5).

● The fillig loop (fig. 4) may have been

disconnected from the filling/inlet valve and
heating flow valve. If so reconnect unscrewing
the caps as necessary.

● The filling valve has 3 positions (see fig.5):

i) Vertically up - normal operating position.
ii) Turn to the left to horizontal - closed position.
iii) Vertically down - filling position.
To fill, slowly turn the handle of the filling/inlet
valve towards the filling position. Mains water
will be heard to enter the system/boiler. As the
water enters the system/boiler the pressure
gauge will be seen to rise. Pressurise to be­tween 1bar & 1.5 bar when the system is cold.
DO NOT OVERPRESSURISE.
Once the desired pressure is achieved turn the
filling/inlet valve into the normal position.

3.2 HOW TO RESET THE APPLIANCE

When the status light is illuminated red, the
appliance will require to be reset manually. Before
resetting the boiler ensure that the pressure
gauge is indicating the correct level. Allow a
period of two minutes to elapse before pressing
the reset button.

IMPORTANT

If the appliance requires to be reset frequently, it
may be indicative of a fault, please contact your
installer or Vokera Customer Services for further
advice.

3.3 HOW TO SHUT DOWN THE SYSTEM FOR
SHORT PERIODS

Turn the time clock to the off position. Switch the
boiler to OFF mode (see section 2.3.1 & 2.3.2). It
is also advisable to turn off the main water supply
to the house.

3.4 HOW TO SHUT DOWN THE SYSTEM FOR
LONG PERIODS

If the house is to be left unoccupied for any length
of time – especially during the winter – the system
should be thoroughly drained of all water.
The gas, water and electricity supply to the house
should also be turned off. For more detailed
advice contact your installer.

3.5 HOW TO CARE FOR THE APPLIANCE

To clean the outer casing use only a clean damp
cloth. Do not use any scourers or abrasive
cleaners.

normal
operating
position

filling
position

closed
position

Fig. 5

Fig. 4

Heating valves

Filling loop

Filling/

inlet valve

Gas cock

3.6 HOW TO REGULA TE THE HOT WATER TEM­PERATURE

Usually your installer will have adjusted the hot
water output to suit your requirements, however
if you would like to adjust the outlet temperature,
please follow the instructions in section 2.4.

NOTE

If you find that the hot water temperature is still
insufficient, try reducing the flow of water through
the tap.

Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

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CORGI registered engineer may be able to service
the appliance for you.

4.5 WHAT IF I NEED TO CALL AN ENGINEER

If you think your boiler may have developed a
fault please contact your installer or Vokera
Customer Services (0870 333 0220 (UK) or
05655057 (ROI) have all your details to hand
including full address and postcode, relevant
contact numbers, and your completed appliance
log book.

WHAT IF...

4.1 WHAT IF I SUSPECT A GAS LEAK

If you suspect a gas leak, turn off the gas supply
at the gas meter, and contact your installer or
local gas supplier. If you require further advice
please contact your nearest Vokera office.

4.2 WHAT IF I HAVE FREQUENTLY TO TOP-UP
THE SYSTEM

If the system regularly requires topping-up, it may
be indicative of a leak. Please contact your installer
and ask him to inspect the system.

4.3 WHAT IF THE STATUS LED IS RED

If the status led is illuminated red it indicates that
the boiler has failed to ignite or has overheated,
when this happens the boiler automatically shuts
down and requires to be reset manually (see 3.2).

4.4 WHAT IF THE APPLIANCE IS DUE ITS
ANNUAL SERVICE

Advice for tenants only

Your landlord should arrange for servicing.

Advice for homeowners
Please contact Vokera Customer Services (0870
333 0220 (UK) or 05655057 (ROI) if you would

prefer a Vokera service engineer or agent to
service your appliance. Alternatively your local

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5.2.1 BEFORE PROGRAMMING

Gently press and release the ‘Res.’ button with a
pencil or similar, this will clear the memory of all
information. This should only be done when you
want to change or insert a complete new
programme.

5.2.2 SETTING THE TIME OF DAY

The ‘real time’ clock has to be set to the actual
day of the week and time of day, to do this:

● Press and hold the button (see fig 7).

● Press the ‘Day’ button until the actual day

shows in the display (1= Monday , 2= T uesday,
3= Wednesday, etc.).

● If setting the clock during ‘British summertime’

press the ‘+/-1h’ button once (use a pencil or
similar).

● Press the ‘h’ button until the actual hour is

shown in the display.

● Press the ‘m’ button until the actual minutes

are showing in the display.

● Now release the button.

● The ‘:’ symbol between the hours and minutes

display will start to flash, this indicates that the
clock is now keeping time (see fig. 8).

5.2.3 ENTERING (on) COMMANDS

● Repeatedly press the Prog. Button until the —

:— symbol appears in the clock display (see
fig. 9).

● Press the Day button until the desired group of

days or desired day is shown.

● Press the ‘h’ button until the desired hour for

switching the boiler on is shown.

5.1 VOKERA MECHANICAL CLOCK
Setting the time

The time of day can be set by grasping the outer
edge of the black dial and turning it in a clockwise
direction until the correct time is in line with the
white pointer.

Setting the ‘switching times’

The ‘ON’ periods are set by sliding the black
tappets, adjacent to the time periods required, to
the outer edge of the dial.
The tappets that remain at the centre of the dial
will be the ‘OFF’ periods.

The smallest switching time (ON or OFF) is 15
minutes.

To select ‘Timed’ mode move the selector switch
in the middle of the clock face to the ‘ ‘ position.

To select ‘Constant’ mode move the selector switch
in the middle of the clock face to the ‘I’ position.

To select ‘Off’ mode move the selector switch in
the middle of the clock face to the ‘O’ position.

5.2 VOKERA DIGITAL CLOCK

The Vokera digital time clock will automatically
switch your boiler on and off. It has a total of
twenty different switching commands, consisting
of ten ‘on’ commands and ten ‘off’ commands.

Each ‘on’ or ‘off’ command can be used to switch
the boiler ‘on’ or ‘off’ at the same time:

● Every day of the week

● Monday to Saturday

● Monday to Friday

● Saturday and Sunday

● Any particular day

Group of days On Off Commands

used
Mon. to Fri. 06.00 09.00 2
Mon. to Fri. 16.00 21.00 2
Sat. & Sun. 08.30 10.30 2
Sat. & Sun. 17.00 23.00 2

Total 8 used

Commands ‘free’ 12 unused

Example

Fig. 6

Select button

Reset button

“British summertime”
button

Hour button

Minute button

Display

Day button

Programme
button

Clock button

VOKERA DIGITAL TIME CLOCK

VOKERA TIMECLOCKS

Fig. 5

ON period

OFF period

Selector

switch

Fig. 7 Fig. 8

Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

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9

● Press the ‘m’ button until the desired minutes

are shown.

● Press the Select button until the symbol is

shown (see fig. 10).

● Press the button.

5.2.4 ENTERING (off) COMMANDS

● Repeatedly press the Prog. Button until the —

:— symbol appears in the clock display (fig. 5).

● Press the Day button until the desired group of

days or desired day is shown.

● Press the ‘h’ button until the desired hour for

switching the boiler off is shown.

● Press the ‘m’ button until the desired minutes

are shown.

● Press the Select button until the symbol is

shown (see fig. 11).

● Press the button.

Once the programming has been completed you
will have to press the Select button – once only
– to the (on) position if the boiler has been
programmed to be ‘on’ at that particular time.

5.2.5 ADVANCING OR LOCKING PROGRAMME
COMMANDS

By pressing the Select button you can advance the
time clock to the next command setting (from ‘on’ to
‘off’ or ‘off’ to ‘on’) or lock the time clock to a particular
command (‘on’ continuously or ‘off’ continuously).

● - ON

● - OFF

● [ ] – ON CONTINUOUSLY

● [ ] – OFF CONTINUOUSLY

NOTE

The actual time can be changed to account for
British summertime by simply pressing then re­leasing the +/- 1h button.

HELPFUL HINTS

● You can check and/or alter the programme

settings at any time by pressing the Prog button.

● The number of unused ‘commands’ can be checked

by pressing the Prog button until FR is displayed
alongside the number of unused commands.

● In the event of a power failure, the clock has a

battery back-up. The programme will be held
in the memory for approximately 2 weeks.
Charging time is 70 hours.

● Take a note of the settings you have pro-

grammed, as local power surges can some­times reset the memory of the clock.

Fig. 9 Fig. 10

Fig. 11

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NOTE

Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

01274 488 388

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Unit 3A, Thornton Road Ind. Estate Off Hockney Road Bradford, BD8 9HQ

01274 488 388

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Vokèra Ltd.

4th Floor, Catherine House, Boundary Way, Hemel Hempstead, Herts, HP2 7RP

Email: [e-mail] Web: www.vokera.co.uk

Sales, Technical Advice, General Enquiries - Tel: [phone] Fax: [phone]

After Sales Service - Tel: [phone]

Vokèra Ireland

West Court, Callan, Co Kilkenny

Tel: [phone] Fax: [phone]

Vokèra Ltd. reserve the right to change the specifications without prior notice. Consumers’ statutory rights are not affected.

A Riello Group Company

energizing home heating

“Vokèra”

supports Benchmark

COLLECTIVE MARK

Cod. 10023776 - 49/03 - Ed. 2

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