Mynute i
High efficiency system boiler
Users Instructions
Installation &
Servicing
Instructions
Mynute i20 G.C. N. 41 094 81
Mynute i30 G.C. N. 41 094 82
THESE INSTRUCTIONS
TO BE RETAINED
BY USER
Vokèra is a licensed member of the Benchmark scheme
which aims to improve the standards of installation and
commissioning of domestic hot water systems in the UK.
40
Users instructions
Things you should know
1.1
Gas appliances
1.2
Electrical supply
1.3
Guarantee registration card
1.4
Appliance Log Book (UK only)
1.5
1.6
1.7
1.8
1.9
How does it work?
Dimensions
Clearances required
Frost protection system
Appliance status indicators
Getting started
2.1
Before switching ON
2.2
2.3
2.4
2.5
2.6
Appliance controls
Lighting the boiler
Adjusting the heating temperature
Explanation of features
Automatic temperature control
How to...
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1
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3
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3
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Page
3.1
How to top-up the system pressure
4
3.2
3.3
3.4
3.5
How to reset the appliance
How to shut down the system for short periods
How to shut down the system for long periods
How to care for the appliance
4
4
4
4
What if...
4.1
4.2
4.3
4.4
What if I suspect a gas leak
What if I have frequently top-up the system
What if the appliance is due its annual service
What if I need to call an engineer
Page
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4
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4
Installation and Servicing instructions
Design principles & operating sequence
1.1
1.2
1.3
1.4
Principle components
Mode of operation (at rest)
Mode of operation (heating)
Safety devices
Page
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7
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Technical data
2.1 Central heating
2.2 Gas pressures
2.3 Expansion vessel
2.4 Dimensions
2.5 Clearances
2.6 Connections
2.7 Electrical
2.8 Flue details (concentric)
2.8A Flue details (twin pipes)
2.9 Efficiency
2.10 Emissions
2.11 Pump duty
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General requirements (UK)
3.1 Related documents
3.2 Location of appliance
3.3 Gas supply
3.4 Flue system
3.5 Air supply
3.6 Water circulation
3.7 Electrical supply
3.8 Mounting on a combustible surface
3.9 Timber framed buildings
3.10 Inhibitors
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General requirements (EIRE)
3A.1 Related documents
3A.2 Location of appliance
3A.3 Gas supply
3A.4 Flue system
3A.5 Air supply
3A.6 Water circulation
3A.7 Electrical supply
3A.8 Mounting on a combustible surface
3A.9 Timber framed buildings
3A.10 Inhibitors
3A.11 Declaration of conformity
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Installation
4.1 Delivery
4.2 Contents
4.3 Unpacking
4.4 Preparation for mounting the appliance
4.5 Fitting the flue
4.6 Connecting the gas & water
4.7 Electrical connections
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13
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Commissioning
Page
5.1 Gas supply installation
18
5.2 The heating system
18
5.3 Initial filling of the system
18
5.4 Initial flushing of the system
18
5.5 Pre-operation checks
18
5.6 Initial lighting
18
5.7 Checking gas pressure & combustion analysis
18
5.8 Final flushing of the heating system
18
5.9 Setting the boiler operating temperature
18
5.10 Setting the system design pressure
18
5.11 Regulating the central heating system
19
5.12 Final checks
19
5.13 Instructing the user
19
Servicing
6.1 General
6.2 Routine annual servicing
6.3 Replacement of components
6.4 Component removal procedure
6.5 Pump assembly
6.6 Safety valve
6.7 Lower automatic air release valves
6.8 Water pressure switch
6.9 Flow thermistor
6.10 Return thermistor
6.11 Printed circuit board
6.12 Gas valve
6.13 Electrodes
6.14 Flue fan & mixer
6.15 Burner
6.16 Main heat exchanger
6.17 Automatic by-pass
6.18 Expansion vessel removal
6.19 Condense trap removal
6.20 Flue collector removal
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Checks, adjustments and fault finding
7.1 Checking appliance operation
7.2 Appliance modes of operation
7.3 Checking the CO2 & adjusting the valve
7.4 Combustion analysis test
7.5 Checking the expansion vessel
7.6 External faults
7.7 Electrical checks
7.8 Fault finding
7.9 Component values & characteristics
7.10 Adjustments
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Wiring diagrams
8.1 External wiring
8.2 Typical control applications
8.3 Other devices
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L.P.G. instructions
Page
9.1 Related documents
31
9.2 Technical data
31
9.3 Converting the appliance gas type
31
9.4 Gas supply
31
9.5 Gas supply installation
31
9.6 Checking the CO2 and adjusting the gas valve
31
Benchmark
Commissioning
34-35
36
37
USERS INSTRUCTIONS
INTRODUCTION
Dear Customer
Your Vokèra Mynute i 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 the boiler should not be used by children or unassisted disabled people
- 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 section
- 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.
This booklet is an integral part of the appliance. It is therefore necessary to ensure that the booklet is handed to the person responsible for the property in which the appliance is located/installed. A replacement copy can be obtained from Vokèra customer
services.
1. THINGS YOU SHOULD KNOW
1.1 GAS APPLIANCES
Gas Safety (Installations and Use) Regulations (UK).
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!
1.7 CLEARANCES REQUIRED
ABOVE
150 mm
BELOW
150 mm
LEFT SIDE
12 mm
RIGHT SIDE
12 mm
FRONT
600 mm
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 APPLIANCE COMMISSIONING CHECKLIST
(UK only)
A checklist section can be found at the rear of the appliance
installation booklet. This important document must be completed during the installation/commissioning of your boiler. All
GAS SAFE registered installers carry a GAS SAFE ID card,
and have a registration number. These details should be recorded in the Benchmark commissioning checklist section
within the installation booklet. You can check your installers
details by calling GAS SAFE direct on 08004085500. Failure
to install and commission the appliance in accordance with
the manufacturers instructions will invalidate the warranty.
This does not affect your statutory rights.
1.5 HOW DOES IT WORK?
Your Mynute i boiler supplies heated water to your radiators
and hot water to your hot water tank. The central heating is
controlled via a time clock and any thermostats that your installer
may have fitted. The boiler will light when it receives a request
from the time clock via any thermostat that may be installed.
Your Mynute i 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.
1.8 FROST PROTECTION SYSTEM
The Mynute i is equipped with a built-in frost protection system,
this enables the boiler to over-ride the time controls – even if
switched off – and operate the burner and/or pump, should
the temperature drop below 50C for the main. In particular the
burner will be in ON status until the main temperature reaches
35°C for CH appliance.
Please note that the frost protection system is designed to
protect the appliance only, should frost protection be required
for the 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 APPLIANCE STATUS INDICATORS
Your boiler is equipped with a large LCD display that indicates
the appliance operating status.
1.6 DIMENSIONS
Mynute i20
Mynute i30
HEIGHT
780 mm
780 mm
WIDTH
400 mm
400 mm
DEPTH
338 mm
388 mm
1
Fig. 1
MODE SELECTOR SWITCH
HEATING TEMPERATURE SELECTOR
PRESSURE GAUGE
DISPLAY
PRESSURE GAUGE
Ensure the system pressure is set correctly (minimum 0.5-bar)
MODE SELECTOR SWITCH/HEATING TEMPERATURE SELECTOR
Mode selector switch:
Heating & hot water - Select this position when you want the boiler to respond to a heating and hot water request from the time-clock programmer
SARA
function
Heating temperature selector: move the selector clockwise to increase
the heating outlet temperature, or counter-clockwise to reduce the temperature (range: 40°C-80°C for standard central heating).
The automatic temperature control function (SARA) is set within the blank
bullet points.
Boiler at OFF/standby - Select this position when you want the boiler to
be switched off for short periods (days).
Boiler reset - Select this position if the boiler requires to be reset.
Pressure gauge shows the current pressure of your heating 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.
2
correct
pressure
value
DIGITAL DISPLAY
Symbol/Icon
Description
Displayed when heating mode is active
Displayed when frost protection function is active
65
Displayed if an alarm or fault has been detected
Displayed when low system pressure has been
detected
Displayed when an external sensor is connected
to the boiler
Flame on
Displayed if an ignition fault has been detected
2. 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 or programmer (if fitted);
- any external thermostats and their functions;
- the appliance controls.
2.2 APPLIANCE CONTROLS (see fig. 1)
The appliance controls are situated on the lower front of the
appliance. The appliance controls include:
- pressure gauge;
- appliance mode selector;
- temperature selector
NOTE
The appliance frost protection is active in all the boiler modes.
The temperature selector can be used to vary the temperature
of the water that circulates around your radiators.
The temperature range is adjustable between 40°C and 80°C.
Refer to the main appliance status table for fault indicator and
boiler status.
appliance reaches the CH set temperature, the burner will go
off for a minimum period of approximately 3 minutes.
When the programmer/time clock or external thermostats
heating request has been satisfied, the appliance will switch
off automatically.
2.4 ADJUSTING THE HEATING TEMPERATURE
Rotate the temperature selector – clockwise to increase, counterclockwise to decrease – to the desired temperature setting. The
temperature can be set from a minimum of 40°C to a maximum
of 80°C (if standard CH mode is selected).
2.5 EXPLANATION OF FEATURES
Although the Vokèra Mynute i has been designed for simplicity
of use, it utilises the latest in boiler technology, enabling a host
of functions to be carried out simultaneously.
2.6 AUTOMATIC TEMPERATURE CONTROL
The automatic temperature control function (SARA), permits the
boiler (when the heating temperature selector is set within the
blank bullet points) to automatically adjust (raise) the heating.
The activation and the disable of the function is visualized on
the display.
2.3 LIGHTING THE BOILER
Ensure the gas and electrical supply to the boiler are
turned on.
Turn the mode selector switch to the ON position. When there
is a request for heating or hot water via the time clock or programmer, the boiler will begin an ignition sequence. When the
3
3. HOW TO...
4. WHAT IF...
3.1 HOW TO TOP-UP THE SYSTEM PRESSURE
(fig. 1-2)
4.1 WHAT IF I SUSPECT A GAS LEAK
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 valve connections (usually beneath the
boiler, see fig. 2).
- Attach the filling loop to both connections.
- Open the filling valve slowly until you hear water entering the
system.
- Close the filling valve when the pressure gauge (on the boiler)
reads between 1 and 1.5 BAR (see fig. 1).
- Remove the filling loop from the connections.
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 Vokèra office.
3.2 HOW TO RESET THE APPLIANCE
Advice for tenants only
Your landlord should arrange for servicing.
Advice for homeowners
Please contact Vokèra Customer Service (0844 3910999 (UK)
or 056 7755057 (ROI) if you would prefer a Vokèra service
engineer or agent to service your appliance. Alternatively your
local GAS SAFE registered engineer may be able to service
the appliance for you.
When the red fault LED is illuminated, the appliance will require
to be reset manually. Before resetting the boiler, check what
action is required to be taken, using the information on the
fault code table below. Allow a period of two minutes to elapse
before rotate the mode selector knob across the
position
(see fig. 1).
IMPORTANT
If the appliance requires to be reset frequently, it may be indicative of a fault, please contact your installer or Vokèra Customer
Services for further advice.
3.3 HOW TO SHUT DOWN THE SYSTEM FOR SHORT
PERIODS
The system and boiler can be shut down for short periods by
simply turning the time clock to the off position. 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.
Fig. 2
control
valve
temporary
connection
flow/return
pipe
4
double
check valve
control
valve
supply pipe
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 APPLIANCE IS DUE ITS ANNUAL SERVICE
4.4 - WHAT IF I NEED TO CALL AN ENGINEER
If you think your boiler may have developed a fault, please contact
your installer or Vokèra Customer Services (0844 3910999 (UK)
or 056 7755057 (ROI) have all your details to hand including
full address and postcode, relevant contact numbers, and your
completed appliance log book.
FAULT CODES
ALARM CODE CAUSE
_St
_CL
A01
A02
A03
A04
A06
A07
A08
A09
A11
A77
Adj
ACO
Hours
--
ALARM TYPE
ACTION
AUTOSTOP
Final
Call engineer
CALL FOR SERVICE
Temporary then final
Call engineer
Ignition failure, flame not sensed,
internal fault
Final
Reset, check appliance operation
Limit thermostat fault
Final
Reset, check appliance operation
Fan tacho signal fault
Final
Reset check appliance operation, check fan
Insufficient system water pressure
Final
Check/refill system pressure, reset, check
appliance operation
Jumper tag configuration
Temporary
Check jumper tag configuration
Primary (flow) thermistor fault
Temporary
Check primary thermistor, check wiring
Primary (flow) thermistor over temperature Temporary then final
Reset, check appliance operation
Temperature differential
Final
Reset, check appliance operation, check
thermistors
Return thermistor fault
Temporary
Check return thermistor, check wiring
Return thermistor over temperature
Temporary then final
Reset, check appliance operation
Temperature differential inverted
Final
Reset, check pump, ensure there is sufficient circulation around heating circuit/s
Flue thermistor or flue thermistor
Temporary
counter fault
Check flue thermistor counter at power
on, check flue thermistor, check wiring
Flue thermistor over temperature
Final
Reset, check appliance operation
False flame
Temporary
None
Low temperature thermostat fault
Temporary
Check low temperature thermostat
Calibration
Na
None
Service operation
Na
None
Purge cycle mode active
Na
None
Flame ON
Na
None
Stand-by
Na
None
OFF
Na
None
5
INSTALLATION AND SERVICING INSTRUCTIONS
INTRODUCTION
All installers are asked to follow the Benchmark Scheme by
adhering to the Code of Practise, which can be obtained from
www.centralheating.co.uk.
The Mynute i are high-efficiency system boilers with outputs of
20kW and 30kW. These appliances – by design – incorporate
electronic ignition, circulating pump, expansion vessel, safety
valve, pressure gauge and automatic by-pass.
The Mynute i range is produced as room sealed, category
II2H3P appliances, suitable for internal wall mounting applications only. Each appliance is provided with a fan powered flue
outlet with an annular co-axial combustion air intake that can
be rotated – horizontally – through 360 degrees for various
horizontal or vertical applications. The Mynute i can also be
used with the Vokèra twin flue system.
The Mynute i is approved for use with C13 & C33 type flue
applications.
These appliances are designed for use with a sealed system
only; consequently they are not intended for use on open
vented systems.
This booklet is an integral part of the appliance. It is therefore
necessary to ensure that the booklet is handed to the person
responsible for the property in which the appliance is located/
installed. A replacement copy can be obtained from Vokèra
customer services.
General layout
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
R
F
G
Fig. 3
6
R
F
G
Safety valve
Drain valve
Pressure switch
Pump
Bottom auto air vent (AAV)
Expansion vessel
Condense trap
Return thermistor (NTC)
Sensing Electrode
High limit thermostat
Flow thermistor (NTC)
Top AAV+De-aerator
Flue gas analysis test point
Flue outlet & air intake
Ignition transformer
Flues thermistor (NTC)
Spark Electrode
Burner
Main heat exchanger
Conveyor
Fan assembly
Mixer
Condense trap
Gas valve
Three way porte valve
Heating return connection
Heating flow connection
Gas connection
SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE
1.1 PRINCIPLE COMPONENTS
 A fully integrated electronic control board featuring electronic
temperature control, anti-cycle control, pump over-run, selfdiagnostic fault indicator, full air/gas modulation
 Aluminium heat exchanger
 Electronic ignition with flame supervision
 Integral high-head pump
 Fan
 Expansion vessel
 Water pressure switch
 Flue sensor
 Pressure gauge
 Safety valve
1.2 MODE OF OPERATION (at rest)
When the appliance is at rest and there are no requests for
heating or hot water, the following functions are active:
 frost-protection system – the frost-protection system protects
the appliance against the risk of frost damage. For CH line, if
the main temperature falls to 5°C, the appliance will function
on minimum power until the temperature on main reaches
35°C.
 anti-block function – the anti-block function enables the pump
to be energised for short periods, when the appliance has
been inactive for more than 24-hours.
Flow temperature
sensor
1.3 MODE OF OPERATION (Heating)
When there is a request for heat via the time clock and/or any
external control, 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 circuit to ensure flame stability
at the burner. Once successful ignition has been achieved, the
electronic circuitry 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 temperature 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 operate to dissipate any residual
heat within the appliance.
1.4 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 pressure drop below the rated tolerance;
 fan speed sensor to ensure safe operation of the burner;
 a high limit thermostat that over-rides the temperature control
circuit to prevent or interrupt the operation of the burner;
 flame sensor that will shut down the burner when no flame
signal is detected;
 flue sensor;
 a safety valve which releases excess pressure from the
primary circuit.
Top AAV
Main heat
exchanger
Return
temperature
sensor
Bottom
AAV
Pressure
switch
Pump
Safety
valve
Drain
valve
Automatic
by-pass
Fig. 4
CH
return
CH
flow
7
SECTION 2 - TECHNICAL DATA
2.1 Central Heating
Mynute i20
Mynute i30
Heat input (kW)
20.00
30.00
Maximum heat output (kW) 60/80°C
19.62
29.25
Minimum heat output (kW) 60/80°C
G20
G31
G20
G31
2.76
3.95
3.50
4.87
Maximum heat output (kW) 30/50°C
Minimum heat output (kW) 30/50°C
21.44
3.00
31.77
4.20
0.25-0.45 bar
Maximum working pressure
2.5 bar
Minimum flow rate
2.3 Gas Pressures
5.29
300 l/h
Mynute i20
Inlet pressure (G20)
Mynute i30
20.0 mbar
Heating maximum gas rate (m3/hr)
2.12
3.17
Minimum gas rate (m3/hr)
0.30
0.38
4.70 flap side - 4.20 free side
5.10 flap side - 4.70 free side
Injector size (mm)
2.4 Expansion Vessel
Mynute i20
Mynute i30
Capacity
8 litres
Maximum system volume
76 litres
Pre-charge pressure
2.5 Dimensions
1 bar
Mynute i20
Height (mm)
Depth (mm)
Mynute i30
780
Width (mm)
400
338
388
Dry weight (kg)
40
38
2.6 Clearances
Mynute i20
Mynute i30
Sides
Top
12mm
150mm from casing or 25mm above flue elbow (whichever is applicable)
Bottom
150mm
Front
2.7 Connections
600mm
Mynute i20
Mynute i30
Flow & return
22mm
Gas
15mm
Safety valve
15mm
Condense
21mm
2.8 Electrical
Power consumption (Watts)
Mynute i20
118
230/50
Internal fuse
3.15A T (for PCB) - 3.15A F (for connections block)
External fuse
2.9 Flue Details (concentric 60-100)
Maximum horizontal flue length (60/100mm)
Maximum vertical flue length (60/100mm)
2.9A Flue Details (concentric 80-125)
Maximum horizontal flue length (80/125mm)
Maximum vertical flue length (80/125mm)
Mynute i30
102
Voltage (V/Hz)
3A
Mynute i20
Mynute i30
7.80m
7.85m
8.80m
8.85m
Mynute i20
Mynute i30
20m
14.85m
21m
15.85m
Mynute i20
Mynute i30
Maximum horizontal flue length (80mm/80mm)
50m/50m
38m/38m
Maximum vertical flue length (80mm/80mm)
50m/50m
38m/38m
Mynute i20
Mynute i30
2.9B Flue Details (twin pipes)
2.10 Efficiency
UK (%) 2005
2.11 Emissions
90.30
90.03
Mynute i20
Mynute i30
CO2 @ maximum output (%)
9.0
CO2 @ minimum output (%)
9.0
CO @ maximum output (ppm)
150
CO @ minimum output (ppm)
Nox rating
8
3.80
Minimum working pressure
10
5
class 5
2.11 PUMP DUTY
Fig. 6 shows the flow-rate available – after allowing for pressure loss through the appliance – for system requirements. When
using this graph, apply only the pressure loss of the system.
Mynute i30
Mynute i20
6,0
4,0
3rd
sp
Residual head (x 100 mbar)
Residual head (x 100 mbar)
5,0
ee
3,0
d
2n
ds
pe
ed
2,0
1s
ts
pe
ed
1,0
0,0
0
100
200
300
400
500
600
700
800
900
1000
Flow rate (l/h)
5,4
5,2
5,0
4,8
4,6
4,4
4,2
4,0
3,8
3,6
3,4
3,2
3,0
2,8
2,6
2,4
2,2
2,0
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
0,0
3rd
sp
ee
2n
d
d
sp
ee
d
1s
ts
pe
ed
0
100
200
300
400
500
600
700
800
900
1000 1100 1200 1300 1400 1500 1600
Flow rate (l/h)
Fig. 5
Fig. 6
Key
A
B
C
D
E
F
G
H
I
J
K
L
M
N
P
Q
R
S
T
V
W
Location
Minimum distance
Below an opening (window, air-brick, etc.)
Above an opening (window, air-brick, etc.)
To the side of an opening (window, air-brick, etc.)
Below gutter, drain-pipe, etc.
Below eaves
Below balcony, car-port roof, etc.
To the side of a soil/drain-pipe, etc.
From internal/external corner
Above ground, roof, or balcony level
From a surface or boundary facing the terminal
From a terminal facing a terminal
From an opening in the car-port into the building
Vertically from a terminal on the same wall
Horizontally from a terminal on the same wall
From a structure to the side of the vertical terminal
From the top of the vertical terminal to the roof flashing
300 mm
300 mm
300 mm
25 mm
25 mm
25 mm
25 mm (60mm for 80/125 - 5” flue)
25 mm (60mm for 80/125 - 5” flue)
300 mm
600 mm
1200 mm
1200 mm
1500 mm
300 mm
300 mm
As determined by the fixed collar
of the vertical terminal
To the side of a boundary
300 mm
To the side of an opening or window on a pitched roof
600 mm
Below an opening or window on a pitched roof
2000 mm
From a vertical terminal to an adjacent opening (window, air-brick, etc.)
(call Vokera technical for advice)
300 mm (only if both terminals are the same hight)
From a vertical terminal to an adjacent vertical terminal
9
SECTION 3 - GENERAL REQUIREMENTS (UK)
This appliance must be installed by a competent person in accordance with the Gas Safety (Installation & Use) Regulations.
3.1 RELATED DOCUMENTS
The installation of this boiler must be in accordance with the
relevant requirements of the Gas Safety (Installation & Use)
Regulations, the local building regulations, the current I.E.E.
wiring regulations, the bylaws of the local water undertaking,
the Building Standards (Scotland) Regulation and Building
Standards (Northern Ireland) Regulations.
It should be in accordance also with any relevant requirements
of the local authority and the relevant recommendations of the
following British Standard Codes of Practice.
3.5 AIR SUPPLY
The following notes are intended for general guidance only.
This appliance is a room-sealed, fan-flued boiler, consequently
it does not require a permanent air vent for combustion air supply. When installed in a cupboard or compartment, ventilation
for cooling purposes is also not required.
3.6 WATER CIRCULATION
Detailed recommendations are given in BS 5449 Part 1 and
BS 6798. The following notes are for general guidance only.
3.6.1 PIPEWORK
It is recommended that copper tubing to BS 2871 Part 1 is used
in conjunction with soldered capillary joints. Where possible
pipes should have a gradient to ensure air is carried naturally to
air release points and that water flows naturally to drain cocks.
Except where providing useful heat, pipes should be insulated
to avoid heat loss and in particular to avoid the possibility of
freezing. Particular attention should be paid to pipes passing
through ventilated areas such as under floors, loft space and
void areas.
3.2 LOCATION OF APPLIANCE
The appliance may be installed in any room or internal space,
although particular attention is drawn to the requirements
of the current I.E.E. wiring regulations, and in Scotland, the
electrical provisions of the Building Regulations, with respect
to the installation of the appliance in a room or internal space
containing a bath or shower.
BS 5440
PART 1
FLUES
BS 5440
PART 2
FLUES & VENTILATION
BS 5449
PART 1
FORCED CIRCULATION HOT WATER SYSTEMS
BS 5546
INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
BS 6798
INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW
BS 6891
LOW PRESSURE INSTALLATION PIPES
BS 7074
PART 1
APPLICATION, SELECTION, AND INSTALLTION OF EXPANSION VESSELS
AND ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS
When an appliance is installed in a room or internal space
3.6.2 AUTOMATIC BY-PASS
containing a bath or shower, the appliance or any control perThe appliance has a built-in automatic by-pass, consequently
taining to it must not be within reach of a person using the bath
there is no requirement for an external by-pass, however the
or shower. The location chosen for the appliance must permit
design of the system should be such that it prevents boiler
the provisions of a safe and satisfactory flue and termination.
‘cycling’.
The location must also permit an adequate air supply for combustion purposes and an adequate space for servicing and air
3.6.3 DRAIN COCKS
circulation around the appliance. Where the installation of the
These must be located in accessible positions to facilitate
appliance will be in an unusual location special procedures may
draining of the appliance and all water pipes connected to the
be necessary, BS 6798 gives detailed guidance on this aspect.
appliance. The drain cocks must be manufactured in accordA compartment used to enclose the appliance must be designed
ance with BS 2879.
and constructed specifically for this purpose. An existing com3.6.4 AIR RELEASE POINTS
partment/cupboard may be utilised provided that it is modified
These must be positioned at the highest points in the system
to suit. Details of essential features of compartment/cupboard
where air is likely to be trapped. They should be used to expel
design including airing cupboard installations are given in BS
trapped air and allow complete filling of the system.
6798. This appliance is not suitable for external installation.
3.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier – must be
checked to ensure that it is of adequate size to deal with the
maximum rated input of all the appliances that it serves. Installation pipes must be fitted in accordance with BS 6891.
Pipe work from the meter to the appliance must be of adequate
size. Pipes of a smaller size than the appliance gas inlet connection must not be used. The installation must be tested for
tightness in accordance with BS6891. If the gas supply serves
more than one appliance, it must be ensured that an adequate
supply is maintained to each appliance when they are in use
at the same time.
3.4 FLUE SYSTEM
The terminal should be located where the dispersal of combustion
products is not impeded and with due regard for the damage
and discoloration that may occur to building products located
nearby. The terminal must not be located in a place where it
is likely to cause a nuisance (see fig. 6). In cold and/or humid
weather, water vapour will condense on leaving the terminal;
the effect of such pluming must be considered.
If installed less than 2m above a pavement or platform to
which people have access (including balconies or flat roofs)
the terminal must be protected by a guard of durable material.
The guard must be fitted centrally over the terminal. Refer to
BS 5440 Part 1, when the terminal is 0.5 metres (or less) below
plastic guttering or 1 metre (or less) below painted eaves.
10
3.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel to accommodate the increased volume of water when the system is
heated. It can accept up to 8 litres of expansion from within
the system, generally this is sufficient, however if the system
has an unusually high water content, it may be necessary to
provide additional expansion capacity (see 6.18).
3.6.6 FILLING POINT
A method for initial filling of the system and replacing water lost
during servicing etc. directly from the mains supply, should be
provided (see fig. 8). This method of filling complies with the
current Water Supply (Water Fittings) Regulations 1999 and
Water Bylaws 2000 (Scotland). If an alternative location.
3.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of filling the system would be from an
independent make-up vessel or tank mounted in a position at
least 1 metre above the highest point in the system and at least
5 metres above the boiler (see fig. 8).
The cold feed from the make-up vessel or tank must be fitted
with an approved non-return valve and stopcock for isolation
purposes. The feed pipe should be connected to the return pipe
as close to the boiler as possible.
3.6.8 FREQUENT FILLING
Frequent filling or venting of the system may be indicative
of a leak. Care should be taken during the installation of the
appliance to ensure all aspects of the system are capable of
withstanding pressures up to at least 3 bar.
3.7 ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V @ 50Hz electrical supply; it must be protected with a 3-amp fuse. The method
of connection to the mains electricity supply must allow for
complete isolation from the supply. The preferred method is by
using a double-pole switch fused spur with a contact separation
of at least 3,5mm (3° high-voltage category). The switch must
only supply the appliance and its corresponding controls, i.e.
time clock, room thermostat, etc. Alternatively an un-switched
shuttered socket with a fused 3-pin plug both complying with
BS 1363 is acceptable.
3.9 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed building, it
should be fitted in accordance with the Institute of Gas Engineers
publication (IGE/UP/7) ‘Guide for Gas Installations in Timber
Frame Buildings’.
temporary
connection
flow/return
pipe
double
check valve
Fig. 7
control
valve
supply
pipe
Make-up vessel
or tank
Automatic
air-vent
Non-return
valve
3.10 INHIBITORS
Vokèra recommend that an inhibitor - suitable for use with
aluminium heat exchangers - is used to protect the boiler and
system from the effects of corrosion and/or electrolytic action.
The inhibitor must be administered in strict accordance with
the manufacturers instructions*.
*Water treatment of the complete heating system - including
the boiler - should be carried out in accordance with BS 7593
and the Domestic Water Treatment Association’s (DWTA) code
of practice.
Fig. 8
Stopcock
5.0 metres minimum
3.8 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be fitted on a wall of combustible material, there is no requirement for a sheet of fireproof material to
protect the wall.
control
valve
Heating
return
SECTION 3A - GENERAL REQUIREMENTS (EIRE)
This appliance must be installed by a competent person in
accordance with and defined by, the Standard Specification
(Domestic Gas Installations) Declaration (I.S. 813).
3A.1 RELATED DOCUMENTS
The installation of this boiler must be in accordance with the
relevant requirements of the local building regulations, the
current ETCI National Rules for Electrical Installations and the
bylaws of the local water undertaking.
It should be in accordance also with any relevant requirements
of the local and/or district authority.
3A.2 LOCATION OF APPLIANCE
The appliance may be installed in any room or internal space,
although particular attention is drawn to the requirements of
the current ETCI National Rules for Electrical Installations, and
I.S. 813, Annex K.
When an appliance is installed in a room or internal space
containing a bath or shower, the appliance or any control
pertaining to it must not be within reach of a person using the
bath or shower.
The location chosen for the appliance must permit the pro Mynute
i of a safe and satisfactory flue and termination. The location
must also permit an adequate air supply for combustion purposes
and an adequate space for servicing and air circulation around
the appliance. Where the installation of the appliance will be
in an unusual location special procedures may be necessary,
refer to I.S. 813 for detailed guidance on this aspect.
A compartment used to enclose the appliance must be de-
signed and constructed specifically for this purpose. An existing compartment/cupboard may be utilised provided that it is
modified to suit.
This appliance is not suitable for external installation.
3A.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier – must be
checked to ensure that it is of adequate size to deal with the
maximum rated input of all the appliances that it serves. Installation pipes must be fitted in accordance with I.S. 813.
Pipe work from the meter to the appliance must be of adequate
size. Pipes of a smaller size than the appliance gas inlet connection must not be used. The installation must be tested for
tightness in accordance with I.S. 813.
If the gas supply serves more than one appliance, it must be
ensured that an adequate supply is maintained to each appliance when they are in use at the same time.
3A.4 FLUE SYSTEM
The terminal should be located where the dispersal of combustion
products is not impeded and with due regard for the damage
and discoloration that may occur to building products located
nearby. The terminal must not be located in a place where it
is likely to cause a nuisance (see I.S. 813).
In cold and/or humid weather, water vapour will condense
on leaving the terminal; the effect of such pluming must be
considered.
If installed less than 2m above a pavement or platform to
which people have access (including balconies or flat roofs)
11
the terminal must be protected by a guard of durable material.
The guard must be fitted centrally over the terminal. Refer to
I.S. 813, when the terminal is 0.5 metres (or less) below plastic
guttering or 1 metre (or less) below painted eaves.
3A.5 AIR SUPPLY
The following notes are intended for general guidance only.
This appliance is a room-sealed, fan-flued boiler, consequently it
does not require a permanent air vent for combustion air supply.
When installed in a cupboard or compartment, ventilation for
cooling purposes is also not required.
3A.6 WATER CIRCULATION
Specific recommendations are given in I.S. 813. The following
notes are for general guidance only.
3A.6.1 PIPEWORK
It is recommended that copper tubing be used in conjunction
with soldered capillary joints.
Where possible pipes should have a gradient to ensure air
is carried naturally to air release points and that water flows
naturally to drain cocks.
Except where providing useful heat, pipes should be insulated
to avoid heat loss and in particular to avoid the possibility of
freezing. Particular attention should be paid to pipes passing
through ventilated areas such as under floors, loft space and
void areas.
3A.6.2 AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass, consequently
there is no requirement for an external by-pass, however the
design of the system should be such that it prevents boiler
‘cycling’.
3A.6.3 DRAIN COCKS
These must be located in accessible positions to facilitate
draining of the appliance and all water pipes connected to the
appliance.
3A.6.4 AIR RELEASE POINTS
These must be positioned at the highest points in the system
where air is likely to be trapped. They should be used to expel
trapped air and allow complete filling of the system.
3A.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel to accommodate the increased volume of water when the system is
heated. It can accept up to 8 litres of expansion from within
the system, generally this is sufficient, however if the system
has an unusually high water content, it may be necessary to
provide additional expansion capacity (see 6.18).
3A.6.6 FILLING POINT
A method for initial filling of the system and replacing water lost
during servicing etc. is provided (see fig. 7). You should ensure
this method of filling complies with the local water authority
regulations.
3A.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of filling the system would be from an
independent make-up vessel or tank mounted in a position
at least 1 metre above the highest point in the system and at
least 5 metres above the boiler (see fig. 8). The cold feed from
the make-up vessel or tank must be fitted with an approved
non-return valve and stopcock for isolation purposes. The feed
pipe should be connected to the return pipe as close to the
boiler as possible.
3A.6.8 FREQUENT FILLING
Frequent filling or venting of the system may be indicative
of a leak. Care should be taken during the installation of the
appliance to ensure all aspects of the system are capable of
withstanding pressures up to at least 3 bar.
3A.7 ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V @ 50Hz electrical supply; it must be protected with a 3-amp fuse. The method
12
of connection to the mains electricity supply must allow for
complete isolation from the supply. The preferred method is by
using a double-pole switch fuse spur with a contact separation
of at least 3,5 mm (3° high-voltage category). The switch must
only supply the appliance and its corresponding controls, i.e.
time clock, room thermostat, etc.
3A.8 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be fitted on a wall of combustible material, there is no requirement for a sheet of fireproof material to
protect the wall.
3A.9 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed building, it
should be fitted in accordance with I.S. 813 and local Building
Regulations.
The Institute of Gas Engineers publication (IGE/UP/7) ‘Guide
for Gas Installations in Timber Frame Buildings’ gives specific
advice on this type of installation.
3A.10 INHIBITORS
Vokèra recommend that an inhibitor - suitable for use with
aluminium heat exchangers - is used to protect the boiler and
system from the effects of corrosion and/or electrolytic action.
The inhibitor must be administered in strict accordance with
the manufacturers instructions*.
*Water treatment of the complete heating system - including
the boiler - should be carried out in accordance with I.S. 813
and the Domestic Water Treatment Association’s (DWTA) code
of practice.
3A.11 DECLARATION OF CONFORMITY
A Declaration of Conformity (as defined in I.S. 813) must be
provided on completion of the installation.
A copy of the declaration must be given to the responsible
person and also to the gas supplier if required.
SECTION 4 - INSTALLATION
4.1 DELIVERY
Due to the weight of the appliance it may be necessary for
two people to lift and attach the appliance to its mounting. The
appliance is contained within a heavy-duty cardboard carton.
Lay the carton on the floor with the writing the correct way up.
4.2 CONTENTS
Contained within the carton is:
 the boiler
 the wall bracket
 carton template
 an accessories pack containing appliance service connections
and washers
 the instruction pack containing the installation, servicing & user
instructions, guarantee registration card and a 3-amp fuse.
29450126
29450127
29450128
529
1000mm extension
2000m extension
Telescopic extension
Wall bracket pack (5)
1000 mm
2000 mm
372/519 mm
208mm
Using the template provided, mark and drill a 125mm hole for
the passage of the flue pipe. The hole should be drilled to ensure
any condense fluid that forms, is allowed to drain back to the
appliance (see fig. 12-14). The fixing holes for the wall-mounting
bracket should now be drilled and plugged, an appropriate type
and quantity of fixing should be used to ensure that the bracket
is mounted securely.
Once the bracket (A) has been secured to the wall, mount the
appliance onto the bracket.
4.3 UNPACKING
At the top of the carton pull both sides open – do not use a
knife – unfold the rest of the carton from around the appliance,
carefully remove all protective packaging from the appliance and
lay the accessories etc. to one side. Protective gloves should
be used to lift the appliance, the appliance back-frame should
be used for lifting points.
A
4.4 PREPARATION FOR MOUNTING THE APPLIANCE
The appliance should be mounted on a smooth, vertical surface, which must be capable of supporting the full weight of the
appliance. Care should be exercised when determining the
position of the appliance with respect to hidden obstructions
such as pipes, cables, etc.
When the position of the appliance has been decided – using
the template supplied – carefully mark the position of the wall
mounting bracket (see fig. 11) and flue-hole (if applicable).
4.5 FITTING THE FLUE
The top flue outlet permits both horizontal and vertical flue applications to be considered, alternatively, the Vokèra twin flue
system can be utilised if longer flue runs are required.
4.5.1 CONCENTRIC HORIZONTAL FLUE
(For concentric vertical flue, see 4.5.2).
(For twin flue applications, see 4.5.3).
The appliance can be used with either the Vokèra condensing
60/100mm concentric flue system or the optional 80/125mm
concentric flue system.
NOTE
These instructions relate only to the Vokèra condensing
60/100mm concentric flue system. For specific details on the
installation of the 80/125mm concentric flue system please refer
to the instructions supplied. The appliance flue outlet elbow can
be rotated through 360º on its vertical axis. In addition the flue
may be extended from the outlet elbow in the horizontal plane
(see 2.9). A reduction must also be made to the maximum length
(see table below) when additional bends are used.
Reduction for additional bends
Bend
Reduction in maximum flue length for each bend
45º bend 1.0 metre (60/100) - 1.0 metre (80/125)
90º bend 1.0 metre (60/100) - 1.5 metre (80/125)
Horizontal flue terminals and accessories
Part No.
Description
Length
29450120
Horizontal flue kit
900 mm
29450121
Telescopic flue kit
455/630 mm
522
Plume management kit
1370 mm
29450123
90-degree bend
N/A
29450124
45-degree bends (pair)
N/A
29450125
500mm extension
500 mm
Fig. 9
Outer clamps
Terminal or
extension
Fig. 10
FITTING THE HORIZONTAL FLUE KIT
Carefully measure the distance from the centre of the appliance
flue outlet to the edge of the finished outside wall (dimension
X). Add 65mm to dimension X to give you Dimension Y (see
fig 16). Measure dimension Y from the terminal end of the concentric flue pipe and cut off the excess ensuring any burrs are
removed. Pass the concentric flue pipe through the previously
drilled hole. Fit the flue bend to the boiler flue outlet and insert
the concentric flue pipe into the flue bend ensuring the correct
seal is made. Using the clamp, gasket, and screws supplied,
secure the flue bend to the appliance flue spigot.
NOTE
Fit the internal (white) trim to the flue assembly prior to connecting the flue pipe to the bend.
You must ensure that the entire flue system is properly supported and connected. Seal the flue assembly to the wall using
cement or a suitable alternative that will provide satisfactory
weatherproofing. The exterior trim can now be fitted.
13
Attach the rear flue terminal to the appliance (using the previously retained screws) and fix the telescopic terminal to the
correct length (wall thickness) ensuring that the terminal will
protrude through the wall by the correct distance. At this point,
lift the appliance and carefully insert the terminal into and
through the wall, ensuring that the holes in the appliance back
frame are aligned with the studs on the wall bracket.
Seal the top flue outlet of the boiler with the blanking plate
provided with the rear flue kit (Fig. 14).
218
Fig. 11
EXTENDING THE FLUE
Connect the bend – supplied with the terminal kit – to the top
of the boiler using clamp (supplied) see fig. 10. The additional
bends & extensions have push-fit connections, care should be
taken to ensure that the correct seal is made when assembling
the flue system. Connect the required number of flue extensions or bends (up to the maximum equivalent flue length) to
the flue terminal (see fig. 10-12). The flue system should have
a minimum of 1º; maximum of 3º rise from the boiler to outside,
to ensure any condense fluid that forms, is allowed to drain
back to the appliance.
NOTE
When cutting an extension to the required length, you must
ensure that the excess is cut from the plain end of the extension. Remove any burrs, and check that all seals are located
properly. You must ensure that the entire flue system is properly
supported and connected. Seal the flue assembly to the wall using cement or a suitable alternative that will provide satisfactory
weatherproofing. The interior and exterior trim can now be fitted.
Fig.13
Fig.14
Fig.15
Fig. 12
4.5.1.2 FITTING THE REAR FLUE (fig. 13) (rear flue outlet
only)
Using the template provided, mark and drill a 125mm hole
for the passage of the flue pipe, see fig 9. The hole should
be drilled LEVEL to ensure any condense fluid that forms, is
allowed to drain back to the appliance. The fixing holes for
the wall mounting bracket should now be drilled and plugged,
an appropriate type and quantity of fixing should be used to
ensure that the bracket is mounted securely. Once the bracket has been secured to the wall, remove the blanking plate
from the rear of the boiler (Fig. 15).
NOTE The inner 60mm pipe of the rear flue terminal must be
cut by 12mm at the point indicated (fig.13 pos. A).
14
Using the screws and washers provided, secure the appliance
onto the wall bracket and tighten with a suitable spanner.
Seal the flue assembly to the wall using cement or a suitable
alternative that will provide satisfactory weatherproofing. The
exterior wall trim can now be fitted.
Part No.
29450133
Description
Length
Rear flue terminal
825mm
4.5.2 CONCENTRIC VERTICAL FLUE
The appliance can be used with either the Vokèra condensing
60/100mm concentric flue system or the optional 80/125mm
concentric flue system.
NOTE
These instructions relate only to the Vokèra condensing
60/100mm concentric flue system. For specific details on the
installation of the 80/125mm concentric flue system please refer
to the instructions supplied.
The vertical flue terminal can be connected directly to the appliance flue outlet. Alternatively, an extension or bend can be
connected to the appliance flue outlet if desired, however if
additional bends are fitted, a reduction must be made to the
maximum flue length (see table below).
Reduction for bends
Bend
Reduction in maximum flue length for each bend
45º bend
90º bend
1.0 metre (60/100) - 1.0 metre (80/125)
1.0 metre (60/100) - 1.5 metre (80/125)
Vertical flue terminal and accessories
Part No.
Description
29450122 Vertical flue terminal
531
Pitched roof flashing plate
532
Flat roof flashing plate
29450123 90-degree bend
29450124 45-degree bends (pair)
29450125 500mm extension
29450126 1000mm extension
29450127 2000mm extension
29450128 Telescopic extension
529
Wall bracket pack (5)
Length
1000 mm
N/A
N/A
N/A
N/A
500 mm
1000 mm
2000 mm
372/519 mm
208mm
Using the dimensions given in fig.16 as a reference, mark and
cut a 125mm hole in the ceiling and/or roof.
“X”
12/15/20HE = 202mm
25/30/35HE = 218mm
130mm
Fig. 16
Fit the appropriate flashing plate to the roof and insert the vertical flue terminal through the flashing plate from the outside,
ensuring that the collar on the flue terminal fits over the flashing.
The fixing holes for the wall-mounting bracket should now be
drilled and plugged, an ‘appropriate type and quantity of fixing
should be used to ensure that the bracket is mounted securely.
Once the bracket has been secured to the wall, mount the appliance onto the bracket.
IMPORTANT
The vertical flue terminal is 1.0 metre in length and cannot be
cut; therefore it may be necessary to adjust the height of the
appliance to suit or use a suitable extension.
Connect the vertical flue assembly to the boiler flue spigot using the 100mm clip, gasket & screws (supplied), ensuring the
correct seal is made. The flue support bracket (supplied with
the vertical flue kit) can now be fitted.
If the vertical flue requires extension/s or additional bend/s,
connect the required number of flue extensions or bends (up
to the maximum equivalent flue length) between the boiler and
vertical flue assembly.
Ensure that any horizontal sections of the flue system have a
minimum 1º; maximum 3º fall back to the boiler (1º = 17mm
per 1000mm).
NOTE
When cutting an extension to the required length, you must
ensure that the excess is cut from the plain end of the extension. Remove any burrs, and check that any seals are located
properly.
You must ensure that the entire flue system is properly supported and connected.
4.5.3 TWIN FLUE SYSTEM
The Vokèra twin flue system enables greater flue distances
to be achieved than that of a concentric flue system. It can be
used for horizontal or vertical applications, however the twin
flue system must be converted to the dedicated concentric
flue kit for termination. It is essential that the installation of the
twin flue system be carried out in strict accordance with these
instructions.
GUIDANCE NOTES ON TWIN FLUE INSTALLATION
• The flue must have a have a minimum 1º; maximum 3º (1º =
17mm per 1000mm) fall back to the appliance to allow any
condensate that may form in the flue system to drain via the
condensate drain. Consideration must also be given to the
fact that there is the possibility of a small amount of condensate dripping from the terminal.
• Ensure that the entire flue system is adequately supported,
use at least one bracket for each extension.
• As the exhaust outlet pipe can reach very high temperatures it must be protected to prevent persons touching the hot
surface.
• The condensate drain pipe must be connected in accordance with building regulations
Reduction for bends
Bend
Reduction in maximum flue length for each bend
45º bend
90º bend
1.0 metre
1.5 metre
Twin flue accessories
Part No.
Description
0225805
Horizontal flue terminal
0225810
Vertical flue terminal
359
Twin adapter kit
531
Pitched roof flashing plate
532
Flat roof flashing plate
0225815
Condensate drain kit
0225820
0.25m extension (pair)
0225825
0.5m extension (pair)
0225830
1.0m extension (pair)
0225835
2.0m extension (pair)
0225840
45º bend (pair)
0225845
90º bend (pair)
0225850
Twin bracket (5)
0225855
Single bracket (5)
Length
1.0 metre
1.0 metre
N/A
N/A
N/A
N/A
250mm
500mm
1000mm
2000mm
N/A
N/A
N/A
N/A
MOUNTING THE BOILER
The fixing holes for the wall-mounting bracket should now be
drilled and plugged, an appropriate type and quantity of fixing
should be used to ensure that the bracket is mounted securely.
Once the bracket has been secured to the wall, mount the appliance onto the bracket.
15
INSTALLATION OF TWIN ADAPTOR KIT (fig. 18 & 19)
 Insert the exhaust connection manifold (A) onto the appliance
flue outlet.
 Remove the blanking plate (located to the left of the appliance
flue outlet) and – using the same screws – install the air inlet
plate (B).
 Using the hole in the exhaust connection manifold as a guide,
drill a 3mm hole in the appliance flue spigot and secure the
exhaust manifold connection to the flue spigot using the screw
provided (C).
 Using the two holes in the air inlet plate as a guide, drill a
3mm hole in each and secure the air inlet pipe/bend using
the screws provided.
The twin flue pipes extensions and accessories can now be
installed by pushing together (the plain end of each extension
or bend should be pushed approximately 50mm into the female
socket of the previous piece).
B
A
C
Fig.18
NOTE
Seal the flue terminal assembly to the wall using cement or a
suitable alternative that will provide satisfactory weatherproofing. The interior and exterior trim can now be fitted.
VERTICAL TERMINATION (fig. 21)
The twin flue system must be converted to the dedicated concentric flue kit for termination.
 The vertical terminal is supplied with a built-in converter box
and cannot be shortened.
 A 130mm hole is required for the passage of the concentric
terminal through the ceiling and/or roof.
Depending on site conditions it may be preferable to install the
terminal assembly prior to fitting the twin flue pipes.
Fit the appropriate flashing plate to the roof and insert the vertical flue terminal through the flashing plate from the outside,
ensuring that the collar on the flue terminal fits over the flashing.
Push-fit the twin flue pipes onto the concentric to twin converter
ensuring that the exhaust pipe connects to the exhaust connection on the concentric to twin converter.
If necessary cut the plain ends (male) of the twin flue pipes to
allow connection to the concentric to twin converter.
NOTE
 Before cutting twin flue pipes ensure allowances have been
made for connection onto the previous piece and onto the
concentric to twin converter. The last twin flue pipes must
be pushed 50mm onto the male spigots of the concentric to
twin converter.
 You must ensure that the entire flue system is properly supported and connected.
 Ensure that any horizontal sections of pipe have a fall
of between 1 & 3º towards the appliance (1º =17mm per
1000mm).
1-deg = 17mm
Fig. 19
Fig. 20
HORIZONTAL TERMINATION (fig. 20)
The twin flue system must be converted to the dedicated concentric flue kit for termination.
 The horizontal terminal is supplied with a built-in converter
box and cannot be shortened.
 A 130mm hole is required for the passage of the concentric
terminal through the wall.
 The air inlet pipe must always be level with or below, that of
the exhaust pipe.
Depending on site conditions it may be preferable to install the
terminal assembly prior to fitting the twin flue pipes.
Mark and drill a level 130mm hole for the passage of the horizontal
flue terminal. Insert the terminal assembly into the flue hole.
Push-fit the twin flue pipes onto the concentric to twin converter
box ensuring that the exhaust pipe connects to the exhaust
connection on the concentric to twin converter.
If necessary cut the plain ends (male) of the twin flue pipes to
allow connection to the concentric to twin converter.
NOTE
Before cutting twin flue pipes ensure allowances have been
made for connection onto the previous piece and onto the
concentric to twin converter. The last twin flue pipes must be
pushed 50mm onto the male spigots of the concentric to twin
converter.
Fig. 21
16
4.6 CONNECTING THE GAS AND WATER
The appliance is supplied with an accessory pack that includes
service valves, sealing washers’ etc, for use with the service
valves.
4.6.1 GAS (fig. 22)
The appliance is supplied with a 15mm service valve, connect
a 15mm pipe to the inlet of the valve and tighten both nuts.
NOTE
It will be necessary to calculate the diameter of the gas supply
pipe to ensure the appliance has an adequate supply of gas.
4.6.2 FLOW & RETURN (fig. 22)
The appliance is supplied with 22mm service valves for the
flow and return connections, connect a 22mm pipe to the inlet
of each valve and tighten both nuts.
NOTE
Depending on system requirements, it may necessary to increase the size of the flow & return pipe work after the service
valve connections.
4.7 ELECTRICAL CONNECTIONS
The boiler is supplied with a 2-metre fly-lead. This lead can be
used for connection to the electrical supply. Connect the fly-lead
to a fused plug or fused isolator in the following way:
• brown wire to LIVE supply
• blue wire to NEUTRAL supply
• green/yellow to EARTH connection.
Insert the supplied 3-AMP fuse into the fused isolator or fused plug.
Should the fly-lead be unsuitable, refer to 4.7.3 for details on
how to connect the electrical supply directly to the boiler.
The electrical supply must be as specified in section 3/3A. A
qualified electrician should connect the appliance to the electrical
supply. If controls - external to the appliance - are required, a
competent person must undertake the design of any external
electrical circuits, please refer to section 8 for detailed instructions. ANY EXTERNAL CONTROL OR WIRING MUST BE
SERVED FROM THE SAME ISOLATOR AS THAT OF THE
APPLIANCE. The supply cable from the isolator to the appliance
must be 3-core flexible sized 0.75mm to BS 6500 or equivalent.
Wiring to the appliance must be rated for operation in contact
with surfaces up to 90 ºC.
4.7.1 CASING REMOVAL (fig. 23)
To gain internal access to the appliance you must first remove
the casing, proceed as outlined below:
• locate and unscrew the 2-screws (A) that secure the outer
casing to the appliance
• lift the casing upward to disengage it from the top locating
hooks and then remove
• store the casing and screws safely until required. Re-fit in
the reverse order
• remove the retaining screw below the control fascia and
gently lower it until it rests.
C/H flow
valve
Safety valve outlet
Gas
cock
C/H return
valve
Fig. 22
4.6.3 SAFETY VALVE (fig. 22)
Connect the safety valve connection pipe to the safety valve
outlet. Connect a discharge pipe to the other end of the safety
valve connection pipe and tighten. The discharge pipe must
have a continuous fall away from the appliance to outside and
allow any water to drain away thereby eliminating the possibility of freezing. The discharge pipe must terminate in a position
where any water – possibly boiling – discharges safely without
causing damage or injury, but is still visible.
4.6.4 CONDENSE PIPE
During normal operation the boiler produces condense which
is collected in a trap located in the lower part of the boiler. A
flexible pipe (condense outlet pipe) is connected to the outlet
of the trap. The flexible pipe must be connected to a plastic
waste pipe only. The plastic waste pipe must have a minimum
of a 3º fall towards the drain. Any external run of pipe should
be insulated to prevent the risk of freezing.
4.6.5 CONNECTING THE CONDENSATE OUTLET
Gently pull the condense outlet pipe down from its location
inside the boiler until approximately 100mm protrudes from the
underside of the boiler, care should be taken to ensure that the
pipe connection to the trap remains secure. Connect a suitable
plastic (not copper) pipe (no less than 21mm diameter) to the
outlet pipe and ensure it discharges in accordance with local
building regulations or other rules in force.
4.7.2 APPLIANCE TERMINAL BLOCK
The appliance terminal block is located on the rear of the control
fascia. Remove the casing as described in 4.7.1. Gently pull
the control panel forwards and down. Locate the terminal block
cover (fig. 24).
NOTE
The appliance comes with a factory fitted link (‘TA’) to allow
basic operation of the boiler via the mode selector switch. If it is
anticipated that external controls will be required please refer to
the wiring diagrams in section 8 for more detailed information.
4.7.3 CONNECTING THE MAINS (230V) INPUT
Unhook and remove the terminal block cover (230V). Pass the
cable through the cable anchorage point. Connect the supply
cable wires (LIVE, NEUTRAL, & EARTH) to their corresponding
terminals (L, N, & E) on the appliance – high voltage – terminal
block. When connecting the EARTH wire, ensure that it’s left
slightly longer that the others, this will prevent strain on the
EARTH wire should the cable become taut.
The securing screw on the cable anchorage should now be
tightened. This must be done before the terminal block cover
is re-fitted in its position.
NOTE
It is the installer’s responsibility to ensure that the appliance is
properly Earthed. Vokèra Ltd. cannot be held responsible for any
damages or injuries caused as a result of incorrect Earth wiring.
A
Fig. 23
Fig. 24
17
SECTION 5 - COMMISSIONING
5.1 GAS SUPPLY INSTALLATION
Inspect the entire installation including the gas meter, test for
tightness and purge. Refer to BS 6891 (I.S. 813 in ROI) for
specific instruction.
5.2 THE HEATING SYSTEM
analysis check to ensure that correct combustion is occurring.
If there are no means to carry out a combustion analysis
check, then it will not be possible to complete the commissioning procedure.
Details on how to carry out the combustion analysis can be
found in section 7.
The appliance contains components that may become damaged
or rendered inoperable by oils and/or debris that are residual
from the installation of the system, consequently it is essential
that the system be flushed in accordance with the following
instructions.
IMPORTANT
It’s imperative that a sufficient dynamic – gas – pressure is
maintained at all times. Should the dynamic gas pressure fall
below an acceptable level, the appliance may malfunction or
sustain damage.
5.3 INITIAL FILLING OF THE SYSTEM
5.8 FINAL FLUSHING OF THE HEATING SYSTEM
The system shall be flushed in accordance with BS 7593 (I.S.
813 ROI). Should a cleanser be used, it must be suitable for
Aluminium heat exchangers. It shall be from a reputable manufacturer and shall be administered in strict accordance with the
manufacturers’ instructions and the DWTA code of practice.
NOTE
Chemicals used to cleanse the system and/or inhibit corrosion
must be pH neutral, i.e. they should ensure that the level of the
pH in the system water remains neutral. Premature failure of
certain components can occur if the level of pH in the system
water is out-with normal levels.
Ensure both flow and return service valves are open, remove
appliance casing as described in 4.7.1, identify the automatic air
release valves (AAV) and loosen the dust cap/s by turning the
cap anti-clockwise one full turn. Ensure all manual air release
valves located on the heating system are closed. Connect the
filling loop as shown in fig. 4, slowly proceed to fill the system
by firstly opening the inlet valve connected to the flow pipe, and
then turning the lever on the fill valve, to the open position. As
water enters the system the pressure gauge will begin to rise.
Once the gauge has reached 1 BAR close both valves and begin
venting all manual air release valves, starting at the lowest first.
It may be necessary to go back and top-up the pressure until
the entire system has been filled. Inspect the system for water
tightness, rectifying any leaks.
5.4 INITIAL FLUSHING OF THE SYSTEM
The whole of the heating system must be flushed both cold
and hot as detailed in 5.8. Open all radiator or heating valves
and the appliance flow & return service valve. Drain the boiler
and system from the lowest points. Open the drain valve full
bore to remove any installation debris from the boiler prior to
lighting. Refill the boiler and heating system as described in 5.3.
5.5 PRE-OPERATION CHECKS
Before attempting the initial lighting of the appliance, the following checks must be carried out:
 ensure all gas service valves from the meter to the appliance
are open and the supply pipe has been properly purged;
 ensure the proper electrical checks have been carried out, (see
7.8) particularly continuity, polarity and resistance to earth;
 ensure the 3 AMP fuse – supplied with the appliance – has
been fitted;
 ensure the system has been filled, vented and the pressure
set to 1 BAR;
 ensure the flue system has been fitted properly and in accordance with the instructions;
 ensure all appliance service valves are open.
5.6 INITIAL LIGHTING
Ensure the electrical supply to the appliance is switched on.
Ensure any external controls are switched to an ‘ON’ position
and are calling for heat. Move the selector switch to the ON
position, the appliance will now operate as described in 1.2.
Should the appliance fail to ignite, refer to 5.6 and/or section 7
(mode of operation, parameter setting & faultfinding).
5.7 CHECKING GAS PRESSURE AND COMBUSTION
ANALYSIS
The appliance is factory set so should require no additional
adjustment once installed. However to satisfy the requirements of GSIUR 26/9 (I.S. 813 ROI), it will be necessary to
gas rate the appliance using the gas meter that serves the
appliance and carry out a combustion analysis check in accordance with BS 7967 (UK) to ensure that correct combustion is
occurring, see flow chart on page 36.
Additionally, if the gas valve has been adjusted, replaced, or
the appliance has been converted for use with another gas
type, then it becomes necessary to carry out a combustion
18
5.8.1 INHIBITORS
See Section 3 “General Requirements”.
5.9 SETTING THE FLOW OUTLET TEMPERATURE
The flow outlet temperature can be adjusted between 40 °C 80 °C for standard CH system by using the Heating thermostat
knob (see fig.1).
5.10 SETTING THE SYSTEM DESIGN PRESSURE
The design pressure should be a minimum of 0.5 BAR and a
maximum of 1.5 BAR. The actual reading should ideally be 1
BAR plus the equivalent height in metres (0.1 BAR = 1 metre)
to the highest point in the system above the base of the appliance (up to the maximum of 1.5 BAR total).
N.B. The safety valve is set to lift at 3 BAR/30 metres/45 psig.
To lower the system pressure to the required value, drain off
some water from the appliance drain valve until the required
figure registers on the pressure gauge (see fig. 1).
5.11 REGULATING THE CENTRAL HEATING SYSTEM
Fully open all radiator and circuit valves and run the appliance
for both heating and hot water until heated water is circulating.
If conditions are warm remove any thermostatic heads. Adjust
radiator return valves and any branch circuit return valves
until the individual return temperatures are correct and are
approximately equal.
5.12 FINAL CHECKS
• ENSURE ALL TEST NIPPLES ON THE APPLIANCE GAS
VALVE ARE TIGHT AND CHECKED FOR TIGHTNESS.
• ENSURE THE APPLIANCE FLUE SYSTEM IS FITTED
CORRECTLY AND IS PROPERLY SECURED.
• ENSURE ALL PIPE WORK IS RE-CHECKED FOR TIGHTNESS.
• RE-FIT APPLIANCE CASING.
• COMPLETE BENCHMARK CHECKLIST.
FOR UK ONLY
Complete details of the boiler, controls, installation and commissioning in the Benchmark checklist at the back of this
book. It is important that the Benchmark checklist is correctly
completed and handed to the user. Failure to install and commission the appliance to the manufacturers instructions will
invalidate the warranty.
5.13 INSTRUCTING THE USER
Hand over all documentation supplied with this appliance –
including these instructions – and explain the importance of
keeping them in a safe place.
Explain to the user how to isolate the appliance from the gas,
water and electricity supplies and the locations of all drain
points. Show the user how to operate the appliance and any
associated controls correctly.
Show the user the location of the filling valve and how to topup the system pressure correctly and show the location of all
manual air release points.
Explain to the user how to turn off the appliance for both long
and short periods and advise on the necessary precautions to
prevent frost damage.
Explain to the user that for continued safe and efficient operation,
the appliance must be serviced annually by a competent person.
IMPORTANT
To validate the appliance warranty, it’s necessary to register
the appliance details with us. The warranty can be registered
in several ways:
 by completing the warranty registration card and posting to
us using the envelope supplied
 online at: vokera.co.uk
 for UK residents by calling: 0870 607 0281
 for ROI residents by calling: 056 6655057.
SECTION 6 - SERVICING INSTRUCTIONS
6.1 GENERAL
Once the appliance has been serviced, the benchmark Service
Record must be completed.
For UK only: It is important that the Benchmark Service Record
is correctly completed and handed to the user. Failure to install
and commission the appliance to the manufacturers instructions
will invalidate the warranty.
To ensure the continued safe and efficient operation of the appliance, it is recommended that it is checked and serviced at
regular intervals. To ensure correct and safe operation of the
appliance, it is essential that any worn or failed component be
replaced only with a genuine Vokèra spare part. It should be
remembered that although certain generic components may
look similar, they will be specific to an individual appliance or
product range. Use of non-genuine Vokèra spare parts could
invalidate your warranty and may pose a potential safety hazard. The frequency of servicing will depend upon the particular
installation conditions, but in general, once per year should be
sufficient. It is the law that any servicing work is carried out by
competent person such as a Vokèra engineer, an approved
service agent, British Gas, GAS SAFE registered personnel
or other suitably qualified personnel. The following instructions apply to the appliance and its controls, but it should be
remembered that the central heating and the domestic hot
water systems would also require attention from time to time.
6.2 ROUTINE ANNUAL SERVICING
• Check the operation of the appliance and ensure it functions
as described in section 7.
• Compare the performance of the appliance with its design
specification. The cause of any noticeable deterioration
should be identified and rectified without delay.
• Thoroughly inspect the appliance for signs of damage or
deterioration especially the flue system and the electrical
apparatus.
• Check and adjust – if necessary – all burner pressure settings
(see 7.4).
• Check and adjust – if necessary – the system design pressure (see 5.10).
• Carry out an analysis of the flue gases (see 7.3), and visually
check the condition of the entire flue assembly.
• Compare the results with the appliance design specification.
Any deterioration in performance must be identified and rectified without delay.
• Check that the main heat exchanger is clean and free from
any debris or obstruction.
• Check and clean – if necessary – the condense trap to ensure
correct operation.
The flame side of the burner is made of state-of-the-art material.
Being fragile:
- be particularly careful when handling, mounting or dismantling
the burner and adjacent components (e.g. electrodes, insulation panelling etc.)
- avoid direct contact with any cleaning appliance (e.g. brushes,
aspirators, blowers, etc.).
This component does not need any maintenance, please do
not remove it from its housing, except where the O-ring may
have to be replaced.
The manufacturer declines all responsibility in cases of damages
due to failing to observe the above.
6.3 REPLACEMENT OF COMPONENTS
Although it is anticipated that this appliance will give years of
reliable, trouble free service, the life span of components will be
determined by factors such as operating conditions and usage.
Should the appliance develop a fault, the fault finding section
will assist in determining which component is malfunctioning.
6.4 COMPONENT REMOVAL PROCEDURE
To remove a component, access to the interior of the appliance
is essential. Isolate the appliance from the electrical supply and
remove the fuse. And when necessary, close all service valves
on the appliance, remove the appliance casing as described
in section 4.7.1 and drain the water content from the appliance
via the drain valve. Ensure some water absorbent cloths are
available to catch any residual water that may drip from the
appliance or removed component. Undertake a complete commissioning check as detailed in section 5, after replacing any
component. ALWAYS TEST FOR GAS TIGHTNESS IF ANY
GAS CARRYING COMPONENTS HAVE BEEN REMOVED
OR DISTURBED.
6.4.1 AIR BOX FRONT COVER REMOVAL (fig. 25)
Locate the 4 screws and remove air box front cover.
Fig. 25
19
6.5 PUMP ASSEMBLY (fig. 26)
Carry out component removal procedure as described in 6.4.
Disconnect the flow pipe (B) from the combustion chamber
connection, slacken the pipe (C) at the hydraulic assembly
and swing/rotate clear of the pump assembly.
Remove the expansion pipe locking pin (D) from the top of the
pump assembly and withdraw the flexible pipe. Locate and
remove the pressure gauge securing pin (Dx) and disconnect
the pressure gauge from the pump assembly. Disconnect the
electrical wiring from the pump’s electrical connection point (E).
Locate and remove the 2 securing screws (A) at the rear of the
pump assembly. Remove locking pin (F) from pump base and
lift pump assembly clear of the hydraulic manifold. The pump
assembly can now be removed from the appliance. Replace
carefully in the reverse order.
6.6 SAFETY VALVE (fig. 27)
Carry out component removal procedure as described in 6.4.
Disconnect the outlet pipe from the safety valve (I), remove
safety valve locking pin (L) from the hydraulic manifold. Replace
in the reverse order.
C
H
D
G
B
Dx
A
E
F
Fig. 26
6.7 LOWER AUTOMATIC AIR RELEASE VALVE
(fig. 26)
Carry out component removal procedure as described in 6.4.
Remove the expansion pipe locking pin (D) from the pump assembly and remove the expansion pipe. Locate and remove
the AAV locking pin (G) from the pump assembly and remove
the AAV assembly (H). Replace in the reverse order.
6.7.1 TOP AUTOMATIC AIR RELEASE VALVE (fig. 28)
Carry out component removal procedure as described in 6.4.
Unclip and remove the air chamber front cover. Remove the
AAV locking pin (M) from the deaerator assembly and remove
the AAV assembly (N). Replace in the reverse order.
L
I
Fig. 27
6.8 WATER PRESSURE SWITCH (fig. 29)
N
Carry out component removal procedure as described in 6.4.
Locate and remove the locking pin (O) from the water pressure switch. Remove the wiring. Carefully withdraw the switch.
Replace in the reverse order.
M
6.9 FLOW THERMISTOR (fig. 3 - pos. 11)
Carry out component removal procedure as described in 6.4.
Unclip and remove the air chamber front cover. Unclip the flow
thermistor from the flow outlet pipe. Disconnect thermistor
electrical plug. Replace in the reverse order.
Fig. 28
6.10 RETURN THERMISTOR (fig. 3 - pos. 8)
Carry out component removal procedure as described in 6.4.
Unclip the return thermistor from the return inlet pipe. Disconnect thermistor electrical plug. Replace in the reverse order.
6.11 PRINTED CIRCUIT BOARD (fig. 30)
Carry out component removal procedure as described in 6.4.
Pull the control fascia forward and lower it. Push the clips (P)
which secure the PCB cover, remove cover, after carefully taking note of all wiring connections and jumper tag configuration.
Unhook and remove connection block (Q). Disconnect all wiring
from the PCB, locate and remove the PCB securing screws,
remove the required PCB. Replace in the reverse order ensuring that the position of the 2 control knobs are correctly aligned
with the respective potentiometers on the PCB.
Ensure that the correct jumper tag configuration has been
respected. It will be necessary to check the functioning of the
PCB is set for the correct boiler type/application.
O
K
Fig. 29
Q
P
Fig. 30
20
6.12 GAS VALVE (fig. 31)
R
V
Carry out component removal procedure as described in 6.4.
The gas valve must be changed as complete unit. Disconnect
the electrical plug and leads from the gas valve, slacken and
unscrew gas valve inlet and outlet connections. Please note,
the sealing washers (R) must be discarded and replaced with
new sealing washers. Disconnect the compensation pipe (S).
Locate and remove gas valve retaining screws (T) on the
underside of the boiler if required, the gas valve can now be
removed. Replace in the reverse order. Check and adjust burner
pressure settings.
WARNING, A GAS TIGHTNESS CHECK MUST BE CARRIED OUT.
U
R
S
T
Fig. 31
6.12.1 INJECTOR
Carry out component removal procedure as described in 6.4
- Remove the mixer as described in 6.14.
- unscrew the screws fixing the plastic Venturi to the aluminium shell
- Loosen the plastic Venturi (B1) by levering from under the
teeth (be careful not to force them) and press from the opposite side until it is completely extracted from the aluminium shell.
- Using a CH6 wrench remove and don’t use again the 2 nozzles (see details in figure)
- Clean plastic traces
- Press in the 2 new nozzles from the kit as far as the threaded part, then screw in tightly
- Reassemble the mixer with the flap in an horizontal position
- Replace in the reverse order.
- Check the number of fan speed
W
Fig. 32
B
B
6.13 ELECTRODES & CONDENSE SENSOR (fig. 32)
Carry out component removal procedure as described in 6.4.
Unclip and remove the air chamber front and RH side covers.
Disconnect the electrode leads and ancillary wiring from their
respective connectors. Remove the retaining screws (W) for
electrode and remove.
6.14 FLUE FAN & MIXER (fig. 34)
Carry out component removal procedure as described in 6.4.
Unclip and remove the air chamber front and the RH side covers. Slacken the gas pipe (A1) at the air box connection and
swing/rotate away from the fan assembly. Locate and remove
the sense electrode. To remove the mixer (B1) locate and
remove the three screws (C1). To remove the fan (D1), disconnect the electrical connections attached to the fan, locate and
remove the four screws (E1). Gently ease the fan from its location. Replace in the reverse order. Ensure all seals are in good
condition, taking care to ensure they are replaced correctly.
A
INJECTOR G20
Mynute i20
Mynute i30
G31
A
4.7 flap side
3.4 flap side
B
4.2 free side
3.25 free side
A
5.1 flap side
3.55 flap side
B
4.7 free side
3.55 free side
Fig. 33
G1
6.15 BURNER (fig. 34)
Carry out component removal procedure as described in
6.4. Unclip and remove the air chamber front and the RH side
covers. Slacken the gas pipe (A1) at the air box connection
and swing/rotate of the fan assembly. Locate and remove the 3
internal nuts (F1) which secure the fan assembly in position to
the heat exchanger (G1). Disconnect the electrode leads and
ancillary wiring from their respective connectors. Remove the
retaining screws (fig. 36) for sensing electrode and remove.
Gently ease the fan assembly out of its location.
Ensure the seal is in good condition, taking care to ensure it
is replaced correctly.
Replace in the reverse order.
D1
A1
F1
B1
Fig. 34
C1
E1
21
6.16 MAIN HEAT EXCHANGER (fig. 35)
Carry out component removal procedure as described in 6.4.
Unclip and remove the three air chamber covers (front, LH, RH
sides). Disconnect all the wiring connections. Fig. 36: Slacken
the gas pipe (L1) at the air box connection and swing/rotate of
the fan assembly. Disconnect the flow (M1), return (N1) and
condense connections on the heat exchanger. Remove fan and
mixer as described in 6.14. Locate and remove the 2-screws
that secure the heat exchanger retaining clips and remove
clips (O1). Pull the heat exchanger forward and disconnect it
from the flue collector (P1). The heat exchanger can now be
withdrawn from the appliance.
Replace in the reverse order. Ensure all seals are in good
condition, taking care to ensure they are replaced correctly.
P1
L1
N1
M1
O1
6.17 AUTOMATIC BY-PAS (fig. 36)
Carry out component removal procedure as described in 6.4.
Remove the locking pin (Q1) that secures the cover (R1) to
the hydraulic manifold. Using a hooked piece of wire, carefully
withdraw the by-pass cartridge (S1). Ensure all seals are in
good condition, taking care to ensure they are replaced correctly. Replace in the reverse order ensuring the cartridge is
facing the correct way.
6.18
Fig. 35
R1
EXPANSION VESSEL
Should the removal and replacement of the expansion vessel
be deemed impractical, an external expansion vessel may be
fitted to the return pipe as close to the appliance as possible.
6.18.1 EXPANSION VESSEL REMOVAL (with sufficient
clearance above, fig. 37)
Carry out component removal procedure as described in 6.4.
Disconnect the flue from the appliance. Disconnect the expansion vessel from the flexible expansion pipe. Disconnect the
flexible expansion pipe from the vessel. Unscrew the nut that
secures the vessel to the lower frame. Locate and remove the
6 screws (U1) that secure the vessel top holding plate (V1),
remove the plate. The expansion vessel can now be removed.
Replace in the reverse order. Ensure all seals are in good
condition, taking care to ensure they are replaced correctly.
S1
Q1
Fig. 36
U1
6.19 CONDENSE TRAP REMOVAL (fig. 38)
Carry out component removal procedure as described in 6.4.
Disconnect the 2 upper rubbers condense pipe (W1). Remove
the pin (X1) that secures the trap to the air box plate. Disconnect the lower rubber condense pipe from the condense trap.
Carefully remove the condense trap. Remove the 2 screws
(Y1) and clean the condense trap.
Replace the component taking care the longer pipe on the
cover is positioned on the right side.
Disconnect the the locking pin (Z1) that secures the trap to
the air condense pipe. Disconnect the lower rubber condense
pipe from the condense trap. Carefully remove the condense
trap. For cleaning unlock the upper and lower closing plug (J1).
Replace in the reverse order.
W1
X1
22
V1
Fig. 37
Z1
Y1
Fig. 38
J1
6.20 FLUE COLLECTOR REMOVAL (fig. 39)
A2
Carry out component removal procedure as described in 6.16.
Locate and remove the screw (A2) that secures the flue gas
analysis test point cover (B2). Remove the clip and the fumes
thermostat (C2). Locate and remove the screws (D2) that secure the flue collector to the combustion chamber Gently pull
forward and ease the flue collector from its location. Replace
in the reverse order.
B2
C2
D2
Fig. 39
23
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 tightness, water tightness and the electrical integrity of the appliance.
7.2 APPLIANCE MODES OF OPERATION
NOTE
There must be sufficient system water pressure (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 and the low-pressure fault code will be indicated.
7.2.1 SELECTOR SWITCH IN THE OFF POSITION
When the selector switch is in the OFF position, the following
functions are active.
Active functions:
frost-protection system
pump anti-block.
7.2.2 ON-BOARD FUNCTIONS
 CO FUNCTION: the CO function when activated, will allow
the appliance to run at CH maximum, whilst a combustion
analysis check or a mechanical gas valve calibration is being
carried out. Whilst the CO function is active, all other functions
are disabled (minimum power operating period, anti-cycle,
set-point, etc). Once enabled, the CO function will remain
active for a 15-minute period, or until the function is manually
deactivated.
 FROST-PROTECTION: this function is only active when there
are no requests for heating or HW. If the temperature drops
below 5°C, the boiler will operate on minimum power until
the temperature of the thermistors reaches 35°C . Thereafter
the pump & fan will over-run for 30-seconds.
 ANTI-CYCLE FUNCTION: the anti-cycle function ensures the
burner remains switched off for at least 3-minutes after the
set-point hysterisis (set-point + 5-deg) for CH heat request.
 PUMP ANTI-BLOCK FUNCTION: when there has been no
heating or HW request for 24-hours, the anti-block cycle is
activated. The pump will be activated for a period of 30-seconds.
 SARA function: the SARA function permits the boiler (when
the set-point is within the SARA range) to automatically adjust
(raise) the heating flow outlet temperature should the room
thermostat contacts remain closed for more that 20-minutes.
7.2.3 HEATING MODE
With the selector switch in the heating & hot water position
and any additional controls (time clock, programmer, room
thermostat, etc.) calling for heat, the appliance will operate
in the heating mode. The pump and fan will be activated via
the flow temperature sensor. When the fan is sensed to be
operating correctly (tacho signal), the ignition sequence commences. Ignition is sensed by the electronic circuit to ensure
flame stability at the burner. Once successful ignition has been
achieved, the electronic circuitry increases the gas rate to 75%
for a period of 15 minutes.
The speed of the fan and therefore the output of the boiler is
determined by the temperature of the water sensed by the
flow temperature sensor, consequently a high temperature at
the flow sensor results in a lower fan speed. As the water temperature increases, the temperature sensors – located on the
flow pipe of the boiler – reduce the fan speed via the electronic
circuitry. Depending on the load, either the water temperature
will continue to rise until the set point is achieved or the water
temperature will fall whereby fan speed will increase relative to
the output required. When the boiler has reached the set point
(+ hysterisis), the burner will switch off. The built-in anti-cycle
device prevents the burner from re-lighting for approximately
3-minutes. When the temperature of the flow sensor falls below
the set point (- hysterisis), the burner will re-light.
24
NOTE
If the spark/sensing electrode does not sense ignition the appliance will re-attempt ignition a further 4-times then go to lockout.
When the set-point has been reached (the position of the heating
temperature selector) as measured 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.
If the temperature continues to rise and exceeds the set-point
by 5°C (hysterisis), the burner will shut down. A new ignition
sequence will be enabled when the 3- minute anti-cycle has
been performed and the temperature at the primary thermistor
has dropped 5°C (hysterisis) below the set-point.
ATTENTION
Gas type and appliance output must be set according to the
specific appliance specification. Vokèra accepts no responsibility if the gas type is not correctly adjusted according to the
respective appliance specification as detailed on the appliance
data badge.
7.3 CHECKING THE CO2 AND ADJUSTING THE
GAS VALVE
THE GAS VALVE MUST BE SET-UP OR ADJUSTED WITH
THE AID OF A PROPERLY CALIBRATED FLUE GAS
ANALYSER.
Isolate the appliance from the electrical supply and remove
the appliance casing as described in 4.7.1, to gain access to
the printed circuit board, locate and open the closing plug on
the dash board (L2), Restore the electrical supply to the boiler
and switch the boiler to the OFF mode. locate and press the
CO button (see fig. 40 pos. SW1). Press the button the number of times according the function requirement as par 7.3.1.
Set the flue gas analyser to read CO2 and insert the probe
into the flue analysis test point.
L2
SW1
use the supplied
screwdriver to push the
CO botton (SW1)
7.3.1 CO2 FUNCTION SETTINGS
Locate the CO button (see 7.3)
Select the main selector switch in position
Fig. 40
CO2 FUNCTIONS
ACTION ON THE BUTTON
LED STATUS
ACO
ACO
ACO
combustion analysis mode
press once = burner running at maximum heating
gas valve maximun setting (*)
press twice = burner running at maximum absolute
gas valve minimum setting
press three time = burner running at minimum
(*) this step has not to be used for the system boiler. If you find in this situation press the button once again.
NOTE
1 - Any additional pressing of CO button after the third time the burner switched between maximum absolute and minimum.
2 - To restart the CO function it is necessary to pass throught the
position with the main selector switch
7.3.2 GAS VALVE MAXIMUM SETTING
Set the CO2 button at maximum heating (see 7.3.1), once the
maximum heating is obtained (only yellow led blinking) check
that it corresponds with the appropriate CO2 value (Maximum)
for the respective appliance (see 2.11). If the CO2 reading is
correct, proceed to gas valve minimum setting (7.3.3).
However, if the CO2 reading is incorrect, the maximum gas
pressure must be adjusted as follows:
 using a 2.5mm Allen key, very slowly turn the maximum adjustment screw (see fig. 41) – clockwise to decrease, counter
clockwise to increase – until the correct value is displayed on
the CO2 analyser (allow time for the analyser to stabilise).
7.3.3 GAS VALVE MINIMUM SETTING
Set the CO2 button at minimum (see 7.3.1), once the minimum
is obtained (yellow led blinking + green led fixed) check that it
corresponds with the appropriate CO2 value (Minimum) for the
respective appliance (see 2.11). If the CO2 reading is correct,
proceed to completion (7.3.4).
However, if the CO2 reading is incorrect, the minimum gas
pressure must be adjusted as follows:
• locate the minimum adjustment screw (fig. 41), using a suitable screwdriver remove the protection plug
• using a 4mm Allen key, very slowly turn the minimum adjustment screw (see fig. 41) - clockwise to increase, counter
clockwise to decrease - until the correct value is displayed
on the CO2 analyser (allow time for the analyser to stabilise).
7.3.4 COMPLETION
On completion of the combustion analysis check and/or any
gas valve adjustment, refit the plug (fig. 40 L2) and move the
mode selector through
position. Remove the test probe
from the test point and refit the sealing screw/s and/or cap.
IMPORTANT
A GAS TIGHTNESS CHECK MUST BE CARRIED OUT IF
ANY GAS CARRYING COMPONENTS HAVE BEEN REMOVED, REPLACED OR DISTURBED.
7.4 COMBUSTION ANALYSIS TEST
A combustion analysis check can easily be carried out on the
appliance via the test points located on the top of the appliance (see 7.3).
 Insert the flue gas analyser probe into the flue gas test point
Maximum
screw
Compensation pipe
connection
Inlet gas pressure
connection
Minimum
screw
fig. 41
 Operate the boiler in combustion analysis mode (see 7.3.1)
and compare the values with those shown in section 2 (Nat.
Gas) or section 10 (LPG). If different adjust the gas valve
according to 7.3.1, 7.3.2, & 7.3.3.
Note: If a measured CO/CO2 ratio of 0.004/1 or less AND a
CO reading of less than 350ppm cannot be achieved, please
contact Vokera technical for advice.
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 drain valve is in the open position whilst
re-charging takes place. Replace the dust cap and carry out
the relevant commissioning procedure (section 5).
25
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
No ignition
No hot water
No heating
Fault
Fault code
Possible cause
Check wiring/check electrical
supply
Check external controls
Check external controls
Possible cause
Check gas supply, check flue
system, check polarity
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 resistance 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 connectors 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 connections at the appliance terminal strip.
Repeat above test on the Live & Earth connections at the appliance terminal strip.
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 locating 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. 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 connections
at the appliance terminal strip. The meter should read approximately 230V ac. If so proceed to next stage. If not, see
7.7.4.
 connect test leads between the Neutral & Earth connections
at the appliance terminal strip. The meter should read approximately 0 – 15Vac. If so polarity is correct. If not, see
7.7.4.
7.7.4 REVERSED POLARITY OR SUPPLY FAULT
Repeat the above tests at the appliance isolator, if testing
reveals correct polarity and/or supply at the isolator, re-check
wiring and connections between the isolator and the appliance.
If tests on the isolator also reveal reversed polarity or a supply
fault, consult the local electricity supplier for advice.
7.7.5 RESISTANCE TO EARTH CHECK
Isolate the appliance from the electrical supply, and using a
suitable multi-meter carry out a resistance test. Connect test
leads between the Live & Earth connections at the appliance
terminal strip. If the meter reads other than infinity there is a
fault that must be isolated, carry out a detailed continuity check
to identify the location of the fault.
These series of checks must be carried out before attempting
any faultfinding procedures on the appliance. On completion
of any task that required the disconnection and re-connection
of any electrical wiring or component, these checks must be
repeated.
26
7.8 FAULT FINDING
Before attempting any faultfinding, the electrical checks as
detailed in 7.7 must be carried out. Isolate the appliance from
the electrical supply.
Disconnect any external controls from terminal plug (CN5 fig.
44), and insert a link-wire between the two wires at the ‘TA’
connections.
NOTE
Restore the electrical supply to the boiler and turn the selector
switch to the on position. The boiler should now function as
described in section 7. Should the boiler fail to respond, the
internal fuses and connectors should be checked to ensure
integrity and continuity.
7.9
COMPONENT VALUES & CHARACTERISTICS
COMPONENT
Fan
Pump
Ignition transformer
Gas valve
Room thermostat connection
Y and S plan input connection (CN1)
NTC thermistor (dry contact)
NTC thermistor (wet contact)
VALUE
230Vac
230Vac
230Vac
230Vac
24Vdc
230Vac
10Kohm
10Kohm
FUNCTION
Standard Heating temperature
range (min – max °C)
75% maximum CH time
Heating OFF hysterisis (°C)
Heating ON hysterisis (°C)
Anti-cycle delay
Pump over-run
Low output (min. output + %)
CO function max temp. (°C)
CO re-light temp. (°C)
CO function time
Flow NTC max temp. (°C)
High limit thermostat (°C)
Flue NTC max temp. (°C)
Maximum differential (°C)
VALUE
IGNITION CONTROL
Ignition attempts before L/O (lockout)
Re-ignition attempts after loss
of flame signal
VALUE
5
40 - 80
15 min
SP + 5
SP – 5
3-min
30-sec
Min+25
90
78
15-min
90
105
125
35
5
APPLIANCE STATUS LED AND FAULT CODES
When the boiler detects a temporary fault condition, the appropriate code is shown. If/when the fault is final, the pump
will perform a 60-second post circulation and fault code will be
displayed. See table on page. 5.
7.10 ADJUSTMENTS
The boiler has already been adjusted by the manufacturer
during production. If the adjustments need to be made again,
for example after extraordinary maintenance, replacement of
the gas valve, or conversion from methane gas to LPG, observe the following procedures.
The adjustment of the maximum and minimum output, and of
the maximum and minimum heating and of slow switch-on,
must be made strictly in the sequence indicated, and only by
qualified personnel only:
- disconnect the boiler from the power supply
- turn the heating water temperature selector to its maximum
- loosen the fixing screws (E) on the instrument panel
- lift then turn the instrument panel towards you
- loosen the fixing screws on the cover (F) to access the terminal board
- insert the jumpers JP1 and JP3
- power up the boiler
The display shows “ADJ” for approximately 4 seconds
Next change the following parameters:
1 - Domestic hot water/absolute maximum
2 - Minimum
3 - Heating maximum
4 - Soft light fan speed
as follows:
- turn the heating water temperature selector to set the required value
- press the CO button and then skip to the calibration of the
next parameter.
- Press the “combustion analysis” button a second time to
reach the number of rotations corresponding to the maximum domestic hot water output (table 1)
- Check the CO2 value: (table 4) if the value does not match
the value given in the table, use the gas valve maximum
adjustment screw
- Press the “combustion analysis” button a third time to reach
the number of rotations corresponding to the minimum output (table 2)
- Check the CO2 value: (table 5) if the value does not match
the value given in the table, use the gas valve minimum
adjustment screw
- To exit the “combustion analysis” function, turn the control
knob
- Remove the flue gas probe and refit the plug
- Close the instrument panel and refit the housing.
The “combustion analysis” function is automatically deactivated if the board triggers an alarm. In the event of a fault during
the combustion analysis cycle, carry out the reset procedure.
table 1
MAXIMUM NUMBER OF
FAN ROTATIONS
METHANE
GAS (G20)
LIQUID GAS
(G31)
Mynute i20
45
45
rpm
Mynute i30
52
50
rpm
Live electrical parts (230 V AC).
The following icons light up on the monitor:
1.
during domestic hot water/absolute maximum calibration
2.
during minimum calibration
3.
during heating maximum calibration
4. P
during soft light fan speed calibration
End the procedure by removing jumpers JP1 and JP3 to store
these set values in the memory.
THE function can be ended at any time without storing the
set values in the memory and retaining the original values as
follows:
- remove jumpers JP1 and JP3 before all 4 parameters have
been set
- set the function selector to
(OFF/RESET)
- cut the power supply
- waiting for 15 minutes after it is connected.
Calibration can be carried out without switch on the
boiler.
By turning the heating selection knob, the monitor automatically shows the number of rotations, expressed
in hundreds (e.g. 25 = 2,500 rpm).
GAS VALVE CALIBRATION
- Connect the boiler to the power supply
- Open the gas tap
- Set the function selector to
(OFF/RESET) (monitor off)
- Remove the screws (E), remove the casing, remove the retaining screw below the control fascia then lower the fascia
towards you (fig. 24)
- Loosen the fixing screws on the cover (F) to access the terminal board
- Press the CO button
table 2
MINIMUM NUMBER OF
FAN ROTATIONS
METHANE
GAS (G20)
LIQUID GAS
(G31)
Mynute i20
12
15
rpm
Mynute i30
12
15
rpm
SOFT LIGHT FAN
SPEED
METHANE
GAS (G20)
LIQUID GAS
(G31)
Mynute i20 - Mynute i30
33
33
Max. CO2
METHANE
GAS (G20)
LIQUID GAS
(G31)
Mynute i20 - Mynute i30
9.0
10.0
Min. CO2
METHANE
GAS (G20)
LIQUID GAS
(G31)
Mynute i20 - Mynute i30
9.0
10.0
table 3
rpm
table 4
%
table 5
%
Live electrical parts (230 V AC).
- Wait for burner ignition.
The display shows “ACO”. The boiler operates at maximum
heat output.
The “combustion analysis” function remains active for a limited time (15 min); if a delivery temperature of 90°C is reached,
the burner is switched off. It will be switched back on when
this temperature drops below 78°C.
- Insert the analyser probe in the ports provided in the air
distribution box, after removing the screws from the cover
27
The boiler is supplied with the adjustments shown in the table. Depending on plant engineering requirements or regional flue gas emission limits it is, however,
possible to modify this value, referring to the graphs below.
Mynute i30
Mynute i20
HTG curve (Qnheating)
6200
6000
5800
5600
5400
5200
5000
4800
4600
Fan rotations (rpm)
Fan rotations (rpm)
HTG curve (Qnheating)
6400
4400
4000
3600
3200
2800
2400
4200
3800
3400
3000
2600
2000
2200
1600
1800
1200
1400
1000
800
2
4
6
8
10
12
14
16
18
20
22
24
26
28
0
30
4
8
12
16
COs.a. curve (Qnheating)
24
28
32
36
40
COs.a. curve (Qnheating)
200
240
230
220
210
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
190
180
170
160
CO emissions s.a. (p.p.m.)
CO emissions s.a. (p.p.m.)
20
Heat output (kW)
Heat output (kW)
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
0
0
2
4
6
8
10
12
14
Heat output (kW)
7.10.1 CHECKING THE FAN SPEED
Locate the CO button (see Fig 40 pos SW1).
Select the main selector switch to the ON position, press the
CO button once, the display will then scroll through the fan
speeds along with the relevant icon.
16
18
20
22
24
26
30
32
34
36
38
40
REFERENCE
TEMPERATURE 20 °C
REFERENCE
TEMPERATURE 15 °C
7.10.2 THERMOREGULATION
To set the temperature regulation curve, locate potentiometer
(P3). By turning (P3), the curve is shown on the LCD display.
REFERENCE
TEMPERATURE 25 °C
ROOM TEMPERATURE CURVE OFFSET
90
DELIVERY TEMPERATURE (°C)
The user can adjust the temperature of the heating system
indirectly by changing the required room temperature from
between 15°C & 25°C, this will allow the PCB to recalculate
the system temperature required, the default temperature for
calculating the curve is 20°C.
The graph below can be used to determine the correct curve
setting.
28
Heat output (kW)
80
70
60
50
40
30
25 ° C
20 °C
20
15 °C
10
30
25
20
15
10
5
0
-5
EXTERNAL TEMPERATURE (°C)
28
-10
-15
-20
Fig. 42
CLIMATIC CURVES
3,0
FLOW OUTLET TEMPERATURE (°C)
100
2,5
2,0
1,5
90
T80
80
70
1,0
60
0,8
50
0,6
T45
0,4
40
0,2
30
20
20
15
10
5
0
-5
-10
-15
-20
EXTERNAL TEMPERATURE (°C)
T80 Maximum set point for standard T range (JP7 removed)
T45 Maximum set point for low T range (JP7 inserted)
CN5
1
CN15
CN15
CN6
JP7 INSERTED
CN12
JP7 JP6 JP5 JP4 JP3JP2 JP1
CN8
CN7
CN8
CN7
JP7 REMOVED
CN6
CN5
JP8
1
CN12
JP7 JP6 JP5 JP4 JP3JP2 JP1
JP8
P4
P4
SW1
SW1
CN13
CN13
P1
P1
CN14 P3
P2
CN14 P3
P2
Fig. 43
29
SECTION 8 - WIRING DIAGRAMS
8.1 EXTERNAL WIRING
External controls must to be added to the system and they
must be connected to the appliance as shown in the following
diagrams. For advice on controls that are not featured in this
book, please contact Vokera technical on 0844 3910999
8.1.1 EXTERNAL WIRING LIMITATIONS
Low voltage and High voltage cables must be run separately.
8.2 TYPICAL CONTROL APPLICATIONS
The appliance can be used with the following controls:
● twin-channel programmers.
The appliance can be used in conjunction with typical ‘S’-Plan
systems and ’Y’-Plan systems.
Please contact Vokera technical should you require further
detailed instruction.
8.3 OTHER DEVICES
Contact the controls manufacturer and/or Vokera technical
department should you require more specific information on
the suitability of a particular control. Further guidance on the
recommended practice for the installation of external controls,
can be found in CHeSS – HC5/HC6 (www.energyefficiency.
gov.uk).
BE11
NO NC C
CN1
CN2
BE11
NO NC C
CN1
CN2
Fig. 44
30
CN8
7
1
12
1
4
1
CN7
CN6
F.O.HT.
CN11
CN10
CN9
12
white
E.R.
-t°
CN15
FA2
CN11
1
-t°
R.S.
3.15A T
F1
CN14 P3
P4
arancione
-t°
F.T.
JP8
6
1
BE11
CN2
N
F
TSC2
1 2 3
CN1
2
3
4
pink
1 2 3 4 5
1
Spark
electrode
6
blue
brown
1
CN2
AKL Main PCB with vis medium integrated
BE11 On board relè PCB
P1
Selector switch and heating potentiometer
P2
Unused
P3
Unused
P4
Unused
JP1 Unused
JP2 Unused
JP3 Unused
JP4 Unused
JP5 Selection operating only heating
JP6 Unused
JP7 Unused
JP8 Closed - Unused
CN1-CN15 Connectors - (CN4 Unused – CN5 room thermostat (24 Vdc)
FA1
1
CN1
1
1
3
CN12
2
CN3
CN4
P2
1
CN2
JP7 JP6 JP5 JP4 JP3JP2 JP1
SW1
AKL
P1
F.S.
CN13
CN5
black
P
brown
brown
OPE OPE
brown
M3
230 V
N L
F
F Lv
blue
CN10 1
7
CN9
F Hv
2
1
2
1
3
W.P.S.
1
CN3
S.W. CO2 function button
F.S. (1)
Flame sensor
F1
Fuse 3.15A T
F
External fuse 3.15A F
M3
Terminal strip for electrical connection hight
power
P
Pump
OPE Gas valve solenoids
F Hv Fan power supply 230 V
F Lv Fan signal control
WPS Water pressure switch
S.E. Spark electrode
TSC2 Ignition transformer
F.O.H.T
Flow over heat thermostat
FS
Flue sensor
FT
Flow thermistor (NTC)
RS
Return thermistor (NTC)
4
Fuse 3.15A F
blue
GAS VALVE
blue
blue
blue
black
C NC NO
blue
blue
black
grey
grey
white
white
red
red
yellow/green
blue
brown
brown
red (+)
pink (PWM)
blue (HS)
grey (-)
brown
white
white
CN1
FUNCTIONAL DIAGRAM
Fig. 45
31
SECTION 10 - LPG INSTRUCTIONS
10.1 RELATED DOCUMENTS
BS 5440
BS 5449
BS 5482
BS 5546
BS 6798
PARTS 1 & 2
PART 1
PART 1
FLUES & VENTILATION REQUIREMENTS
FORCED CIRCULATION OF HOT WATER SYSTEMS
DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS
INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW
10.2 TECHNICAL DATA
Gas Pressures
Mynute i20
Mynute i30
37.0 mbar
37.0 mbar
Heating maximum gas rate (kg/hr)
1.55
2.33
Minimum gas rate (kg/hr)
0.31
0.39
Inlet pressure
Injector size
3.4 mm (flap side) - 3.25 mm (free side) 3.55 mm (flap side) - 3.55 mm (free side)
CO2 @ maximum output (%)
10.0
10.0
CO2 @ minimum output (%)
10.0
10.0
CO @ maximum output (ppm)
190
160
CO @ minimum output (ppm)
20
15
10.3 CONVERTING THE APPLIANCE GAS TYPE
To convert the appliance to another gas type it is necessary to
change the injector and adjust the gas valve (CO2).
 To change the injector see 6.12.1
 To adjust CO2 values see 10.6
10.4 GAS SUPPLY
The gas supply must be connected to the appliance by a competent LPG installer and must be of sufficient size to supply
the appliance at its maximum output. An existing supply must
be checked to ensure that it is of adequate size to deal with
the maximum rated input of this and any other appliances that
it serves.
10.5 GAS SUPPLY INSTALLATION
10.6 CHECKING THE CO2 AND ADJUSTING THE
GAS VALVE
THE GAS VALVE MUST BE SET-UP OR ADJUSTED WITH
THE AID OF A PROPERLY CALIBRATED FLUE GAS ANALYSER.
Isolate the appliance from the electrical supply and remove
the appliance casing as described in 4.7.1. Set the flue gas
analyser to read CO2 and insert the probe into the flue analysis
test point (fig. 40). Restore the electrical supply to the boiler
and switch the boiler to the OFF mode.
Have access to the printed circuit board, locate and open the
closing plug on the dash board (L2 fig. 43), locate and press
the CO button (see fig. 43 pos. SW1). The appliance will now
operate in CO2 mode for approximately 15-minutes.
The entire installation including the meter must be purged and
checked for gas tightness.
10.6.1 CO2 FUNCTION SETTINGS
Locate the CO button (see 7.3)
Select the main selector switch in position
CO2 FUNCTIONS
ACTION ON THE BUTTON
DISPLAY
combustion analysis mode
press once = burner running at maximum heating
ACO
gas valve maximun setting
press twice = burner running at maximum absolute
ACO
gas valve minimum setting
press three time = burner running at minimum
ACO
10.6.2 GAS VALVE MAXIMUM SETTING
Set the CO button at maximum (see 10.3.1), once the maximum
is obtained check that it corresponds with the appropriate CO2
value (Maximum) for the respective appliance. If the CO2 reading is correct, proceed to gas valve minimum setting (10.7.2).
However, if the CO2 reading is incorrect, the maximum gas
pressure must be adjusted as follows:
 using a 2.5mm Allen key, very slowly turn the maximum adjustment screw (see fig. 44) – clockwise to decrease, counter
clockwise to increase – until the correct value is displayed on
the CO2 analyser (allow time for the analyser to stabilise).
10.6.3 GAS VALVE MINIMUM SETTING
Set the CO button at minimum (see 10.3.1), once the minimum
is obtained check that it corresponds with the appropriate CO2
value (Minimum) for the respective appliance. If the CO2 reading is correct, proceed to completion (10.7.3).
However, if the CO2 reading is incorrect, the minimum gas
pressure must be adjusted as follows:
 locate the minimum adjustment screw (fig. 44), using a suitable screwdriver remove the protection plug
32
 using a 4mm Allen key, very slowly turn the minimum adjustment screw (see fig. 44) - clockwise to increase, counter
clockwise to decrease - until the correct value is displayed
on the CO2 analyser (allow time for the analyser to stabilise).
10.6.4 COMPLETION
On completion of the combustion analysis check and/or any
gas valve adjustment, refit the plug (L2 j) and move the mode
selector to the
position. Remove the test probe from the
test point and refit the sealing screw/s and/or cap.
IMPORTANT
A GAS TIGHTNESS CHECK MUST BE CARRIED OUT IF ANY
GAS CARRYING COMPONENTS HAVE BEEN REMOVED,
REPLACED OR DISTURBED.
ATTENTION
Gas type and appliance output must be set according to the
specific appliance specification. Vokèra accepts no responsibility if the gas type is not correctly adjusted according to the
respective appliance specification as detailed on the appliance
data badge.
Benchmark Commissioning and
Servicing Section
It is a requirement that the boiler is installed and commissioned to the
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www.centralheating.co.uk
© Heating and Hotwater Industry Council (HHIC)
33
GAS BOILER SYSTEM COMMISSIONING CHECKLIST
This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating
compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.
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SERVICE RECORD
It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed.
Service Provider
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35
COMMISSIONING: CO AND COMBUSTION RATIO CHECK
BEFORE CO AND COMBUSTION RATIO CHECK
The installation instructions should have been followed, gas
type verified and gas supply pressure/rate checked as required
prior to commissioning.
As part of the installation process, ESPECIALLY WHERE A
FLUE HAS BEEN FITTED BY PERSONS OTHER THAN THE
BOILER INSTALLER, visually check the integrity of the whole
flue system to confirm that all components are correctly
assembled, fixed and supported. Check that the maximum flue
lengths have not been exceeded and all guidance has been
followed (e.g. Technical Bulletin 008).
The flue gas analyser should be of the correct type, as specified
by BS 7967.
Before use, the flue gas analyser should have been maintained
and calibrated as specified by the manufacturer. The installer
must have the relevant competence for use of the analyser.
Check and zero the analyser IN FRESH AIR, as per analyser
manufacturer’s instructions.
NOTE
The air/gas ratio valve is factory-set and must not be
adjusted during commissioning unless this action is
recommended, following contact with the Vokera
technical help line. If any such adjustment is
recommended and further checking of the boiler is
required, the engineer must be competent to carry out
this work and to use the flue gas analyser accordingly.
If the boiler requires conversion to operate with a
different gas family (e.g., conversion from natural gas
to LPG) separate guidance will be provided by the
Vokera technical help line and must be followed.
SET BOILER TO MAXIMUM RATE
In accordance with, section 7.3, set boiler to operate at maximum rate (full load condition). Allow sufficient time for combustion to
stabilise. , insert analyser probe into air inlet sampling point.
Verify flue integrity
Analyser readings indicate
that combustion products
and inlet air are mixing.
Further investigation of the
flue is therefore required.
Check that flue components
are correctly assembled,
fixed and supported as per
boiler/flue instructions.
Check that flue and flue
terminal are not obstructed.
Turn off appliance and call
Vokera’s technical helpline
for advice.
The appliance must not be
commissioned until
problems are identified and
resolved. If commissioning
cannot be fully completed,
the appliance must be
disconnected from the gas
supply in accordance with
the GSIUR.
NOTE: Check and record CO and
combustion ratio at both
maximum AND minimum rate
before contacting the Vokera
NO
Is O2 ш20.6%
and CO2 < 0.2%?
Is O2 ш20.6%
and CO2 < 0.2%?
CHECK CO AND
COMBUSTION RATIO
AT MAXIMUM RATE
YES
With boiler still set at
maximum rate, insert
analyser probe into flue
gas sampling point.
Allow readings to
stabilise before
di
YES
NO
Turn off appliance and
call Vokera’s technical
helpline for advice.
The appliance must not
be commissioned until
problems are identified
and resolved.
NO
NO
Is CO less
than 350ppm
AND
CO/CO2 ratio
less than
0.004?
YES
Check all seals
around the appliance
burner, internal flue
seals, door and case
seals. Rectify where
necessary.
NO
Is CO less than
350ppm AND
CO/CO2 ratio less
than 0.004?
YES
Is CO < 350ppm
and CO/CO 2 ratio
less than 0.004 ?
YES
CHECK CO AND COMBUSTION
RATIO AT MINIMUM RATE
With boiler set at minimum rate,
insert analyser probe into flue
gas sampling point. Allow
readings to stabilise before
recording.
SET BOILER TO
MINIMUM RATE
In accordance with
section 7.3, set
boiler to operate at
minimum rate (to
minimum load
condition). Allow
sufficient time for
combustion to
stabilise.
Boiler is operating satisfactorily
No further actions required.
Ensure test points are capped, boiler case is correctly replaced and all other commissioning procedures are completed.
Complete Benchmark Checklist, recording CO and combustion ratio readings as required.
36
39
Cod. 20073574 - 11/13 - Ed. 1
Registered address:
Vokèra Ltd
Borderlake House
Unit 7 Riverside Industrial Estate
London Colney
Herts AL2 1HG
enquiries@vokera.co.uk
www.vokera.co.uk
www.vokera.ie
Sales, General Enquires
T 0844 391 0999
F 0844 391 0998
Vokèra Ireland
West Court, Callan
Co Kilkenny
T 056 7755057
F 056 7755060
Vokèra Limited reserve the right to change
specification without prior notice
Consumers statutory rights are not affected.
A Riello Group Company.
Company Reg No: 1047779
38