VOKERA Pinnacle User guide

Installation
& Servicing
Instructions
THESE INSTRUCTIONS
TO BE RETAINED
BY USER

Contents
Design principles & operating sequence Page
1.1 Principle components 2
1.2 Mode of operation (at rest) 2
1.3 Mode of operation (heating or hot water request) 2
1.4 Safety devices 2
Technical data Page
2.1 Central heating 3
2.2 Gas pressure 3
2.3 Expansion vessel 3
2.4 Dimensions 3
2.5 Clearances 3
2.6 Connections 3
2.7 Electrical 3
2.8 Flue details 3
2.9 Efficiency 3
2.10 Adjusting operating parameters 3
2.11 Emissions 3
2.12 Pump duty 4
General requirements (UK) Page
3.1 Related documents 5
3.2 Location of appliance 5
3.3 Gas supply 5
3.4 Flue system 5
3.5 Air supply 5
3.6 Water circulation 5
3.7 Electrical supply 6
3.8 Mounting on a combustible surface 6
3.9 Timber framed buildings 6
3.10 Condensate disposal 6
3.11 Inhibitors 6
General requirements (EIRE) Page
3A.1 Related documents 8
3A.2 Location of appliance 8
3A.3 Gas supply 8
3A.4 Flue system 8
3A.5 Air supply 8
3A.6 Water circulation 8
3A.7 Electrical supply 9
3A.8 Mounting on a combustible surface 9
3A.9 Timber framed buildings 9
3A.10 Condensate disposal 9
3A.11 Inhibitors 9
3A.12 Declaration of conformity 9
Installation Page
4.1 Delivery 10
4.2 Contents 10
4.3 Unpacking 10
4.4 Preparation for mounting the appliance 10
4.5 Fitting the flue 10
4.6 Connecting the gas & water 13
4.7 Condensate outlet 13
4.8 Automatic air release valve 14
4.9 Electrical connections 14
4.10 Casing removal 15
Commissioning Page
5.1 Gas supply installation 16
5.2 The heating system 16
5.3 Initial filling of the system 16
5.4 Initial flushing of the system 16
5.5 Pre-operation checks 16
5.6 Initial lighting 16
5.7 Final flushing of the heating system 16
5.8 Inhibitors 16
5.9 Appliance operating parameters 16
5.10 Parameters 3 & 4 16
5.11 Information mode 16
5.12 Setting the system design pressure 17
5.13 Regulating the central heating system 17
5.14 Checking dynamic gas pressure 17
5.15 Final checks 17
5.16 Instructing the user 17
Servicing Page
6.1 General 18
6.2 Routine annual servicing 18
6.3 Replacement of components 18
6.4 Component removal procedure 18
6.5 Pump head 18
6.6 Safety valve 18
6.7 Automatic air release valve 18
6.8 Pressure gauge 18
6.9 NTC thermistors (temperature sensors) 19
6.10 Printed circuit board (PCB) 19
6.11 Gas valve 19
6.12 Fan 19
6.13 Burner 19
6.14 Electrode 20
6.15 Injector 20
6.16 Automatic by-pass assembly 20
6.17 Condense trap 20
6.18 Condense pressure switch 20
6.19 Combustion cover 20
6.20 Expansion vessel 21
6.21 Input & status PCB 21
Checks, adjustments and fault finding Page
7.1 Checking appliance operation 22
7.2 Appliance mode of operation 22
7.3 Service paameters (5-42) 22
7.4 Adjusting the gas valve 22
7.5 1st digit status code 24
7.6 Temporary fault codes 24
7.7 Final fault codes 24
7.8 Diagnostic recall 24
7.9 Checking the expansion vessel 24
7.10 External faults (installation) 25
7.11 Electrical checks 25
7.12 Fault finding 25
Wiring diagrams Page
8.1 Installation of Vokera time clock 31
8.2 External controls important 31
Exploded diagrams Page
9.1 Table 1 36
9.2 Table 2 37
9.3 Table 3 38
9.4 Table 4 39
9.5 Table 5 40
L.P.G. instructions Page
10.1 Technical data 41
10.2 Related documents 41
10.3 Gas supply 41
10.4 Gas supply installation 41
10.5 Adjusting the gas valve 41

1
INTRODUCTION
General layout (fig. 1A)
1 Auto by-pass
2 Safety valve
3 Condense trap
4 Pump
5 Return sensor (NTC2)
6 Gas valve
7 Silicone pressure tube
8 Flow sensor (NTC1)
9 Auto air vent (AAV)
10 Flue outlet & air intake
11 Flue gas analysis test point
12 Burner plate
13 Expansion vessel
14 Spark/Sensing Electrode
15 Heat exchanger
16 Pressure switch
17 Fan assembly
18 Electronic Control Board (PCB)
R Heating return connection
F Heating flow connection
G Gas connection
The Pinnacle range of boilers are central heating
condensing boiler, which – by design – incorporates full
sequenceelectronic ignition,circulating pump,expansion
vessel, safety valve, pressure gauge and automatic by-
pass.
Pinnacleisproducedasaroomsealed,categoryC1,C3,
C6 appliance, suitable for wall mounting applications
only. Pinnacle is provided with a fan powered flue outlet
withanannularco-axialcombustionairintakethatcanbe
rotated – horizontally – through 360 degrees for various
horizontal or vertical applications. Pinnacle can also be
used with the Vokera twin flue system.
This appliance is designed primarily for use with sealed
systems;however itcan alsobe usedonanopenvented
system, provided that the necessary installation
requirements are met.
Fig. 1B
1
2
3
4
5
6
7
8
9
10
3
4
5
2
1
6
7
11
13
14
15
16
17
18
10
12
8
9
RF G
Control board (fig. 1B)
1 STEP button
2 PLUS button
3 MODE button
4 4 digits display
5 Status LED
6 RESET button
7 MINUS button
8 CH button/MEMO button
9 Time clock aperture
10 Pressure gauge
Fig. 1A

2
SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE
1.1 PRINCIPLE COMPONENTS
●A fully integrated electronic control board
featuring differential temperature control,
continuous air/gas modulation, anti-cycle
control, pump over-run, self-diagnostic fault
indicator, electronic ignition with flame
supervision & appliance frost protection
●Cast aluminium mono-block heat exchanger
●Low Nox burner with pre-mix
●Two-stage gas valve
●Pump
●Expansion vessel
●Pressure gauge
●Safety valve
1.2 MODE OF OPERATION (at rest)
Whenthereisnodemandforheatingorhotwater
andtheapplianceremainsinactiveforaperiodof
24 hours, the pump will be energised for a few
moments to prevent it from seizing. Should the
flowtemperaturesensorfallbelow7ºCthepump
will be energised. If the flow sensor temperature
falls to below 3 ºC the burner will be lit and the
appliancewilloperateattheminimumoutputuntil
thetemperatureoftheflowsensorreaches10ºC,
whereuponthepumpwillcontinuetoruninpump
over-run mode.
1.3 MODE OF OPERATON (heating or hot water
request)
Whenthereisarequestforheatviathetimeclock
and/or external controls, the pump will start and
the fan will be activated via the flow temperature
sensor. When the fan is sensed to be operating
correctly,theignitionsequencecommences.The
speed of the fan and therefore the output of the
boiler is determined by the temperature of the
water sensed by the flow & return temperature
sensors,consequentlya high temperatureat the
flow sensor results in a lower fan speed. As the
water temperature increases, the temperature
sensors – located on the flow and return pipes of
theboiler–reducethefanspeedviatheelectronic
circuitry.Depending ontheload, eitherthe water
temperaturewillcontinuetoriseuntilthesetpoint
is achieved or the water temperature will fall
whereby fan speed will increase relative to the
outputrequired.Whentheboilerhasreachedthe
set point, the burner will switch off. The built-in
anti-cycle device prevents the burner from re-
lighting for an adjustable period of time (factory
default is 3 minutes). When the temperature of
the flow sensor falls below the set-point, the
burner will re-light.
1.4 SAFETY DEVICES
When the appliance is in use, safe operation is
ensured by:
●a high limit thermostat that interrupts the
operation of the burner;
●adifferentialtemperatureprotectioncircuitwhich
interrupts the burner if the temperature
differential is inverted;
●a fan speed sensor that checks the correct
operation of the fan, thereby allowing safe
operation of the burner;
●a condense pressure switch that will stop the
burner from operating should the condense
trap become blocked;
●asafetyvalve whichreleases excess pressure
from the primary circuit.
Fig. 2
return flowgas
1
Heat
exchanger
Expansion
vessel
4
NTC1
(flow
sensor)
NTC2
(return
sensor)

3
SECTION 2 TECHNICAL DATA
Ref. Condition 15 °C, 1013,25 mbar, dry gas
NOTE: L.P.G. data refer to section 10
2.1 Central heating 16 26
Heat input (gross) 17.8 kW 29 kW
Maximum heat output 60/80°C (return & flow temperature) 15.4 kW 25.3 kW
Maximum heat output 30/50°C (return & flow temperature) 16.8 kW 26.8 kW
Minimum heat output 60/80°C (return & flow temperature) 4.4 kW 7.3 kW
Minimum heat output 30/50°C (return & flow temperature) 4.9 kW 8.1 kW
Minimum working pressure 0.5 bar 0.5 bar
Maximum working pressure 3 bar 3 bar
Minimum flow rate 350 litres per hour 350 litres per hour
2.2 Gas pressure
Inlet pressure (G20) 20.0 mbar 20.0 mbar
Maximum gas rate 1.69 m3/h 2.76 m3/h
Minimum gas rate 0.49 m3/h 0.80 m3/h
Injector size single injector with six 3.1 mm holes single injector with six 3.8 mm holes
2.3 Expansion vessel
Capacity 10 litres 10 litres
Maximum system volume 91 litres (approx.) 91 litres (approx.)
Pre-charge pressure 1.0 bar 1.0 bar
2.4 Dimensions
Height 820 mm 820 mm
Width 450 mm 450 mm
Depth 355 mm 355 mm
Dry weight 53 kg 53 kg
2.5 Clearances
Sides 12 mm 12 mm
Top 150 mm from casing or 25 mm above flue elbow (whichever is applicable)
Bottom 150 mm 150 mm
Front 600 mm 600 mm
2.6 Connections
Flow & return 22 mm compression 22 mm compression
Gas 15 mm compression 15 mm compression
Safety valve 15 mm compression 15 mm compression
2.7 Electrical
Voltage 230V/~ 50hz 230V/~ 50hz
Power consumption 130 W 130 W
Internal fuse F2A F2A
External fuse 3A 3A
2.8 Flue details
Maximum horizontal flue length (concentric) 10.0 metres 6.45metres
Maximum vertical flue length (concentric) 11.0 metres 7.45 metres
Maximum twin flue length (horizontal or vertical) 39 m/39 m + terminal 29 m/29 m + terminal
2.9 Efficiency
SEDBUK rating 90.3% (Band “A”) 90.3% (Band “A”)
2.10 Adjustable operating parameters
PARAMETER MINIMUM MAXIMUM FACTORY SETTING
P. 4 Central heating flow temperature 20 °C 90 °C 75 °C
P. 20 Pump over-run 10 seconds 99 m 10 m
P. 28 Anti-cycle delay 0 seconds 306 seconds 91.8 seconds
2.11 Emissions 16 26
NOxMin. output 20 ppm 15 ppm
NOxMax. output 40 ppm 30 ppm
CO Min. output 50 ppm 50 ppm
CO Max. output 50 ppm 50 ppm
CO2Min. output 9.8% 9.8%
CO2Max. output 9.8% 9.8%
CO/CO2ratio 0.0005 to 1 0.0005 to 1

4
2.12 PUMP DUTY
Fig.3showstheflowrateavailable–afterallowing
for pressure loss through the appliance – for
system requirements. When using this graph
apply only the pressure loss of the system. The
graphis basedon 20ºCtemperaturedifferential.
Fig. 4
Fig. 3
Water pressure (mH20)
Litres Per Hour
SECTION 3 GENERAL REQUIREMENTS (UK)
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6
6,5
7
0 100 200 300 400 500 600 700 800 900 1000 1100 120
0
()
Key Location Minimum distance
A Below an opening (window, air-brik, etc.) 300 mm
B Above an opening (window, air-brik, etc.) 300 mm
C To the side of an opening (window, air-brik, etc.) 300 mm
D Below gutter, drain-pipe, etc. 75 mm
E Below eaves 200 mm
F Below balcony, car-port roof, etc. 200 mm
G To the side of a soil/drain-pipe, etc. 150 mm
H From internal/external corner or boundary 300 mm
I Above ground, roof, or balcony level 300 mm
J From a surface or boundary facing the terminal 600 mm
K From a terminal facing a terminal 1200 mm
L From an opening in the car-port into the building 1200 mm
M Vertically from a terminal on the same wall 1500 mm
N Horizontally from a terminal on the same wall 300 mm
P From a structure to the side of the vertical terminal 300 mm
Q From the top of the vertical terminal to the roof flashing As determined by the fixed collar
of the vertical terminal

5
This appliance must be installed by a competent
personinaccordancewiththeGasSafety(Instal-
lation & Use) Regulations.
3.1 RELATED DOCUMENTS
The installation of this boiler must be in accord-
ance 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.
Itshouldbe inaccordance alsowithany relevant
requirementsofthelocalauthorityandtherelevant
recommendationsofthefollowingBritishStandard
Codes of Practice.
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.
wiringregulations,and in Scotland,the electrical
provisions of the Building Regulations, with
respect to the installation of the appliance in a
roomorinternalspacecontainingabathorshower.
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.
Thelocationchosenfortheappliancemustpermit
the provision 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, BS 6798 gives detailed guidance on
this aspect.
A compartment used to enclose the appliance
must be designed and constructed specifically
for this purpose. An existing compartment/cup-
board may be utilised provided that it is modified
to suit.
Details of essential features of compartment/
cupboard design, including airing cupboard in-
stallations, are given in BS 6798. This appliance
is not suitable for external installation.
3.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier
–mustbecheckedtoensurethatitisofadequate
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 soundness in
accordance with BS 6891.
Ifthegassupplyservesmorethanoneappliance,
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
Theterminalshouldbelocatedwherethedisper-
sal of combustion products is not impeded and
withdueregardforthedamageanddiscoloration
thatmayoccurtobuildingproductslocatednearby.
Theterminalmustnotbelocatedinaplacewhere
it is likely to cause a nuisance (fig. 4).
In a cold and/or humid water, water vapour may
condense on leaving the terminal; the effect of
such pluming must be considered.
If installed less than 2 metres above a pavement
orplatformtowhichpeoplehaveaccess(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.
Referto BS5440Part 1,when theterminalis 0,5
metres(orless)belowplasticguttering or1metre
(or less) below painted eaves.
3.5 AIR SUPPLY
The following notes are intended for general
guidance only.
Thisappliance isaroom sealed,fan-flued boiler,
consequentlyitdoes not requireapermanent 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
Detailedrecommendations aregiven inBS 5449
Part 1 and BS 6798. The following notes are for
general guidance only.
BS 5440 PART 1 FLUES
BS 5440 PART 2 FLUES & VENTILATION
BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS
BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW
BS 6891 LOW PRESSURE INSTALLATION PIPES
BS 7074 PART 1 APPLICATION, SELECTION AND INSTALLATION OF EXPANSION VESSELS AND
ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS

6
Fig. 5A
3.6.1 PIPEWORK
ItisrecommendedthatcoppertubingtoBS2871Part
1isused in conjunction withsoldered capillary joints.
Where possible pipes should have a gradient to
ensureairiscarriednaturallytoairreleasepoints
and that water flows naturally to drain cocks.
Exceptwhereprovidingusefulheat,pipesshould
beinsulatedtoavoidheatlossandinparticularto
avoid the possibility of freezing. Particular atten-
tion should be paid to pipes passing through
ventilated areas such as under floors, loft-space
and void areas.
3.6.2 AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass,
consequently there is no requirement for an ex-
ternalby-pass,howeverthedesignofthesystem
should be such that it prevents boiler ‘cycling’.
3.6.3 DRAIN COCKS
These must be located in accessible positions to
facilitatedraining oftheappliance andall waterpipes
connectedtotheappliance.Thedraincocksmustbe
manufactured in accordance with BS 2879.
3.6.4 AIR RELEASE POINTS
Thesemustbepositionedatthehighestpointsin
thesystem whereair islikelytobetrapped. They
should be used to expel trapped air and allow
complete filling of the system.
3.6.5 EXPANSION VESSEL
Theappliancehasanintegral expansionvesselto
accommodatetheincreasedvolumeofwaterwhen
thesystemisheated.Itcanacceptupto10litresof
expansionfromwithinthesystem,generally thisis
sufficient, however if the system has an unusually
highwatercontent,itmaybe necessarytoprovide
additional expansion capacity.
3.6.6 FILLING POINT (fig. 5)
A method for initial filling of the system and
replacing water lost during servicing etc. has
beenprovided.Thismethodoffillingmustcomply
with the current Water Supply (Water Fittings)
Regulations 1999 and Water Bylaws 2000
(Scotland).Fig.5showsawidelyacceptedmethod.
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 (fig. 5A). The cold feed from the
make-up vessel or tank must be fitted with an
approved non-return valve and stopcock for iso-
lation purposes. The feed pipe should be con-
nected 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 withstand-
ing 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
completeisolationfromthesupply.Thepreferred
method is by using a double-pole switch with a
contact separation of at least 3 mm. The switch
must only supply the appliance and its
correspondingcontrols,i.e.timeclock,roomther-
mostat,etc.Alternativelyanun-switchedshuttered
socket with a fused 3-pin plug both complying
with BS 1363 is acceptable.
3.8 MOUNTING ON A COMBUSTIBLE SURFACE
Iftheapplianceistobefittedonawallofcombus-
tible material, a sheet of fireproof material must
protect the wall.
3.9 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed
building,itshouldbefittedinaccordancewiththe
Institute of Gas Engineers publication (IGE/UP/
7)“Guidefor Gas Installations inaTimber Frame
Buildings”.
3.10 CONDENSATE DISPOSAL
When choosing a location for the boiler,
consideration should be given to the disposal of
thecondensatedischargeintoa suitabledrainor
soil pipe. The condensate outlet pipe must be
connectedtothedraininaccordancewithbuilding
regulations or other rules in force.
3.11 INHIBITORS
Vokera recommend that a inhibitor – suitable for
usewithaluminium heatexchangers –isused 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.
Make-up vessel
or tank
Automatic
air-vent
Non-return
valve Stopcock
5.0 metres minimum
Heating
return
Fig. 5
control valve
temporary
connection control valve
flow/return
pipe double check
valve supply pipe

7
*Fernox and Sentinel manufacture products that
have proved suitable for use with Vokera
appliances. Vokera Ltd. cannot comment on the
suitability of any other such product with our
appliances.
Fig. 6
CH return
valve
CH flow
valve
Gas cock
Fig. 6A
CONDENSATE
TRAP
RETURN FLOW GAS

8
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
Theinstallationofthisboilermustbeinaccordance
withtherelevantrequirementsofthelocalbuilding
regulations, the current ETCI National Rules for
Electrical Installations, and the bylaws of the
local water undertaking.
Itshouldbe inaccordance alsowithany relevant
requirementsofthelocaland/ordistrictauthority.
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
NationalRules forElectrical 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.
Thelocationchosenfortheappliancemustpermit
the provision 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 designed 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
–mustbecheckedtoensurethatitisofadequate
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
soundness in accordance with I.S. 813.
Ifthe gassupply servesmorethanoneappliance,
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
Theterminalshouldbelocatedwherethedispersal
of combustion products is not impeded and with
dueregardforthedamageanddiscolorationthat
may occur to building products located nearby.
Theterminalmustnotbelocatedinaplacewhere
it is likely to cause a nuisance (see I.S. 813).
In cold and/or humid weather, water vapour may
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.
RefertoI.S.813,when theterminalis0.5metres
(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.
Thisapplianceisaroom-sealed,fan-fluedboiler,
consequentlyitdoes not requireapermanent 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
ensureairiscarriednaturallytoairreleasepoints
and that water flows naturally to drain cocks.
Exceptwhereprovidingusefulheat,pipesshould
beinsulatedtoavoidheatlossandinparticularto
avoidthepossibilityoffreezing.Particularattention
shouldbepaidtopipespassingthroughventilated
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
Thesemustbe located inaccessiblepositions to
facilitate draining of the appliance and all water
pipes connected to the appliance.
SECTION 3A GENERAL REQUIREMENTS (EIRE)