Potterton NXR3 User manual

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NXR3
Installation, Operation and Maintenance Manual
To be kept by the user October 2010
heating specialists

INDEX
Section 1 Page
Fig. 1 - General Data & Dimensions 1
Table 1 - Boiler Dimensions 1
Table 2 - Combustion Chamber Data 1
Table 3 - Technical Data 2
- Explanatory Notes 3
- Clearances 4
Fig. 2 - Boiler Clearances 4
Fig. 3 - Boiler Footprint/Base Details 4
Section 2
- General Information 5
- Standard Supply 5
- Controls 5
- Optional Extras 5
- Shipping / Packaging 5
- Installation Standards 6
- Boiler Siting & Base 6
Section 3
- Ventilation 7
- Flues (General) 7
- Water Circulation Systems 7
- Boiler Protection 8
- System Water Quality 8
Section 4
- Boiler Erection 9
- Risk Assessment 9
- Manual Handling 9
- Personal Protective Equipment 9
- Confined Spaces 9
- Electrical Safety 9
- Packaging Details 9
- Preparation 9
- C.O.S.H.H 10
- Erection Checklist 10
- Boiler Erection 11
Fig. 4 - Section Assembly 11
Fig. 5 - Section Orientation 12
- Pulling Up Bars 12
Fig. 6 - Boiler Fittings Assembly 13
- Fittings Assembly 14
Fig. 7 - Baffles Assembly 14
Fig. 8 - Door Hinge Guide Assembly 14
- Insulation & Casing Assembly 15
Fig. 9 - Insulation Position 15
Fig. 10 - Casing Support Frame 15
- Casing Assembly 16
Fig. 11 - Casing Side Panel Assembly 16
Fig. 12 - Front Casing Assembly 16
Fig. 13 - Casing Assembly 17
Fig. 14 - Control Panel Configuration 18
Fig. 15 - Control Panel Operation 18
Fig. 16 - Cable/Capillary Tube Routing 20
Page
Fig. 17 - Fitting Thermometer into Flue 20
- Fitting the Burner 20
- Connections 21
- Single Phase Installation 21
Fig. 18 - Boiler & Burner Power Supply 21
Fig. 18A - Boiler & Burner Single Phase
Supply 21
- Three Phase Installation 21
- Volt Free Contacts 21
- Connecting the Gas Supply 21
- Connecting the Oil Supply 22
- Connecting the Water System 22
Section 5
- Commissioning Check List 23
- Contravention of Regulations 23
- Boiler Commissioning 23
- Safety Requirements 24
- Emergency Instructions 24
- Pre-Commissioning Dry Run 24
- Soundness Testing 24
- Commissioning Live Run 24
- Additional Checks 25
- Fault Finding 25
- Overheat Operation 25
- Burner Lockout 25
- Boiler Maintenance 26
- Cleaning Flue Surfaces 26
- Natural Gas/LPG Fired Boilers 26
- Class ‘D’ & ‘C2’ Fired Boilers 26
- Sludge Gas 26
- Boiler Ancillaries 26
- Boiler Controls 26
- Safety Interlocks 26
Section 6
Fig. 19 - Boiler Wiring Diagram 27
- Wiring Diagram – Legend 28
Fig. 20 - Pump Overrun Pipe Thermostat 28
Section 7
- NXR3 Boiler Parts List 29
Fig. 21 - Boiler Components 30
Fig. 22 - Casing Components 32
Fig. 23 - Instrument Panel Components 34

POTTERTON COMMERCIAL PRODUCTS DIVISION SECTION 1
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR3 PAGE 1
Fig. 1 – General Data and Dimensions
Table 1 – Boiler Dimensions
NXR3 Model 34 35 36 37 38 39
A mm 995 1165 1335 1505 1675 1845
B mm 900 1070 1240 1410 1580 1750
∅D mm 180 200
Water Connections F&R 2½” BSP Screwed Flanges (PN6)
Table 2 – Combustion Chamber Data
Model 34 35 36 37 38 39
Mean Diameter mm 474
Cross Sectional Area m
2
0.176
Length (X) mm 625 795 965 1135 1305 1475
Volume m
3
0.11 0.14 0.17 0.2 0.23 0.26
Surface Area m
2
1.11 1.36 1.61 1.87 2.12 2.37
Resistance mbar 0.25 0.54 0.95 1.32 2 2.52
Flue Gas Temperature (Gross) °C 170 160
Percentage CO
2
OIL % 13
GAS % 9.5
Flow
1010
Drain 1 1/2" BSP Return
110
815
450 402
X
DØ
B
A
145
75
520
606
1180
1396
800
Clean
out Hole
2" BSP (FRONT VIEW) (SIDE VIEW) (REAR VIEW)
Flow
1010
Drain 1 1/2" BSP Return
110
815
450 402
X
DØ
B
A
145
75
520
606
1180
1396
800
Clean
out Hole
2" BSP (FRONT VIEW) (SIDE VIEW) (REAR VIEW)

SECTION 1 POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
PAGE 2 NXR3
Table 3 – Technical Data
Model NXR 34 35 36 37 38 39
Number of Sections 4 5 6 7 8 9
CE Number 0085AQ0751
Output kW 90 130 170 210 250 290
1 Fuel Consumption GAS m
3
/hr 10.04 14.5 18.95 23.51 28.06 32.62
OIL Lit/hr 9.97 14.39 18.8 23.33 27.84 32.37
Input (Gross) GAS
OIL kW 107.7 155.5 203.2 252.1 300.9 349.8
Input (Net) GAS
OIL kW 97 140 183 227 271 315
Maximum Design Pressure Bar 6 BAR – ALL MODELS
2 Minimum Operating Pressure Bar 1 BAR – ALL MODELS
3 Nominal Flue Connection Size mm 180 mm Ø 200mm Ø
4 Flue Gas Volume GAS m
3
/hr
OIL m
3
/hr 126 182 237 294 351 409
Flue Draught Requirements 0-4 mm.w.g. – ALL MODELS
5 High Level Natural Ventilation to BS 6644 cm
2
194 280 366 454 542 630
5 Low Level Natural Ventilation to BS 6644 cm
2
388 560 732 908 1084 1260
6 Mechanical Inlet to BS 6644 m
3
/sec 0.075 0.108 0.142 0.176 0.210 0.245
7 Water Connection Size (Flow & Return) 2 ½” BSP Screwed Flanges – ALL MODELS
8 Water Flow at 11°C ∆t lit/sec 1.95 2.81 3.68 4.55 5.41 6.28
Min water flow at 20°C ∆t lit/sec 1.07 1.55 2.02 2.5 2.98 3.45
8 Hydraulic resistance at 11°C ∆t kPa 0.9 1.7 2.8 3.9 5.8 9.3
9 Cold feed size to BS 6644 Minimum Bore mm 25 32
9 Open Vent size to BS 6644 Minimum Bore mm 32 40
9 Safety Valve Size to BS 6644 Nominal Bore mm 19 25
Maximum Flow Temperature °C 90°C – ALL MODELS
10 Minimum Return Temperature (Direct
Compensation) °C 55°C – ALL MODELS
Limit Thermostat Setting °C 110°C – ALL MODELS
11 Dry Weight Kg 612 730 848 966 1068 1184
Water Content kg 112 136 160 184 208 232
Power Requirements (Boiler Control Circuit) 230V 1Ph 50Hz, Fused 6.3A – ALL MODELS
12 Natural Gas Supply Pressure Max
Min 25 mbar 17.0 mbar
35 Second Oil Supply Pressure Max
Min 0.69 mbar 0 bar
See page 3 for explanatory notes Conversion table on inside back cover.

POTTERTON COMMERCIAL PRODUCTS DIVISION SECTION 1
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR3 PAGE 3
1. FUEL CONSUMPTION
Gas fuel consumption is based on natural gas with a gross calorific value of 38.6 MJ/m
3
. The gas rate
should be corrected for the meter supply pressure particularly on high pressure supplies to prevent
overfiring.
Fuel oil consumption is based on Class D (35 second) gas oil with a calorific value of 58.24 MJ/lit and a
density of 0.855 kg/lit, Kerosene (Class C2) has a calorific value of 53.22 MJ/lit and a density of 0.795
kg/lit.
2. MINIMUM OPERATING PRESSURE
This is the minimum operating pressure of the boilers with pumps operating (NOT static pressure). The
requirements of the Health & Safety Executive guidance note PM5 regarding maximum operating
temperatures should be observed.
3. BOILER FLUE CONNECTION
This is the nominal flue size of the flue connection spigot, for dimensional details of the flue connection
spigot see Fig. 1. Actual flue size required to achieve correct draught and operation under all running
conditions may need to be increased.
4. FLUE GAS VOLUME
Flue gas volumes are given at STP (standard temperature and pressure [15°C and 1013.25 mbar]).
Typical flue gas temperatures are given in Table 2.
5. NATURAL VENTILATION
The sizes indicated are free grille areas and are based on a single boiler installation.
6. MECHANICAL VENTILATION
The volume given is for a single boiler installation.
7. CONNECTION SIZES
The boiler water connections are 2 ½” BSP screwed flange PN6. Also supplied 2 ½” welded flanges.
8. WATER FLOW RATES
Water flow rates are given for boiler flow and return water temperature differences of 11°C.
9. COLD FEED/ OPEN VENT/ SAFETY VALVE SIZES
Sizes indicated are minimum sizes for single boiler installations.
10. MINIMUM RETURN TEMPERATURE
If system return temperatures below 55°C are required the contact the Potterton Commercial Technical
Department.
11. WEIGHT
The dry weight is exclusive of the burner and gas train. Each section measures approximately 1100mm
(high) ×606mm (wide) ×180mm (deep) and weighs 106kg (inter), 110kg (front), 125kg (rear).
ANY PERSON OR PERSONS MOVING OR LIFTING SHOULD BE TRAINED IN MANUAL HANDLING
TECHNIQUES AND IF NECESSARY USE SUITABLE LIFTING EQUIPMENT TO REDUCE THE RISK OF
INJURY TO THEMSELVES OR OTHER PEOPLE.
12. Some burners may require higher than 17.0 mbar inlet pressure, please see relevant burner card for details,
or contact the Commercial Technical Office.

SECTION 1 POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
PAGE 4 NXR3
CLEARANCES
The minimum boiler room clearances for access, erection and maintenance are given in Fig. 2 and Fig. 3, the
dimensions are minimum values. There is no minimum clearance above the boiler, however, it is recommended
that clearance is left above the top of the instrument panel to facilitate its removal. At the front of the boiler allow as
a minimum the A dimension, this is to allow access to the combustion chamber for maintenance and servicing. For
P dimension please refer to relevant burner card.
Fig. 2 – Boiler Clearances
Minimum Clearance(Front)
Nu-Way Oil Nu-Way Gas Riello Oil Riello gas EOGB Oil EOGB Gas
Model A (mm) A (mm) A (mm) A (mm) A (mm) A (mm)
34 900 900 900 900 900 972
35 1070 1070 1070 1070 1070 1070
36 1240 1240 1240 1240 1240 1240
37 1410 1410 1410 1410 1410 1410
38 1580 1580 1580 1580 1580 1580
39 1750 1750 1750 1750 1750 1750
Fig. 3 – Boiler Footprint/Base Details
Flat Plate – 6 mm thick
(Not supplied by Potterton)
Boiler Size
C
L
34
750
900
35
920
1070
36
1090
1240
37
1260
1410
38
1430
1580
39
1600
1750
No special plinth is required for
this boiler, a simple dry base is
sufficient. Boiler footprint and
base clearance details are given
in Fig. 3.
Provision must be made to allow
free movement of the boiler on
its base.
600
500 min
P + 200
P
A
200
75
150
C
L
520
800
FRONT

POTTERTON COMMERCIAL PRODUCTS DIVISION SECTION 2
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR 3 PAGE 5
GENERAL
This boiler is NOT SUITABLE for installation in a
normally occupied area (i.e. kitchen).
A LIFETIME GUARANTEE is available on this boiler
please refer to our standard terms and conditions for
details.
The Potterton NXR3 is a cast iron sectional boiler
available in outputs from 90kW (4-section model) to
290kW (9-section model). The heat transfer surfaces
of the NXR3 have been specially designed to
maximise the boiler efficiency and the large
combustion chamber capacity ensures
environmentally sound combustion reducing CO and
NOx emissions. Specially designed and prewired
control panels allow full boiler control and flow and
return manifolds have facilities to fit sensor pockets for
boiler management systems.
The NXR3 is suitable for running at variable low
temperatures under direct compensated control.
The boiler has match tested package burners,
available for Natural Gas, LPG, 35 Second & 28
Second Oil. Dual Fuel options are also available.
The NXR3 is suitable for use on fully pumped open
vented systems or a sealed system with a maximum
design pressure of 6-bar (87 p.s.i.) and a minimum of
1-bar (14.5 p.s.i.).
The NXR3 boiler is of the overpressure type with 5-
pass reverse flame design. The first two passes are in
the combustion chamber with the other three in the
convection tubes where the turbulence to achieve
high heat transfer is generated by the extended
surface area achieving efficiencies of 93% (net), 84%
(gross).
The NXR3 is constructed with BS1452 Grade 220
cast iron heat exchanger, constructed in accordance
with EN303.1. The boiler package meets gas and oil
requirements of M&E36 and the burners EN676.
The waterway sections are joined by cast taper
nipples and secured with tie rods. The combustion
chamber joints are sealed by heat resistant cord.
The powder coated mild steel casings have a 50mm
fibre insulation in the casing plus a 50mm fibre wrap
around the castings, thus reducing fuel consumption
and emissions.
The NXR3 is supplied unassembled, assembly tools
are provided and a list of the tools is given in Section
4.
STANDARD SUPPLY
•Unassembled cast iron sections (number
dependent on boiler output).
•Smoke box, optimising baffles, flueway door,
combustion chamber door, burner adaptor plate,
flanged flow and return connections.
•Boiler wrap round insulation
•Insulated casing
•Cleaning brush
•Flow manifold complete with sensor pocket, ¾”
screw socket and plug
•Eco control panel
CONTROLS
The NXR3 range is supplied as standard with an
integral control panel which is fitted with hours run
meters, flue thermometer, on/off, control and high/low
thermostats, limit thermostat, water thermostat, reset
button, high temperature warning light, mains on/off
light and fuse. Two volt free remote status contacts
and two hours run meters are included.
OPTIONAL EXTRAS
•3 phase burners
•Additional volt free contacts
•Fully closing air dampers on burner
•Sequence Control Options
SHIPPING - PACKAGING
The boiler package is delivered unassembled on two
pallets with the burner separately either in a carton or
on a pallet.
Pallet 1
Unassembled sections and door.
Pallet 2
Casing pack, boiler accessories, boiler fittings, tie
rods, baffles, flow and return turrets, control panel.
See Section 7 for breakdown of contents.
It is recommended that Potterton Commercial
Division’s trained engineers should carry out erection
and commissioning, as this will make valid the
LIFETIME GUARANTEE. See back page of this
manual for service office addresses
.

SECTION 2 POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
PAGE 6 NXR3
INSTALLATION
Before starting work a risk assessment should be
carried out in the boiler house and its access to
determine and ensure a safe installation and working
environment.
Any person installing or working on the boiler must be
qualified and competent, and in the case of gas fired
boilers attention is drawn to the mandatory
requirement of C.O.R.G.I registration and relevant
ACS qualifications, they must also be electrically
competent and adhere to the IEE regulations.
Manual Handling – Any person or persons moving or
lifting the boiler or any part of it, should be trained in
manual handling techniques and if necessary use
suitable lifting equipment to reduce the risk of injury to
themselves or other people.
The installation should comply with relevant British
Standard specifications, codes of practice and current
building regulations, together with any special regional
requirements of the local authorities, gas undertaking
and insurance company. All electrical wiring must
comply with the IEE regulations for the Electrical
Equipment of Buildings.
The installation of the boiler must be in accordance
with the relevant requirements of: -
•Health & Safety at Work Act 1974
•Building Regulations 2006
•Electricity at Work Regulations 1989
•Management of H&S at Work Regulations 1992
•Manual Handling Regulations 1992
•Model Water Bye-Laws 1986
•BS 7671: 1992 – Requirements for Electrical
Installations, IEE Wiring Regulations 16
th
Edition
•BS 6644: 2005 – Installation of Gas Fired Hot
Water Boilers for Inputs between 60kW and 2MW
•BS 7074: 1989 – Part 2 – Application, Selection &
Installation of Expansion Vessels & Ancillary
Equipment for Sealed Water Systems
•BS 6880: 1988 – Code of Practice for Low
Temperature Hot water Systems
•BS 779: 1989 – Cast Iron Boilers for Central
Heating & Indirect Hot Water Supply (Rated
Output 44kW and Above)
•CP342.2 – Centralised Hot Water Supply
•Gas Safety (Installation & Use) Regulations 2002
•IM/11 Flues for Commercial & Industrial Gas Fired
Boilers & Air Heaters
•IGE/UP/1 – Soundness Testing & Purging
Procedure for Non-domestic Installations
•IGE/UP/2 – Gas Installation Pipework, Boosters &
Compressors for Industrial & Commercial
Premises
•BS EN 303.1 & 303
Manufacturers notes must not be taken in any way as
overriding statutory obligations.
BOILER SITING & BASE
The boiler should be sited in accordance with BS
6644: 2005. This includes considerations for
protecting the boiler from damage, air for combustion,
clearances for service and access, temperatures,
noise levels, the disposal of boiler water and the
effects of flooding of the boiler house or seepage from
a roof top boilerhouse. See Fig. 3 for required boiler
clearances for service and access.
A level non-combustible floor capable of supporting
the weight of the boiler filled with water, see Table 3,
together with any additional weight bearing down on
the base from connections, burner, etc, must be
provided. This should be of an adequate height above
the floor so as to be raised in case of flooding, but
also low enough to allow ease of erection. Typically a
50mm concrete plinth with an area equal to that of the
plan of the boiler is adequate in most cases.
For certain special installations a sound proof plinth
may be necessary and a metal plinth resting on anti-
vibration pads is recommended in these instances.
Consideration should also be given to fitting steel
strips beneath the boiler feet for boiler base
protection, see Fig. 3 for base details.
The boiler has a water-cooled base and no special
insulation is required. When preparing a site,
reference should be made to Local Authorities and
Building regulations 2006.
L.P.G boilers should not be installed in
basements/below ground or in a well.

POTTERTON COMMERCIAL PRODUCTS DIVISION SECTION 3
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR3 PAGE 7
VENTILATION
Safe, efficient and trouble free operation of
conventionally flued boilers is vitally dependent on the
provision of an adequate supply of fresh air to the
room in which the appliance is installed. Account
must also be taken of any other fuel burning appliance
existing or to be fitted when designing the ventilation
and combustion air systems.
IMPORTANT: The use of an extractor fan in the
same room as the boiler (or in an adjacent room in
communication) can, in certain conditions,
adversely affect the safe operation of the boiler
and therefore must be avoided.
Further guidance on ventilation for gas appliances is
provided by BS 6644: 2005. For oil see relevant
Standard.
FLUE
To ensure safe and satisfactory operation the chimney
system, which may be individual or common in the
case of modular boiler installations, shall be capable
of the complete evacuation of combustion products at
all times. The effective height of the chimney
terminal(s) above the boiler(s) flue outlet(s) shall
ensure sufficient buoyancy to overcome the
resistance of the bends, tees and runs of the flue pipe
involved and shall terminate in a down draught free
zone. The number of bends used should be kept to a
minimum and runs of flue pipe less than 45° to the
horizontal should be avoided in order to comply with
the recommendations made in BS 6644: 2005 and
British Gas publication IM/11 "Flues for Commercial
and Industrial Gas Fired Boilers and Air Heaters".
The third edition of the 1956 Clean Air Act
Memorandum and the Building Regulations should be
strictly observed and approval obtained where
applicable, combustion chamber details are given in
section 1.
The flue system must be designed to work specifically
to remove the products of combustion.
IMPORTANT: 90° square bends must not be used
on the flue system, including the boiler flue
spigot, a straight length followed by an "easy
sweep" or lobster back bend should be used.
FLUE SIZE CONSIDERATIONS
Nominal flue connection sizes are given in Table 3,
these sizes refer to the boiler flue connection spigot.
The actual size of the flue system will depend on
individual site applications. Below are general
considerations on sizing flue systems.
Horizontal Flue Runs
Horizontal flue runs are not recommended particularly
over 3m in length, where these are unavoidable
advice should be sought from a flue system specialist.
Common Flue Systems
Where multiple boilers are installed on a common flue
system then the flue system should be designed to
ensure the correct operation of the flue on varying
load conditions. In particular that the appliance flue
draught is within the operating parameter under full
load and partial load conditions. For safe and reliable
operation of the boiler plant it is recommended that
the variance in flue draught available at each
appliance under full and part load operation is
designed to a minimum.
(It is essential that the services of a specialist flue
system manufacturer are sought for the design of
common flue systems).
For further information regarding ventilation and
flueing see relevant British Standard publication
BS6644: 2005.
THE ABOVE RECOMMENDATIONS ARE FOR
GENERAL GUIDANCE ONLY. POTTERTON
COMMERCIAL DIVISION CANNOT ACCEPT
RESPONSIBILITY FOR FLUE SYSTEM DESIGNS
BASED ON THE ABOVE RECOMMENDATIONS.
WATER CIRCULATION SYSTEMS
The water circulation system should be indirect and
installed in accordance with the relevant parts of
British Standards Codes of Practice CP342.2 and BS
6644: 2005.
The maximum and minimum design temperature
differential across the boiler should be 20°C and 10°C
and the boiler should be prevented from operating
with flow rates giving a temperature difference across
the boiler greater than 25°C based on the full boiler
output.

SECTION 3 POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
PAGE 8 NXR3
Boilers operating under constant flow conditions can
be more accurately controlled and are not subject to
excessive temperature stresses.
The boilers MUST NOT be fired under any
circumstances with less than the minimum water flow.
On systems with variable flow rates due to flow
reducing devices, ie. TRVs, zone valves, etc, or where
the minimum heat demand, ie. summer domestic hot
water load, does not achieve the minimum boiler flow
rate then consideration shall be given to incorporating
a primary loop system.
It is recommended that the system is designed to give
a constant boiler flow rate.
BOILER PROTECTION
The provision of pump overrun by a time delay relay
or a thermostat situated in the flow pipe close to the
boiler is essential to remove residual heat from the
boiler, see Fig. 21, section 6.
Unions and isolating valves should be fitted to the flow
and return manifolds so that the boiler can be isolated
from the system if the need arises. Your legal
obligations must be adhered to. (i.e. appropriate
safety valves must be fitted).
SYSTEM WATER QUALITY
High efficiency boiler systems require the water
quality of the system water to be controlled by the use
of inhibitors to maintain a neutral Ph and inhibit
corrosion. Additionally the water system should be
free of leaks to prevent raw water make up which will
dilute any inhibitors, promote corrosion and form lime
scale.
Existing Systems
On existing systems where boilers are being replaced
due to failure then the cause should be investigated
before installing new boilers. This can normally be
achieved by cutting open a failed boiler section and
examination for system debris or contamination.
Lime scale is a positive indicator of continuous system
water make up due to water loss. Evidence of
magnetite (black sludge) in the system and the
formation of gas in radiators causing air locking is a
positive indicator of corrosion.
Where an old system shows evidence of
contamination then system cleaning should be carried
out before installation of new boilers. The heating
system should be chemically flushed to remove any
lime scale or corrosion and a corrosion and lime scale
inhibitor added. Lime scale descalers if incorrectly
used could cause any remaining system debris to
continue to breakdown and contaminate the new
boiler causing boiler failure.
Advice on system cleaning and suitable products
should be sought from specialist suppliers of system
cleaners such as Fernox or Sentinel.
It is important to note that corrosion inhibitor can only
be used in an attempt to prevent corrosion from
occurring, where a system has an existing corrosion
problem, inhibitors will be ineffective and the system
requires cleaning.
On existing systems where comprehensive descaling
and desludging cannot be carried out then
consideration should be given to separating the new
boiler system from the existing system pipe work by
the use of plate heat exchangers.
New Systems
New pipe work systems should be thoroughly flushed
with a suitable cleaning agent to remove debris and
flux residues before filling. The system water should
be dosed with a suitable corrosion and lime scale
inhibitor.
System Water Monitoring
The system water should be monitored as part of a
maintenance programme to ensure the following:-
Raw water make up is not occurring.
Corrosion and lime scale Inhibitors are still active
Water Ph is below Ph 8.5 other wise on systems with
aluminium content, component failures may occur.
SEALED SYSTEMS
General
Potterton Commercial boilers are suitable for use on
sealed systems designed in accordance with BS
6644: 2005 and BS 6880 Part 2. In addition,
reference should be made to the Health & Safety
Executive guidance note PM5 "Automatically
Controlled Steam & Hot Water Boilers".