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MULTIPOINT FF

Main MULTIPOINT FF User Operating, Installation And Servicing Instructions

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Page 1
MULTIPOINT FF
Room Sealed Fan-Assisted Water Heater
6 720 607 160 (04.02) JS
Please leave these instructions with the user
User Operating, Installation and Servicing Instructions
Page 2
Natural Gas
Main Multipoint FF G.C. No 52-467-02
User information
Your Main Multipoint FF is designed to meet all relevant standards.
Main provide a 12 month guarantee on the appliance. The guarantee operates from the date installation is completed for the customer who is the original owner.
Any component or part which becomes defective during the guarantee period as a result of faulty workmanship or materials whilst in normal use will be repaired or replaced free of charge.
This appliance conforms to European Standard EN 26.
Type test for purpose certified by Notified Body CE-0087.
Product/Production certified by Notified Body CE-0464. For GB / IE only.
Care must be taken when lifting and handling this appliance, seek assistance where appropriate. Protective equipement (e.g. gloves) should be warn as necessary.
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1. User’s operating instructions ...................................... 4
2. General layout ............................................................... 5
3. Technical Data ...............................................................6
4. Dimensions and fixings .................................................7
5. General inormation ....................................................... 8
6. Installation Regulations ................................................ 8
7. Siting the Appliance ..................................................... 9
8. Siting the Flue Terminal ............................................ 10
9. Air supply ....................................................................... 11
10. Gas supply ................................................................... 11
11. Electrical ...................................................................... 13
12. Installation .................................................................... 13
13. Commissioning ............................................................ 18
14. Performance optimization ......................................... 19
15. Inspection and Servicing .......................................... 20
16. Replacement of parts ................................................ 22
17. Fault Finding ................................................................ 24
18. Short Parts List ........................................................... 25
19. Notes ............................................................................. 26
page
Contents
Section
Page 4
1. User’s Operating Instructions
Switching on and off:
On
1. Turn the main switch to position I.
Water temperature control:
1. Turn the control to the desired temperature.
Fault indication:
The appliance incorporates a fault indication system. Fault indication is shown by a red light on the reset button. If pressing the reset button does not restart the appliance, consult your installer.
1. Turn the main switch to position 0.
Off
The hot water temperature is set by the control position.
Turn the control clockwise to increase the temperature and anticlockwise to decrease.
When the control is set at the maximum position the highest water temperature is achieved by controlling the flow at the tap.
Note: if the appliance is to be left unused in an unheated area during cold weather the electricity, gas and water supplies should be isolated and the system drained. Your installer will be able to advise you.
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2. General Layout
Fig. 3
Appliance water flow diagram.
Fig. 4
Appliance components
4 Electronic control box 5 Heat sensor
6 Water flow sensor 10 Main switch 11 Temperature control 12 Reset button 13 Burner Indicator Button
17 Safety solenoid EV1 25 Water filter 28 Hot water pipe 29 Cold water pipe 35 Gas inlet pipe 42 Gas filter 49 Injector 50 Burner 55 Heat exchanger 92 Gas valve
117 Ignition electrode 118 Sensing electrode 119 Temperature limit stat 200 Minimum gas flow adjustment
screw 201 Maximum gas flow adjuster 210 Main valve 221 Flue support ring 222 Exhaust gas collector 224 Flow sensor 226 Fan 228 Pressure switch 229 Sealed box
Page 6
3. Technical Data
T ABLE 1 - GENERAL
T ABLE 3 - PERFORMANCE
T ABLE 2 - FLUE DET AILS
The appliance and flue components are packed in separate cartons. The appliance is for use with Natural Gas only. The Installation notes in these Instructions, particularly those regarding Maximum Flue Lengths and Configuration Options, take precedence over any universal instructions included in flue component packs.
Wall hole size 110 mm Diameter Standard Horizontal Flue Kit 490mm wall thickness rear outlet Sales Code 430183 400mm wall thickness side outlet Horizontal Flue Kit 680mm wall thickness rear outlet Sales Code 430184 590mm wall thickness side outlet Flue Extension 1m Sales Code B4286 90° Bend Kit Sales Code 31/19034 135° Bend Kit Sales Code 31/19035 Telescopic Flue In Line Elbow Adaptor Sales Code 430174 Vertical Adaptor Sales Code 238014 Concentric Vertical Flue Kit Sales Code 238015
Flat roof flashing kit Sales Code 31/19040 Pitched roof flashing kit Sales Code 31/19041 Wall liner / internal flu e fixing kit Sales Code 238012 Terminal guard Sales Code 205792
Maximum cold water supply inlet pressure 12 bar
Minimum cold water supply inlet pressure to operate the appliance 0.3 bar
Domestic hot water delivery with temperature control knob fully anticlockwise 4 to 14 litres/minute at
25°C tem
p
erature rise
Domestic hot water delivery with temperature control knob fully clockwise 2.5 to 6 litres/minute at
55°C tem
p
erature rise
Natural Gas
Gas category
I
2H
Appliance Type
C
12
, C
32
Minimum rated output 10 kW Maximum rated output 23.8 kW Rated input (Net) 27 kW
Gas rate (CV 34 MJ/m
3
)2.9 m
3
/hr Inlet pressure 20 mbar Number of injectors 14 Injector diameter 1.20 mm Injector marking 120 Burner pressure (max) 12.7 mbar Burner pressure (min) 2.5 mbar Height 700 mm Width 388 mm Depth 220 mm Dry weight 20 kg Gas connection 15mm Copper Hot/cold water connections 15mm Copper Electrical
p
rotection IPX4D
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4. Dimensions and Fixings
Fig. 5
Page 8
5. General Information
5.1 GENERAL INSTALLATION If the appliance is to be fitted into a compartment, the compartment must conform to the requiremens of BS 6798. Do not place anything on top of the appliance. The clearances specified for servicing must be maintained.
5.2 SHOWERS If a shower control is supplied from the appliance it should be of the thermostatic or pressure balanced type. Thermostatic type shower valves provide the best comfort and guard against water at too high a temperature. Existing controls may not be suitable - refer to the shower valve manufacturer.
6.1 Warning - Check the information on the data plate is compatible with local conditions.
The installation must be carried out by a CORGI Registered Installer or other registered competent person and be in accordance with the relevant requirements of the current Gas Safety (Installation and Use) Regulations, the building regulations (Scotland) (Consolidation), the local building regulations, the current I.E.E Wiring Regulations and the bye laws of the local water undertaking. Where no specific instruction is given, reference should be made to the relevant British Standard Code of Practice. For Ireland, install in accordance with IS 813 “Installation of Gas Appliances”.
6.2 B.S Codes of Practice Standard Scope BS 6891 Gas Installation BS 5546 Installation of water supplies for
domestic purposes BS 6798 Installation of gas fired hot water boilers BS 5440 Part1 Flues BS 5440 Part2 Ventilation
WARNING - The addition of anything that may interfere with the normal operation of the appliance without the express written permission of Baxi Potterton could invalidate the appliance warranty and infringe the Gas Safety (Installation and Use) Regulations.
6. Installation Regulations
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7. Siting the Appliance
7.1 The appliance is NOT suitable for external installation.
7.2 The appliance is NOT suitable for SEDUCT application.
7.3 The appliance does not require any special wall protection.
7.4 The wall must be capable of supporting the weight of the appliance. See Technical Data – Table 1.
7.5 If the appliance is to be fitted in a timber framed building, refer to the Institute of Gas Engineers, ”Guide for gas installations in timber framed housing” IGE/UP/7.
7.6 The following advisable clearances must be available for installation and for servicing:
7.7 The minimum clearances required for Operation are:
7.8 The appliance can be installed in a cupboard used for airing clothes provided that requirements of BS 6798 and BS 5440:2 are strictly followed. See section 9 for further detail.
7.9 The airing space must be separated from the appliance space by a perforated non-combustible partition. Expanded metal or rigid wire mesh are acceptable provided that the major dimension is less than 13 mm. See BS 6798
Table 4
Above case 120 mm In front 600 mm Below 50 mm Ri
g
ht hand side 10 mm
Left hand side 10 mm
Table 5
Above case 120 mm In front 60 mm Below 50 mm Ri
g
ht hand side 10 mm
Left hand side 10 mm
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8. Siting the Flue Terminal
See Fig. 7.
8.1 The flue must be installed as specified in BS 5440:Part 1.
8.2 The terminal must not cause an obstruction nor the discharge cause a nuisance.
8.3 If the terminal is fitted within 1000 mm of a plastic or painted gutter or within 500 mm of painted eaves then an aluminium shield at least 1000 mm long should be fitted to the underside of the gutter or painted surface.
8.4 If a terminal is fitted less than 2 metres above a surface to which persons have access then a guard must be fitted.
8.5 The terminal guard must be evenly spaced about the flue terminal and fixed to the wall using plated screws.
8.6 In certain weather conditions a terminal may plume when the appliance is operated. Siting where this could cause a nuisance should be avoided.
8.7 Take care to ensure that combustion products do not enter ventilated roof voids.
Fig. 7 - Siting of the flue terminal
Fig. 6
TERMINAL POSITION MIN. DIST.
A -
directly below an openable window or other opening e.g. air brick. 300 mm
B - Below gutters, soils pipes or drain pipes.
75 mm
C - Below eaves.
200 mm
D - Below balconies or car port roof.
200 mm
E - From verti cal drain pipes and soil pipes.
150 mm
F - From internal or external corners.
300 mm
G - Above ground, roof or balcony level.
300 mm
H - From a surface facing a terminal.
600 mm
TERMINAL POSITION MIN. DIS.
I - From a terminal facing a terminal.
1200 mm
J -
From an opening in a ca r port (e .g. door window) into dwelling.
1200 mm
K -
Vertically from a terminal on the same wall.
1500 mm
L -
Horizo ntally from a terminal on the same wall.
300 mm
M - From door, window or air vent 300 m m
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9. Air Supply
9.1 The appliance does not require a separate vent for combustion air.
9.2 The appliance may be installed in an unvented compartment.
9.3 There must be sufficient clearance around the appliance to allow proper circulation of air. The clearances required for operation will normally be adequate.
9.4 Refer to BS 6798 and BS5440:2 for additional information.
10. Gas Supply
10.1 The gas installation should be in accordance with BS 6891.
10.2 The connection to the appliance is 15mm compression via the gas isolation valve supplied.
10.3 Ensure that the pipework from the meter to the appliance is of adequate size. If the appliance gas rate cannot be achieved, the specified hot water conditions will not be reached.
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Fig. 8
5 Temperature sensor 6 Water flow sensor 7 Fuse1,25A 8 Fuse 2A
92 Gas valve 117 Ignition electrode 118 Sensing electrode 119 Temperature limit stat
226 Fa n 228 Pressure switch
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The installation must be carried out by a competent person.
12.1 INITIAL PREPARATION
12.1.1 Unpack the appliance and take care to remove the fascia and the installation kit which are located on the top and on the bottom of the polystyrene packing. Remove the White painted Flue Elbow inclusive of sealing rings. The installation kit (Fig. 9) consists of the following: Gas inlet:
1x Flanged Copper Pipe, Compression Nut, fibre washer 1x Isolation valve, 2 x Compression nuts and Olives
Water Inlet:
1x Copper inlet elbow, Compression Nut, fibre washer 1x Isolation valve, 2 x Compression nuts and Olives
Water Outlet:
1x Copper inlet elbow Compression nut, Fibre washer
12.1.2 Lay the appliance on its back, unfasten the two retaining screws and lift the case clear (Fig. 10). Place the paper mounting template in the required location on the wall and mark the positions of the flue and the three mounting holes (Fig. 11). Cut the flue hole and drill and plug the mounting holes. Fix the wall mounting bracket, hang the appliance and secure to the wall through the hole located in the valve mounting bracket. To increase access to this area of the appliance the control box may be temporarily re positioned, depress the two curved finger tab latches on top of the control box and withdraw forward. Use the integral moulded hooks to hang the control from the combustion box.
12. Installation
See Fig. 8.
11.1 M AIN S SU PP LY.
230 V ~, 50 Hz, 65 watts.
11.2 It must be possible to completely isolate the
appliance.
11.3 The following connection alternatives must be used:
A 3 amp fused three-pin plug and unswitched shuttered socket outlet (both complying with the requirements of BS
1363) or a double pole isolator with a contact separation of
3mm in all poles and supplying the appliance and controls only.
11.4 The appliance must be earthed.
11.5 Mains Cable. 0.75mm2 (24 x 0.20mm) to BS 6500
Table 16.
11.6 The wiring between the appliance and the electrical
supply must comply with current IEE Wiring Regulations and any local regulations which apply.
11.7 SAFET Y C H E C K .
After installation or in the event of an electrical fault the electrical system shall be checked for short circuits, fuse failure, incorrect polarity of connections, earth continuity and resistance to earth.
11. Electrical
Fig. 9
Fig. 10
Fig. 11
Page 14
Fig. 12
12.2 F L U E RESTR ICTION The Installation notes in these Instructions, particularly those regarding Maximum Flue Lengths and Configuration Options, take precedence over any universal instructions included in flue component packs.
To ensure the correct operation of the appliance, certain flue lengths require one of two flue restrictor rings to be fitted to the fan inlet. (Fig. 12).
Restrictor requirements for the horizontal and vertical flue configurations shown in Figures13 and 17 are as per tables 9 and 10 respectively.
Fig. 13
Table 9
Flue length
Restrictor
Diameter
Up to 2.0 m
58
2.0 m – 3.0 m
68
3.0 m – 4.0 m Max
None
Up to 2.0 m 68
2.0 m – 3.5 m Max None
White Flue Elbow only –
no additional bends
Configuration
A
Horizontal configuration
Direct vertical rise from the appliance: Vertical Adapter
+ 1 x 90 degree bend
Configuration
E
Flue length
Restrictor
D
iameter
Configuration ANo additional bends
Straight vertical
Up to 4.0 m Max 58
Up to 3.5 m 58
3.5 m – 4.0 m Max 68 Up to 2.5 m 58
2.5 m – 4.0 m Max 68
Vertical configuration
Direct vertical rise from the appliance: Vertical Adapter
+ 1 x 90 degree bend
Configuration
C
2 x 45 degree bends
Configuration
B
Table 10
12.2.1 Restrictor Ring Installation. Remove the electrical connections to the fan. Unfasten the fixing screws (Fig. 12, pos. 1) securing the fan mounting plate to the appliance. Remove the fan, unfasten the screws securing the mounting plate to the fan (Fig. 12, pos 3). Place the restrictor ring between the fan and the mounting plate (Fig. 12, pos. 2), align the holes and re secure (Fig. 12, pos 3). Re assemble the fan to the appliance and replace the electrical connections.
12.3 FITTING A HORIZONTAL FLUE Possible flue configurations are as per Fig 13. The concentric horizontal flue system has an inner flue tube diameter of 60 mm and an outer air duct diameter of 100 mm. Standard horizontal flue terminal kits and flue extension components are detailed in Section 3, Page 6, Table 2 ­Flue Details. The Maximum and Minimum flue lengths available for horizontal configurations are as per table 11.
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Measure
40mm
Top
View
Wall
Rear
Flue
Side Flue
10mm
Wall
Thickness
Drip Ring
10mm
Fig. 14
12.3.1 Standard Telescopic Flue Installation:
Determine appropriate flue length (Fig. 14)
Rear Flue Application - Measure wall thickness, add 60mm.
Side flue application – Measure distance from outer face of wall to centre line of appliance, deduct 55mm.
Set the Telescopic flue tubes to the length determined. Drill through the pilot hole in the outer duct and secure with the self tapping screw provided. Wrap tape around joint on the outer duct to seal the flue, slide the drip ring in position to coincide with the wall cavity. Slide flue through the hole in wall until it stops against the bayonet pin.
For side flue Applications – re orient flue support ring on top of appliance: (Fig. 15) Unfasten Flue Support Ring (x 4 screws). Turn ring 90 degrees to left or right as appropriate. Re secure.
Position the white painted Flue Elbow onto the Flue Support Ring ensuring the Silicone Seal engages over the Fan Outlet, secure the Elbow with 3 off screws provided.
Slide the Flue forward from the wall until it engages in the white painted elbow’s bayonet connection, twist anticlockwise to lock. ( Fig. 16) Drill through the pilot hole in the white flue elbow and lock the flue in position with self tapping screw provided. Make good the opening around the flue.
12.3.2Extended Horizontal Flue Installation:
The flue may be extended to the maximum configuration lengths shown in Table 11 with the application of 1m extension kits, 45 and 90 degree Elbows and a Telescopic Flue In Line Elbow Adapter. In all configurations the first section of Standard Horizontal Flue is located in the white painted Flue Elbow, the second section terminates the flue after the extension components. The 1m extensions can be cut to length as required.
Extended Horizontal flue with direct vertical rise: The flue may be extended with a direct vertical rise from the appliance with the application of a Vertical Flue Adapter, 1m extension kits, 90 degree elbow and a telescopic flue in line elbow adapter. The maximum flue length for this configuration is as per table 11.
Fig. 15
Flue Elbow
Flue Elbow
Connect
Flue
Lock Flue
into
position
Drill and screw elbow and flue
The Flue Elbow
Arrow MUST align
to Flue Pin as shown
Fig. 16
Table 11
Flue length Restrictor
Configuration AWhite flue elbow on ly –
no additional bends
4.0 m Max Table 9
Configuration BWhite Flue El bow +
1 x 90 degr ee bend
2.2 m Max
None
required
Configuration CWhite Flue El bow +
2x 45 degree bends
2.5 m Max
None
required
Configuration DWhite Flue El bow +
2x 90 degree bends
1.8 m Max
None
required
Configuration
E
Direct vertical rise fr om the appliance: Vertical Adapter
+ 1 x 90 degree bend
3.5 m Max Table 9
Horizontal configuration
Minimum flue length: Rear flue, 230mm wa ll thickness.
0.29 m Min
Page 16
12.4 FITTING A VERTICAL FLUE Possible configurations of flue are as per Fig. 17. Vertical flue kits and flue extension components are detailed in Section 3, Page 6, Table 2 - Flue Details. For vertical application the white painted elbow is discarded. The Maximum and Minimum flue lengths available for vertical configurations are as per table 12.
Table 12
Fig. 17
Appliance
Adaptor
Terminal
Assembly
Flue Tube
Adaptor
Assembly
Contact Rim Lip
Appliance
Adaptor
Contact Rim
Pitched
Roof
Flashing
Flat Roof Flashing
Roof
Flue Tube
Adaptor
Assembly
Outer
Terminal
Tube
Inner
Terminal
Tube
Fig. 18
12.4.1 Standard Vertical installation:
Secure the flashing kit to the roof. Refer to Fig. 18. Measure the distance from the contact rim on the flashing kit to the flue support ring on top of the boiler.
This is dimension ‘Y’.
Lay the Terminal Assembly flat and loosely connect the Flue Tube Adaptor Assembly and the Appliance Adaptor. Measure the overall length from the contact rim lip to the base of the adaptor. This is dimension ‘X’. Subtract dimension ‘Y’ (actual) from ‘X’ (uncut), add 3mm, this will give the cutting length ‘Z’. Take the assembly apart and shorten the inner and outer tubes by dimension ‘Z’. Remove any burrs.
Fit the Appliance Adaptor to the top of the appliance using 3 screws provided. Slide the Flue Tube Assembly onto the Appliance Adaptor. From the roof, slide the Terminal Assembly through the flashing kit. From the appliance side, position the terminal clamp bracket and loosely secure to the roof. Fig. 19. Locate the base of the Terminal Assembly into the Flue Tube Adaptor Assembly From the roof, ensure the contact rim of the flashing kit has slid up inside the outer tube of the Terminal Assembly. Secure the Terminal Assembly to the Flue Adaptor Assembly and Flue Adaptor Assembly to the Appliance Adaptor. Drill (2mm drill) through the pilot holes and secure using the screws provided. Fully secure the Terminal clamp bracket. Tape around both joints to give an air tight seal. Make good around the flashing kit.
Bracket can pivot to angle of roof
Roof or ceiling member
Bend bracket to length
Extension bracket (100mm Dia.)
Terminal support bracket (125mm Dia.)
Fig. 19
Flue length Restrictor
Configuration ANo additional bends
Straight vertical
4.0 m Max Table 10
Configuration
B
2 x 45 degree bends 4.0 m Max Table 10
Configuration
C
2 x 90 de gree bend 4.0 m Max Tab le 10
Vertical configuration
Minimum flue length: 1.4 m Min
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12.4.2 Extended Vertical Installation
Vertical flue lengths may be extended to the limits as stated in Table 12 using standard 1m extension kits and 45 and 90 degree elbows. Secure the Flashing kit to the roof. Refer to Fig. 20. From the roof, slide the Terminal Assembly through the flashing kit, ensure the contact rim of the flashing kit has slid up inside the outer tube of the Terminal Assembly. From the appliance side, position the Terminal clamp bracket and loosely secure to the roof. Fig. 15. Fit the Appliance Adaptor to the top of the appliance using 3 screws provided. Assemble the Flue Extension(s), (elbows, seals, clamps where used), centralising springs and fixing brackets until the dimension between the end of the Flue Tube Adaptor Assembly and the bottom of the last Extension Tube flange is less than 1m, measure this dimension ‘W’. Subtract 3mm from dimension ‘W’, mark this dimension onto the final Extension Tube, both inner and outer and cut the plane end (Not the flange end). Remove all burrs. Temporarily lift the Terminal Assembly and slide the extension tube fixing bracket (if required) and the ceiling seal onto the outer extension tube. Position the final Inner Extension Tube. Position the centralising spring. Position the final Outer Extension Tube. Lower and reconnect the Terminal Assembly, drill (2mm drill) through the pilot holes in the Outer Extension Tube(s) and Appliance Adaptor. Secure using the screws provided. Fully tighten the fixing bracket(s) on the extension(s) and the terminal clamp bracket in the roof. Make good around the Flashing Kit.
12.5 MAKING THE GAS CONNECTION Note: The whole of the gas installation should be inspected and tested for soundness and purged in accordance with the recommendations of BS 6891. Make up the gas supply to the connection on the gas control Valve using the Gas Inlet Kit. Fit the gas Isolation Valve as close as possible to the appliance (Fig. 21). Check for soundness prior to making the water connections.
12.6 MAKING THE WATER CONNECTIONS
Connect the appliance to the incoming cold water supply using the Water Inlet Kit. Fit the Isolation Valve as close as possible to the Appliance (Fig. 21). Connect the appliance to the domestic hot water System using the Water Outlet Kit. (Fig. 21). Turn on the water supply to the appliance. Open the Isolation Valve on the inlet to the appliance, open the hot water taps and purge the system of air.
12.7 MAKING THE ELECTRICAL CONNECTIONS The Appliance is supplied with an integral lead and fused Plug. The Appliance may be permanently wired to a double pole Isolator.
Fig. 20
Flashing kit
Roof
Terminal
bracket
Flue tube
adaptor
assembly
Outer
extension
tube
Flue tube
adaptor
assembly
Terminal
assembly
Appliance
adaptor
Plain end
Measure 'W' - 3mm
and cut inner
extension
Measure 'W' - 3mm
and cut outer
extension
W
W
25
Example
of flue
measurement
with one
flue
extension
Example
of flue
measurement
with two
flue
extensions
Fig. 21
Page 18
Fig. 22
Before commissioning the appliance, the gas installation must be purged and tested for gas soundness in accordance with BS 6891.
13.1) Ensure the gas isolation valve is turned off.
13.2) Remove the appliance outer case.
13.3) To increase access to the pressure test point, the control box may be temporarily repositioned, depress the two curved finger tab latches on top of the control box and withdraw forward. Use the integral moulded hooks to hang the control from the combustion box (Fig. 22).
13.4) Loosen screw (pos. 4) and connect a pressure gauge to the test point. Replace the control box and outer case.
13.5) Turn on the gas isolation valve.
13.6) Move main switch to position I (On). Set the temperature control knob to Maximum. Fully open any hot water tap. Note: On initial light up, or after prolonged shut down, the establishment of a flame may take several attempts due to the presence of air in the gas supply pipe.
13.7) Check the dynamic inlet gas pressure is 20.0 mbar. If the pressure is not correct then check the gas supply to the appliance. If the pressure is correct, turn off the hot water tap and move the main switch to the off position. Remove the outer case and reposition the control box as in 13.3. Turn off the gas isolation valve. Remove the pressure gauge and tighten screw (pos. 4).
13.8) The burner pressure is factory set and should not require adjustment. To confirm the burner pressure stated in table 1, loosen screw (pos 1) and connect a pressure gauge to the pressure test point. Replace the control box and outer case, turn on the gas isolation valve. With the main switch in position O (off), on the control box front turn the temperature control to position 60. Press and hold the burner indicator button (Fig. 3, key
13). Move the main switch to position I (on), the green burner indicator blinks. Fully open a hot tap, confirm the burner pressure, turn the main switch to position O (off). Turn off the hot water tap, close the gas isolation valve. Remove the case and pressure gauge, tighten screw (pos 1). Replace controls and outer case.
13.9) Should the burner pressure require adjustment, refer to section 15.5, Service Adjustment.
13.10) Open gas Isolation Valve, fit the fascia and set the Main Switch to I (on), the appliance is now ready for operation.
13.11) On completion of the commissioning and testing of the system, the installer should:
13.11.1) Give the Instructions to the user for safe keeping.
13.11.2) Explain and demonstrate the lighting and shutdown procedures.
13.11.3) Advise the user of the precautions necessary to prevent damage to the system and to the building in the event of the system remaining inoperative during frost conditions.
13.11.4) Recommend that the appliance is serviced annually for reasons of safety and economy and that the servicing must be carried out by a competent person.
13. Commissioning
1 Burner pressure measuring point 2 Minimum gas flow ajustment screw 3 Maximum gas flow adjuster 4 Gas supply pressure measuring point
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14. Performance optimization
Performance optimization is a process that informs the appliance about its installation/working conditions so that it can adjust itself accordingly. The appliance is thus more responsive.
14.1) Set the main switch to position O (off).
14.2) On the control unit front panel, place the rotary temperature control knob at position ‘45’.
14.3) Press and hold the burner indicator button (Fig 3, key13) and set the main switch to position I (on). The green burner indicator button blinks.
The appliance is now in performance optimisation mode.
14.4) Fully open a hot water tap.
14.5) Operate the appliance for approximately 5 minutes.
14.6) Set the main switch to position O (off).
Close the hot water tap and set the main switch back to position I (on). The performance optimisation operation is complete.
Fig. 23
Page 20
15. Inspection and Servicing
Warning
Isolate electrical supply before servicing the appliance. For reasons of safety and economy it is recommend that the appliance is serviced annually. The servicing must be carried out by a competent person. Before commencing any service operation turn off the gas supply at the main gas isolation valve. Ensure that the appliance is cool.
ACCESS FOR SERVICING
Pull of the fascia and undo the two fixing screws. Lift the outer case clear.
15.1 Heat Exchanger
Undo the two retaining screws and remove the holding bracket. Inspect and if necessary clean the heat exchanger flueways.
15.2 Main Burner
Disconnect the wire connections to the ignition and sensing electrodes. Undo the union connection below the burner. Remove and retain the fibre washer. Lift and rotate the front edge of the burner backward through 180 degrees. With the burner oriented horizontally and upside down, withdraw forward beneath the combustion chamber skirt. (fig. 23). Inspect and clean the injectors if necessary. Inspect and clean the main burner bars if necessary.
15.3 Water filter
Close the water inlet isolation valve. Open a hot water tap, open the drain screw and drain the appliance. Dismantle the cold water inlet pipe. Clean the water filter/regulator.
15.4 Re-assembling the Appliance
Re-assemble the appliance in reverse order ensuring the following: The washer in the main gas line union is correctly located. The seals around the ignition leads and cable entries are correctly seated in the combustion chamber base. Turn on the gas supply at the main gas isolation valve and check for gas soundness BS 6891 while the appliance is running. Re-commission the appliance as detailed in Section 13.
Fig. 25
Fig. 24
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15.5 Service adjustment
15.5.1 Max and Min gas rate adjustment
Do NOT use magnetic tools to adjust the gas valve. Always adjust the MAXIMUM rate BEFORE the MINIMUM. It is only necessary to adjust the minimum gas rate if the burner frequently goes out when the water flow is reduced toward the minimum specified.
Set the main switch to position O (off). On the control unit front panel, place the rotary temperature control knob at position ‘60’, press and hold the burner indicator button (Fig 3, key 13) and set the main switch to position I (on). The green burner indicator button blinks.
Open a hot water tap. The appliance is operating at its maximum power. Perform the maximum gas adjustment on the corresponding screw (Fig 22 pos 3) to the value stated in Table 1, page 6.
On the control unit front panel, place the rotary temperature control knob at position ‘55’. The appliance works at its minimum power. Perform the minimum gas adjustment on the corresponding screw (Fig. 22, pos. 2) to the value stated in Table 1.
Replace the transparent plastic cover on the gas valve and confirm the adjustments for maximum and minimum by repositioning the rotary temperature control knob at position ‘60’ and position ‘55’ and observing the pressures.
Set the main switch to position O (off), close the hot water tap and set the main switch to position I (on). The setting of maximum and minimum gas rates is now complete.
15.5.2 Gas Type
The control unit is factory set for the appliance gas type (natural gas). It may be necessary to repeat the instruction after a major technical intervention. This task is made electronically by programming the control unit. Set the main switch to position O (off). On the control unit front panel, place the rotary tempera­ture control knob at position ‘35’ (for natural gas). Press and hold the burner indicator button ( Fig 3, key13) and set the main switch to position I (on). The green burner indica­tor button blinks. Without opening any hot water tap, hold in the burner indi­cator button for approximately 2 seconds until the red reset button blinks. Switch the appliance off and back on again.
The gas type selection operation is complete.
Fig. 26 - Max. adjustment position
Fig. 27 - Min. adjustment position
Fig. 28 - Gas type selection
Page 22
16. Replacement of parts
Warning: Isolate electrical supply before servicing the
appliance.
Any servicing or parts replacement must be carried out by a competent person. Use only genuine Manufacturer’s Parts. Before commencing servicing or parts replacement turn off the gas supply at the main gas isolation valve and ensure that the appliance is cool.
16.1 Main Burner
Disconnect the spark electrode and the sensing electrode at the main burner. Remove the two screws retaining the bracket burner front and lift the complete assembly clear. Undo the union connection below the burner. Remove and retain the fibre washer. Lift and rotate the front edge of the burner backward through 180 degrees. With the burner oriented horizontally and upside down, withdraw forward beneath the combustion chamber skirt. Replace the burner and re-assemble in reverse order.
16.2 Spark Electrode / Sensing electrode
Remove main burner as described in Section 16.1 and replace faulty components.
16.3 Heat Exchanger
Isolate the appliance from the incoming cold water supply, open a hot tap and drain down the appliance via the fitted drain cock. Undo the two retaining screws from the heat exhanger bracket. Disconnect the heat exchanger inlet and flow pipes at the base of the combustion chamber. Remove the locknuts from the heat exchanger inlet and outlet connections and lift the heat exchanger clear. Replace the heat exchanger and re-assemble in reverse order.
16.4 Water sensor (Turbine)
Isolate the appliance from the incoming cold water supply, open a hot water tap and drain down the appliance via the fitted drain cock. Disconnect the temperature sensor from the inlet water pipe. Undo the wire connections between the control box and and the water sensor (turbine). Remove the two spring clips and replace the turbine. Reassemble in reverse order.
16.5 Gas Valve
Place the control box in maintenance position as described in Section 13.3. Undo all wire connections to the gas valve. Undo the connection between the gas valve and the burner connector. Remove the two screws securing the inlet end of the valve to the mounting bracket, remove the valve. Replace the gas valve and re-assemble in reverse order. Check inlet pressure and Max and Min burner pressures
Page 23
236 720 607 160
as per Section 15.5.1.
16.6 Control Unit
Unfasten the two screws securing the front panel of the control unit and remove. Disconnect inlet cable and all wiring connections. Remove control unit by depressing the two curved finger tabs on top of the box and withdraw forward. Replace the control unit and reconnect the wiring. Carry out Gas Type selection as in Section 15.5.2 and Performance Optimisation as Section 14.
16.7 Fuses
Unfasten the two screws securing the front panel of the control unit and remove. Replace appropriate fuse as per Fig 8, key 7 or 8.
16.8 Fan
Remove all wiring connections from the fan. Remove the pressure sensing tubes from the fan noting their position, black to the top, clear to the bottom connection. Remove the four fixing screws securing the fan to the appliance. Remove the fan and check for a restrictor ring as per Section 12.2, Tables 9 or 10, remove restrictor and place with new fan as appropriate (Fig 12). Re assemble in reverse order.
16.9 Pressure switch
Remove the wiring connections. Remove the pressure sensing tubes, noting their position, black to the bottom, clear to the top. Unfasten the retaining screw, replace the switch.
Page 24
17. Fault Finding
Note: Installation, maintenance and repairs must be carried out only by a competent person.
Page 25
256 720 607 160
18. Short Parts List
Item
Baxi Potterton
Number
Spark Electrode 5111115 Sensing Electrode 5111116 Flow Sensor 5111117 Control Unit 5111118 Fuse T 1.25A 5111119 Fuse 2A 5111120 Pressure Switch 5111121 Fan 5111122 Gas Valve 5111123
Page 26
19. Notes
Page 27
276 720 607 160
Page 28
GENERAL ENQUIRIES (GB)
08706 060 780
TECHNICAL (GB)
08706 049 049
SERVICE (GB)
08706 096 096
LITERATURE REQUEST (GB)
08706 060 623
TECHNICAL (IE)
1850 560 570
Baxi Potterton A Trading Division of Baxi Heating U.K. Ltd Brownedge Road Bamber Bridge Preston Lancashire PR5 6SN
www.baxipotterton.co.uk Comp N
o
5111037 – Iss 1 – 02 / 04
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