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27

INsTaLLaTION

Indep Combi - 

Installation and Servicing

 

25   INTERNaL  WIRINg

 

26  ExTERNaL  ELECTRICaL  CONTROLs

Wiring External to the Boiler

The fuse rating should be 3A.

Wiring external to the boiler MUST be in accordance with the current I.E.E. 
(BS.7671) Wiring Regulations and any local regulations.

Frost protection

If parts of the pipework run outside the house or if the boiler will be left off for 
more than a day or so then a frost thermostat should be wired into the system.

The frost thermostat should be sited in a cold place but where it can sense heat 
from the system.

Note.

  If the boiler is installed in a garage it may be necessary to fit a pipe 

thermostat, preferably on the return pipework.

A mains cable must be connected to a permanent live supply and NOT switched by 
thermostats/programmers. To do so follow the instructions below:

1.  Remove the front panel.  Refer to Frame 34.

2.  Swing the control box down into the service position.  Refer to frame 40.

3.  Route cable through the cable clamp and grommet and tighten to provide cord anchorage.

4.  Connect the live, neutral and earth wires to the terminal strip.  When making the mains 

electrical connections to the boiler it is important that the wires are prepared in such a 
way that the earth conductor is longer than the current carrying conductors, such that if 
the cord anchorage should slip, the current carrying conductors become taut before the 
earthing conductor.

5.

  Swing the control box back up into the operating position and re-fit the front panel 

ensuring a good seal is made.

3G9989

N

L

N

FROST
STAT
(

OPTIONAL

)

ROOM
STAT/
TIMER

Room
Stat or
Prog.
Room
Stat

Optional

Frost Stat

Earths are not shown for clarity but must 

never be omitted.

24  ELECTRICaL  CONNECTIONs

Wiring should be 3 core PVC insulated cable, not less than 
0.75mm

2

 (24 x 0.2mm), and to BS 6500 Table 16. For IE 

reference should be made to the current ETCI rules for electrical 
installations.

Connection must be made in a way that allows complete isolation 
of the electrical supply such as a double pole switch having 
a 3mm (1/8”) contact separation in both poles. The means of 
isolation must be accessible to the user after installation.

Warning. This appliance  MUST be earthed.

A mains supply of 230Vac ~ 50 Hz is required. 

The fuse rating should be 3A.  All external controls and wiring 
must be suitable for mains voltage.  

Wiring external to the boiler MUST be in accordance with the 
current I.E.E. (BS.7671) Wiring Regulations and any local 
regulations.

The Indep Combi boiler comes pre-fitted with a link wire between 

the room thermostat/Timer connections on the terminal strip.  This creates a 
permanent call for heat and must be removed when adding a room thermostat.

ROOM ThERMOsT aT - WIRINg

1.  Remove link wire between Room stat/timer terminals.

2.  Connect room stat as shown in wiring diagram opposite.

3.  If room stat has a neutral connection, connect this to terminal N (load) in 

the fused spur.

FROsT ThERMOsT aT - WIRINg

If parts of the system are vulnerable to freezing or the programmer is likely to 

be left off during cold weather, a frost stat should be fitted in conjunction with a 

pipe thermostat.

1.  Position the frost thermostat in a suitable position, i.e. area vulnerable to 

freezing.

2.  Connect frost stat across terminals marked frost stat as shown in wiring 

diagram opposite.

3G9990

L

N

Room Stat

Frost Stat

Mains In

Use of general Live for Room stat

Room
Stat

Optional

Frost Stat

IN

s

T

a

LL

a

TION

Summary of Contents for INDEPENDENT C35

Page 1: ...STALLATION AND SERVICING Independent Combi C24 C30 C35 For details of document amendments refer to page 3 For users guide see reverse of book When replacing any part on this appliance use only spare p...

Page 2: ...nt Combi Installation and Servicing U n i t 3 A T h o r n t o n R o a d I n d E s t a t e O f f H o c k n e y R o a d B r a d f o r d B D 8 9 H Q 0 1 2 7 4 4 8 8 3 8 8 w w w h e a t i n g s p a r e s...

Page 3: ...he ideal installer helpline 01482 498704 NOTE BOILER RESET PROCEDURE To reset boiler turn mode knob to reset position and immediately turn knob back to required setting The boiler will repeat the igni...

Page 4: ...designed for connection via ducts to a horizontal or vertical terminal which admits fresh air to the burner and discharges the products of combustion to the outside through orifices which in this cas...

Page 5: ...back page Page Burner operating pressure n a Central heating flow temp measure and record Central heating return temp measure and record For combination boilers only Scale reducer 12 Hot water mode He...

Page 6: ...rise The DHW draw off rate specified above is the nominal that the boiler flow regulator will give Due to system variations and seasonal temperature fluctuations DHW flow rates temperature rise will v...

Page 7: ...invalidate the certification and the normal appliance warranty It could also infringe the Gas Safety Regulations and the above regulations SAFE HANDLING OF SUBST ANCES No asbestos mercury or CFCs are...

Page 8: ...n Spacing 1 Directly below above or alongside an opening window air vent or other ventilation opening 300mm 12 2 Below guttering drain pipes or soil pipes 25mm 1 BS5440 1 2008 75mm 3 3 Below eaves 25m...

Page 9: ...e minimum boiler heat output should be achieved using a room thermostat whilst other rooms are individually controlled by thermostatic radiator valves However if the system employs thermostatic radiat...

Page 10: ...less than the length of flue required the flue must be fitted from the outside Installation from inside ONLY b If a core boring tool is to be used inside the building the space in which the boiler is...

Page 11: ...e connection is only allowed if acceptable to the local water authority b Antifreeze fluid corrosion and scale inhibitor fluids suitable for use with boilers having aluminium heat exchangers may be us...

Page 12: ...s is maintained in accordance with the manufacturer s instructions 2 If the boiler is installed in an existing system any unsuitable additives MUST be removed by thorough cleansing BS 7593 2006 detail...

Page 13: ...CTOR ASSEMBLY 214 VENTURI 215 FAN 217 BURNER 218 GASKET BURNER 219 SUMP CLEAN OUT COVER 223 FLUE MANIFOLD 224 FLUE MANIFOLD TOP 227 CLAMP RETAINING FLUE TURRET 228 HOSE CONDENSATE INTERNAL 229 SIPHON...

Page 14: ...or non telescopic flue assembly for rear or side flue outlet in Pack B is suppled as a separate order Unpack and check the contents Pack A Contents A Boiler B Hardware Bag C Wall Mounting Plate D The...

Page 15: ...inal Wall Seal D Cutting Aid Note This flue system incorporates a removable flue outlet nose that utilises a push fit location system This enables the installation of deflector high level or balcony o...

Page 16: ...se damage or personal injury 1 Cut the flue hole preferably with a 5 core boring tool ensuring that the hole is square to the wall Both wall faces immediately around the cut hole should be flat 2 Dril...

Page 17: ...ith a screw cap seal and a lower air sample point with an air stopper seal Ensure all caps seals are in place Additional Termination Kits available for use with these B packs Flue Deflector Kit The re...

Page 18: ...0mm long B Pack Telescopic Cut 75mm Minimum Maximum Minimum Maximum Minimum Maximum Minimum Maximum B Pack Standard 171 556 286 484 601 816 526 741 Plus 1 1m D pack 1121 1506 1236 1434 1551 1766 1476...

Page 19: ...holes in the outer flue section into the inserted outer flue as shown Take care not to pierce the inner plastic flue Fit screw provided 5 Seal the joint on the outer air duct with the tape provided 6...

Page 20: ...tted 7 Ensure the seam and the outlet terminal are at the top and fitted as shown Note If less than 50 of the length of the flue is internal the flue should be fitted from outside Fitting the Turret 1...

Page 21: ...cessories Flue Duct Extension Kits are available for flue lengths extending beyond 1m These packs contain 1m extension ducts and may be cut to the desired length If the offset vertical option is used...

Page 22: ...nal Position Minimum Dimension Directly below an opening air brick windows etc 300 mm Below plastic painted gutters 300 mm Painted surface 300 mm Below eaves or balcony 500 mm Below velux windows 2000...

Page 23: ...ure the vertical connector by applying downward pressure on the connector 4 Position the clamp on the top face of the flue manifold and push it horizontally backwards Locate both clamp lugs into the f...

Page 24: ...only be considered after exhausting all internal termination options as described previously An external system must terminate at a suitable foul water discharge point or purpose designed soak away If...

Page 25: ...ensate trap Min 19mm Internal pipe Min 30mm Internal pipe Water weather proof insulation 75 Boilers without 75mm sealed condensate trap must be fitted with a 75mm trap and visible air break Visible ai...

Page 26: ...not create a hazard to the occupants of the premises or damage the electrical components and wiring FILLING Important when filling A Ensure the dust cap on air vent located at the rear of the pump cha...

Page 27: ...ed 24 electrical connections Wiring should be 3 core PVC insulated cable not less than 0 75mm2 24 x 0 2mm and to BS 6500 Table 16 For IE reference should be made to the current ETCI rules for electric...

Page 28: ...3 5 4 1 2 3 1 2 1 2 1 2 3 4 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 Water Pressure Sensor Water Flow Turbine Fan Flow Thermistor Return Thermistor Flame Sensor Electrode Spark Electrode Spark Generator p...

Page 29: ...aving checked That the boiler has been installed in accordance with these instructions The integrity of the flue system and the flue seals as described in the Flue Installation section Proceed to put...

Page 30: ...turned off 2 Refit the boiler front panel Refer to Frame 34 3 Check that the drain cock is closed and that the CH and DHW isolating valves M L and G are OPEN 4 Check that the electrical supply is OFF...

Page 31: ...should read neon flashing then neon steady when the burner lights 2 Close all taps except the furthest one from the boiler and check that the boiler is firing at maximum rate This is factory set to gi...

Page 32: ...economy consistent with the household requirements of both heating and hot water consumption Advise the User of the precautions necessary to prevent damage to the system and to the building in the eve...

Page 33: ...carried out in sequence Important 6 After completing the servicing or exchange of components always test for gas tightness 7 When work is complete the front panel MUST be correctly refitted ensuring...

Page 34: ...f necessary 1 2 3 5 Injector REMOVAL 1 Loosen the two screws retaining the front panel 2 Pull the two spring clips down to disengage and pull panel forward and upward and remove REPLACEMENT 3 Hook the...

Page 35: ...t the burner is not placed down upon its face as this may cause damage to the ceramic 6 Brush off any deposits that may be on the ceramic with a SOFT brush 7 Inspect the sealing gasket around the burn...

Page 36: ...on Electrode Flame Detection Reassemble the boiler in the following order 1 Ensure that the condensate trap siphon is full of water 2 Refit the burner ensuring the sealing gasket is correctly position...

Page 37: ...onnect the electrical leads from the fan 3 Undo the gas pipe union connection to the injector housing 4 Remove the extended nut retaining the fan mounting bracket 5 Lift and remove the fan and venturi...

Page 38: ...ration of the boiler Refer to Frames 29 30 2 4 3 6 43 burner REPLACEMENT 5 5 6 1 See Frame 39 2 Refer to Frame 40 3 Undo the two screws and remove the sump cover 4 Lift the manifold to clear the botto...

Page 39: ...30 44 return thermistor reNEW AL 1 Refer to Frame 40 2 Unclip the return thermistor from the return pipe and withdraw it from the boiler 3 Disconnect the electrical lead from the thermistor 4 Reconne...

Page 40: ...r to Frames 29 30 Flame Detection Electrode Spark Generator 12 5mm Straight edge 1 Refer to Frame 40 2 Remove the burner Refer to Frame 43 3 Unplug the flame detection lead from the electrode 4 Remove...

Page 41: ...the two sealing washers are in place and reconnect gas and electrical connections 7 Check operation of the boiler Refer to Frames 29 30 49 diverter valve actua tor replacement 1 Refer to Frame 40 2 R...

Page 42: ...te Boiler Chip Card BCC to it this should correspond to the output of the boiler 24kW 30kW or 35kW Note Ensure the correct orientation of BCC by placing TOP side up as shown 8 Re connect all plug conn...

Page 43: ...o be in vertical position PCB 4 1 Remove the boiler front panel Refer to Frame 34 2 Pull out the plate with timer attached 3 Disconnect 5 way connector 4 Remove programmer and fit new programmer 5 Re...

Page 44: ...essurise as appropriate 5 Check operation of the boiler Refer to Frames 29 30 CENTRAL HEA TING CIRCUIT 1 Refer to Frame 40 2 Close all the CH water isolating valves on the boiler inlet 3 To drain the...

Page 45: ...r and remove pipe Refer to Frame 57 5 The automatic air vent head is retained in the pump body with a bayonet connection The air vent head and float assembly is removed by turning the head anti clockw...

Page 46: ...ock clear of the boiler 8 Unscrew the rear cartridge connection 9 Fit the new valve mechanism ensuring the correct fit of the pin 10 Reassemble in reverse order 11 Refill the boiler 12 Check operation...

Page 47: ...iler Refer to Frames 29 30 6 4 64 DHW Filter DHW Flow Regula tor Cleaning Replacement DHW Filter 1 Refer to Frame 40 2 Isolate the mains cold water supply to the boiler 3 Drain the boiler DHW circuit...

Page 48: ...8 8 Remove the expansion vessel Refer to Frame 67 9 Remove the flow thermistor Refer to Frame 65 10 Remove the 2 M5 screws retaining the gas valve mounting bracket and transfer bracket to the new heat...

Page 49: ...k pressure to 0 75 bar 4 Re assemble in reverse order 5 Check operation of the boiler Refer to Frames 29 30 REPLACEMENT 6 Refer to Frame 40 7 Drain the boiler CH circuit Refer to Frame 55 8 Unscrew th...

Page 50: ...associated harness for continuity visual condition and position Refer to Frame 45 Are these functioning correctly NO Check siphon and condensate drain pipe work for blockage and rectify if necessary...

Page 51: ...integrity of internal boiler wiring RESET PROCEDURE To reset boiler turn mode knob to reset position and immediately turn knob back to required setting 71 aLTERNA TING L AND 5 5 resets within 15 mins...

Page 52: ...ectly yes Check siphon and condensate drain pipe work for blockage and rectify if necessary Boiler now working OK Check wiring from gas valve to PCB for continuity If the wiring is OK then replace the...

Page 53: ...wires to the outside sensor Check the resistance using a suitable multimeter connected across the Outside Sensor s terminal pins At 0 o C expect 31 000 35 000 Ohms At 15 o C expect 15 000 16 500 Ohms...

Page 54: ...the Flow Thermistor no 79 aLTERNA TING F AND 9 PCB Fault Replace PCB Ensure that the BCC boiler chip card small plastic part is fitted to the PCB otherwise replace PCB 81 aLTERNA TING c AND 2 BCC faul...

Page 55: ...ion yes no Move the mode knob to the Winter position Are the Timer and the Room Thermostat switched on yes no Switch the Timer and Room Thermostat On Are the Radiator Valves Open yes no Open the Radia...

Page 56: ...ame 2 Is the wiring between the PCB and the diverter valve motor connected yes yes Check diverter head fully engaged and clip secured onto waterset yes Is diverter stuck in the CH position yes Check a...

Page 57: ...ehensive spares parts information and details of approved Ideal Parts Distributors are available on www idealparts com Our Parts team are also available to help with your Ideal Spare Parts enquiries o...

Page 58: ...nt Combi Installation and Servicing U n i t 3 A T h o r n t o n R o a d I n d E s t a t e O f f H o c k n e y R o a d B r a d f o r d B D 8 9 H Q 0 1 2 7 4 4 8 8 3 8 8 w w w h e a t i n g s p a r e s...

Page 59: ...guarantee the boiler needs to be registered with the manufacturer within one month of the installation To maintain the boiler guarantee it is essential that the boiler is serviced annually by a Gas S...

Page 60: ...as BOILER sysTEM COMMIssIONINg ChECKLIsT CONTROLs Programmable room thermostat Optimum start control Combination Boiler Fitted Fitted Fitted Automatic bypass to system Fitted Boiler interlock aLL sysT...

Page 61: ...VICE RECORD sERVICE 01 aND Where Possible aND Signature sERVICE 02 aND Where Possible aND Signature sERVICE 03 aND Where Possible aND Signature sERVICE 04 aND Where Possible aND Signature sERVICE 05 a...

Page 62: ...the correct type as specified by BS 7967 Prior to its use the ECGA should have been maintained and calibrated as specified by the manufacturer The installer must have the relevant competence for use o...

Page 63: ...that no seals e g Those on flue extensions have been displaced during installation Rectify if necessary Turn off appliance and call Ideal Technical helpline for advice The appliance must not be commi...

Page 64: ...domestic commercial and industrial heating installers engineers and system specifiers For details of courses please ring 01482 498 432 Manufactured under an ISO 9001 registered quality management sys...

Page 65: ...and performance specification that we require Do not use reconditioned or copy parts that have not been clearly authorised by Ideal For installation guide see reverse of book U n i t 3 A T h o r n t o...

Page 66: ...bove regulations In IE the installation must be carried out by a Registered Gas Installer RGII and installed in accordance with the current edition of I S 813 Domestic Gas Installations the current Bu...

Page 67: ...to a maximum of 80o C adjustable via the CH temperature control C The Independent Combi is a high efficiency combination boiler which is most efficient when operating in condensing mode The boiler wil...

Page 68: ...rom a watering can or similar DO NOT use boiling water 3 Caution when using warm water as this may freeze and cause other localised hazards 4 Once the blockage is removed and the condensate can flow f...

Page 69: ...ING SWITCHING TIMES Set tappets to outer edge for ON periods and set tappets to inner edge for OFF periods The example shown has been set with 2 on periods ON at 9 00am OFF at 1 00pm 13 hours ON at 6...

Page 70: ...and adjust if necessary Check the timer is in an ON position and the room thermostat is turned up NO HOT WATER OR CENTRAL HEA TING Check the fused spur is turned on and ensure switch mode control knob...

Page 71: ...e boiler has a call for hot water but the appliance has reached the desired temperature set on the boiler The boiler is operating in central heating mode The boiler is operating in pre heat mode The b...

Page 72: ...sure gauge If the boiler fails to operate then please contact Ideal if under warranty or alternatively a Gas Safe Registered Engineer if outside of the warranty period In IE contact a Registered Gas I...

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