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36

 

- 

Installation & Servicing

FAULT FINDING

  FAUL

T FINDING FAUL

T FINDING FAUL

T FINDING FAUL

T FINDING FAUL

T FINDING FAUL

T FINDING

SAFETY

Refer to Frame 42 for essential guidance on safety when
carrying out fault finding.
The preliminary electrical system checks are the FIRST
electrical checks to be carried out during a fault finding
procedure.
On completion of any service/fault finding task which has
required the breaking and remaking of electrical connections
the following checks MUST be repeated:
a

Earth continuity

b

Polarity

c

Resistance to earth

BLANK DISPLAY

In the case of a blank display, check the following:
-

Check the ribbon cable is correctly fitted to the display
board.

-

Check that mains voltage is provided across terminals 19
and 20.
-

If no power available, check external fuse.

-

Check the ON/OFF switch is set to ON.

-

Check the fuse '2AF' mounted on the MBD.

-

Before replacing any blown fuses check for short circuits
on the 230V circuit, with particular attention given to the
wiring of external pumps or valves.  Loads in excess of 1A
per external pump/valve will blow the fuse '2AF'.

-

If power supply and fuses are OK, the MBD needs
changing.

WARNING.  The external fuse and fuse '2AF' are part of the
230V circuit.  Make sure the power is off before checking.

BOILER DOES NOT SATISFY CH REQUEST
-

Check the connections of all external controls are correct.

-

Check the condition of all wiring to external controls.

-

Check the CH pump and its wiring.

-

Check that the parameters are set correctly for the chosen
control method.

BOILER DOES NOT SATISFY DHW REQUEST
-

Check the tank sensor/thermostat and its wiring.

-

Check the 3-way valve/DHW pump and its wiring.

-

Check that the parameters are set correctly.

BURNER MODULE LOCKOUTS
Note. 

To carry out checks on individual burner modules, it is

advised that all external controls are switched to 'OFF' so no
heat demand is placed on the boiler.  Individual burners can
then be fired in TEST mode, see Frames 26 & 32.
When a burner module locks out, the corresponding red reset
button illuminates on the fascia.
Note. 

The blinking red LED on a CVI board indicates that it is

functioning correctly.
To reset the boiler, press and hold the illuminated red reset
buttons of each failed module and press the reset button on
the fascia.

45 FAULT FINDING

The air pressure switch does not close:
In this situation the fan runs for 60 seconds, then goes into
lockout, illuminating the relevant push button on the fascia.
-

Check the condition and connections of the silicon tubes to
the air pressure switch.

-

Measure the signal across the air pressure switch.  If
greater than 53 Pa replace the air pressure switch.  If less
than 53 Pa check the following:
-

Check for any blockages in the passage of air through
the boiler and then out through the flue.

-

Check that the flue has been sized correctly and does
not create excessive resistance (>100 Pa).

-

Check for dirt build up on the back of the burner skin
(see servicing section).

-

Check operation of fan.

High limit thermostat is open:
In this situation the module goes into lockout, and after
approximately 30 seconds the relevant push button on the
fascia becomes illuminated.
If the module has overheated:
-

Check for presence of water in the heat exchanger.

-

Check for adequate water circulation through the section.

If the module has not overheated:
-

Replace faulty overheat thermostat.

No flame is detected despite visible ignition through
sightglass:
-

Check the connection to the ionisation electrode.

-

Check for any distortion of the ionisation electrode, or
cracking of the ceramic.

-

Check that the resistance between the probe and earth is
not zero.

-

If all above OK, replace CVI board.

No ignition:
-

Check for a visible spark on the ignition electrode through
the sightglass.  If not visible, check condition of electrode
and wiring.  If all OK replace CVI board.

-

Check the gas valve opens correctly.  Due to the nature of
the gas valve a burner pressure is difficult to measure.
Therefore it is advised that a manometer is connected to
the gas valve inlet pressure test point.  When the gas valve
is energised a drop in pressure will be visible, if the valve
has opened correctly.  If this is not the case, remove the CVI
board from the gas valve and measure the gas valve
solenoid resistance values.  V1 should measure
approximately 2.9k 

Ω

, V2 should measure approximately

1.4k 

Ω

.  If measured values differ significantly from these,

replace the valve.  If values are OK replace CVI board.

-

If ignition electrode and gas valve are functioning correctly,
check the condition of burner.  Refer to service section on
how to clean burner, and replace if any signs of damage
are evident.

Detail of electrical connections on the 'CVI' control boards mounted directly onto the gas valves.

12

10

8

6

4

2

11

9

7

5

3

1

10K

5V

+

-

L

N

E. ACC.

E. RIV.

PR

LB

TL

PV

E. ACC.Ignition  electrode
E. RIV Ionisation  electrode
PR

Rest button (on fascia panel)

LB

Lockout warning light (within reset button)

TL

High limit thermostat (local)

PV

Fan air pressure switch

L - N

Supply terminals on CVI

1-2

Ionisation signal to MBD

WARNING!

To disconnect the 

ignition lead from the

CVI hold directly on 

the terminal (fast-on)

and not on the lead.

ima 5789

Содержание imax plus F120

Страница 1: ...D When replacing any part on this appliance use only spare parts that you can be assured conform to the safety and performance specification that we require Do not use reconditioned or copy parts that...

Страница 2: ...3 910 Btu ft3 nett at 15 C and 1013 25 mbar a For l s divide the gross heat input kW by the gross C V of the gas MJ m3 b For ft h3 divide the gross heat input Btu h by the gross C V of the gas Btu ft3...

Страница 3: ...g systems Fully pumped systems may be open vented or sealed The range of boilers is NOT suitable for 1 Gravity DHW systems 2 Gravity heating systems 3 Direct domestic hot water supply 4 Single feed in...

Страница 4: ...r conditioning If this should occur the appliance MUST be isolated from the gas supply labelled as unsafe until corrective action can be taken Terminal Position Due to the high efficiency of the boile...

Страница 5: ...rrent suitability should be confirmed directly with the manufacturer G E Betz Ltd Sentinal Division Foundry Lane Widnes Cheshire WA8 8UD Tel 0151 424 5351 or Fernox Manufacturing Co Ltd Cookson Electr...

Страница 6: ...GRAPH 1 WATER PRESSURE LOSS ima 5774 F80 F120 F160 20 C F 80 20 C F 120 11 C F160 11 C F 120 11 C F 80 20 C F 160 1300 1250 1200 1150 1100 1050 1000 950 900 850 800 750 700 650 600 550 500 450 400 350...

Страница 7: ...y are on the R H or on the L H side of the boiler see views on the left Flue connection shown on RH side options shown dotted at rear or left Model Modules No off A B Weight Connections ima 5773 The b...

Страница 8: ...ING CIRCUIT PRIMARY BOILER CIRCUIT ima 5790 The use of a mixing header means that compensating controls can be used to operate mixing valves on a variable temperature circuit without affecting the wat...

Страница 9: ...t 4 The boiler is at the highest point of circulation in the system Systems designed to rise above the boiler flow tappings will automatically require a minimum static head higher than that shown 5 Th...

Страница 10: ...alarms may be necessary Expansion vessels used must comply with BS 4814 and must be sized on the basis of the total system volume and initial charge pressure Initial minimum charge pressure should not...

Страница 11: ...TC Temperature Sensors 3 to 8 Overheat Thermostats 3 to 8 Burners 2 to 7 Aluminium Heat Exchanger 3 to 8 Sections Condensate Sump Flue Collector Box Boiler Frame Filling Up Elbow Min Depth 100 mm ima...

Страница 12: ...connections simply remove the blanking plates from the connection required and attach the flue air connections Seal off the unused connections with the removed blanking plates Note To enable cleaning...

Страница 13: ...IN A condensate drain for the boiler should be assembled as shown below This can be built using the parts provided plus other pieces not supplied The parts provided are 40mm plastic pipe All additiona...

Страница 14: ...rb the lip seal The flue should be supported in such a way as to not place a load on the flue manifold 14 ELECTRICAL CONNECTIONS Warning This appliance MUST be earthed A mains supply of 230V 50Hz is r...

Страница 15: ...hese terminals provide a 24V supply and return to be switched open closed circuit Open circuit enables the night time set back period If no night time set back period is required then a link wire shou...

Страница 16: ...e of providing the boiler with the actual stored DHW temperature allowing closer output matching and reduced cycling Use of a tank sensor kit cannot be timer controlled A diverting valve or a separate...

Страница 17: ...BROWN BLUE YEL GRE RED YEL GRE ORANGE RED BLUE BLUE GREEN GREEN WHITE RED BLUE BLACK BLUE BLACK BLUE BROWN FILTER GE FITELEC 1 YEL GREEN YEL GREEN YEL GREEN YEL GREEN CVI CONTROL MAIN SUPPLY 230 V 50...

Страница 18: ...ate required and the flow temperature required It can communicate directly with the CVI controls of 2 modules The AM 5 board is a supplementary board used with boilers containing more than 2 modules I...

Страница 19: ...F O N 1 2 O F F O N The Modular Boiler Drive MBD see Frame 20 for location manages to check a two burner group 2 x 40 80 kW For boilers with outputs greater than 80 kW 1 2 or 3 supplementary AM 5 boa...

Страница 20: ...rough a relay powers the 3 way valve thus closing port A and opening port B Simultaneously terminal 16 is energised which through another relay powers the primary system pump If PARA A 2nd digit is se...

Страница 21: ...Installed on the Secondary Circuit in Parallel with the Heating Circuit 1 2 4 3 5 76 ST O R E M O D E R ES ET ST EP 16 1718 11 12 13 ima 5783 Flow Return Filter Primary System Pump Mixing header non r...

Страница 22: ...n installer once he has entered the service code By pressing the mode key again DATA mode is displayed In this mode it is possible to read information on the operation of the boiler The following mode...

Страница 23: ...O R E M O D E R E S E T As above As above it selects parameters data all single test all single it chooses the mode It displays when in DATA mode It stores when in PARA mode it in creases or decreases...

Страница 24: ...sing mode S T E P S T O R E M O D E R E S E T it selects parameters data all single test all single it chooses the mod e It displays when in DATA mode It stores when in PARA mode it in creases or decr...

Страница 25: ...y 11 1 6 0 Maximum CH Flow Temperature Setpoint degC S T E P 30 90 80 3 8 0 Flow Temperature Minimum Design Setpoint degC Press Display Description Parameters accessible to trained installers and serv...

Страница 26: ...P E 2 0 Ignition fan speed of parameter C S T E P F 2 0 2nd Digit DHW type x0 3 way valve normally open to CH system x1 DHW pump x2 3 way valve normally open to DHW tank DO NOT ADJUST 58 DO NOT ADJUST...

Страница 27: ...ow temperature NTC1 C Local return temperature NTC2 C Module 4 fan speed set point rpm Module 4 actual fan speed rpm Local flow temperature NTC1 C Local return temperature NTC2 C Module 5 fan speed se...

Страница 28: ...emperature NTC2 C Module 6 fan speed set point rrpm xxxx Module 6 actual fan speed rpm xxxx Local flow temperature NTC1 C Local return temperature NTC2 C Module 7 fan speed set point rrpm xxxx Module...

Страница 29: ...burner module 3 Test mode low for burner module 3 Test mode off for burner module 4 Test mode high for burner module 4 Test mode low for burner module 4 S T E P A L L S T E P B U R 1 S T E P B U R 2 S...

Страница 30: ...nd closing the circuit connected across terminals 5 6 Without the outside sensor connected PARA 3 fixes the boiler set flow temperature If the outside sensor is connected automatic detection then the...

Страница 31: ...ws the building temperature to be dropped during periods e g night time The heating curve can be adjusted using the following parameters see also Frames 26 and 28 Parameter 3 Highest set flow temperat...

Страница 32: ...ON 4 Fill the condensate trap with water before putting the unit into operation see frame 11 for guidance 5 Check the indication on the pressure gauge sealed system installations If the pressure is l...

Страница 33: ...in a safe place for ready reference IMPORTANT Point out to the owner that the boiler must have regular maintenance and cleaning at least annually in order to ensure reliable and efficient operation Re...

Страница 34: ...it is checked at regular intervals and serviced as necessary The frequency of servicing will depend upon the installation condition and usage but should be carried out at least annually Caradon Ideal...

Страница 35: ...ssed air through the metal fibre side of the burner Do not brush the metal fibre side of the burner If they show any signs of damage they must be replaced 12 Inspect the heat exchanger some aluminium...

Страница 36: ...f the silicon tubes to the air pressure switch Measure the signal across the air pressure switch If greater than 53 Pa replace the air pressure switch If less than 53 Pa check the following Check for...

Страница 37: ...es are equivalent the code with the lowest first digit prevails in the case that the first digits are equivalent the code with the highest second digit prevails Error Code Description Alarm L1 2 Local...

Страница 38: ...ons The NTC and or wiring of the global temperature involved is defective Insufficient or even no circulation of water due to the obstruction of the sections or pump failure ERRORCODESRELATEDTOGLOBALT...

Страница 39: ...ir Vent 1 173 029 32 Global Flow Return Sensor T7335D1040 12K 2 173 038 32 Module Temperature Sensor 1 per Section T7335D1040 12K 5 to 8 173 038 1 Module Temperature O H Sensor 1 per Section T7335D104...

Страница 40: ...ent in the design and performance of its products The right is therefore reserved to vary specification without notice The Ideal Boilers Technical Training Centre offers a series of first class traini...

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