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Keston K170, Инструкции по установке и обслуживанию

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5. FAULT  FINDING

5.1

ELECTRICAL CONTROL SEQUENCE

When the external controls are calling for heat, power will be fed to the boiler connection
strip at terminals L (Live) and N (Neutral). If the ON/OFF switch is also in the ON position
the boiler ON lamp (amber) will be illuminated. Provided all temperature thermostats and
pressure switches are closed, power will be fed to pins 1 & 2 on the control box, initiating
the following sequence.

(1)

The boiler lockout lamp (red) will be illuminated

(2)

The fan will start.

(3)

When the fan reaches running speed, the Air Pressure switch, normally open, will
close which will start the ignition sequence.

(4)

After a pre-purge period of about 15 seconds, the gas valve will open to allow gas
to mix with the air at the suction side of the fan and the ignition spark will occur at
the main burner.

(5)

When the burner ignites, the flame is detected by the control box through the
combined flame sensor/ignitor and the ignition spark is stopped. Both the lockout
lamp (red) and the boiler run lamp (green), the upper lamp adjacent to the flame
symbol, will be illuminated. The boiler is now in its normal run condition.

(6)

The burner will continue to operate until the gas valve interrupts the gas supply.
The gas valve will be closed by the control box if power is interrupted to the boiler
by any external control or the boiler thermostat. If an interruption to the gas supply
causes loss of the flame, the control box will pause for approximately 10 seconds
and then attempt to re-ignite the unit. If this attempt fails, i.e. due to continued
lack of gas supply, the boiler will make two further attempts to ignite at intervals of
approximately 1 minute and will then go to a lockout state (red lamp illuminated
only). Once the gas supply has been resumed the boiler can be reset by turning
the boiler off and then on again on the boiler control panel.

(7)

The boiler can also be shut down by any of the flow limit, flow overheat and the
flue overheat thermostats, gas low pressure switch and by the low water pressure
switch.

In such an event the green (run) lamp, the upper lamp adjacent to the flame
symbol, will be extinguished and only the red (lockout) lamp will be illuminated.

Any failure of the boiler to sequence in the above manner should be investigated using the
following trouble shooting flow diagram.

Before attempting any electrical fault finding, always carry out preliminary electrical system
checks. On completion of any service/fault finding task which has required the breaking
and remaking of electrical connections, the checks, earth continuity, polarity, short circuit,
resistance to earth must be repeated.

WD51/2/1997   Chapter 5 : Fault Finding

The Keston 170 Condensing Boiler

Installation & Servicing Instructions

Page  :  25

Содержание K170

Страница 1: ...ation And Servicing Instructions Keston 170 GC No 41 930 04 CE No 87AR50 These instructions must be left either with the user or next to the site gas meter 34 West Common Road Hayes Bromley Kent BR2 7...

Страница 2: ...ge 2 12 Radiant Floor Heating 2 13 Low Water Volume Boiler vs Cast Iron Boiler 2 14 Determine Radiation Needed Room By Room 3 INSTALLATION OF THE BOILER 3 1 Wall Mounting Bracket 3 2 Mounting The Boil...

Страница 3: ...fice 8 SPARE PARTS LISTINGS BENCHMARK INITIATIVE As part of the industry wide Benchmark Initiative all Keston 170 boilers now include a Benchmark Installation Commissioning and Service Record Log Book...

Страница 4: ...istics of the boiler coil must be taken into consideration when calculating the pump size The Keston boiler is not a high water content boiler and does not contain the metal mass or water volume of a...

Страница 5: ...ature of the flue gases are usually around 10o C above the temperature of the return water The flue pipe should be terminated outside the building from where they cannot re enter the building or any o...

Страница 6: ...er kW 54 5 50o C Flow 30o C Return Btu h 186 000 Burner Setting Pressure mbar 10 0 Hot in wg 3 94 Gas Comsumption After l s 1 42 10 mins Running Ft3 hr 180 73 CV of Gas 38 7 MJ m3 1038 Btu Ft3 Max Ope...

Страница 7: ...s of the current IEE Wiring Regulations and in Scotland the electrical provisions of the Building Regulations applicable in Scotland with respect to the installation of the boiler in a room or interna...

Страница 8: ...let NB Refer to Section 2 8 3 The Keston can be located virtually anywhere desired provided that all regulations are complied with Because of the boiler s compact size and venting flexibility the inst...

Страница 9: ...he service pipe by the local gas region or their contractor An existing meter should be checked preferably by the gas region to ensure that the meter is adequate to deal with the rate of gas supply re...

Страница 10: ...ry threaded or compression fittings Pipes should have a gradient to ensure air is passed easily to vent points and water flows readily to drain points j Draining taps must be located in accessible pos...

Страница 11: ...449 and BS 7074 Pt 1 The vessel must be positioned on the inlet to the pump iii A filling point in accordance with local water authority requirements iv A method of system make up automatic or manual...

Страница 12: ...g Insufficient water flows through the boiler will cause the boiler to kettle or even produce steam which can damage the heat exchanger and will invalidate the heat exchanger warranty It is normally...

Страница 13: ...e to debris abrasion within the system 2 7 7 Pump Selection The Keston boilers have low water content heat exchangers with a high resistance to flow when compared with cast iron heat exchanger boilers...

Страница 14: ...ed and are illustrated in Figure 2 8 1 above 2 8 2 Maximum Lengths The maximum lengths of both air inlet pipe and flue outlet pipe when no bends are used are as detailed below Maximum Air Inlet Length...

Страница 15: ...ections in excess of 2m These additional condensate drains must be run to discharge as detailed in section 2 11 Such drain points can be formed using standard muPVC fittings Refer to the example in Fi...

Страница 16: ...2 8 5 Clearances From Wall Flue outlet and air inlet terminations must be at least 60 mm and 95 mm respectively from the wall face 2 8 6 Distance Between Flue Outlet Air Inlet There is no maximum the...

Страница 17: ...s outside the property must be at least 32 mm inside diameter 2 12 RADIANT FLOOR HEATING The low operating temperatures of this type of system lead to very good operating efficiencies In fact under fl...

Страница 18: ...the boiler or short cycling will occur Likewise pumping rates of water through low water volume boilers must be maintained so that water is moved through the boiler fast enough so as not to reach boi...

Страница 19: ...ing screws of an appropriate size for the wall type No 12 x 2 inch wood screws normally suffice f Mark the bottom fixing hole and drill for a No 8 x 1 inch wood screw Insert plug 3 2 MOUNTING THE BOIL...

Страница 20: ...enter the appliance or the plastic pipework b Drill the two holes in the wall ceiling preferably using a core drill 3 4 1 Diameter of holes i Allowance must be made for socketed lengths if these are...

Страница 21: ...pipework f From outside complete the two terminations See Section 2 8 Flue System and make good all holes g Support any pipes whose route could be displaced either of its own accord or by accident Any...

Страница 22: ...ttom right of the cabinet 1 The electrical supply must be as specified in Chapter 2 Section 2 4 Electrical Supply WARNING THIS APPLIANCE MUST BE EARTHED 2 All external controls and wiring must be suit...

Страница 23: ...complete gas installation up to the boiler service cock must be checked for soundness BS 6891 Electrical Installation Carry out preliminary electrical safety checks i e Earth continuity Polarity Resis...

Страница 24: ...n 2 7 Water Systems At this stage for sealed systems fill to a pressure of about 2 7 bar d Check the complete system for water soundness If leaks need to be rectified using flux and solder the system...

Страница 25: ...gests that there is a possible restriction in the flue outlet pipework Note the exact reading h Turn the gas service cock to ON i Turn off the electricity supply wait 10 seconds and turn back on The b...

Страница 26: ...t cap to cover the burner pressure adjustment screw 4 8 TIMING THE GAS METER NATURAL GAS After the boiler has been started and with no other appliances using gas time the gas meter to be certain that...

Страница 27: ...is present for proper and complete combustion 4 10 HANDING OVER TO THE USER It is important to fully explain the following a Procedure to light and turn off the boiler including isolation of the elect...

Страница 28: ...r is interrupted to the boiler by any external control or the boiler thermostat If an interruption to the gas supply causes loss of the flame the control box will pause for approximately 10 seconds an...

Страница 29: ...uck in the NO position Is there 230V between control box pins 6 neutral Is there continuity between live supply from relay to blower Neutral through motor resistance Is the fan running Is motor overlo...

Страница 30: ...than 4 in water Is the air filter dirty or the air inlet exhaust or condensate pipe blocked Is the Burner blocked Fan faulty change Is the gas flow rate to the boiler correct for the gas type in use i...

Страница 31: ...alve Replace Faulty Gas Low Pressure Switch Replace Is there a spark present Is the HT voltage present at top of ignition electrode Is the spark gap 4 mm Faulty Conrtrol Box Replace Replace Adjust Spa...

Страница 32: ...n therm ostat both term inals Check external controls Faulty sw itch Replace Thermostat tripped reset OR faulty therm ostat Replace High cabinet tem perature check all joints for products leakage Repl...

Страница 33: ...FUNCTIONAL FLOW WIRING DIAGRAM WD51 2 1997 Chapter 5 Fault FindingThe Keston 170 Condensing Boiler Installation Servicing Instructions Page 30 N EMC Filter 2 5 10 8 1 4 6 EMC Filter SL PL Pump L Pump...

Страница 34: ...FLOW HIGH LIMIT THERMOSTAT FLOW OVERHEAT THERMOSTAT APS GAS VALVE HV BOILER THERMOSTAT THERMAL FUSE EMC GAS LOW PRESSURE SWITCH m p RED LAMP no nc N 13 14 15 1 2 3 4 6 7 8 N L LEGEND Y G GREEN YELLOW...

Страница 35: ...t Air Pressure Switch Gas Valve Flue Overheat Stat Ignition Electrode Low Water Pressure Switch Gas Low Pressure Switch Relay Blower 7W 51PK 52BK 93OR 92OR 11W 55BR 10BK G Y 8W W 6BR 5BR N SL 53W 54G...

Страница 36: ...7 17 4 10 00 0 HARNESS PACTROL RAM 144 SUPRESSOR FILTER MAINS 04 4 02 00 0 SECTION 1 13 13 8 SECTION 1 RELAY SOCKET 17 4 04 00 0 RELAY 17 4 03 00 0 RELAY CLAMP 17 4 00 02 0 124 123 105 125 17 4 00 01...

Страница 37: ...45 17 2 04 00 0 BURNER LABEL 04 2 00 58 0 HIGH VOLTAGE 44 17 2 03 00 1 43 HEAT EXCHANGER INSULATION 17 2 01 00 2 HEAT EXCHANGER 42 04 2 17 00 0 THERMOSTAT WATER RETURN 63 TRAP HOSE CONDENSATE 04 2 00...

Страница 38: ...SKET 102 GASKET 104 17 2 00 05 0 17 3 02 00 0 79 CAPACITOR BLOWER 78 17 3 01 00 0 80 04 3 04 00 0 BLOWER RUBBER ISOLATOR 1 SECTION 1 AIR HOSE CLAMP 17 3 00 07 0 92 17 3 00 02 0 AIR INLET FLEX CONNECTO...

Страница 39: ...0 60 0 FLAME LABEL 14 DEVICE BOX 17 1 00 19 0 3 10 17 1 00 29 1 SWITCH FIXING NUT 17 1 00 32 0 62 35 04 1 16 00 0 WIRE RETAINER ELECTRIC MAIN 66 04 1 00 75 0 PLASTIC PLUG 22 04 1 00 49 0 22mm GROMMET...

Страница 40: ...ap 375 530 63 Boiler Thermostat 375 532 67 Flue Overheat Thermostat 114 043 69 Combustion Test Plug 375 533 71 Flow Overheat Thermostat 375 534 72 Flow High Limit Thermostat 114 045 73 Water Pressure...

Страница 41: ...for leakage of gas gas air or combustion products d Check for condensate leaks e Check the colour and appearance of the flame A sky blue flame slightly off the burner gauze is normal The burner itsel...

Страница 42: ...rty remove the dirt with a vacuum cleaner or by other means If in any doubt renew the filter element b Remove the burner head Section 7 7 and inspect the burner appearance Black markings or other disc...

Страница 43: ...air supply joint is air tight h Turn on the electrical supply to the boiler and allow the boiler to reach operating temperature levels i Visually inspect the burner through the glass spy hole at the b...

Страница 44: ...IGNITION CONTROL BOX 7 4 7 AIR PRESSURE SWITCH 7 4 8 COMBUSTION BLOWER 7 4 9 GAS CONTROL VALVE 7 4 10 GAS LOW PRESSURE SWITCH 7 5 GAS ORIFICE 7 6 SPARK IGNITION FLAME DETECTION ELECTRODE 7 7 BURNER HE...

Страница 45: ...ng This is secured by three press studs on either side and a central press stud at the bottom of the control panel 7 3 REPLACEMENT PROCEDURES i Always replace in the reverse order unless otherwise sta...

Страница 46: ...O ring between thermostat and flue pipe If this is damaged on removal it must be replaced vi Reassemble Section 7 3 NB When fitting the new thermostat it is an advantage to smear a thin film of heat...

Страница 47: ...the cabinet vi Reassemble Section 7 3 NB When reassembling inspect any gaskets for damage and replace if necessary vii Reset the gas rate See Section 4 Commissioning 7 4 9 Gas Control Valve Fig 5 7 3...

Страница 48: ...e and replace if necessary With the new spark ignition electrode in place it is essential to ensure the gap between the tip of the electrode and the burner surface is 4 mm Distance above or below 4 mm...

Страница 49: ...changer to its mounting bracket xviii Remove the heat exchanger with pipework attached xix Remove the flow return and flue pipework from the heat exchanger Replacement heat exchangers are supplied wit...

Страница 50: ...ner head iv Reassemble Section 7 3 7 13 HT IGNITION LEAD Fig 5 7 1 item 122 i Isolate the appliance Section 7 1 ii Gain access Section 7 2 iii Remove the lead from the electrode and the ignition contr...

Страница 51: ...nifold Gasket 49 375 527Ignitor Gasket 50 114 120Ignitor Sensor Probe 55 114 122Flexible Hose Gasket 63 375 530Boiler Thermostat 67 375 532Flue Thermostat 71 375 533Flow Overheat Thermostat 72 375 534...

Страница 52: ...utlet Gasket 104 114 122Flexible Hose Gasket 91 375 536Gas Valve 106 E01 074 Ignition Control Box 109 170 084Air Pressure Switch 122 E01 075 HT Ignition Cable WD51 2 1997 Chapter 8 Spare Parts Listing...

Страница 53: ...Flexible Hose Gasket 63 375 530 Boiler Thermostat 67 375 532 Flue Thermostat 71 375 533 Flow Overheat Thermostat 72 375 534 Flow High Limit Thermostat 90 114 139 Gas Valve Gasket 91 375 536 Gas Multif...

Страница 54: ...ensure that no damage is done to the internal pipework Ensure that the 22mm condensate pipe is not exposed to freezing conditions Make sure that the exhaust pipe terminates away from windows or vents...

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