Mamiya C28, C32, C24 manual External Electrical Controls, Electrical Connections for a Combi Boiler

Page 28

INSTALLATION

INSTALLATION

33 EXTERNAL ELECTRICAL CONTROLS

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

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

The external fuse rating should be 3A.

Route the electrical supply flexible cord and the external control flexible cord as illustrated.

Lock the flexible cords in place with the clamps provided.

230V supply

ELECTRICAL CONNECTIONS FOR A COMBI BOILER

Optional Programmer Kits

Optional digital programmer kits are available with their relevant instructions.

Both 24hr and 7day kits are available.

thermostat should be wired into the system.

To maintain frost protection with the programmer selector switches set to OFF, all the controls MUST be left in the running position.

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

Wiring should be as shown, with minimal disturbance to other wiring.

External Programmers

On the combi boilers, this should be of the single channel type (as this boiler does not incorporate a pre---heat facility for the instantaneous hot water service).

Programmers with room thermostat --- see diagram B.

Note. lf the boiler is installed in a garage it may be necessary to fit a pipe thermostat, preferably on the return pipework.

Earths are not shown for clarity but must never be omitted.

A

Optional frost’stat

Room thermostat

 

 

 

 

 

 

 

 

L

N

 

T

T

 

 

 

 

 

 

Power supply

 

 

 

 

terminal block

 

 

2

1External controls

3terminal block

Note: the switch contacts of any external programmer, room or frost thermostat must be volt free. Connecting a switched live feed to external controls terminal block may be dangerous and will result in serious damage to the boiler.

Room Thermostat

This should be wired as shown in diagrams A.

Frost protection

Central heating systems fitted wholly inside the house do not normally require frost protection as the house acts as a ‘storage heater’ and can normally be left at least 24 hours without frost damage.

This appliance is provided with a built in anti---freeze system that operates the boiler when the temperature is below 5 ûC. Therefore, when the boiler is not lit and used in cold weather, with consequent risk of freezing do not isolate the boiler from the electricity supply or close the gas inlet cock.

B

External programmer

Optional frost’stat

T

Room thermostat

L N

T

Power supply terminal block

2 1

3

External controls

terminal block

 

However, 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

N.B. These diagrams are schematic only and do not show external terminal strips etc.

28

mini HE --- Installation & Servicing

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Image 28
Page 27 Page 29
Contents Installation and servicing Mini HE --- Installation & Servicing Document Amendments General Boiler DataPerformance Data --- Central Heating Domestic Hot WaterContents Benchmark Commissioning Checklist DetailsGeneral Boiler Water Connection Boiler ClearancesGAS Safety IntroductionOptional Extra Kits Safe HandlingFlue Installation Requirements GAS SupplySafe Handling of Substances Location of Boiler and Flue OutletWater Circulation System Water TreatmentAIR Supply Additional PumpsElectrical Supply RequirementsSize of expansion vessel Mini HE C24, mini HE C28Hydraulic Loss Remaining pump capacity General Boiler Control Interlocks Domestic HOT Water RequirementsGeneral Boiler Water Circuit Diagram Installation Installation Boiler AssemblyInstallation Unpacking Pack a contentsHardware pack contents Pack B contentsInstallation Fitting the Flue SystemRear Flue Assembly Refer to the following diagram for the model mini HE C32Twin Pipe Flue DuctWall Mounting Template rear flue Ring Installation Cutting the FlueFitting the Extension Kits Installation Fitting the Optional Roof Flue Roof Flue KIT CONTENTS/OPTIONSInstallation Flue Terminal Position Flue ArrangementAssembling the Roof Flue KIT Flue over 3 meters longInstallation Fitting the Wall Mounting Plate Fit the service valves, washers and tail pipes as shownMounting the Boiler ConnectionsSafety Valve Drain Condensate DrainLocate the gasket and flue turret on the top of the boiler Flues over 1 meter longIncoming mains wiring detail For external controls wiring see frameElectrical Connections Pictorial Wiring Installation Functional Flow Diagram Control pcbExternal Electrical Controls Electrical Connections for a Combi BoilerInstallation Initial Lighting Maximum valve setting To Adjust PressuresMinimum valve setting Anti Cycling Setting Commissioning and TestingElectrical Installation Gas InstallationGeneral Checks Installation GAS Conversion Handing OverServicing Servicing ScheduleServicing Removal of Outer and Inner Casing Servicing Burner Removal and Cleaning Cleaning the Heat ExchangerRE---ASSEMBLY Burner Pressure CheckServicing FAN and Venturi Removal and Cleaning Remove the fan by sliding it towards left see the arrowSpark and Detection Electrode Replacement Burner ReplacementBurner Injectors Replacement When replacing any componentServicing Overheat Thermostat Replacement Flue Temperature Probe ReplacementTemperature Probe Replacement Removal of CH temperature probeGAS Valve Replacement Expansion Vessel ReplacementVenturi Replacement Servicing FAN ReplacementAIR Pressure Switch Replacement Pump Replacement Complete Servicing Electronic CONTROL/IGNITION PCB Replacement Boiler mode setting Servicing CH Flow Switch Replacement CH Flow Switch Membrane ReplacementDHW Filter and Flow Limiter Replacement Servicing DHW Flow Switch ReplacementFlow limiter Servicing Primary Heat Exchanger Replacement Recuperator ReplacementServicing Diverter Valve Actuator Replacement Diverter Valve Internal Parts ReplacementServicing DHW Heat Exchanger Replacement CH Drain Cock ReplacementTo clean the condensate trap and drain Condensate Trap ReplacementTo replace the condensate trap Normal operation OFFFault Finding FindingFrom Fault finding Fault Finding Fault Refer back to page 52 of fault finding to continue Fault Finding From Burner mod. mini HE C28, mini HE C32 075535Fan mod. mini HE C28, mini HE C32 17398422 23 Installer Notification Guidelines GAS Boiler Commissioning Checklist Service Interval Record Technical Training Ideal boilersInstaller Water hot or Installer the contact fire not doesCorrectly Ignition at attempt Cleaning MaintenanceGAS of Escape Boiler the Light to Lights DiagnosticClearances Minimum

C28, C24, C32 specifications

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