Vaillant ecoTEC plus 937 Instructions For Installation And Servicing
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Vaillant ecoTEC plus 937 Instructions For Installation And Servicing

Wall hung room sealed fan assisted condensing boiler with 15 litre shift load power store
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For the heating engineer
Instructions for installation and servicing

ecoTEC plus 937

Wall hung room sealed fan assisted condensing boiler
VUI
with 15 litre shift load power store
GB
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Summary of Contents for Vaillant ecoTEC plus 937

  • Page 1: Ecotec Plus

    For the heating engineer Instructions for installation and servicing ecoTEC plus 937 Wall hung room sealed fan assisted condensing boiler with 15 litre shift load power store...

  • Page 2: Table Of Contents

    3.10.7 Shift load storage tank expansion vessel ..17 system ..............35 3.11 Details for the pumps ..........17 5.4.2 Filling device for ecoTEC plus 937 ....36 3.11.1 Circulation pump ............17 5.4.3 Initial filling of the heating system ....36 3.11.2 Shift load storage tank circulation pump ..17 Initial flushing of the system ("cold“) ....37...
  • Page 3 Replacing the primary heat exchanger ..60 Replacing the expansion vessel of the shift load storage tank ......... 61 Replacing the storage tank pump of the shift load storage tank ......... 61 Replacing the aqua sensor ........ 62 ecoTEC plus 937 installation and maintenance manual...

  • Page 4: Introduction

    Guarantee card with return envelope No. 802922 General notes For the heating engineer: The ecoTEC plus 937 is designed for use in a closed Installation manual for flue central heating system and is comprehensively tested in accessories No. 834449 the factory.

  • Page 5: Ce Label

    The units comply with the following standards: – EN 483 – EN 625 – EN 677 – EN 50165 – EN 55014 – EN 60335-1 – EN 60529 – EN 61000-3-2 – EN 61000-3-3 ecoTEC plus 937 installation and maintenance manual...

  • Page 6: Unit Description, Data And Dimensions

    Main PCB fuse (slow-blow) for main power supply Electr. Power consumption Standby power consumption Shift load power store capacity Installation weight, just storage tank Installation weight, just combi unit Operating weight (with water) Table 2.1 Technical Data ecoTEC plus 937 ecoTEC plus 937 installation and maintenance manual...

  • Page 7: Dimensions

    8 Flue hole - flue system 80/125 9 Flue duct connection 10 Condensate drain connection, Ø 19 mm 11 Heating system pressure relief valve connection, 15 mm 12 Shift load storage tank pressure relief connection (flexible hose supplied) ecoTEC plus 937 installation and maintenance manual...
  • Page 8 3 Gas connection Ø 22 mm 4 Hot water connection, Ø 15 mm 5 Heating flow pipe, Ø 22 mm 6 Hanging bracket 7 Shift load storage tank pressure relief connection (flexible hose supplied) 8 Cover ecoTEC plus 937 installation and maintenance manual...

  • Page 9: Structure And Functional Elements

    3 storage charging pump 4 NTC temperature sensor - hot water outlet 5 Storage tank pressure relief valve Identification plates The identification plate of the ecoTEC plus 937 is located on the underside of the unit. Fig. 2.3 Function elements combi unit Key:...

  • Page 10: Functional Description

    8 Automatic air vent a Storage tank sensor 9 Pump b Infeed sensor SWT 10 Pressure relief valve c Storage tank charging sensor 11 Diverter valve 12 Gas valve 13 Fan 14 Compact thermal module ecoTEC plus 937 installation and maintenance manual...

  • Page 11: General Requirements 3

    Part 3 Installation, commissioning and maintenance. BS 4814: Specification for: Expansion vessels using an The ecoTEC plus 937 is be supplied for natural gas and internal diaphragm, for sealed hot water heating can be converted for propane gas with a conversion kit.

  • Page 12: Scope Of Supply And Accessories

    BS 7671 (IEE Regulations), the electro- technical stipulations of the Building Standards (Scotland) Regulations and, in IE, the current issue of IS 813 and the current ETCI Stipulations must especially be observed. ecoTEC plus 937 installation and maintenance manual...

  • Page 13: Gas Supply

    BS 5546 and in BS 6798. to guarantee that the combustion air supply is free from The ecoTEC plus 937 must be mounted on a flat, vertical the afore mentioned substances. wall which is sufficiently strong to hold the weight of the shift load storage tank and the combi boiler.

  • Page 14: Optional 125 Mm Flue Pipe

    600 mm of an opening window, air vent or any other ventilation opening. Fig. 3.4 Item No. 303 209 The flue pipe must be fitted, or shielded, in such a way that ignition or damage to sections of the building are avoided. ecoTEC plus 937 installation and maintenance manual...

  • Page 15: Air Supply

    However in order to ensure that the condensate plume doe not affect adjacent surfaces a clearance of 300mm is preferred. For IE, recommendations are given in the current edition of IS813. ecoTEC plus 937 installation and maintenance manual...

  • Page 16: System Requirements

    3.10.3 Pressure relief valve The boiler is equipped with a pressure relief valve. This Table 3.3 Size of an additional expansion vessel safety device is required for all sealed central heating ecoTEC plus 937 installation and maintenance manual...

  • Page 17: Shift Load Storage Tank Expansion Vessel

    3.14 Condensate siphonic trap The boiler is fitted with a siphonic condensate trap incorpaorating a water seal of 145 mm. ecoTEC plus 937 installation and maintenance manual...

  • Page 18: Sequence Of Operations During Installation

    Unpacking of appliance from carton. forwards to facilitate secure grip. Recommend 2 persons unpack appliance from carton. • Ensure safe lifting techniques are used – keep back Always keep working area clear. straight – bend using legs. ecoTEC plus 937 installation and maintenance manual...
  • Page 19 • Always use assistance if required. the area to take into account access, stability of flooring, lighting and other factors, and appropriate measures taken. ecoTEC plus 937 installation and maintenance manual...

  • Page 20: Required Minimum Gaps/Assembly Clearances

    – all the required pipework including the pressure relief valve and the condensate drain can be fitted. ecoTEC plus 937 installation and maintenance manual...

  • Page 21: Flue Exit

    If the appliance is to be fitted in a timber framed building ensure that the hanging bracket is secured to a substantial part of the timber frame capable of taking the full weight of the appliance. ecoTEC plus 937 installation and maintenance manual...

  • Page 22: Mounting The Combination Boiler

    The heating system is fitted with an expansion tank (10 l/0.75 bar). • Before connecting the unit, make sure that this volume is adequate. Otherwise the installation must be fitted with an additional expansion vessel (see Section 3.11.6). ecoTEC plus 937 installation and maintenance manual...

  • Page 23: Gas Connection

    • Push the gas connection pipe elbow (2) into the gas isolation valve (1) up to the stop. • Pull the union nut (6) with the olive (5) towards the gas isolation valve. Tighten the union nut hand tight. ecoTEC plus 937 installation and maintenance manual...

  • Page 24: Cold Water Supply And Hot Water Outlet

    • Insert the copper tail into the cold water isolating combi boiler all pipework and radiators must be valve up to the stop. Tighten the union nuts in this thoroughly flushed out to remove all position. contaminants. ecoTEC plus 937 installation and maintenance manual...

  • Page 25: Condensate Drain

    Please note that, when fitting a hydraulic diverter the diameter of the connection lines between the unit and the diverter must not be greater than 22 mm. Fig. 4.11 Installing the condensate drain ecoTEC plus 937 installation and maintenance manual...
  • Page 26 Specification for installation of gas–fired boilers of rated input not exceeding 70 kW net“. The condensate siphon must be filled with water as described in Section 5.6 before the combi boiler is commissioned. ecoTEC plus 937 installation and maintenance manual...

  • Page 27: Installing The Pressure Relief Discharge Pipework

    • Refer to the separate air/flue duct installation Please note that the end of the discharge pipe must instructions included with the appliance. be visible. Note! We recommend that the discharge pipe for the pressure relief valve is not shortened. ecoTEC plus 937 installation and maintenance manual...

  • Page 28: Electrical Connection

    • Unclip the back cover of the electronics box and lift the cover upwards to reveal the connections. Caution! Danger of damage to the equipment! Do not connect mains 230 V power to the terminals 7-8-9 or eBUS (+, -). ecoTEC plus 937 installation and maintenance manual...

  • Page 29: Connection To The Power Supply

    • Push the plug X12 of the pump cable onto the plug not trapped or pinched. socket X12 (5) on the printed circuit board. • Lift the electronics box up and secure. ecoTEC plus 937 installation and maintenance manual...

  • Page 30: Wiring Diagrams

    Room thermostat 230 V/50 Hz (Remove bridge when connecting) Heating pump 2 speed pump (plug with 5 pins) Fuse 2 A, slow-acting Igniter Shift load storage tank pump connection 230 V Fig. 4.19 Wiring diagram electronics box ecoTEC plus 937 installation and maintenance manual...
  • Page 31 X 2/2 black (Earth) Plate heat exchanger X 2/6 Green (Signal) (NTC) X 2/5 violet (Signal) X 2/1 black Hot water outlet (NTC) X 20 — 230V Electronics box Fig. 4.20 Wiring diagram combi boiler ecoTEC plus 937 installation and maintenance manual...
  • Page 32 X 1/2 Brown X 1/2 brown X 1/1 Black X 1/1 Black X 1/10 Black — 230V X 1/11 Red X 1/9 Grey Boiler electronics box Fig. 4.21 Wiring diagram shift load storage tank ecoTEC plus 937 installation and maintenance manual...

  • Page 33: Control Units

    Fig. 4.22 Details for the connection of timers frost protection thermostat. This frost protection thermostat should be connected to the terminals 3 and ecoTEC plus 937 installation and maintenance manual...

  • Page 34: Heating Pump

    23 hour period and also operates the diverter valve. This controller prevents the jamming up of these components if the combi boiler is inactive for long periods. This controller is inactive if the power supply to the unit is switched off ecoTEC plus 937 installation and maintenance manual...

  • Page 35: Commissioning, Part I 5

    • Open the cold water isolating valve under the Note! appliance. The water then flows through the combi The ecoTEC plus 937 is supplied fitted with a boiler and the shift load storage tank to the hot water pressure gauge and a digital pressure display.

  • Page 36: Filling Device For Ecotec Plus 937

    5 Commissioning, Part I 1 5.4.2 Filling device for ecoTEC plus 937 The ecoTEC plus 937 is fitted with a filling loop. Fig. 5.3 Double check valve separated from the system during the heating process Fig. 5.2 Filling device • Push the double check (1) of the filling loop into the 5.4.3...

  • Page 37: Initial Flushing Of The System ("Cold")

    Fig.5.4 Filling the condensate siphon Fig. 5.5 Setting the bypass valve • Setting the by-pass valve using the setting screw (1). ecoTEC plus 937 installation and maintenance manual...

  • Page 38: Checking The Gas Supply

    • Loosen the sealing screw on the gas valve marked with (1) in the illustration. • Connect a digital pressure gauge or U-tube manometer (2). • Open the gas isolation valve on the combi boiler. ecoTEC plus 937 installation and maintenance manual...

  • Page 39: Fitting The Front Casing

    Gas conversion Note! To convert the appliance from natural gas to liquid gas you will need the Vaillant modification kit Part No. 00 2001 0641. To convert the appliance from liquid gas to natural gas you will need the Vaillant modification kit Part No.

  • Page 40: Functional Checks (Commissioning, Part Ii)

    • Open the hot water tap fully. • Press "i" to activate the status indicator. If the hot water operation is operating properly, the display shows "S.14". Fig. 6.1 Function check Fig. 6.3 Display during hot water preparation ecoTEC plus 937 installation and maintenance manual...

  • Page 41: Storage Tank Charging

    • Check the heating system for leaks. on a through-flow principle. • Connect a hose to the drain valve which is located at the lowest position in the heating system. ecoTEC plus 937 installation and maintenance manual...

  • Page 42: Handing Over The Device To The Owner

    6.3.3 First aid temperature to the required temperature. In the event of a fault on your Vaillant boiler firstly • Set the controller for the maximum hot water consult your installer since his services must be temperature to the required temperature.

  • Page 43: Inspection And Maintenance 7

    1.5 bar and bleed the heating system. In order to ensure all the functions of the Vaillant • Open the isolation valve of the gas supply pipe. appliance over a long period, only genuine Vaillant spare •...

  • Page 44: Maintenance

    Check the boiler for any leaks and seal if necessary. 18 Fill out gas commissioning checklist (Benchmark). Table 7.1 Inspection and maintenance steps ecoTEC plus 937 installation and maintenance manual...

  • Page 45: Function Check Of The Combination Boiler

    • Remove the front of the of the unit by pulling the bottom edge forwards and lifting slightly. • Lower the electronic box. ecoTEC plus 937 installation and maintenance manual...

  • Page 46: Cleaning The Integral Condensation Heat-Exchanger

    Avoid pointing the water jet directly at the insulating surface (2) on the back of the heat exchanger. If necessary, the heat-exchanger can be cleaned using ordinary vinegar. ecoTEC plus 937 installation and maintenance manual...

  • Page 47: Checking The Burner

    Table 7.1). If the burner flange insulation on the thermo-compact module shows any signs of damage or is showing small cracks it must also be replaced. Fig. 7.7 Connecting the gas supply ecoTEC plus 937 installation and maintenance manual...

  • Page 48: Cleaning The Condensate Siphon

    • Remove the lower section (1) of the water condensate siphon by turning the bayonet connection in a counterclockwise direction. • Clean the siphon part by flushing it out with water. ecoTEC plus 937 installation and maintenance manual...

  • Page 49: Checking Filling Pressure Of The Expansion Vessel Of The Combination Boiler

    • Screw the seal cap (2) back onto the expansion vessel. • Refit the valve cover. • Re-fit the cover. • Re-pressurise the combi boiler and the heating system. • Re-pressurise the combi boiler and the hot water system. ecoTEC plus 937 installation and maintenance manual...

  • Page 50: Re-Commissioning The Combination Boiler

    • Check whether the heating system and the hot water preparation is functioning. • Complete the Benchmark gas boiler commissioning checklist in the rear section of these instructions. Fig. 7.13 Function check ecoTEC plus 937 installation and maintenance manual...

  • Page 51: Troubleshooting 8

    Meaning Heating mode: No heat demand Fan running Pump running Ignition Burner ignited Fan and pump running Fan over run Pump overrun time Anti-cycling mode Table 8.1 Status codes (continuation see next page) ecoTEC plus 937 installation and maintenance manual...

  • Page 52: Diagnostic Codes

    S.97 Water pressure sensor test, heat demands (hot water or heating) are blocked S.98 Flow/return flow sensor test, heat demands (hot water or heating) are blocked Table 8.1 Status codes (continuation) ecoTEC plus 937 installation and maintenance manual...
  • Page 53 Setting = 0: Unregister shift load storage tank from combi boiler (if shift load storage tank is to be de-installed, set d.92 = 0) d.97 Activation of the second diagnostic level Password: 17 Table 8.2 Diagnostic codes of the first diagnosis level ecoTEC plus 937 installation and maintenance manual...

  • Page 54: Second Diagnostic Level

    2 = Permanent heating position d.71 Maximum flow temperature knob setting Adjustment range in °C 40 to 85 (Factory setting: 75) Table 8.3 Diagnostic codes in the second level (continuation see next page) ecoTEC plus 937 installation and maintenance manual...

  • Page 55: Error Codes

    The fault memory of the unit stores the information concerning the last ten errors. • Press the "i“ and „-“ buttons simultaneously. • Scroll backwards with button "+“ through the list of stored errors. ecoTEC plus 937 installation and maintenance manual...
  • Page 56 No valid appliance variant for display and/or electronics Spare parts error: Display and electronics changed at the same (DSN number invalid) time appliance variant not re-set Table 8.4 Error codes (continuation see next page) ecoTEC plus 937 installation and maintenance manual...

  • Page 57: Test Programmes

    Test programme where the appliance is operated in full load after successful ignition. Test program where the appliance is operated with minimum gas volume (ignition gas volume) after successful ignition not available not available Table 8.5 Test programmes ecoTEC plus 937 installation and maintenance manual...

  • Page 58: Replacing Components

    Replacing the burner Danger! Before replacing components ensure that the safety instructions from Section 9.1 are observed. Fig. 9.2 Removing the fan with gas fitting Fig. 9.1 Replacing the burner ecoTEC plus 937 installation and maintenance manual...

  • Page 59: Replacing The Expansion Vessel

    • Fill and vent the combi boiler. and drain the water out of the combi boiler. • After completion of the work check the system for gas leaks and carry out a function test (see Section 7.8). ecoTEC plus 937 installation and maintenance manual...

  • Page 60: Replacing The Primary Heat Exchanger

    (see Fig. 9.5). • Filling and vent the combi boiler as required. • After completion of the work check the system for gas leaks and carry out a function test (see Section 7.8). ecoTEC plus 937 installation and maintenance manual...

  • Page 61: Replacing The Expansion Vessel Of The Shift Load Storage Tank

    • Release the sensor wire of the pump from the wiring harness by pulling the plug off the wiring harness. • Unscrew the sheet metal bracket (6) from the chassis. • Release the fitting (2) on the connector pipe (3). ecoTEC plus 937 installation and maintenance manual...

  • Page 62: Replacing The Aqua Sensor

    Replacing the electronics on the shift load storage tank Fig. 9.9 Replacing the aqua sensor Fig. 9.10 Replacing electronics Danger! Before replacing components ensure that the safety instructions from Section 9.1 are observed. ecoTEC plus 937 installation and maintenance manual...

  • Page 63: Replacing The Electronics And The Display On The Combination Boiler

    Appliance type ecoTEC plus 937 Table 9.1 DSN Setting Values • Exit the diagnostic mode. The combi boiler ecoTEC plus 937 is ready for operation. 9.10 Replacing the electronics and the display on the combination boiler Danger! Before replacing components ensure that the safety instructions from Section 9.1 are...

  • Page 64: Recycling And Disposal

    10.1 Unit • Press the "i“ and "+“ buttons simultaneously. The Vaillant ecoTEC consists to a large extent (up to The "full load mode" is de-activated. Deactivation of 92 %) of metallic components designed for recycling by the full load mode if no button is pushed within a melting down in the steelworks.

  • Page 65: Appendix

    Appendix EC declaration of conformity EC declaration of conformity ecoTEC plus 937 installation and maintenance manual...

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