Rinnai INFINITY 26i Service Manual
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Rinnai INFINITY 26i Service Manual

Infinity high capacity continuous flow gas hot water system
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INFINITY 26i and HD50i
SERVICE MANUAL
Infinity High Capacity Continuous Flow Gas Hot Water System

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Summary of Contents for Rinnai INFINITY 26i

  • Page 1 INFINITY 26i and HD50i SERVICE MANUAL Infinity High Capacity Continuous Flow Gas Hot Water System...
  • Page 2 Quality System Standard ISO 9001 - 1994 The Design, Development, and Manufacture of Gas Water Heating Appliances done under Rinnai’s Quality Management System is certified under the Quality Management System Standard ISO 9001. Registration Number JQ0003D Registered since: February 1994...
  • Page 3 Produced by Rinnai Technical Services Department August 2004 - Issue 1. No portion or part of this manual may be copied without prior permission from Rinnai U.K. Rinnai U.K. reserves the right to make modifications and change specifications without notice.

  • Page 4: Table Of Contents

    17. Gas Conversion Procedure ..................35 18. Dismantling for Service ..................44 19. Exploded Diagram ....................50 20. Parts List ....................... 54 21. SERVICE CONTACT POINTS ................58 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - iii - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 5: Glossary Of Terms And Symbols

    ø diameter ∆ temperature rise above ambient modulating valve thermal efficiency thermistor temperature of incoming water temperature of outgoing water Infinity REU-V2632FFU / HD200I REU-V2632FFUC - iv - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 6: Introduction

    Features • The Infinity 26i and HD50i NEVER RUN OUT of hot water. Whilst electricity, water and gas supplies are connected, hot water is available whenever hot water taps are open. • Built into the main micro-processor is the facility to LIMIT THE MAXIMUM TEMPERATURE of the hot water supplied.

  • Page 7: Specifications

    Note 1: The default factory setting is 55ºC for the Infinity26i, and 65°C for HD50i. The unit can be ordered from Rinnai to be pre-set to any of the other temperatures listed. The unit can be pre-set to any of the temperatures listed by a suitably qualified person.

  • Page 8: Sensors And Safety Devices

    * * The TPP is measured with the cover ‘off’ the appliance at the regulator test point with supply pressures of 20 mbar (NG) and 37 mbar (Propane). Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 3 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 9: Water Flow Rates And Pressures

    M = 60 x ( 47 / (4.2 x 10) ) = 67 l/min. Since 67 is greater than 26 this flow rate is mixed. This result corresponds with the value in Table 1. Table 1: Approximate Water Flows & Gas Usage - Rinnai Infinity 26i and HD50i - Preset Table Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 4 - Issue 1 - 8/09/03 ©Rinnai...
  • Page 10 Table 1. Approx. Water Flows & Gas Usage - Rinnai 26i and HD50i P reset Temp. Less than 60°C. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 5 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 11 Approx.Water Flows & Gas Usage -Rinnai Infinity26i and 50i P reset Temp .Greater than or equal to 60°C Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 6 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 12 Water Pressure The water pressure vs flow characteristics are as follows: WATER PRESSURE/FLOW RATE INFINITY 26i AND HD50i 37 -55 INFINITY 26i AND HD50i:60 WATER PRESSURE(bar) Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 7 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 13: Dimensions

    4. Dimensions Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 8 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 14: Remote Controls

    (suggested height from floor at least 1500mm). Controllers are water resistant, however, durability is improved when positioned outside the shower recess or at least 400mm above the highest part of a sink, basin or bath. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 9 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 15: Remote Controller Connection

    Controllers are supplied with 15 m of electrical cable. The cable wires for connection to the appliance are fitted with spade terminals. Extension cables are available from Rinnai. Alternatively, a two core sheathed (double insulated) flex with minimum cross-sectional area of 0.5 mm² can be used. Maximum cable length is 50 m.
  • Page 16 15.Replace cover of the Appliance. Ensure that the screw with the star washer is placed at the bottom right hand corner for earthing purposes. Remote control cables fig. 3 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 11 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 17 STEP 1 for the controller moved from the kitchen to the bathroom. Then perform STEP 1 for the controller moved from the bathroom to the kitchen. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 12 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 18: Cutaway Diagram

    6. Cutaway Diagram Infinity 26i and 50i Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 13 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 19: Operational Flow Chart

    7. Operational Flow Chart Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 14 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 20: Operation Principles

    PCB then causes the main solenoid and solenoid valves to close and the burner is extinguished. The combustion fan will continue to operate for some time to purge the combustion chamber. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 15 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 21: Main Components

    The water flow and bypass valves are a combined assembly on the cold water inlet of the appliance. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 16 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 22 • A combustion chamber. Integrated into the combustion chamber front panel are the flame rod and two ignition electrodes. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 17 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 23: Time Charts

    10. Time Charts Infinity 26i and HD 50i Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 18 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i - 18 -...

  • Page 24: Wiring Diagram

    11. Wiring Diagram AC 230V Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 19 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 25: Dip Switch Settings

    12. Dip Switch Settings WARNING: Dip Switch settings must only be changed by an authorised person. Dip Switch Settings for Infinity 26i and HD50i Dip Switch Settings for Infinity 26i and HD50i Note: Unit must be specially converted for delivery at 85 C for REU-V2632FFUC models only.

  • Page 26: Fault Finding

    (page 31) Dismantling for Service Detailed information on how to remove and replace components. (page 41) Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 21 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i -21- Issue 1 08/04 Infinity 26i and HD50i...
  • Page 27 Check water flow servo not controlled, temp too low Solenoid valve circuit error. Unit Check Gas Valves are open visual does not operate Check Solenoids Flame Rod Circuit Error. Unit does Check Flame Rod not operate Infinity 26i and HD50i...
  • Page 28 Check anti frost heater components operate. Check frost sensing switch Check Gas Supply is correct Upon commissioning the gas Check Gas Filter pressure will not achieve correct Check flue terminal for blockages visual high pressure Check Flue Infinity 26i and HD50i...
  • Page 29 1 M Ohm (1000 k Ohms) If this is not correct replace the sparker box / sub pcb. If this is correct, but the electrode is not sparking then visually inspect the electrode, clean it, set the gap, or replace it. Infinity 26i and HD50i...
  • Page 30 Current should be over 1 micro (µ)Amp If current is more than this the pcb is faulty. If current is less than this the flame rod is faulty or needs cleaning. Infinity 26i and HD50i...
  • Page 31 If the resistance is greater than 1 Ohm test each individual sensor to find which one is faulty and replace it AFTER checking the heater for damage. Check that the gas type and combustion dip switch settings are correct. Confirm gas pressure when the unit is operating again. Infinity 26i and HD50i...
  • Page 32 If one of the servos is not operating correctly it is probably the servo motor, but could potentially be the pcb. Continue on. Infinity 26i and HD50i...
  • Page 33 Brown – White 2 – 6 Vdc Orange – White 2 – 6 Vdc Yellow – White 2 – 6 Vdc Red – White 2 – 6 Vdc If these values are incorrect replace the bypass servo. Infinity 26i and HD50i...
  • Page 34 If Black – Red is incorrect replace pcb If Yellow – Black is incorrect replace water flow sensor. Before you replace the water flow sensor be sure you have checked the filter (R) and for air locks (M). Infinity 26i and HD50i...
  • Page 35 This thermistor is located in the combustion air fan. To find it the first time you may need to remove the combustion air fan. Do not pull the fan out too quickly or you will ruin the thermistor. Infinity 26i and HD50i...
  • Page 36 If there is no power at this point you must find where the connection has been lost. O. 3 Amp Fuses The unit has two inline 3 Amp fuses. Remove the fuse and check for continuity through. If there is continuity the fuse is good, if not replace it. Infinity 26i and HD50i...
  • Page 37 It holds a small micron basket strainer. The strainer becomes clogged easily, especially after installation. When it is clogged sometimes water will travel through the unit without triggering the flow sensor. Make sure you check any external Y- strainers as well Infinity 26i and HD50i...
  • Page 38 S. Water flow. To operate there must be at least 2.4 l/min flowing through a Rinnai water heater. If there is multiple heaters, installed without PAM valves or a MECS system then there must be 2.4 l/min per heater. A modern wash hand basin could be as low as 3 or 4 l/min, so if there is no means of staging the heaters they may not operate.
  • Page 39 9m. If there is a condensate trap installed, be sure it is the right way up (with the male section at the bottom.) Infinity 26i and HD50i...

  • Page 40: Component Circuit Value Table

    Solenoid Valve 2 B-Bk 1.7~2.1k DC80~100V Solenoid Valve 3 Br-Bk 1.7~2.0k B-Br 16~18 Transformer W-Bk AC90~110V Valve Heater 50~56k Valve Heater 444~510k and Square Heater Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 23 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 41 17. The maintenance number will be shown in the Water Temperature display. 18. Data will be shown in the Clock display. 19. To select the required maintenance number, press the Water Temperature "UP" and "DOWN" buttons. Note: Infinity 26i and HD50i use Maintenance Numbers 1-12. Display Monitor Contents Contents Units...
  • Page 42 Press the ON/OFF button again while holding the Water Temperature “UP” (Hotter) button. • This feature will automatically shut down after 3 minutes. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 32 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 43: Gas Pressure Setting Procedure

    Set the Infinity to 'Forced Low' combustion by setting No. 7 dipswitch of the top (SW1) set of dip switches to 'ON'. (fig.3) 10) Check the burner test point pressure. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 33 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 44 DURING PRESSURE TESTING OF THE INSTALLATION ENSURE GAS VALVE SITUATED BEFORE UNIT IS SHUT OFF. FAILURE TO DO SO MAY RESULT IN SERIOUS DAMAGE TO THE APPLIANCE AND POSSIBLE INJURY. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 34 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 45: Gas Conversion Procedure

    Clean combustion deposits on the burner if necessary ④ Replace Manifold fit Gasket to Gas Control. For NG: U245-200-D 101-560-000 101-559-000 For Propane: U245-200-A Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 35 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 46 ⑤ Change Gas Type Switch on PCB Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 36 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 47 ⑥ Change Dipswitch No. 7 for low combustion ⑦ Turn ON outgoing water tap ⑧ Set pressure low with solenoid valve adjustment Low Capacity mbar N.G. Propane Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 37 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 48 ⑮ Check leakage from gas control, manifold connection and pressure point sealing screw ⑯ Refit front cover ⑰ Turn ON 230V power supply Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 38 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 49 Anti Frost Heater Installation Anti Frost Heaters come as standard on ALL Rinnai Infinity and Heavy Duty water heaters sold in the UK. They will not need to be installed on site. The diagram on the following page shows where the elements are located.
  • Page 50 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 40 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 51: Dismantling For Service

    18. “Removal of Thermal Fuse” ..........49 Unless otherwise stated, re-assembly is the reverse of dismantling. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 41 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 52: Removal Of The Front Panel

    Removal of the PCB Unit a. Remove the front panel. (Refer Item 1.) b. Remove two (2) PCB unit fixing screws and pull out forward. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 42 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 53: Removal Of Transformer

    Removal of the manifold and burner unit a. Remove high tension cord and flame rod. b. Remove 2 pin connection of the solenoid valve c. Remove manifold. Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 43 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 54: Removal Of The Gas Control

    Remove combustion chamber front panel. b. Remove burner unit. d. Pull off connectors for gas control modulation valve and solenoid valve. c. Pull off burner unit Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 44 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 55: Removal Of Flame Rod And Spark Plug

    12) Removal of air intake thermistor a. Remove fan motor b. Remove 2 pin connector of inlet thermistor c. Remove inlet thermistor (care with O-ring) d. Thermistor Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 45 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 56: Removal Of Bypass Servo

    Removal of inlet water connection c. Anti Frost switch g. Remove bypass servo and water flow servo h. Remove fitting screws of bypass servo Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 46 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 57: Removal Of Anti Frost Heater

    Remove 2 pin connector of solenoid valve. c. Remove joint bracket d. Remove connection joint from the fan motor e. Remove fan motor screw Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 47 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 58: Removal Of Heat Exchanger

    Remove thermal fuse, over heat switch, sparker, hex thermister and back pressure joint. k. Remove fixing screws of the heat exchanger unit Remove heat exchanger screws Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 48 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 59: Removal Of Thermal Fuse

    Remove Thermal Fuse After removal of thermal fuse fitting procedure is as follows: Heat Exchanger Front Heat Exchanger Rear Heat Exchanger Left Heat Exchanger Right Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 49 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 60: Exploded Diagram

    19. Exploded Diagram Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 50 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 61 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 51 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 62 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 52 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 63 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 53 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 64: Parts List

    222-513-000 FAN MOTOR Assy U245-753 FAN CASING Assy U245 -555 CONNECTION, Fan BH29-606X08 PACKING, Fan Conn. U245-750 FAN MOTOR U245-753 BELL MOUTH U245-558X01 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 54 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 65 HOLDING PLATE, Large CP-90172 MOUNT BKT, Fuse U217-676X02 SWITCH, Frost Sensor 234-540-000 U242-511 235-308-000 HEATER Assy, A/Frost U245-775 HEATER, Valve U245-776 MOUNTING BRACKET, Htr CF29-742X01 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 54 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 66 M10B-2-14 520-281-010 O-RING M10B-2-7 520-043-010 O-RING M10B-1-24 WASHER C36E1-6 CONVERSION KIT Nat. Gas 923L2130NG0 CONVERSION KIT LPG 923N2130LPG INSTALLATION AND USER INSTR U245-790 Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 55 - Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...
  • Page 67 Notes Infinity REU-V2632FFU / HD200I REU-V2632FFUC - 57- Issue 1 - 8/09/03 ©Rinnai Infinity 26i and HD50i...

  • Page 68: Service Contact Points

    SERVICE CONTACT POINTS Rinnai Rinnai UK LTD. 9 Christleton Court Manor Park Runcorn Cheshire WA7 1ST Tel. 01928 531870 Fax. 01928 531880 E-mail. info@rinnaiuk.com Web. www.rinnaiuk.com -58- Infinity 26i and HD50i...

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