Rinnai INFINITY EF250 Service Manual
Continuous flow water heater
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Summary of Contents for Rinnai INFINITY EF250
- Page 1 EF250 external: REU-KM3237WD INFINITY EF250 continuous flow water heater Service manual...
- Page 2 Improper installation, adjustment, alteration, service and maintenance can cause property damage, personal injury or loss of life. Help is here For more information about buying, using, and servicing of Rinnai appliances call: 0800 RINNAI (0800 746 624). Rinnai New Zealand Limited...
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Page 3: Table Of Contents
Contents Rinnai INFINITY EF250 external specification ..4 Cutaway diagram..........6 Main components ..........7 Operation principles - hot water operation....8 Sensors and safety functions .......9 Water flow rates and pressure characteristics ..10 Time charts ............11 Operational flow chart...........12 Wiring diagram .............14 Component and circuit checks ......15 Diagnostic codes ..........18... -
Page 4: Rinnai Infinity Ef250 External Specification
Rinnai INFINITY EF250 external specification Description Designed and made in Japan, the Rinnai INFINITY EF250 is a condensing continuous flow water heater with inbuilt frost protection. It has electronic ignition and requires electricity to operate. The INFINITY EF250 is factory preset to 55 °C. - Page 5 Gas connection From centreline From centreline 103.2 From wall 137.6 From wall Hot water connection From centreline From wall Electrical connection Cold water connection From centreline From centreline 27.2 From wall 79.6 From wall INFINITY EF250 service manual 01-21 | 5...
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Page 6: Cutaway Diagram
Hot dipped aluminium Heat exchanger thermistor front plate assembly coated steel sheet Manifold assembly Aluminium casting Igniter Gas control assembly Bypass flow control device Water flow sensor Gas connection Aluminium casting Water filter assembly 6 | INFINITY EF250 service manual 01-21... -
Page 7: Main Components
PCB. The water valve restricts the are the flame rod and ignition electrode(s). flow of water into the heat exchanger assembly if the programmed temperature cannot be achieved. Also when INFINITY EF250 service manual 01-21 | 7... -
Page 8: Operation Principles - Hot Water Operation
The 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. 8 | INFINITY EF250 service manual 01-21... -
Page 9: Sensors And Safety Functions
In the case of a combustion fan fault (no rotation of fan sensor blades) the gas supply is stopped. Temperature cutout If the delivered hot water temperature rises above the required delivery temperature for a number of seconds the gas supply is stopped. INFINITY EF250 service manual 01-21 | 9... -
Page 10: Water Flow Rates And Pressure Characteristics
Water flow rates and pressure characteristics Water pressure/volume Bypass fully open Bypass fully closed Water pressure (MPa) Water pressure (MPA) Water flow rate bypass Water flow rate bypass fully closed L/min fully open L/min 0.01 4.76 7.42 0.02 6.53 9.64 0.03 8.03 11.81... -
Page 11: Time Charts
12 flashing Pre-purge defect sequence Combustion sequence open closed Water flow sensor Water flow ctrl. device Fan motor Inspection line Fan rotation inspection 12 sec Priority indicator In use indicator Digital monitor 61 flashing INFINITY EF250 service manual 01-21 | 11... -
Page 12: Operational Flow Chart
Modulating solenoid valve OFF Condensate pipe blockage 25 flashing Combustion indicator OFF Incorrect setting 70 flashing Combustion fan OFF (after 65 secs ) HEX outgoing temp. < 60 °C Only applicable when remote controller is connected 12 | INFINITY EF250 service manual 01-21... - Page 13 Water flow control valve close Operation stop Bathfill switch flashing (operation is cancelled) Bathfill switch off Water flow control valve open Bathfill switch lamp off Close hot water tap at bath (no inspection of water) Voice 5 INFINITY EF250 service manual 01-21 | 13...
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Page 14: Wiring Diagram
Wiring diagram 14 | INFINITY EF250 service manual 01-21... -
Page 15: Component And Circuit Checks
B and measure voltage between solenoid 3 connectors. between Brown-Black. Faulty: Replace PCB. Measure resistance between Normal: 37~43 V. If normal go to 7. solenoid 3 connectors. Faulty: Replace solenoid valve 3. INFINITY EF250 service manual 01-21 | 15... - Page 16 Measure voltage between Yellow- Normal: DC4~6 V. Grey with relay connector G2 connected (with no water flowing, Faulty: Replace water flow servo and water flow water flow servo fully open). sensor. 16 | INFINITY EF250 service manual 01-21...
- Page 17 Faulty: Replace antifrost heater. side. Frost sensing Disconnect relay frost sensing switch Normal: < 1 Ω. If normal check wiring (AC 240 V switch F4 and measure voltage between circuit). Blue-Blue. Faulty: Replace frost sensing switch. INFINITY EF250 service manual 01-21 | 17...
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Page 18: Diagnostic Codes
Check power cord and gas supply are turned on on controllers if fitted • Check electrical fuse • Check gas valves • Check sparker unit • Check earth leads and connections • Check for short circuits • Check controllers if fitted 18 | INFINITY EF250 service manual 01-21... - Page 19 • Check HEX outlet thermistor • Check gas valves • Check water flow servo • Check bypass servo Antifrost heater does not operate Check antifrost heater components and frost sensing switch INFINITY EF250 service manual 01-21 | 19...
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Page 20: Maintenance Monitor And Error Code History
To mute the audible beep, press and hold the and buttons until an audible beep is heard (takes approximately five seconds). Child lock There is no lock function on the inbuilt controller—locking the temperature is done by changing the PCB settings. 20 | INFINITY EF250 service manual 01-21... -
Page 21: Maintenance Parameters
(MC-601). Maximum temperature is 50 °C Number of master controllers, will be 0 or 1 111 means: • Two bathroom controllers (1 +1) • One master controller Number of bathroom controllers, will be 0, 1, or 2 INFINITY EF250 service manual 01-21 | 21... -
Page 22: Hex Vinegar Flush
11. Disconnect the hose to the hot water supply pipe outlet and reconnect the hot water line. 12. Remove the in-line filter at the cold water inlet and clean out any residue. Place the filter back into the unit. 13. Restore the electrical power to the water heater. 22 | INFINITY EF250 service manual 01-21... -
Page 23: Dismantling For Service
Remove the flame rod • Remove the 2-pin connections on the solenoid valves • Remove the manifold • Remove the combustion chamber front panel, and remove the burner unit PCB unit Sparker Manifold Sparker Burner unit INFINITY EF250 service manual 01-21 | 23... - Page 24 6. Remove the gas control Remove the gas connection, pull off the connectors for the gas control modulation valve and solenoid valves, and remove the gas control. 7. Remove the flame rod and electrode Remove the flame rod terminal and tighten the sparker lead. Remove the three fixing screws and electrode holder.
- Page 25 12. Remove the overheat switch Remove the one fixing screw holding the overheat switch in place. 13. Remove the antifrost heater Remove the 2-pin connection of the antifrost heater. Remove the copper tube clips and remove antifrost heater. 14. Remove the heat exchanger •...
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Page 26: Condensate Drain
75 mm copper pipes, concrete paths, or and not exceed more than 150 mm into a pond. measured from the outlet of the drain pipe to the rim of the tundish. 26 | INFINITY EF250 service manual 01-21... -
Page 27: Dip Switch Settings
DIP switch settings Applicable models and REU numbers Rinnai INFINITY EF250 external REU-KM3237WD Rinnai INFINITY EFi250 internal REU-KM3237FFUD DIP switch 1: Upper SW (8P) SW No. Note EF250 Ext & EFi250 Int long flue EFi250 Internal short flue Flue settings (p. - Page 28 Rinnai.co.nz Tel: 0800 746 624 http://www.youtube.com/rinnainz http://facebook.com.rinnainz...
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