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Summary of Contents for Rinnai Continuum Series
- Page 1 RINNAI Continuum Water Heater Model REU-2424-W and REU-2424-C General Use Rinnai Corporation 103 International Drive Peachtree City, Ga. 30269 Telephone number (800)621-9419...
- Page 2 No portion or part of this manual may be copied without prior permission from Rinnai Corporation. Key to Warning Symbols Failure to comply with the following instructions may results in serious personal injury or damage to the appliance. Be careful of possible electric shock. Wiring inside this appliance may potentially be at 120 volts.
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Page 3: Table Of Contents
Operation Flow Principle …………………………………………………………………… Operation Principles ………………………………………………………………………… Error Messages ……………………………………………………………………………… Diagnostic Points ……………………………………………………………………………. Wiring Diagram …………………………………………………………………………….. Fault Diagnosis ……………………………………………………………………………… Electrical Component Analysis ……………………………………………………………. Gas Pressure Setting Procedure …………………………………………………………… Dismantling for Service ……………………………………………………………………. Exploded Diagram ………………………………………………………………………….. Parts List …………………………………………………………………………………….. REU2424 Rinnai... -
Page 4: Glossary Of Terms And Symbols
∅ diameter ∆ °F delta T or temperature rise above ambient modulating valve thermal efficiency thermistor temperature of incoming water temperature of outgoing water REU2424 Rinnai... -
Page 5: Introduction
Introduction The brand name Continuum refers to “Endless Hot Water”. The new Continuum series has been developed in response to the growing changes in the lifestyle of our customers, and the increasing diversification and sophistication of demand in the marketplace. -
Page 6: Features
The Continuum 2424 and 2402 models will supply up to 6.5 GPM’s, controlled by an automatic electro- mechanical water control flow device. Details pertaining to water flows can be found in the water flow charts in this manual. REU2424 Rinnai... - Page 7 140 – 180 ° F. The “MCC” key pad can be configured to deliver water temperatures from 96 - 140°F in low temperature applications. Contact Rinnai for details when using the commercial unit in temperature applications below 140°F . This allows the Continuum to be set to comply with various State codes pertaining to temperature control in homes, child care centers, and elderly care centers were the temperature can not excess a certain set point.
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Page 8: Dimensions
Dimensions Note: All dimensions are in inches. REU2424 Rinnai... -
Page 9: Installation
Installation Recommended piping. . REU2424 Rinnai... -
Page 10: Remote Controls
The remote offers self-diagnostics in the event of a fault with the unit, simplifying service calls. • Flashes “LC” in the event of a liming condition. To reset the “LC” mode, power must be turned off to the unit and then reapplied. REU2424 Rinnai... - Page 11 There must be at least one cable from the remote control(s) connected to the Continuum water heater. Power for the remote(s) is supplied from the PC board. On the front of the PCB, there are two screws labeled terminal, this is the 12VDC digital power supply for the remotes. REU2424 Rinnai...
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Page 12: Safety Devices
37 °F. This unique feature will heat the water in the lines inside the appliance back up to 57 °F. Both of the above features function as long as the unit has power. There is REU2424 Rinnai... - Page 13 If the outgoing water temperature reaches 5 °F above the preset temperature, the burner will automatically go out. The burner will only ignite again once the outgoing hot water temperature falls below the preset temperature. REU2424 Rinnai...
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Page 14: Specification
Type of appliance Temperature controlled continuous flow gas hot water system Operation With or without remote controls, mounted in Kitchen, bathroom, or laundry room Exhaust system Forced combustion Rinnai model No. REU-2424-W REU-2424-WC Minimum gas rate 19,000 BTU’s Maximum gas rate 180,000 BTU’s... -
Page 15: Cut-Away Diagram
Cut – away Diagram REU2424 REU2424 Rinnai... -
Page 16: Schematic Diagram
Schematic Diagram REU2424 Rinnai... -
Page 17: Combustion Specifications
Contact Rinnai before setting or changing any switches Contact Rinnai for dip switch settings when changing PC board or setting up unit for special applications. Failure to set dip switches to the proper position, will result in damage to the unit, property damage, personal injury or death. -
Page 18: Water Flows
GPM’s = 147,600 ÷(Requested water temperature – incoming water temperature) x 500 GPM’s = 147,600 ÷ (120 °F requested – 65 °F incoming) x 500 GPM’s = 147,600 ÷ (55 °F delta T x 500) GPM’s = 147,600 ÷ 27,500 GPM’s = 5.367 REU2424 Rinnai... - Page 19 T or temperature rise. Then, locate your temperature rise at the bottom of the chart. Follow that line vertically until it intersects with the flow rate line to the right. This indicates the flow rate at your temperature rise. REU2424 Rinnai...
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Page 20: Main Components
12. Main Components Mechanical Water Regulator Rinnai’s unique water regulator mechanism ensures the hot water is maintained with no noticeable change to the desired temperature during use, even if water pressure drops due to another tap being turned on and increasing the demand. - Page 21 The water flow control consists of a plug and barrel valve which is rotated by a motor to increase or decrease the volume of water passing through the heat exchanger. REU-2424 units have an automatic water flow control device. REU2424 Rinnai...
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Page 22: Time Charts
13. Time Charts (External Unit) REU2424 Rinnai... -
Page 23: Operation Flow Principle
Operation Flow Principle REU2424 Rinnai... - Page 24 REU2424 Rinnai...
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Page 25: Operation Principles
, the default temperature can be set at 108, 120, 130, 140, 150, 160, 170, or 180 °F. To select one of the above temperatures as your default setting, you MUST obtain written permission and training from Rinnai. When the unit is first plugged into 120 volts, The PCB assumes an incoming water temperature of 77 °F, this prevents the appliance from starting in “High fire”, and producing very hot water the first time it is... - Page 26 The PCB stores data on the calculated incoming water temperature, ready for when the hot water is turned on again. The data is used to calculate the initial gas flow. REU2424 Rinnai...
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Page 27: Error Messages
Switch system OFF, then ON again, and re-attempt ignition. 2. Appliance operates however symptoms remain, with digital display dropping out and error code message is flashing. • Isolate potentially faulty components using the component analysis table on page #41 through #45. REU2424 Rinnai... -
Page 28: Diagnostic Points
Orange ~ Orange 30 ~ 50 VAC 3.2 ~ 3.7 Ω Brown ~ Grey 180 ~ 220 VAC 237 ~ 260 Ω Yellow ~ Grey 110 ~ 125 VAC Surge 21 ~ 26 Ω Protector Black ~ White REU2424 Rinnai... -
Page 29: Wiring Diagram
18. Wiring Diagram W: White Bk: Black Br: Brown Blue Y: Yellow Pink Or: Orange Gr: Green Gy: Grey REU2424 Rinnai... - Page 30 Block Diagram REU2424 Rinnai...
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Page 31: Fault Diagnosis
1.0 ~ 1.4 Ω Brown ~ Grey = 30 ~ 50 VAC 3.2 ~ 3.7 Ω Yellow ~ Grey = 180 ~ 220 VAC 237 ~ 260 Ω If normal, check item 3 on next page. Faulty: Replace the transformer. REU2424 Rinnai... - Page 32 Check the voltage at PCB connector C yellow and black wires. Normal: 2 ~ 10 VDC or 940 ~ 980K Ω. If normal, proceed to check item 2 on next page. Faulty: Replace the water flow sensor. REU2424 Rinnai...
- Page 33 , and measure resistance of the white ~ white wires. Resistance > 1 MΩ = open circuit. Resistance < 1Ω = short circuit. Normal: Proceed to check item 4 on the next page. Faulty: Replace water temperature thermistor. REU2424 Rinnai...
- Page 34 # Disconnect connector I and measure the resistance between the two sparker terminals. Normal: > 1 MΩ If there is no spark, adjust or replace the electrode. The sparker gap should be ” to ” . Faulty: Replace the sparker. REU2424 Rinnai...
- Page 35 If normal, check b below. Faulty: Replace the changeover solenoid (SV3). b. Measure the voltage at the changeover solenoid (SV3), blue – black wires. Normal: 80 – 100 VDC If normal, check 9, on next page. Faulty: Replace the PCB unit. REU2424 Rinnai...
- Page 36 Faulty: Ensure unit is properly grounded. Check ground circuit outside home at service pole. There should be an eight foot ground rod driven in the earth and a copper lead tied to the service meter. Ensure connection on ground rod is tight. REU2424 Rinnai...
- Page 37 Faulty: Replace the changeover solenoid (SV3). b. Measure the voltage at the changeover solenoid (SV3) blue ~ black wires. Normal: 80 ~ 100 VDC If normal, proceed to check item 3, on next page. Faulty: Replace the PCB unit. REU2424 Rinnai...
- Page 38 , connected (do not turn water ON… wait for the water flow servo to return to fully open), measure the voltage at the yellow ~ grey wires. Normal: Less than 0.5 VDC Faulty: Replace water flow servo and sensor. REU2424 Rinnai...
- Page 39 These are blue wires to this switch. Normal: Less than 1Ω If normal, check wiring harness for defects. (100 volts AC) Faulty: Replace the frost sensing switch. # If the atmospheric temperature is too high, cool the switch with ice. REU2424 Rinnai...
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Page 40: Electrical Component Analysis
6. Check to ensure 1. Measure voltage at the 100 ~ 120 VAC Go to A (6-2) you have 120 VAC blue and brown wires, and across both terminals the black and white wires. Replace PCB feeding the surge protector. REU2424 Rinnai... - Page 41 2. Check fan rotation 11 ~ 13 VDC Go to B-4-4 sensor. Measure voltage between Replace PCB black ~ yellow at connector D 3. Measure voltage 2 ~ 9 VDC Go to B-5 between black ~ white of connector Replace fan REU2424 Rinnai...
- Page 42 ~ red fuse Is resistance <1Ω? 10. Check overheat 2. #Disconnect OHS Replace PCB (remaining flame) bi- (remaining flame) bi- metal switch. metal switch festoon terminal B Replace measure resistance remaining flame between terminal on bi-metal switch switch. REU2424 Rinnai...
- Page 43 (POV) between 96° ~ 140°F. Ω 4. Check water flow 1. #Measure resistance Go to D-4-2 10 ~ 30 servo between red ~ blue Replace water wires of the water flow flow servo servo connector E sensor. REU2424 Rinnai...
- Page 44 Replace Anti- resistance between blue this switch for five frost sensing ~ blue wires leading minutes? switch. into this switch. Check this switch at temperatures below 37°F. You can place an ice cube against the switch to activate it. REU2424 Rinnai...
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Page 45: Gas Pressure Setting Procedure
“SW2” on the PC board to the “OFF” position, see figure #1 for location of these switches. They are called “combustion control switches”. Failure to reset these dip switches will lock the unit in a high fire mode, which could cause damage to the unit or a possible fire. REU2424 Rinnai... - Page 46 10. Verify you are getting the proper water temperature, as set on the controller at your outlets. If controllers are not being used the output temperature should be 120°F. Figure #1 Figure #2 Manometer test port Regulator High pressure setting pot adjustment screw REU2424 Rinnai...
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Page 47: Dismantling For Service
8. Removal of the Burner and Burner Manifold …………………………………………… 9. Removal of the Gas Valve Assembly……………………………………………………… !0. Removal of the Heat Exchanger Assembly ……..………………………………………… 50 10. Removal of the Thermal Fuse ……………………………………………………………… 51 Re-assembly in the reverse order of dismantling, unless stated otherwise. REU2424 Rinnai... -
Page 48: Removal Of The Front Panel
Phillips a. Remove the four (4) screws holding the panel in screw driver. Pull the pipe towards yourself to release place with a Phillips driver. it. Handle “O”ring carefully. REU2424 Rinnai... -
Page 49: Removal Of The Sparker
120 volt potential exposure. Isolate the appliance and b. Disconnect high tension lead and connector. reconfirm power has been disconnected using a multi- meter. a. Remove the two (2) Phillips screws that secure the thermistor in place to remove the water temperature thermistor. REU2424 Rinnai... -
Page 50: Removal Of The Transformer
120 volt potential exposure. Isolate the appliance and reconfirm power has been disconnected using a multi- meter. a. Remove the sparker, refer to section 4. b. Remove eleven (11) phillips screws that hold the combustion chamber front panel in place and remove the panel. REU2424 Rinnai... -
Page 51: Removal Of The Gas Valve Assembly
10. Removal of Heat Exchanger: CAUTION 120 volt potential exposure. Isolate the appliance and reconfirm power has been disconnected using a multi- meter. a. Remove PCB unit, refer to section 2-a. REU2424 Rinnai... -
Page 52: Removal Of The Thermal Fuse
Pull the heat exchanger assembly out of the unit. b. Disconnect and remove the thermal fuse. * Fit the fuse as shown below. 11. Removal of Thermal Fuse: CAUTION 120 volt potential exposure. Isolate the appliance and reconfirm power has been disconnected using a multi- meter. REU2424 Rinnai... -
Page 53: Exploded Diagram
24. Exploded Diagram (Cabinet) REU2424 Rinnai... - Page 54 Exploded View - Internals REU2424 Rinnai...
- Page 55 Exploded View - Internals REU2424 Rinnai...
- Page 56 Exploded View - Electrical REU2424 Rinnai...
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Page 57: Parts List
25. Parts List REU2424 Rinnai... - Page 58 Parts List Cont… REU2424 Rinnai...
- Page 59 Parts List Cont… REU2424 Rinnai...
- Page 60 Parts List Cont… REU2424 Rinnai...
- Page 61 Parts List Cont… REU2424 Rinnai...
- Page 62 Notes: REU2424 Rinnai...
- Page 63 REU2424 Rinnai...
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