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Condensing models:
REU-DD300N26-0A
REU-DD300N26-0B
REU-DD300N26-1B
REU-DD300N32-0A
REU-DD300N32-0B
REU-DD300N32-1B
Demand Duo Gas fired storage water heater
Operation and installation manual
Non-condensing models:
REU-DD300VCM28-0A
REU-DD300VCM28-0B
REU-DD300VCM28-1B
REU-DD500VCM28-0A
REU-DD500VCM28-0B
REU-DD500VCM28-1B
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Related Manuals for Rinnai Demand Duo REU-DD300N26-0A
Summary of Contents for Rinnai Demand Duo REU-DD300N26-0A
- Page 1 Condensing models: Non-condensing models: REU-DD300N26-0A REU-DD300VCM28-0A REU-DD300N26-0B REU-DD300VCM28-0B REU-DD300N26-1B REU-DD300VCM28-1B REU-DD300N32-0A REU-DD500VCM28-0A REU-DD300N32-0B REU-DD500VCM28-0B REU-DD300N32-1B REU-DD500VCM28-1B Demand Duo Gas fired storage water heater Operation and installation manual...
- Page 2 Gas fired storage domestic hot water heaters are CE Marked according to Regulation 2016/426/EU and Directive 2014/53/EU. Demand Duo REU-DD300N26-0A Demand Duo REU-DD300N26-0B Demand Duo REU-DD300N26-1B Demand Duo REU-DD300N32-0A Demand Duo REU-DD300N32-0B Demand Duo REU-DD300N32-1B Demand Duo REU-DD300VCM28-0A Demand Duo REU-DD300VCM28-0B...
- Page 3 Dear Customer, our compliments for having chosen a Rinnai top-quality product, able to assure well-being and safety for a long period of time. As a Rinnai Customer you can also count on a qualified after-sales service to guarantee a constant efficiency of Your appliance.
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Page 4: Warranty
WHAT WILL RINNAI DO? Rinnai will repair or replace the product or any part or component that is defective in materials or workmanship, except as set forth below: - all repairs must be performed using genuine Rinnai parts;... -
Page 5: Table Of Contents
SUMMARY 1. USER’S INSTRUCTIONS ... .7 1.1 FEATURES AND BENEFITS ... 8 1.2 IMPORTANT SAFETY INFORMATION ..9 1.3 OPERATION . -
Page 7: User's Instructions
1. USER’S INSTRUCTIONS The following section provides specific instructions for proper maintenance of the product. This section is intended for the use by qualified technical personnel. -
Page 8: Features And Benefits
The recovery time of the domestic hot water tank is minimized for all the models available thanks to the high capacity of the instantaneous Rinnai generator which feeds the tank and ensures a high volume of domestic hot water which is always available. The possibility of reaching and maintaining high temperatures allows easy and effective prevention of legionella. -
Page 9: Important Safety Information
Rinnai technical service centre. Use original Rinnai parts to repair the appliance. In case of unusual noise, vibration or smell, stop the appliance and contact the Rinnai service for further information If you smell gas: - isolate the main gas supply;... -
Page 10: Operation
For the condensing models, a suitable condensate drain must be provided. 1.3 OPERATION The Rinnai Demand Duo series storage water heaters differ, according to the model, in the temperature regulation element which can be of the electronic or electromechanical type. -
Page 11: All Models
All Rinnai Demand Duo models do not provide for the connection of additional remote controls in addition to the one already included on board. -
Page 13: Installer's Instructions
2. INSTALLER’S INSTRUCTIONS The following section provides specific instructions for proper maintenance of the product. This section is intended for the use by qualified technical personnel. -
Page 14: Generalità
Under the current law, the systems must be held by qualified professionals. The Rinnai Demand Duo series are designed as domestic and professional storage hot water producers. The appliance must be installed on the ground, electrically powered, connected to the gas line and to the DHW system, possibly to the solar thermal system for the preset models. -
Page 15: Handling
Once the wooden support shown in the figure has been removed, Rinnai Demand Duo is at risk of overturning. During handling, secure it with straps to the trolley or lift it with an eyebolt from the top. -
Page 16: Variants And Main Components
• the symbol “-” as a separator, followed by “DD” which indicates the Demand Duo family • three digits indicating the nominal storage capacity • the code of the generator model (Rinnai Infinity water heater) • the “-“ symbol as a separator •... -
Page 17: Dimensions
2.4 DIMENSIONS Condensing models with 300lt storage tank - reference table #01, 03, 05, 10, 11, 12 Cold mains water inlet Hot water outlet Solar outflow Models #05, 06, 09, 12 Solar return Recirculation R 3/4 Safety valve R 3/4 Note: the fitting cover must be removed to gain access Condensate drain... -
Page 18: General Scheme And Connection Layout
Non Condensing models with 300lt storage tank - #07, 08, 09 2.5 GENERAL SCHEME AND CONNECTION LAYOUT Condensing models with 300lt storage tank - #01, 03, 05, 10, 11, 12 Gas fired generator (Condensing REU-N2635FFC or Cold water inlet R 1’’ REU-N3237FFC;... - Page 19 Water outlet to storage tank Flue system Tank pump Condensate drain Pump inlet valve (temperature probe housing behind) Cathodic protection electrode 3 way valve in/out to/from gas fired generator Cable hole Non Condensing models with 300lt storage tank - #02, 04, 06 Non-Condensing models with 500lt storage tank - #07, 08, 09 The components and their configuration on the Demand Duo with 500lt nominal capacity storage are the same as on the 300lt capacity models.
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Page 20: Installation
Note: the hydraulic components indicated must be prepared by the installer (they are not supplied by Rinnai). - Page 21 For the correct treatment of the water that feeds the product, it is necessary to refer to the local stadard regulation. All Rinnai Demand Duo series models are equipped with an electronic anode to protect the integrity of the tank.
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Page 22: Gas Connection
For more details, refer to the specific manual of the fitting cover supplied with the Rinnai Demand Duo. The piping must be made with suitable materials, avoiding that it interferes with the other elements secured to the bottom plate (electronic anode, temperature probes, etc...), nor does it rest against the right side wall of the fitting... -
Page 23: Electrical Connection
2.6.4 Electrical connection The appliance is supplied without a power cable: a suitable 3x0.75mm2 cable (minimum section) must be provided for the first installation. Connect the appliance to a 230V ±10% / 50Hz mains and a proper grounding. Both in the case of first installation and when replacing the power cable, these operations must be carried out exclusively by qualified technical personnel. -
Page 24: Drain System
The INDOOR model must be installed by ALWAYS connecting a Rinnai homologated flue system: they cannot be operated without having correctly installed the flue system. The indoor unit’s exhaust system is considered as part of the appliance: it is only possible to install certified and tested exhaust systems in combination with the appliance. -
Page 25: Multiple Demand Duo Installations
The wiring of the temperature probes positioned on the storage tank S2 and S3 (see figure below) and the connection of the storage tank loading pump on board the Rinnai Demand Duo are made in... -
Page 26: Solar Thermal System
To be thorough, the following sections describe the procedure for complete setting of the control unit, at first activation, replacement or reset to factory settings. For detailed indications not given in this manual, refer to the specific document of the MTDC control unit. If necessary, contact Rinnai Italia. Solar thermal system If the installation includes a solar thermal system whose management must be entrusted to the control unit, the “Solar with thermostat”... - Page 27 DTon / DToff is the temperature difference for activation and deactivation of the circulation pump. It is calculated as the difference between the temperature of the solar collector and the temperature detected by the lower probe of the storage tank. Standard values are set at 10°C on / 3°C off. Example: collector temperature 80°C, circulation pump activation at 80°C-10°C = 70°, deactivation at 80°C-3°C = 77°C.
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Page 28: Models Equipped With Electromechanical Thermostat
The generator must be set at a temperature of at least 5°C higher than that of the electro- mechanical thermostat. IMPORTANT To change the tank charging temperature – i.e. the temperature supplied by the generator – consult the Rinnai water heater manual REU-N2635FFC, REU-N3237FFC or REU-VCM2837FFUD depending on the Rinnai Demand Duo model considered. -
Page 29: Anti-Legionella Function
BOOSTER mode. The operation requires the movement of the temperature probes (see par. 2.5 letter “T”) and a check of the correct parameterisation of the control unit. This operation must be carried out by qualified personnel. For more information and before making any changes, contact Rinnai. -
Page 31: Maintenance Instructions
3. MAINTENANCE INSTRUCTIONS The following section provides specific instructions for proper maintenance of the product. This section is intended for the use by qualified technical personnel. -
Page 32: Maintenance Of The Appliance
Failure to flush the appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the water heater’s warranty. Rinnai strongly recommends installation of isolation valves to allow for flushing of the heat exchanger. - Page 33 Non condensing models: The REU-VCM3837FFUD generator installed on Rinnai Demand Duo can show a code like “LC #” (LC1, LC2, ...) on the connected display. In this case, the heat exchanger washing procedure must be carried out because the sensors have identified the presence of scale deposits.
- Page 34 Storage maintenance Cathodic protection: electronic anode The Rinnai Demand Duo storage tank is equipped with an electronic protection anode. In order to reach and maintain the appropriate protection potential in the shortest possible time, the regulation of the impressed current is automatic, according to the characteristics and dynamic behavior of the storage tank.
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Page 35: Technical Data
3.4 TECHNICAL DATA MODEL REU-DD300N26-0B REU-DD300N26-0A REU-DD300N26-1B UNIT Appliance type Condensing storage water heater Installation Internal G20 Nat Gas min gas pression -0.10 mbar G230 Air/Propane min gas pression -0.10 mbar G30 Butane min gas pression -0.10 mbar G31 Propane min gas pression -0.10 mbar Flue system... - Page 36 MODEL REU-DD300N32-0B REU-DD300N32-0A REU-DD300N32-1B UNIT Appliance type Condensing storage water heater Installation Internal G20 Nat Gas min gas pression -0.10 mbar G230 Air/Propane min gas pression -0.10 mbar G30 Butane min gas pression -0.10 mbar G31 Propane min gas pression -0.10 mbar Flue system...
- Page 37 MODEL REU-DD300VCM28-0B REU-DD300VCM28-0A REU-DD300VCM28-1B UNIT Appliance type Storage water heaters Installation Internal G20 Nat Gas min gas pression 1,57 mbar G230 Air/Propane min gas pression 1,88 mbar G30 Butane min gas pression 2,14 mbar G31 Propane min gas pression 2,14 mbar Flue system Forced flue, sealed room...
- Page 38 MODEL REU-DD500VCM28-0B REU-DD500VCM28-0A REU-DD500VCM28-1B UNIT Appliance type Storage water heaters Installation Internal G20 Nat Gas min gas pression 1,57 mbar G230 Air/Propane min gas pression 1,88 mbar G30 Butane min gas pression 2,14 mbar G31 Propane min gas pression 2,14 mbar Flue system Forced flue, sealed room...
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Page 39: Product Fiche
3.5 PRODUCT FICHE U.M. Supplier’s name Rinnai Italia srl Supplier’s model REU-DD300N26-0B Load profile Water heating energy efficiency class Water heating energy efficiency (ƞwh) 76.2 Mixed water at 40°C Annual electricity consumption (AEC) kWh/annum Annual fuel consumption (AFC) - (Hs) - Page 40 U.M. Supplier’s name Rinnai Italia srl Supplier’s model REU-DD300N32-0A Load profile Water heating energy efficiency class Water heating energy efficiency (ƞwh) 78.3 Mixed water at 40°C Annual electricity consumption (AEC) kWh/annum Annual fuel consumption (AFC) - (Hs) GJ/annum Temperature factory setting of the thermostat 1 °C...
- Page 41 U.M. Supplier’s name Rinnai Italia srl Supplier’s model REU-DD300VCM28-1B Load profile Water heating energy efficiency class Water heating energy efficiency (ƞwh) 64.3 Mixed water at 40°C Annual electricity consumption (AEC) kWh/annum Annual fuel consumption (AFC) - (Hs) GJ/annum Temperature factory setting of the thermostat 1 °C...
- Page 44 Rinnai Italia S.r.l. Via Liguria, 37 - 41012 Carpi, Modena Tel +39 059 622 9248 info@rinnai.it rinnai.it...
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