INTERNAL (INDOOR) MODELS: EXTERNAL (OUTDOOR) MODELS: CU199i (REU-N3237FFC-US) CU160i (REU-N2530FFC-US) CU199e (REU-N3237WC-US) CU160e (REU-N2530WC-US) C US ANSI Z21.10.3 ● CSA 4.
WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. • Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. • WHAT TO DO IF YOU SMELL GAS – Do not try to light any appliance. – Do not touch any electrical switch; do not use any phone in your building. – Immediately call your gas supplier from a neighbor’s phone.
Contents 1. Welcome........................................................................................................................................... 5 2. Safety................................................................................................................................................ 6 3. 4. 2.1 Safety Symbols........................................................................................................................ 7 2.2 Safety Precautions.................
6. 5.5 Performance Data..................................................................................................................75 5.6 Diagnostic Codes...................................................................................................................77 Maintenance................................................................................................................................... 80 7. 6.1 Maintenance..............................................................
1. Welcome Thank you for purchasing a Rinnai Tankless Water Heater. Before installing and operating this water heater, be sure to read these instructions completely and carefully to familiarize yourself with the water heater’s features and functionality. To The Installer • It is recommended that a licensed professional install the appliance, inspect it, and leak test it before use. The warranty may be voided due to any improper installation.
2. Safety WARNING AVERTISSEMENT • If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. • Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. • WHAT TO DO IF YOU SMELL GAS: – Do not try to light any appliance. – Do not touch any electrical switch; do not use any phone in your building.
2.1 Safety Symbols WARNING CAUTION Indicates an imminently hazardous situation which, if not avoided, will result in personal injury or death. Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It may also be used to alert against unsafe practices. Safety alert symbol. Alerts you to potential hazards that can kill or hurt you and others.
– Use only your hand to turn the manual gas control valve. Never use tools. If the manual gas control valve will not turn by hand, do not try to repair it; call a trained and qualified professional. Force or attempted repair may result in a fire or explosion. • Do not use this appliance if any part has been under water. Immediately call a trained and qualified professional to inspect the appliance and to replace any part of the control system and any manual gas control valve which has been under water.
3. About the Water Heater Topics in this section • Front View • Bottom View • Components • Specifications • Dimensions • Accessories 3.
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3.4 Specifications Table 2: Specifications Internal (Indoor) Units CU199i CU160i CU199e Minimum Gas Consumption Btu/h Maximum Gas Consumption Btu/h Flow Rate1 (Min-Max) Max Flow Rate with Parameter Adjustment Weight Sound Level Normal Freeze Protection CU160e 15,000 199,000 160,000 199,000 160,000 0.26-9.8 GPM (1.0-37 L/min) 0.26-8.0 GPM (1.0-30 L/min) 0.26-9.8 GPM (1.0-37 L/min) 0.26-8.0 GPM (1.
3.5 Dimensions Measurements: in. (mm) Internal (Indoor) Models (CU199i, CU160i) Vent Connection: Front Panel View Side Panel View Front Panel View Side Panel View 2 in. (51 mm) nominal PVC/Polypropylene or 3 in./5 in. Concentric.
3.5.1 Supply Connections Cold Inlet Pressure Relief Valve 2.8 (71) 3.5 (89) Hot Outlet 5.25 (133) 6.2 (157) 7.6 (193) Condensate Drain .59 (15) .36 (9) 5.6 (142) 1.22 (31) Gas 5.10 (129) 7.75 (197) Figure 6: Supply Connections Table 3 Connection 14 Connection Size Gas 3/4 in. NPT Cold Inlet 3/4 in. NPT Hot Outlet 3/4 in. NPT Condensate Drain 1/2 in.
3.6 Accessories Numerous optional accessories are available for purchase for your Rinnai Tankless Water Heater. Listed below are some commonly purchased accessories. For a complete list of accessories, visit www.rinnai.us. For questions, or to purchase an accessory, contact your local Rinnai dealer/distributor or Rinnai Customer Care at 1-800-621-9419. Table 4: Accessories Product Product Description Room Air Screen Part #: 108000105 Recommended room air screen for use in room air applications only.
Product Product Description Recirculation Pump Part #: RWMGTK03 A pump system can be incorporated with Rinnai Circ-Logic recirculation technology in a dedicated recirculation system. Cascade Cable Part #: REU-CSA-C1 REU-CSA-C2 Electronically connects up to 24 water heaters and enables them to function as one hot water source. Note: One cable is needed for each water heater.
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DO NOT – Tankless Water Heater Installation and Operation Manual (this manual) • DO NOT install the following internal (indoor) water heaters outdoor: CU199i or CU160i. • DO NOT install the following external (outdoor) water heaters indoor: CU199e or CU160e. • DO NOT install the water heater in an area where water leakage of the unit or connections will result in damage to the area adjacent to the appliance or to lower floors of the structure.
4.3 Choose an Installation Location When selecting an installation location, you must ensure that clearances will be met and that the vent length will be within required limits. Consider the installation environment, water quality, and need for freeze protection. Requirements for the gas line, water lines, electrical connection, and condensate disposal can be found in their respective installation sections in this manual. 4.3.
4.3.3 Internal (Indoor) Water Heaters • Install the water heater as far away as possible from any air inlet vents. Corrosive fumes, sometimes found in hair/ nail salons, spas, or other industries exposed to toxic fumes, may be released through these vents when not in operation. Chemicals that are corrosive in nature should not be stored or used near the water heater or vent termination. This requirement applies to internal (indoor) and external (outdoor) water heater.
4.3.5 Freeze Protection Make sure that in case of freezing weather the water heater and its water lines are protected to prevent freezing. Damage due to freezing is not covered by the warranty. When connected to gas and a 120-volt power supply, the water heater will not freeze when the outside air temperature is as cold as -22°F (-30°C) for internal (indoor) models or -4°F (-20°C) for external (outdoor) models, when protected from direct wind exposure.
4.3.6 Clearances Internal (Indoor) Models External (Outdoor) Models Top Front Top Side Front Bottom Side Bottom Figure 8: Clearances Table 6 Location Top Clearances to Combustibles and Non-Combustibles 2 in. (51 mm) 0 in. from vent components Bottom/Ground 12 in. (305 mm) Front 0 in. Clearance for servicing is 24 in. (610 mm) in front of water heater Back 0 in. Sides (Left and Right) 2 in. (51 mm) Add 0.25 in. (6.35 mm) for recess box Vent 0 in.
4.3.7 Installation Location Checklist Use this checklist to ensure you have selected the correct location for the water heater. □ □ □ The water heater is not exposed to corrosive compounds in the air. □ The water supply does not contain chemicals or exceed total hardness that will damage the heat exchanger. □ A standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet (for internal/indoor models) or other 120 VAC, 60 Hz source is available.
4.4 Mount the Water Heater to the Wall 4.4.1 Mount the Internal (Indoor) Water Heater You Will Need: 3. Insert the top bracket into the wall mounting bracket. Make sure the wall mounting bracket is attached to the wall and can hold the weight of the boiler before you fully let go. • Rinnai Tankless Water Heater (Internal/Indoor Model) • Wall Mounting Bracket Supplied by Installer: • Level • 4 Screws for mounting bracket installation Use appropriate screws for type of wall constructions.
4. Securely screw the top and bottom brackets into the wall, making sure the screws are flush with the wall. • Use any of the holes in the top and bottom brackets. • Make sure the securing method is sufficient to support the weight of the water heater. Refer to the water heater weight in section “3.4 Specifications.” IMPORTANT The water heater must be installed in an upright position. Do not install the water heater upside down or on its side. Top Bracket 4.4.
4.5 Vent the Water Heater • Refer to the instructions of the vent system manufacturer for component assembly instructions. 4.5.1 Guidelines • Internal water heaters can be installed as direct vent or non-direct vent applications. • When installed as Direct Vent, refer to the “Direct Vent Approved Vent Manufacturers and Products” section (within section “4.5.4. 1. Direct Vent”) for a complete list of approved vent manufacturers and products.
4.5.2 Venting Installation Sequence 4.5.3 Termination Considerations 1. Install the water heater. Check to determine whether local codes supersede the following clearances: 2. Determine the termination method— horizontal or vertical, concentric, or twin pipes, etc. 3. Determine proper location for wall or roof penetration for each termination. 4. Install termination assembly as described in this manual or in the vent manufacturer’s installation instructions. 5.
4.5.4 Venting Options Three types of venting options are available: 1. Direct Vent (Concentric Pipe and Twin Pipe) Concentric Pipe Twin Pipe Combustion air and exhaust vent directly through a single concentric connection. Hot exhaust exits through the interior tube, while combustion air enters through the outer layer. Combustion air and exhaust vent directly through separate penetrations. Figure 15: Concentric Pipe 2.
1. Direct Vent (Concentric Pipe and Twin Pipe) Direct Vent Approved Vent Manufacturers and Products Following is a list of vent components and terminations for Direct Vent installations. Install the correct venting for your model according to the venting manufacturer’s instructions and the guidelines below. The information below is correct at time of publication and is subject to change without notice.
Equivalent Length (ft) Vertical Horizontal Diagram (Concentric Pipe and Twin Pipe) Product Description Manufacturer Part number Manufacturer 1. Direct Vent 52CVKGS6502 PVC Concentric Vent Kit 2 in. x 16 in. 20 52CVKGVS6502-28 PVC Concentric Vent Kit 2 in. x 28 in. 20 52CVKGVS6502-40 PVC Concentric Vent Kit 2 in. x 40 in. 20 ICRT2439 2 in. x 4 in. Concentric Roof Termination 20 2PPS-VKL/VK-TCL 2 in. x 4 in. Vertical Termination Cap KitConcentric 20 2PPS-HKL 2 in. x 4 in.
Equivalent Length (ft) Vertical Horizontal Product Description Manufacturer Diagram (Concentric Pipe and Twin Pipe) Manufacturer Part number 1. Direct Vent CENTRO THERM HEAT-FAB ROYAL IPEX UBBINK 3 in. /5 in. CONCENTRIC VENT TERMINATIONS 223176PP 223177PP 3/5 Condensing Horizontal Termination Kit 12 in. 3/5 Condensing Horizontal Termination Kit 21 in. 5 223186PP 3/5 Condensing Horizontal Diverter Termination Kit 19 in.
Equivalent Length (ft) Vertical Horizontal Product Description Manufacturer Diagram (Concentric Pipe and Twin Pipe) Manufacturer Part number 1. Direct Vent 3CGRLSV Vertical Adapter 1 3CGRLSH Horizontal Adapter 6 3CGRVT Vertical Termination 5 3CGRHT 3 in. x 5 in. Vertical Termination Cap KitConcentric 16 3PPS-VKL/VK-TCL 3 in. x 5 in. Vertical Termination Cap KitConcentric 20 3PPS-HKL 3 in. x 5 in. Horizontal Termination KitConcentric 20 190388 3 in. x 5 in.
Equivalent Length (ft) Vertical Horizontal Product Description Manufacturer Diagram (Concentric Pipe and Twin Pipe) Manufacturer Part number 1. Direct Vent DURAVENT CENTROTHERM 2 in. TWIN PIPE TERMINATIONS ISELL0287UV 2 in. 87° Long PPS-UV 6 ISTT0220 2 in. Termination Tee 6 ISLPT0202 2 in. Low Profile Wall Termination 5 2PPS-HTPL 2 in. Twin Pipe Termination 10 2PPS-HSTL 2 in. Single Horizontal Termination 6 2PPS-TBL 2 in.
Equivalent Length (ft) Vertical Horizontal Product Description Manufacturer Diagram (Concentric Pipe and Twin Pipe) Manufacturer Part number 1. Direct Vent DURAVENT CENTROTHERM 3 in. TWIN PIPE TERMINATIONS ISELL0387UV 3 in. 87° Long PPS-UV 6 ISTT0320 3 in. Termination Tee 6 ISLPT0303 3 in. Low Profile Wall Termination 5 3PPS-HTPL 3 in. Twin Pipe Termination 10 3PPS-HSTL 3 in. Single Horizontal Termination 5 3PPS-TBL 3 in.
Equivalent Length (ft) Vertical Horizontal Diagram Product Description Table 9: Various 2 in. or 3 in. Schedule 40 PVC/CPVC Terminations Vent Screen N/A Tee 5 90° Elbow 5 45° Elbow 2.
4.5.5 Direct Vent (Concentric and Twin Pipe): Termination Clearances The information below applies to Concentric and Twin Pipe. TERMINATION TERMINATION X SUPPLY INLET XAIRAIR SUPPLY INLET VENT TERMINAL V VVENT TERMINAL Clearance in Clearance in Ref. ARef.
1. Direct Vent (Concentric Pipe) Exhaust Concentric Pipe Overview Combustion air and exhaust vent directly through a single concentric connection. Hot exhaust exits through the interior tube, while combustion air enters through the outer layer. Concentric Pipe Termination Clearances Combustion air Combustion air Figure 23: Concentric Pipe 60 in. (1.52 m) Note: 24 in. (0.61 m) to wall or parapet 12 in. (0.30 m) 12 in. (0.30 m) 60 in. (1.
Concentric Pipe: Installation Instructions Mount Concentric Pipe Through Wall 1. Remove and discard screw from concentric flue connection. If venting through an exterior wall, align the wall mounting bracket template (located in literature bag) to the wall and follow instructions on the template for appropriate vent hole location. Use a level to make sure the wall mounting bracket is even and level. Figure 26 2. Remove exhaust adapter ring (discard for concentric venting configurations.
1. Direct Vent (Twin Pipe) Twin Pipe Overview Combustion air and exhaust vent directly through separate penetrations. Figure 31 Twin Pipe Termination Clearances Intake 12 in. (0.30 m) minimum 12 in. (0.30 m) minimum Exhaust 60 in. min 12 in. (0.30 m) minimum above combustion air opening Combustion Air 12 in. (0.30 m) above grade or anticipated snow level Roof Figure 32: Twin Pipe Vertical Termination of Multiple Water Heaters Exhaust 12 in. min 12 in. min 12 in. min 12 in. min Intake 12 in.
1. Direct Vent (Twin Pipe) Twin Pipe Installation Instructions The water heater is equipped with a 2 in. (51 mm) pipe connection. With the use of a pipe reducer, installers can use a 3 in. (76 mm) pipe for the combustion air and exhaust. 3. Install the combustion air vent pipe. Ensure it is properly seated. Secure the combustion air vent pipe to the combustion air vent connection with the supplied screw.
1. Direct Vent (Twin Pipe) Twin Pipe Example Vent Applications Slope horizontal exhaust 1/4 in. per foot towards the water heater. DO NOT slope combustion air pipe towards the water heater. Table 15 This configuration requires the use of a Concentric Vent Termination 2 in. or 3 in. PVC/ CPVC IPEX/ Royal Concentric Side Wall Termination Configuration This configuration requires the use of a Concentric Vent Termination 2 in. or 3 in. PVC/CPVC IPEX/ Royal Concentric Vertical Termination Configuration 2 in.
2. Non-Direct Vent (Room Air and External) Room Air and External Termination Clearances TERMINATION TERMINATION X X AIR SUPPLY INLET AIR SUPPLY INLET V VENT TERMINAL V VENT TERMINAL Clearance in Clearance in Ref. A also Ref.
NOTE • Installation of Non-Direct Vent (Room Air) must use listed category IV venting. • All terminations (horizontal and/or vertical) must terminate 12 in. above grade or anticipated snow level. Termination Clearances for External (Outdoor) Water Heaters 2 in. 36 in. (0.91 m) to ventilated or unventilated soffit or eve vent; or to a deck or porch 12 in. (0.30 m) 60 in. (1.
Room Air: Combustion Air This water heater requires adequate combustion air for ventilation and dilution of flue gases. Failure to provide adequate combustion air can result in unit failure, fire, explosion, serious bodily injury or death. Use the following methods to ensure adequate combustion air is available for correct and safe operation of this water heater. WARNING IMPORTANT Combustion air must be free of corrosive chemicals. Do not provide combustion air from corrosive environment.
Louvers and Grills Adequate combustion air is required for all gas utilizing equipment in the location. Therefore, proper sizing of permanent openings, such as louvers or grills, must be considered to maintain the required free area. If the free area of the louver or grill design is not available, assume wood louvers will have 25% free area and metal louvers or grills will have 75% free area. Under no circumstance should the louver, grill or screen have openings smaller than 1/4 in.
Room Air: Installation Instructions 1. Remove and discard screw from combustion air vent connection (Figure 42). Figure 42 2. Remove and discard the combustion air vent cap (Figure 43). Figure 43 3. Install the combustion air vent pipe. Ensure it is properly seated. Secure the combustion air vent pipe to the combustion air vent connection with the supplied screw (Figure 44). Combustion Air Vent Pipe Supplied screw Figure 44 4.
Room Air: Example Vent Applications Table 18 2 in. or 3 in. Schedule 40 PVC/CPVC or ABS Snorkel Termination Configuration 2 in. or 3 in. Schedule 40 PVC/CPVC or ABS Standard Upside Down “U” Vertical Termination Configuration 2 in. or 3 in. Schedule 40 PVC/CPVC or ABS Elbow or Tee Side Wall Termination Configuration 2 in. or 3 in. Schedule 40 PVC/CPVC or ABS Tee Vertical Termination Configuration Ubbink flexible venting approved for vertical non-direct vent (room air) applications only.
3. Common Vent (Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent) Common venting allows multiple Rinnai Tankless Water Heaters to share the same vent system. Rinnai water heaters can only be common vented with Schedule 40 PVC/CPVC or with the Rinnai certified common vent system. Figure 47: Example: Rinnai Common Venting General Guidelines When installing common vent, follow these guidelines: • Use only the materials listed in this manual for vent, air intake pipe, and fittings.
Common Vent Maximum Equivalent Vent Lengths (Rinnai Common Vent System or Schedule 40 PVC/CPVC) Common vent equivalent lengths include polypropylene pipe (PP) or PVC in a back-to-back or inline configuration. For the table below: Vent Length Header • Header is the main vent pipe into which several vents connect. • Vent Length is the distance from the end of the header to the vent termination. • Maximum vent length starts at the end of the header system. • Use 10 ft.
Common Vent Terminations Tee Equivalent Length (ft) Diagram Horizontal Product Description Vertical Table 21: Various 3 in., 4 in., and 6 in. Schedule 40 PVC/CPVC Terminations 10 90° Elbow 10 45° Elbow 5 50 Ubbink 800-621-9419 www.rinnai.us Equivalent Length (ft.) Web Site Vertical Phone Diagram Manufacturer Horizontal Table 22: Rinnai Common Vent Terminations (Ubbink C-Vent) Part Number Product Description 790096 790095 CVent Roof Termination 6 in. CVent Roof Termination 4 in.
Schedule 40 PVC/CPVC Common Vent Guidelines WARNING PVC solvents (primer and glue) can be extremely flammable. Vapors may cause a flash fire or explosion resulting in property damage, personal injury or death. • Keep solvents away from heat, sparks, flames and all other sources of ignition. • Do not solder, cut or weld until all vapors have dissipated. • PVC solvents are heavier than air causing them to settle at low points of the system. • Before Using PVC solvent – Disconnect power to the water heater.
Connecting Multiple Water Heaters (Cascade Communication) With use of cascade cable(s) up to 24 water heaters can be electronically connected. This connection will rotate water heater operation order to ensure equal usage among the entire system and enables all water heaters connected to modulate operation and function as one hot water source. NOTE: For proper operation, do not combine different models with cascade communication.
Programming Cascade Communication Parameter Settings (Cascade Communication) Refer to the parameter setting section of this manual for instructions on how to access and change parameter settings. Table 24 Setting # Setting Description 08 Cascade 09 Units in Standby (Cascade) Selection A C Secondary (2-23) Primary 1 2 3 4 E F 5 6 08 Cascade: Primary: Select the water heater intended to be the Primary water heater for cascade communication.
4.6 Connect Water Supply 4.6.1 Guidelines • The piping (including soldering materials) and components connected to this appliance must be approved for use in potable water systems. • Purge the water line to remove all debris and air. Debris will damage the water heater. • The appliance must not be connected to a system that was previously used with a non-potable water heating appliance. • Ensure that the water filter on the water heater is clean and installed.
4.7 Install the Isolation Valves Isolation valves (included with water heater) provide the ability to isolate the water heater from the structure’s plumbing and allow quick and easy access to flush the heat exchanger. The supplied isolation valves meet American National Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3) and are ANSI/NSF 61 approved for potable water. 4.7.1 Instructions 1. Position the Hot Isolation Valve (Red) below the Hot Outlet side of the water heater. 2.
4.8 Install Pressure Relief Valve WARNING Water discharged from the pressure relief valve could cause severe burns instantly or death from scalds. 4.8.1 Guidelines An approved pressure relief valve is required by the American National Standard (ANSI Z21.10.3) for all water heating systems and shall be accessible for servicing.
4.8.2 Instructions To install the pressure relief valve, follow the steps below. 1. On the bottom of the tankless water heater, hand tighten the Pressure Relief Valve Assembly and Gasket to the Pressure Relief Valve Union Fitting. 2. Rotate the Pressure Relief Valve Assembly to the desired accessible position. With a wrench, tighten the Union Nut to the Pressure Relief Valve Union Fitting.
4.9 Connect Condensate Drain 4.9.1 Guidelines To prevent condensate damage, follow these guidelines: • Do not plumb the condensate drain with the pressure relief valve; both must be plumbed independently to drain. • All condensate must drain and be disposed of according to local codes. • Use only corrosion resistant materials for the condensate drain lines such as PVC pipe or plastic hose. • The condensate drain pipe (along its entire length) must be at least the same diameter as the drain line (1/2 in.
4.9.2 Instructions 3. Cut crimp connectors off white wires and strip the insulation off of the two ends. To connect the condensate drain pipe: 4. Select an appropriate length of wire (18 AWG or greater) and strip the insulation off the ends. Follow the wiring guidelines established by the National Electrical Code (NEC). 1. Apply thread sealant to 1/2 in. MNPT condensate drain port. 2. Thread 1/2 in. NPT fitting onto condensate drain port. 3.
Condensate Pump Safety Switch Installation Tankless Water Heater Wire Nut Connecting Two Wires To Condensate Pump Safety Switch Wires Installer-Supplied Wires p m ate Pu dens To Con Switch Safety Safety Switch Wires* Condensate Pump (installer-supplied) Includes internal safety switch and power cord. Power cord must be plugged into power source. * Safety switch wires connect to the NO and COM contacts on the safety switch.
4.10 Connect the Gas Supply WARNING • A licensed professional must install the gas supply. • Turn off 120V power supply. • Turn off the gas. • Gas is flammable. Do not smoke or provide other ignition sources while working with gas. • Do not turn on the water heater or gas until all fumes are gone. 4.10.1 Instructions To connect the gas supply, follow the instructions below: 1. Install a manual gas control valve in the gas supply line to the water heater.
4.10.2 Gas Pipe Sizing Reference Tables The gas supply must be capable of handling the entire gas load required at the location. Gas line sizing is based on gas type, the pressure drop in the system, the gas pressure supplied, and gas line type. For gas pipe sizing, refer to the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installation Code, CSA B149.
Natural Gas Table 28: Pressure Drop 3.0 in. wc Intended use: Initial supply pressure of 8.0 in. wc or greater. Information in table obtained from NFPA 54, ANSI Z223.1 - 2021. Length in ft (meters) Schedule 40 Metallic Pipe Inlet Pressure: Specific Gravity: Less than 2 psi 0.
4.11 Connect the Power Supply WARNING • Do not use an extension cord or adapter plug with this appliance. • The water heater must be electrically grounded in accordance with local codes and ordinances or, in the absence of local codes, in accordance with the National Electrical Code, ANSI/ NFPA No. 70. • Indoor water heaters are equipped with a three-prong (grounding) plug for your protection against shock hazard and should be plugged directly into a properly grounded three-prong receptacle.
4.12 Configure Parameter Settings 4.12.1 Instructions WARNING DO NOT adjust parameter settings unless specifically instructed to do so. Certain elements of the installation may require adjusting the parameters of the tankless water heater. To adjust the parameters: 1. Locate the PC Board (lower right side of unit). 2. Locate the two push buttons (A and B) on the PC Board. 3. Press the “A” button for 1 second. A B Figure 66 4.
Table 32: Parameter Settings Table Default is A for all settings below except 10, 13, and 14 which are factory set. SETTING # SETTING DESCRIPTION SELECTION c 01 Maximum Set Temperature 140°F 185°F 02 High Altitude Installation Location 0 - 2,000 ft (0 - 610 m) 2,001 - 5,400 ft (610 - 1,585 m) 03 Service Soon1 Disabled 0.
4.13 External Pump with Circ-Logic Rinnai SENSEI™ Tankless Water Heaters include Circ-Logic technology that offers the comfort and convenience of instant hot water with the use of an external recirculation pump. Circ-Logic controls the on/off sequence and operation cycles of the external recirculation pump through the programming of the tankless water heater’s parameter settings. In commercial settings, the external pump cable is not included with the tankless water heater and must be purchased separately.
4.14 Post-Water Heater Installation Checklist Complete the following checklist when water heater installation is complete. You should be able to answer YES to each question. If you answer NO to any question, installation is not complete. Refer to the applicable section in the Rinnai Tankless Water Heater Installation and Operation Manual for additional information. For assistance, contact your local dealer or distributor, or call Rinnai Customer Care at 1-800-621-9419.
Is the discharge line from the PRV pitched downward and does it terminate 6 in. (152 mm) above the drains? Is the discharge end of the line plain (unthreaded) and a minimum of 3/4 in.
5. Operation Topics in this section • • • • • AVERTISSEMENT Safety Precautions Start-up Information Control Panel Basic Operation Settings Diagnostic Codes Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matériel, toute blessure ou la mort. • Ne pas entreposer ni utiliser d’essence ou ni d’autres vapeurs ou liquides inflammables à proximité de cet appareil ou de tout autre appareil. 5.
• Keep the area around the appliance clear and free from combustible materials, gasoline, and other flammable vapors and liquids. • Do not use this appliance if any part has been under water. Immediately call a licensed professional to inspect the appliance and to replace any part of the control system and any gas control which has been under water. (N’utilisez pas cet appareil s’il a été plongé dans l’eau, même partiellement.
5.2 Operating Instructions FOR YOUR SAFETY READ BEFORE OPERATING WARNING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand. B. BEFORE OPERATING, smell all around the appliance area for gas.
5.3.2 Locking the Controller 5.3 Control Panel The controller panel allows you to adjust the water temperature, lock the controller on a set temperature, and view diagnostic information. 1. To lock the internal controller, press and hold down the “Priority” button. 2. While holding down the “Priority” button, press the (Up) button until a beep is heard (approximately 5 seconds). Then, release both buttons at the same time. 3. appears in the display indicating the controller is locked.
5.4 Setting the Temperature IMPORTANT This water heater requires a minimum flow rate to operate. This rate can be found on the specification page in this manual. In some cases when you are not getting hot water or if the water alternates between hot and cold, it is due to the water flow being below or close to the minimum flow rate. Increasing the flow rate should resolve these problems in these cases. If you are experiencing issues with higher temperature settings, then reduce the temperature setting.
5.4.1 Available Temperatures with an Internal Controller The water heater can deliver water at only one temperature setting at a time. The available temperatures are provided below. A temperature lower than 98°F (37°C) can be obtained at the tap by mixing with cold water. To change the temperature scale from Celsius to Fahrenheit or vice versa, press and hold the “On/Off” button on the controller for 5 seconds while the water heater is OFF.
Table 36: Performance Data Table # 01 Data Unit Water Flow Rate x0.1 gal/min 02 Outgoing Temperature °F 03 Combustion Hours x100 Hours 04 Combustion Cycles * 05 Fan Frequency Hz 06 Additional Controllers Connected * 07 Water Flow Control Position 0=Mid 1=Open 2=Closed 08 Inlet Temperature °F 09 Fan Current x10 mA 10 Total Bath Fill Amount Gallons 11 HEX Outlet Temp.
5.6 Diagnostic Codes To display diagnostic codes: Turn off the water heater by pressing the “On/Off” button. Press and hold the “On/Off” for 2 seconds and then the (Up) button simultaneously. The last nine maintenance codes display and flash one after the other. To exit diagnostic codes and return the water heater to normal operation, press and hold the “On/Off” button for 2 seconds and then the (Up) button simultaneously. Turn on the water heater by pressing the “On/Off” button.
15 16 17 Venturi Control • Ensure the Venturi motor is operating correctly.* • Replace gas valve assembly. • Clear diagnostic code by resetting the main power supply to the water heater. 51 High Outgoing Temperature (safety shutdown because water heater is too hot) • Confirm fan motor is functioning correctly. • Replace the gas valve assembly. 52 Gas Valve • • First, follow the recommended solutions for Diagnostic Code 10.
71 Solenoid Valve Circuit • • • • NO CODE - Nothing happens when water flow is activated Ensure dip switch on PC board is in the OFF position. Ensure gas control wire is not loose or damaged. Ensure heater circuit is not grounded. Replace PC Board. 72 Flame Rod • • Check flame rod and wire for damage. Verify HEX is not leaking. FF Maintenance Indicator • Placeholder in Diagnostic code history indicating that a service provider performed maintenance or service.
6. Maintenance The following maintenance items are required for the proper operation of your water heater. Topics in this section • • • • 6.1 Maintenance Cleaning and Inspecting the Air Filter (Indoor Units Only) Flushing the Heat Exchanger Draining the Water Heater Maintenance This water heater must be inspected annually by a licensed professional. Repairs and maintenance shall be performed by a licensed professional. The licensed professional must verify proper operation after servicing.
MOTORS Motors are permanently lubricated and do not need periodic lubrication. However you must keep fan and motor free of dust and dirt by cleaning annually. TEMPERATURE CONTROLLER Use a soft damp cloth to clean the temperature controller. Do not use solvents. LIME/SCALE BUILD-UP Scale build-up is caused by hard water and can be accelerated if the water heater is set at a high temperature. Refer to section “6.3 Flushing the Heat Exchanger” for more information.
Gas UNSATISFACTORY Shut off the gas to the water heater. It is generally preferable to shut off the gas service to the entire location if gas is not going to be used. FRONT VIEW Water Flame Rod Figure 81 Yellow Flame FREEZE PROTECTION Make sure in case of freezing weather that the water heater and its water lines are adequately protected to prevent freezing. Damage due to freezing is not covered by the warranty. Refer to the “Freeze Protection” section (Section 4.
NOTE Do not operate this water heater if the air filter is not in place. Figure 82 CLEANING 1. Power OFF the water heater • Push the “On/Off” button located on the right-hand side of the controller. The display will go blank when the power is off. 2. Remove the front panel. • Remove the four screws securing the front panel. • Remove the front panel and locate the filter at the upper right-hand corner of the water heater. • Remove the air filter by pulling out the “FILTER Pull to Clean” tab 3.
6.3 Flushing the Heat Exchanger This water heater includes a service indicated/ reminder (Service Soon, SS). When selected in the parameter settings, an SS code will display on the controller indicating that it is time to flush and service the water heater. 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.
6.4 Draining the Water Heater WARNING To avoid burns, wait until the equipment cools down before draining the water. The water in the appliance will remain hot after it is turned off. If the water heater is not going to be used during a period of possible freezing weather, it is recommended that the water inside the water heater be drained. To manually drain the water: 1. Shut off cold water supply and gas supply. 2. Turn off the temperature controller. 3. Disconnect the power to the water heater. 4.
7. Appendices Topics in this section • • • • • 7.1 Massachusetts State Gas Regulations Wiring Diagram Ladder Diagram Pressure Drop and Water Flow Curves Guidelines for Additional Temperature Controllers Massachusetts State Gas Regulations For Gas Models Sold in Massachusetts NOTICE BEFORE INSTALLATION: This direct-vent appliance must be installed by a properly trained licensed professional. If you are not properly trained, you must not install this unit.
Check Valve Figure 86 Tempered water to plumbing fixtures. Must meet temperature requirements of 248 CMR. Min. 2' developed length Type L copper from water heater Product Approved Water Heater Automatic Tempering Device Must be installed below the top of the water heater as per manufacturer's recommendations. Cold Water Supply Shut Off Valve Check Valve with 1/8in.
Figure 87 PC BOARD 7.
7.
7.4 Pressure Drop and Water Flow Curves CU199 Presure Loss (ft of Head) Pressure Loss (PSI) CU160 Dashed lines represent flow rate after parameter adjustment. Figure 89 Water Flow (GPM) The chart below applies only to incoming water temperatures of 70°F (21°C) or less. For incoming water temperatures greater than 70°F (21°C), please contact Rinnai. NOTE: Maximum flow rates may vary based on set temperature, Delta T and altitude.
7.5 Guidelines for Additional Temperature Controllers All Rinnai Tankless Water Heaters are equipped with an integrated digital temperature controller that allows for a precise water temperature setpoint. Additional digital temperature controllers are available as accessories and must be purchased separately (detailed installation steps included with purchase). Wiring Cable Lengths and Sizes The temperature controller cable should be a nonpolarized two-core cable with a minimum gauge of 22 AWG.
8. Warranty What is Covered? The Rinnai Standard Limited Warranty covers any defects in materials or workmanship when the product is installed and operated according to Rinnai written installation instructions, subject to the terms within this Limited Warranty document. This Limited Warranty applies only to products that are installed correctly in the United States and Canada. Improper installation may void this Limited Warranty.
What Is Not Covered? This Limited Warranty does not cover any failures or operating difficulties due to the following: • • • • • • • • • • • • • • • • • Accident, abuse, or misuse Alteration of the product or any component part Misapplication of this product Improper installation (such as but not limited to) Product being installed in a corrosive environment Condensate damage Improper venting Incorrect gas type Incorrect gas or water pressure Absence of a drain pan under the appliance Improper maintenance
Notes 94 Rinnai Tankless Water Heater Installation and Operation Manual
Notes Rinnai Tankless Water Heater Installation and Operation Manual 95
Place Model/Serial # Label Here Located in Manual Bag Rinnai America Corporation 103 International Drive Peachtree City, GA 30269 Tel: Web: 1-800-621-9419 rinnai.us rinnai.
