For Indoor Commercial Applications Only: This product is NOT intended for residential applications. CHS398100HiN ....... 119 Gallon, 398,000 BTU CHS398100HiP . ...... 119 Gallon, 398,000 BTU CHS320100HViN . ... 119 Gallon, 320,000 BTU CHS320100HViP . ... 119 Gallon, 320,000 BTU CHS398100HViN . ... 119 Gallon, 398,000 BTU CHS398100HViP . ... 119 Gallon, 398,000 BTU CHS398100HVAiN .. 119 Gallon, 398,000 BTU CHS398100HVAiP ..
Example: CHS199100HVAiN CHS 199 100 H V A i N/P Commercial Hybrid System (Demand Duo) Max KBTU Input (398, 320, 199, 160, 130) Tank Capacity (119, 80) Series (H=High Efficiency, R=Regular Efficiency) Special Designation (V=Vertical, A=ASME Tank) Indoor (all models) Gas Type (NG or LPG) WARNING • • • If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death.
1. Welcome ....................................................................................................................... 4 2. Safety............................................................................................................................ 5 2.1 Safety Symbols ....................................................................................................... 5 2.2 Safety Precautions ...............................................................................................
Thank you for purchasing Rinnai’s Demand Duo™ 2 Commercial Hybrid Water Heating System. This manual provides information on the installation, operation, and maintenance of the system. Read this manual completely before installing or operating the system. This manual is a supplement to the Installation and Operation Manual for Commercial CU199 and CU160 Condensing Tankless Water Heaters; refer to the CU199/CU160 manual for complete water heater information.
Topics in this section • Safety Symbols • Safety Precautions This manual contains the following important safety symbols. Always read and obey all safety messages. This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others. Indicates an imminently hazardous situation which, if not avoided, will result in personal injury or death. DANGER Indicates a potentially hazardous situation which, if not avoided, could result in personal injury or death.
DO NOT adjust the internal gas valve. The design is such that adjustment is not required. Warranty will be voided if the internal gas valve is adjusted. WARNING WARNING FLAMMABLE • Only trained and qualified professionals are permitted to adjust parameter settings. • Proper venting is required for the safe operation of this appliance. • Flammable liquids such as cleaning solvents, aerosols, paint thinners, adhesives, gasoline and propane must be handled and stored with extreme care.
Topics in this section • Components • Specifications • Dimensions Figure 1: Components Anode Rod Locations (left and right side) Horizontal Models Vertical Models Note: same for both units 119-Gallon Storage Tank Hot Water Outlet Connection Securing Bracket 2-Unit Tankless Rack System Hot and Cold Water Manifolds Gas Line Recovery Pump and Isolation Valves Cold Water Inlet Connection DuoSmart™ Digital Controller Temperature and Pressure (T&P) Relief Valve Electrical Assembly DO NOT USE THIS OUTLE
Model Number Dimensions (Assembled) in. (mm) CHS398100CU w x h x d: 38.81 x 69.60 x 40.96 (985.8 x 1,767.8 x 1,040.4) Rack (with 2 Tankless Water Heaters): 220 lbs (100 kg); Tank: 310 lbs (141 kg) Complete System: 530 lbs (240 kg) Weight Installation Type Category and Ignition System Gas Consumption Btu/h (kW/h) Internal (Indoor) Commercial Applications Category IV, Direct Electronic Ignition Minimum: 30,400 (9) Water Supply Pressure Temperature Setting Tank Volume Maximum: 398,000 (116.
Model Number Dimensions (Assembled) in. (mm) Weight CHS398100HV CHS398100HVA*** CHS320100HV w x h x d: 32.4 x 78.8 x 40.2 (822.7 x 2,001.5 x 1,021.1) Tank: 310 lbs (141 kg) Complete System: 530 lbs (240 kg) Installation Type Category and Ignition System Gas Consumption Btu/h (kW/h) Internal (Indoor) Commercial Applications Category IV, Direct Electronic Ignition Minimum: 30,400 (9) Maximum: 398,000 (116.6) Water Supply Pressure Minimum: 30,400 (9) Maximum: 320,000 (93.
Recovery Capabilities for CHS398100 models U.S. Gallons / Hour Liters / Hour at Temperature Rise Indicated Tank Capacity 119 Gal. °F 30 40 50 60 70 80 90 100 110 120 130 140 °C 17 22 28 33 39 45 50 56 61 67 72 78 917 764 655 573 510 459 417 382 353 328 GPH 1,528 1,147 450 Liters LPH 5,784 4,342 3,471 2,892 2,479 2,169 1,931 1,738 1,579 1,446 1,336 1,242 Recovery Capabilities for CHS320100HV U.S.
Models CHS398100HiN CHS398100HiP Measurements below are shown in inches (millimeters). LEFT RIGHT *Temperature and Pressure Relief Valve 42.71 in. (1,085 mm) GAS 44.21 in. (1,123 mm) 58.55 in.* (1,487 mm) 5.91 in. (150 mm) Typical 38.81 in. (986 mm) * Temperature and Pressure Relief Valve 3.61 in. (92 mm) Drain H-Series Demand Duo™ 2 Installation and Operation Manual 4.14 in. (105 mm) Cold 11 68.94 in. (1,751 mm) Hot 66.35 in. (1,685 mm) Tank Height 65.77 in. (1,671 mm) PVC/PP Gas 67.31 in.
Models CHS398100HViN Measurements below are shown in inches (millimeters). CHS398100HViP CHS398100HVAiN CHS398100HVAiP CHS320100HViN CHS320100HViP FRONT 3.49 (88.64) Drain 78.96 (2,005) 67.31 (1,709) Electric 56.77 (1,442) T&P 51.12 (1,298) Gas 41.21 (1,046) 68.53 (1,740) Hot 66.35 (1,685) RIGHT 4.14 (105) 1-1/2 in. MNPT Cold 18.30 (464) T&P TOP 34.67 (880) Vent 40.04 (1,017) Ø 28.16 (715) H-Series Demand Duo™ 2 Installation and Operation Manual 28.
• The appliance and its main gas valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psi (3.5 kPa) (13.84 in W.C.). For system testing at pressures less than or equal to 1/2 psi (3.5 kPa) (13.84 in W.C.) the appliance must be isolated from the gas supply piping by closing its individual manual shutoff valve.
❶ Item # ❷ ❸ ❹ ❺ ❾ ❿ ❻ ⓬ ⓭ ❼ ❽ ❸ ⓫ Installation with Mixing Valve ⓯ ⓮ ⓰ Field Supplied ❶ Hot Water Outlet ✓ ❷ Hot Water Outlet Shut-Off Valve ✓ ❸ Cold and Hot Unions ✓ ❹ Temperature-Pressure Relief Valve ❺ Temperature-Pressure Relief Valve Discharge Pipe (do not cap, plug or reduce) ❻ Controller ❼ Pressure Relief Valve Discharge Pipes (do not cap, plug, or reduce) ❽ Condensate Discharge Pipe (must include an air gap) ❾ Gas Control Valve ✓ ❿ Gas Union ✓ ⓫ Cold Water Sup
❶ Item # ❷ ❸ ❾ ❿ ❻ ❹ ❺ ⓬ ❼ ⓭ ❽ ❸ ⓫ Installation with Mixing Valve ⓯ ⓮ ⓰ ⓱ ⓲ Field Supplied ❶ Hot Water Outlet ✓ ❷ Hot Water Outlet Shut-Off Valve ✓ ❸ Cold and Hot Unions ✓ ❹ Temperature-Pressure Relief Valve ❺ Temperature-Pressure Relief Valve Discharge Pipe (do not cap, plug or reduce) ❻ Controller ❼ Pressure Relief Valve Discharge Pipes (do not cap, plug, or reduce) ❽ Condensate Discharge Pipe (must include an air gap) ❾ Gas Control Valve ✓ ❿ Gas Union ✓ ⓫ Cold Wate
The Demand Duo™ 2 Commercial Hybrid Water Heating System is packaged and shipped in two separate shipping boxes for horizontal units. Carefully unpack the shipping boxes and verify the following contents are included. If any items are damaged or missing, contact your local dealer/distributor or call Rinnai Customer Care at 1-800-621-9419. Do not attempt to use any item that appears damaged.
Gather the recommended tools and materials before starting installation.
If you install the Demand Duo™ 2 in an area that is known to have hard water or that causes scale build-up, the water must be treated and may require a more frequent flushing schedule. This water heater includes a service indicator (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.
Topics in this section Step 1: Transport Step 2: Secure for Earthquake Step 3: Position Tank and Connect Water Step 4: Install Rack Frame Legs Step 5: Position Rack Step 6: Install Water Flex Lines Step 7: Secure Rack Step 8: Install Vent System Step 9: Install Relief Valve Lines Step 10: Fill System with Water Step 11: Connect Condensate Drain Line Step 12: Connect Gas Supply Step 13: Connect Communication Cable Step 14: Connect Power Supply 1.
When positioning the tank and connecting water, follow these guidelines: • Water connections to the Demand Duo™ 2 must follow all state and local plumbing codes. • When assembling the hot and cold water piping, use a high quality food grade pipe joint compound and ensure all fittings are tight. • DO NOT apply an open flame to the inlet and outlet fittings, as heat will damage or destroy the plastic lined fittings. This will result in premature failure of the fittings, which is not covered by the warranty.
To install the rack frame legs: 1. Lay the rack assembly down on the shipping pallet. 2. Position the frame legs (supplied) on each rack leg so that the threaded inserts are centered over the open slots. Frame leg NOTE The pallet may need to be elevated to complete assembly. Threaded inserts 3. Use the supplied 4 bolts (5/16 in. - 18) to fasten the frame legs to the rack legs.
To position the rack: 1. Loop hoisting straps (field-supplied) around the rack top frame. Straps should support approximately 220 lb (100 kg). Loop hoisting straps around rack top frame. 2. Position the rack in front of the tank, and then gently push the rack back as close to the tank as possible so that the flex lines can connect the two assemblies. Place rack in front of tank Push rack back close to tank 17.77 in.
To install flex lines: 1. Connect the 18 in. (457 mm) flex line from the cold water manifold to the threaded connection on top of the pump. Tighten to 25 ft-lb torque. Ensure the gasket is in the flex line. Cold water manifold 18 in. (457 mm) flex line Threaded connection on top of pump 2. Connect the 36 in. (914 mm) flex line from the hot water manifold to the threaded connection at the top of the tank. Tighten to 25 ft-lb torque. Threaded connection at top of tank 36 in.
To secure the rack: 1. The rack system must be anchored and secured in accordance with national and/or local codes having jurisdiction. Base holes to secure the rack are 0.5 in. (13 mm) in diameter. Reference local codes regarding minimum concrete thickness and use appropriate expansion anchors that are capable of supporting the rack system weight of approximately 220 lb (100 kg). Reference and follow the anchor manufacturer’s use and installation requirements. Bottom View 2.
To secure the rack: Refer to the Tankless Water Heater Installation and Operation Manual (supplied with each Tankless Water Heater in the Demand Duo™ 2 system) for complete venting information and instructions. Topics in this manual include: Venting Guidelines; Venting Installation Sequence and Instructions; Venting Options; Maximum Vent Lengths; and Termination Considerations. For vertical model installations, please refer to the recommended venting configuration shown in the image below. 3 in. PVC 2 in.
To secure the rack: A Pressure Relief Valve (PRV) is pre-installed on each tankless water heater in the Demand Duo™ 2 system. A combination Temperature and Pressure (T&P) Relief Valve is pre-installed on the tank. Install a drain pipe from each PRV and T&P Valve into a floor drain as shown in the diagram below. Refer to the guidelines on the next page.
• An approved PRV (pre-installed on each tankless water heater in the Demand Duo™ 2 system) is required by the American National Standard (ANSI Z21.10.3) for all water heating systems and shall be accessible for servicing. • The PRV must comply with the standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems ANSI Z21.22 and /or the standard Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum Relief Valves, CAN1-4.4.
When filling the system with water, follow these guidelines: • To prevent damage to the water heater, all air must be relieved from the system and a hot water fixture must be flowing water before the water heater is plugged in and turned on. NOTICE DO NOT OPERATE THE WATER HEATER UNLESS IT IS COMPLETELY FULL OF WATER. To fill the system with water: 1. 2. 3. 4. 5. 6. 7. Ensure the drain valve located at the bottom of the tank is closed (see A below). Open the nearest hot water fixture.
• All condensate must drain and be disposed of according to local codes. WARNING Condensate can form in the vent of high efficiency, direct vent tankless water heaters. Without proper drainage, condensate will damage the heat exchanger located inside the tankless water heater. When connecting the condensate drain line, follow these guidelines: • Use only corrosion-resistant materials for the condensate drain lines, such as PVC pipe or plastic hose.
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. To connect the gas supply: 1. Install a manual gas control valve in the gas supply line to the water heater.
To connect the communication cable: 1. Route the communication cable from the digital controller through the bottom side of the tankless water heater. 2. Plug the communication cable into the serial port located at the front top side of the tankless PC Board. PC Board serial port Communication Cable To connect the EZConnect™ cable: 1. On the primary water heater, connect the Accessory Cable to the Accessory Port at the bottom of the PC Board (Figure 3).
When connecting the power supply, follow these guidelines: • Do not rely on the gas or water piping to ground the water heater. Ground locations are provided inside the water heater. • Do not exceed the limits of the 15A circuit. • The water heater requires 120 VAC, 60 Hz power from a properly grounded circuit. • Do not connect power to the Demand Duo™ 2 system prior to completing installation and filling the system with water.
b. Remove the two screws securing the front panel to the gang box. Then, remove the front panel. 2. Plug the controller power cord into the electrical assembly on the storage tank. WARNING DO NOT plug the controller power cord into the electrical assembly until the storage tank is filled as the pump will overheat. c. Run building-supplied electrical wiring and conduit to the gang box. Wiring and Conduit Punch-Out d.
Complete the following checklist when installation is complete. You should be able to answer YES to each question. If you answer NO, installation is not complete. Refer to the applicable section in this manual and the tankless water heater installation and manual for additional information.
Storage Tank Anodes Storage Tank The storage tank is equipped with two magnesium anodes designed to extend the life of the storage tank. Slowly consumed over time, the anode protects the glass-lined tank from corrosion. Rinnai strongly recommends to inspect the anodes every two (2) years. If more than half of the anodes have been consumed, they should be replaced. Instructions on how to change the anodes can be obtained from the manufacturer.
Hot Water Supply Line LEGEND Union Ball Valve Check Valve Circulation Pump Expansion Tank Gas Supply Condensate Drain Line Pipe Temperature and Pressure Relief (T&P) Valve to Open Drain Cold Water Supply Building Circulation Pump Building Hot Water Return Line (Optional) When connecting multiple units, balancing valves, equivalent piping, pressure gauges, and temperature gauges are to be used as necessary to ensure proper flow between units.
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. The water heater is 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.
The digital controller maintains communication between the tank and tankless via the tankless communication cable to effectively control the tank temperature based on the selected temperature on the tankless unit. The digital controller will energize (120V) the pump when the tank temperature drops. When the tank temperature returns to the selected set temperature, the digital controller will de-energize the pump and remain in standby until the tank temperature drops again.
Replacement Parts for Horizontal Models ❽ ❷ ❶ ❺ ❻ ❼ ❾ ❹ ❸ ITEM NO. PART # DESCRIPTION 1 2 3 4 5 CU199IN/CU199IP 109000478 109000738 109000739 107000382 6 107000524 1 in. X 18 in. Water Flex Line 7 109000416 Gas Flex Line 8 109000830 Top Support Bracket 9 109000296 5/16 in.-18 Bolt Rinnai SENSEITM Tankless Water Heater TRW02 Frame Left Frame Base Right Frame Base 1 in. X 36 in.
⓰ ITEM NO. ❻ ❹ ❺ ❶ ❸ ❼ ❷ ⓫ ❼ ❻ ❽ ❾ ❿ PART # DESCRIPTION 1 107000432 119-Gallon Tank 2 107000377 Grundfos UPS26-150(S)F Pump 3 105000284 4-Unit Electrical Assembly 4 107000437 5 107000438 1 in. Street Elbow NPT 6 107000440 1 in. X 3 in. Dielectric Nipple 7 107000351 Isolation Flange 8 107000352 1-1/2 in. X 3 in. Brass Nipple 9 107000353 1 in. X 1-1/2 in. Reducing Elbow 10 107000308 1-1/2 in. X 4 in.
Replacement Parts for Vertical Models Item No.
Limited Warranty for Demand Duo H-Series 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 • Improper maintenance (such as but not limited to scale build-up, freeze damage, or vent blockage) • Misapplication of this product • Incorrect sizing • Improper installation (such as but not limited to) • − Product being installed in a corrosive environment Any other cause not due to defects in materials or workmanship • Problems or damage due to fi
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