INSTALLATION MANUAL Tankless Rack System Free-Standing Rack with Six Rinnai Tankless Water Heaters Lift, Position and Secure the Rack Installation section (page 30) Vent the Water Heaters Venting section (page 36) Connect Plumbing Plumbing section (page 38) Connect Gas Gas Supply section (page 42) Connect Power Power Supply section (page 43) Configure TRW02ST Configuring TRW02ST and & TRW03ST Models TRW03ST Rack Models for Recirculation section (page 46) Connect Water Heaters with Cascade Cable
1 Welcome Thank you for purchasing a Rinnai Tankless Rack System (TRS). This manual provides instructions on installing a TRS. For specific questions on the Rinnai Tankless Water Heaters, refer to the “Rinnai Tankless Water Heater Installation and Operation Manual” supplied with each water heater in the rack system. Read this manual completely before installing the TRS.
2 About Rinnai’s Tankless Rack System (TRS) is designed to supply a packaged water heating solution as a fully assembled system. The TRS includes preassembled water and gas connections and manifolds under the tankless water heaters that are properly sized to maintain optimum performance. TRS systems include wall-hanging, wall-mounted, corner-hanging and free-standing configurations.
Safety Precautions The following precautions apply to the installer and consumer. Read and follow all instructions in this section. WARNING 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. • Before operating, smell all around the appliance area • • • • • 4 for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.
4 Configurations TRS configurations and part numbers are listed in the following tables. Wall-Hanging Racks CU Series Part No.
Wall-Hanging Rack Configurations (Continued) HE+ Series Part No.
Free-Standing Racks Part No.
5 Specifications WALL-HANGING RACKS Available Configurations • 2-Units • 3-Units CU Series 2-Unit Wa l l - H a n g i n g F r a m e LEFT FRONT BACK BOTTOM Model Configuration Illustration TRW02CU 8 Rinnai Tankless Rack System (TRS) Installation Manual
CU Series 2-Unit Wall-Hanging Frame (Continued) Model Water Heater Model TRW02CUi CU199i (NG/LP) Crate Dimensions (HxLxD) - in 66 x 70 x 35 Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs Rack Frame - Specifications Frame Material Frame Finish Color TRWCU02CUe CU199e (NG/LP) 170 380 169 379 14 Gauge Hot Rolled Steel 1.5” Square Tube Powder Coat Gray 16 Gauge Stainless Steel 1.
WALL-HANGING RACKS → CU SERIES CU Series 3-Unit Wa l l - H a n g i n g F r a m e FRONT LEFT BACK BOTTOM Model Configuration Illustration TRW03CU TRW23CU2 2 10 This configuration is available only as a custom, made-to-order (MTO) solution with extended lead times.
CU Series 3-Unit Wall-Hanging Frame (Continued) Model TRW03CUi Water Heater Model Crate Dimensions (HxLxD) - in Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs TRW03CUe TRW23CUi TRW23CUe CU199i (NG/LP) CU199e (NG/LP) 66 x 70 x 35 248 244 469 465 CU199i (NG/LP) CU199e (NG/LP) 66 x 70 x 35 186 183 407 402 14 Gauge Hot Rolled Steel 1.5” Square Tube 16 Gauge Stainless Steel 1.5” Square Tube 14 Gauge 16 Gauge Hot Rolled Steel Stainless Steel 1.5” Square Tube 1.
WALL-HANGING RACKS → SE SERIES SE Series 2-Unit Wa l l - H a n g i n g F r a m e LEFT FRONT BACK BOTTOM Model Configuration Illustration TRW02SE2 2 12 This configuration is available only as a custom, made-to-order (MTO) solution with extended lead times.
SE Series 2-Unit Wall-Hanging Frame (Continued) Model Water Heater Model TRW02SEi RU199i (NG/LP) Crate Dimensions (HxLxD) - in 66 X 70 X 35 Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs Rack Frame - Specifications Frame Material Frame Finish Color TRW02SEe RU199e (NG/LP) 170 391 169 390 14 Gauge Hot Rolled Steel 1.5” Square Tube Powder Coat Gray 16 Gauge Stainless Steel 1.
WALL-HANGING RACKS → SE+ SERIES FEATURING THERMACIRC360™ SE+ Series Featuring ThermaCirc360™ LEFT 2-Unit Wa l l - H a n g i n g F r a m e FRONT BACK 4.
SE+ Series Featuring ThermaCirc360™ 2-Unit Wall-Hanging Frame (Continued) Model Water Heater Model Crate Dimensions (HxLxD) - in Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs TRW02STi TRW02STe RUR199i AND RU199i (NG/LP) RUR199e AND RU199e (NG/LP) 66 X 70 X 35 178 177 399 398 Rack Frame - Specifications Frame Material Frame Finish Color 14 Gauge Hot Rolled Steel 1.5” Square Tube Powder Coat Gray 16 Gauge Stainless Steel 1.
WALL-HANGING RACKS → SE+ SERIES FEATURING THERMACIRC360™ SE+ Series Featuring ThermaCirc360™ 3-Unit Wa l l - H a n g i n g F r a m e FRONT LEFT BACK BOTTOM Model Configuration Illustration TRW03ST 16 Rinnai Tankless Rack System (TRS) Installation Manual
SE+ Series Featuring ThermaCirc360™ 3-Unit Wall-Hanging Frame (Continued) Model Water Heater Model TRW03STi RUR199i AND RU199i (NG/LP) Crate Dimensions (HxLxD) - in Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs Rack Frame - Specifications Frame Material Frame Finish TRW03STe RUR199e AND RU199e (NG/LP) 66 x 70 x 35 258 476 254 472 14 Gauge Hot Rolled Steel 1.5” Square Tube 16 Gauge Stainless Steel 1.
WALL-HANGING RACKS → HE SERIES HE Series 2-Unit Wa l l - H a n g i n g F r a m e FRONT LEFT BACK 38.50 30.50 5.65 15.00 49.10 11.50 HOT (2”COPPER) 7.50 COLD (2”COPPER) 3.25 GAS (1-1/4”NPT) 30.50 BOTTOM Model Configuration Illustration TRW02HE2 2 18 This configuration is available only as a custom, made-to-order (MTO) solution with extended lead times.
HE Series 2-Unit Wall-Hanging Frame (Continued) Model Water Heater Model Crate Dimensions (HxLxD) - in Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs TRW02HEi TRW02HEXi TRW02HEe RL94i (NG/LP) RLX94i (NG) 66 x 67 x 35 120 334 RL94e (NG/LP) 120 334 120 334 Rack Frame - Specifications Frame Material 14 Gauge Hot Rolled Steel 1.5” Square Tube 16 Gauge Stainless Steel 1.
WALL-HANGING RACKS → HE SERIES HE Series 3-Unit Wa l l - H a n g i n g F r a m e LEFT FRONT BACK BOTTOM Model Configuration Illustration TRW03HE2 2 20 This configuration is available only as a custom, made-to-order (MTO) solution with extended lead times.
HE Series 3-Unit Wall-Hanging Frame (Continued) Model Water Heater Model Crate Dimensions (HxLxD) - in Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs TRW03HEi TRW03HEXi TRW03HEe RL94i (NG/LP) RLX94i (NG) 66 x 67 x 35 160 374 RL94e (NG/LP) 160 374 160 374 Rack Frame - Specifications Frame Material 14 Gauge Hot Rolled Steel 1.5” Square Tube 16 Gauge Stainless Steel 1.
WALL-MOUNT RACKS Available Configurations • 2-Units 2-Unit Wa l l - M o u n t F r a m e FRONT LEFT BACK BOTTOM The above configuration is a 3-unit wall-mount frame which is available as a custom, made-to-order (MTO) solution with extended lead times. Model Configuration Illustration TRS23ILWCU2 2 22 This configuration is available only as a custom, made-to-order (MTO) solution with extended lead times.
3-Unit Wall-Mount Frame (Continued) Model TRS23ILWCU Water Heater Model CU199i, CU199e (NG/LP) 66 x 70 x 35 222 Crate Dimensions (HxLxD) - in Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs Rack Frame - Specifications 424 Frame Rail Type Sheet Metal Frame Material Aluminum (0.
CORNER-HANGING RACKS Available Configurations • 2-Units 2-Unit Corner-Hanging Frame TOP FRONT Model Configuration Illustration TRC02CU2 2 24 This configuration is available only as a custom, made-to-order (MTO) solution with extended lead times.
2-Unit Corner-Hanging Frame (Continued) Model Water Heater Model Crate Dimensions (HxLxD) - in Weight - Fully Assembled - lbs Weight - Shipping (total) - lbs TRC02CUi CU199i (NG/LP) 31.5 x 48 x 50 224 356 Rack Frame - Specifications Frame Material Frame Finish Color 14 Gauge Hot Rolled Steel 1.
FREE-STANDING RACKS Available Configurations • 2-Units, 3-Units, 4-Units, 5-Units, 6-Units 4-Unit Free-Standing Frame FRONT LEFT 20.50 18.81 5.92 TYP 56.82 4.50 GAS (1-1/4”NPT) 9.38 COLD (2”COPPER) 34.53 14.38 HOT (2”COPPER) Model Configuration BOTTOM Illustration 26.29 28.59 Inline TRS02ILCU Facing Model Configuration Illustration Same Direction TRS04CU TRS02CU2 2 Back to Back This configuration is available only as a custom, made-toorder (MTO) solution with extended lead times.
4-Unit Free-Standing Frame (Continued) Model TRS04CU TRS03CU Water Heater Model TRS02CU TRS02ILCU CU199i, CU199e (NG/LP) Crate Dimensions (HxLxD) - in 66 x 70 x 35 Weight - Fully Assembled - lbs 365 290 214 214 Weight - Shipping (total) - lbs 562 490 416 416 Rack Frame - Specifications Frame Rail Type Sheet Metal Frame Material Aluminum (0.
6-Unit Free-Standing Frame LEFT FRONT BOTTOM Model Configuration Model Illustration TRS06CU TRS36CU2 TRS05CU TRS46CU2 TRS03ILCU TRS23ILCU2 Configuration Illustration 2 This configuration is available only as a custom, made-to-order (MTO) solution with extended lead times.
6-Unit Free-Standing Frame (Continued) Model TRS06CU TRS05CU TRS46CU TRS36CU TRS03ILCU TRS23ILCU Rack Frame - Specifications Frame Rail Type Sheet Metal Aluminum (0.
6 Installation Clearances When selecting an installation location, you must ensure the tankless water heaters mounted on the rack comply with the required clearances. For clearance requirements, refer to the “Rinnai Tankless Water Heater Installation and Operation Manual” supplied with each water heater in the rack system. Lift the Rack Hoisting Lifting Lugs Lugs are installed on the top side of the following racks for hoisting and moving. The lines or cables to the lugs should be at a 90° angle.
Hoisting Straps (Supplied by Installer) For TRW02 and TRW03 wall hanging racks, use hoisting straps (supplied by installer) looped around the top frame. Models Designed for Hoisting Straps TRW02CU TRW03CU Weights of the complete assemblies are available in the Specifications section of this manual. DO NOT hoist the crate or palette.
Secure the Rack Secure Free-Standing Racks All mechanical components shall be anchored and installed in accordance with national and/or local codes having jurisdiction. Base holes to secure all free-standing rack systems are 0.563 inches in diameter. Reference local codes regarding minimum concrete thickness and use appropriate expansion anchors that is capable of supporting the rack system weight. For outdoor installations, anchors must be capable of supporting the rack system weight and wind shear.
Secure Wall-Mount (In-Line) Racks WARNING THE WALL MUST BE CABABLE OF CARRYING THE OPERATING WEIGHT OF THE INSTALLED TRS SYSTEM. CONSULT A STRUCTURAL ENGINEER FOR STRUCTURAL ANALYSIS OF THE WALL AND APPROPRIATE HANGING METHODS BEFORE ATTEMPTING TO HANG THE TRS SYSTEM. FAILURE TO COMPLY WITH THE ABOVE REQUIREMENT COULD RESULT IN SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY OR DEATH. • Identify the installation location and confirm that the installation will meet all required clearances.
Secure Wall-Hanging Racks (TRW Models) WARNING THE WALL MUST BE CABABLE OF CARRYING THE OPERATING WEIGHT OF THE INSTALLED TRS SYSTEM. CONSULT A STRUCTURAL ENGINEER FOR STRUCTURAL ANALYSIS OF THE WALL AND APPROPRIATE HANGING METHODS BEFORE ATTEMPTING TO HANG THE TRS SYSTEM. FAILURE TO COMPLY WITH THE ABOVE REQUIREMENT COULD RESULT IN SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY OR DEATH. • Identify the installation location and confirm that the installation will meet all required clearances.
Secure Corner-Hanging Racks (TRC Models) THE WALL MUST BE CABABLE OF CARRYING THE OPERATING WEIGHT OF THE INSTALLED TRS SYSTEM. CONSULT A STRUCTURAL ENGINEER FOR STRUCTURAL ANALYSIS OF THE WALL AND APPROPRIATE HANGING METHODS BEFORE ATTEMPTING TO HANG THE TRS SYSTEM. FAILURE TO COMPLY WITH THE ABOVE REQUIREMENT COULD RESULT IN SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY OR DEATH. WARNING • Identify the installation location and confirm that the installation will meet all required clearances.
7 Venting For complete venting options and installation instructions, refer to the “Rinnai Tankless Water Heater Installation and Operation Manual.” Venting components are packaged separately from the pre-assembled rack for field assembly of the vent system by the contractor. The following vent options are available: • Direct Vent with Concentric Pipe IMPORTANT HE+ Series tankless water heaters must use concentric venting with a metal exhaust pipe.
Vent Options The following table lists the vent options for the CU Series, SE Series and SE+ Series tankless water heaters. HE+ Series tankless water heaters must use concentric venting with a metal exhaust pipe. Refer to the Installation and Operation Manual supplied with the HE+ Tankless Water Heater for venting options.
8 Plumbing Pressure Relief Valve Piping Each Rinnai Tankless Water Heater on the rack system comes installed with isolation valves and a pressure relief valve. Refer to the “Rinnai Tankless Water Heater Installation and Operation Manual” for information on piping the isolation valves and pressure relief valve.
Tankless Rack System Parallel Piping Diagram Rinnai Tankless Rack System (TRS) Installation Manual 39
Piping End Caps / Connections End caps are field-supplied and must be the following materials: • Cold water cap - Brass or Copper • Hot water cap - Brass or Copper • Gas cap - Black Iron When flow direction and gas supply side are determined, the other (opposite) side of the manifold must be capped. See the example below. Leak check the capped ends of the manifolds.
Condensate Drain Condensate drain must be sloped downward from the rack system. Condensate must be disposed of per local codes. Each Rinnai Tankless Water Heater has a condensate drain outlet on the bottom of the unit. A drain line must be connected to each water heater. Free-standing rack systems with 3 or more units will include a prefabricated condensate manifold. For all other rack systems, a condensate drain manifold must be field-fabricated (not shown in diagram).
9 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. Instructions To connect the gas supply, follow the instructions below: 1 2 3 42 Check the type of gas and gas supply pressure before connecting the water heaters.
10 Power Supply WARNING • • • Do not use an extension cord or adapter plug with this appliance. The water heaters 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.
Pre-Wired Electrical Assembly Electrical Assemblies are installed on the middle rack frame of the following indoor racks for single point electrical connection. Refer to the Specifications sections in this manual for electrical requirements. Interior Models Available with Electrical Assemblies Instructions WARNING Shut off building supply power prior to connecting to TRS electrical assembly. Failure to do so may result in property damage, bodily harm, or death.
IMPORTANT: The outlet is designed for use with Rinnai Tankless Water Heaters only. Do not insert power cords belonging to other appliances or electrical sources into the outlet. Outlet is designed for Rinnai Tankless Water Heaters only NOTICE DO NOT connect the tankless water heaters to the outlet located under the center rack prior to connecting building power supply to the rack electrical gang box. Doing so may cause damage to the PC Boards of the tankless water heaters.
Configuring TRW02ST and 11 TRW03ST Rack Models This Section is Applicable for TRW02ST and TRW03ST Rack Models Only TRW02ST and TRW03ST rack models are designed for the SE+ Featuring ThermaCirc360™ tankless water heaters, which include a built-in recirculation pump and two recirculation modes: DEDICATED MODE (Factory Default) Home/ business includes a dedicated circulation return line in the plumbing system.
Configure TRW02ST and TRW03ST Racks for Dedicated Mode (Dedicated Recirculation Return Line) IMPORTANT: This section is only for TRW02ST and TRW03ST rack models utilizing a dedicated recirculation return line in the plumbing system. All TRW02ST and TRW03ST racks are shipped configured for a dedicated recirculation return line. A single return line will connect to the RUR199 unit below the cold isolation valve as shown in the below schematic.
Configure TRW02ST and TRW03ST Racks for Dedicated Mode (Dedicated Recirculation Return Line) (Continued) Plumbing Diagram (Dedicated Mode) EZconnect cable 48 Rinnai Tankless Rack System (TRS) Installation Manual
Configure TRW02ST and TRW03ST Racks for Dedicated Mode (Dedicated Recirculation Return Line) (Continued) Plug/Filter Assembly (Dedicated Mode) ThermaCirc360 water heaters are factory set for dedicated recirculation. A threaded cap and bypass plug assembly are installed in the hot water outlet at the base of the water heater. For dedicated recirculation, it is NOT necessary to remove this plug.
Configure TRW02ST and TRW03ST Racks for Crossover Mode (Thermal Bypass Valve) IMPORTANT: This section is only for TRW02ST and TRW03ST rack models using a thermal bypass valve for recirculation in the plumbing system. 1 2 On the RUR199, remove the bypass plug and replace with the bypass filter. Configure the parameter settings for Crossover Mode on each water heater. Refer to the “Rinnai Tankless Water Heater Installation and Operation Manual” for detailed instructions.
Configure TRW02ST and TRW03ST Racks for Crossover Mode (Thermal Bypass Valve) (Continued) Plug/Filter Assembly (Crossover Mode) Follow the steps below to remove the bypass plug and replace it with the bypass filter (packaged with the Thermal Bypass Valve). 1 Remove threaded cap and Bypass Plug assembly from the hot water outlet at the base of each water heater. Bypass Plug Assembly 2 Remove Bypass Plug from the threaded cap. 3 Assemble bypass filter to the threaded cap.
Configure TRW02ST and TRW03ST Racks for Crossover Mode (Thermal Bypass Valve) (Continued) Parameter Settings (Crossover Mode) Refer to the Parameter Setting section of the “Rinnai Tankless Water Heater Installation and Operation Manual” for instructions on accessing and changing parameter settings.
12 Connect Water Heaters Primary Cascade Cable Required: • Cable length: 26 ft (8 m) OR • Cable Length: 10 ft (3 m) • One cable required for each Secondary 1 For proper operation, do not combine different models with cascade communication. Secondary 2-23 With use of cascade cable(s) (optional accessory purchased separately) up to 24 water heaters can be electronically connected.
Programming Cascade Communication Parameter Settings (Cascade Communication) Refer to the Parameter Setting section of the “Rinnai Tankless Water Heater Installation and Operation Manual” for instructions on accessing and changing parameter settings. SELECTION SETTING # SETTING DESCRIPTION A 08 Cascade Secondary (1-23) Primary 09 Units in Standby (Cascade) 1 2 c 3 4 E F 5 6 08 Cascade: Primary: Select the water heater intended to be the Primary water heater for cascade communication.
13 Installation Checklist Complete the following checklist when 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.
PRESSURE RELIEF VALVE (PRV) YES NO Is the discharge from the PRV piped to the ground or into a drain system as per local codes? 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.
14 Appendices TRW Replacement Parts ALL TRW MODELS Description Ref. 1 Dirt Leg 2 Gas Flex Line Assembly 3 Gas Valve 4 Hot Water Flex Line 5 Cold Water Flex Line 7 Cush Clamp 2.125 ID 9 Cush Clamp 1.
TRW HE Series Replacement Parts TRW02HE / TRW02HEX / TRW03HE / TRW03HEX Description REF. 1 Dirt Leg 2 Gas Flex Line Assembly 3 Gas Valve 4 Hot Water Flex Line 5 Cold Water Flex Line 6 Cush Clamp 1.625 ID 7 Cush Clamp 1.
TRC Replacement Parts 9 10 TRC02 Description REF. 1 Dirt Leg 2 Gas Flex Line Assembly 3 Gas Valve 4 18” Flex Line 5 21” Flex Line 6 Hot Water Manifold 7 Cold Water Manifold 8 Gas Manifold 9 10 Cush Clamp 1.66 ID Cush Clamp 1.
TRS Replacement Parts ALL TRS/TRSILW Description REF. 1 Dirt Leg 6 26/27 2 Gas Flex Line Assembly 3 Gas Valve 4 Hot Water Flex Line 5 Cold Water Flex Line 6 Wall Bracket 7 Cush Clamp 2.63 ID 8 Cush Clamp 2.125 ID 9 Cush Clamp 1.90 ID 10 Cush Clamp 1.66 ID 11 Cush Clamp 1.
TRS Replacement Parts (Continued) CONDENSATE MANIFOLD RACK DESCRIPTION TRS03IL/ILW 3 Connections - In-Line Rinnai Tankless Rack System (TRS) Installation Manual TRS03CU 3 Connections - 3B2B TRS04CU 4 Connections - 4B2B TRS05CU 5 Connections - 5B2B TRS06CU 6 Connections - 6B2B TRS36CU 3 Connections - 3B2B TRS46CU 4 Connections - 4B2B 61
15 Limited 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.
• Improper installation (such as but not limited to) • Product being installed in a corrosive environment − 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 (such as but not limited to scale build-up, freeze damage, or vent blockage) • Incorrect sizing • Any other cause not due to defects in materials or workmanship • Proble
100000558(3) Rinnai Tankless Rack System (TRS) Installation 4/2020 Manual
