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Direct Vent Tankless Water Heater
Operation and Installation Manual
RL75i .................. REU-VB2528FFUD-US
RL94i .................. REU-VB2735FFUD-US
R98LSi ................ REU-VA3237FFU-US
R98LSi-ASME .... REU-VA3237FFU-ASME
FOR INDOOR APPLICATIONS ONLY
Table of Contents ..................... 2
Consumer Safety Information ... 4
The VB series (RL75i, and RL94i) are certified for
installation in manufactured (mobile) homes. Operating Instructions ............... 6
Maintenance ....
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This model has been built in accordance with R R98LSi-ASME the requirements of the ASME Boiler and Pressure Vessel Code and has received the Certificate of Authorization from the National Board. The heat exchanger on this unit has the NB and HLW stamps. California Proposition 65 lists chemical substances known to the state to cause cancer, birth defects, death, serious illness or other reproductive harm. This product may contain such substances, be their origin from fuel combustion
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Specifications Model RL75i R98LSi RL94i R98LSi-ASME 9,900 (NG) Minimum Gas Consumption Btu/h 19,000 10,300 (LPG) 199,000 (NG) Maximum Gas Consumption Btu/h 180,000 237,000 190,000 (LP) 0.4 - 7.5 GPM 0.4 - 9.4 GPM 0.6 - 9.8 GPM Hot water capacity (Min - Max) * (1.5 - 28.5 L/min) (1.5 - 35.5 L/min) (2.4 - 37 L/min) 6.6 GPM 7.1 GPM 8.5 GPM Hot water capacity (45°F rise) (25.0 L/min) (27.0 L/min) (32.2 L/min) Default Temperature Setting (no controller) 120º F (49º C) Tempe
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Consumer Safety Information Safety Definitions 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 death or DANGER serious injury. Indicates a potentially hazardous situation which, if not avoided, could result in death or WARNING serious injury. Indicates a potentially hazardous situation which, if not avoi
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Temperature Controller MC-91-1US & MCC-91-1US Dimensions (inches): 3.5 W x 4.75 H x 0.75 D The MC-91 controller is the standard temperature controller that is supplied with the water heater. On indoor models it is integrated into the front panel. The MCC-91 controller is for commercial and hydronic applications requiring higher temperatures. When the MCC-91 controller is connected, these higher temperatures are available on all controller models in the system. Refe
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MC-502 BC-100 MC-100 MCC-91 MC-91 Operating Instructions The MC-91 temperature controller is supplied with the RL75, RL94, and R98LS models. Additional functions are available through the use of optional controllers. There are several models of temperature controllers that can be purchased separately. Their description, operation, and installation is provided in this manual in case additional temperature controllers are purchased and installed. Features Available on Temperature
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How to Set the Temperature Hot water can be dangerous, especially for infants or children, the elderly, DANGER or infirm. There is hot water scald potential if the thermostat is set too high. Water temperatures over 125º F (52º C) can cause severe burns or scalding resulting in death. Hot water can cause first degree burns with exposure for as little as: 3 seconds at 140º F (60º C) 20 seconds at 130º F (54º C) 8 minutes at 120º F (49º C) Test the temperatur
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Temperature Controller Settings * Re-setting the Maximum Temperature (RL75 and RL94 only) Maximum Temperature Models RL75 and RL94 have a default maximum temperature of 120º F 120º F (49º C) 140 ºF (60 ºC) (49º C) and an option to increase the maximum temperature to 140 ºF Switch No. Switch No. (60 ºC). Temperature settings from 125-140 ºF (52-60 ºC) are available ON ON by setting switch 6 to ON in the SW1 bank of 8 switches. O O 1 1 F F 2 2 F F ** MCC-91 Temperat
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Using the Water Smart / Bath Fill Function The bath fill function will not work Overview NOTICE properly if it is connected to multiple water heaters. The tub will overfill This function is exclusive to the BC-100V temperature Multiple because the bath fill function is not controller. The bath fill function allows the consumer able to measure the water volume to fill a tub with a preset volume of water at a preset Water when connected to multiple water temperature.
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Using the Water Smart / Bath Fill Function Filling the Tub 1. Press the “Water Smart / Bath Fill” To stop the water flow during the Bath NOTICE button once. The button will Fill function, press the “Water Smart / illuminate, and a tone will sound. Bath Fill” button. The button will flash To Stop the and the voice prompt will announce, 2. The voice prompt will announce “Hot water is not available. Turn off Bath Fill “The hot water system is ready. all hot water t
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Maintenance Snow Accumulation WARNING Keep the area around flue terminal free of snow and Turn off the electrical power supply, the manual gas ice. The appliance will not function properly if the valve and the manual water control valve whenever intake air or exhaust is impeded (blocked or partially servicing the unit. blocked) by obstructions. Repairs and maintenance should be performed by a Visual Inspection of Flame qualified service technician. The
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Error Codes The Rinnai water heater has the ability to check its own operation continuously. If a fault occurs, an error code will flash on the display of the temperature controller. This assists with diagnosing the fault and may enable you to overcome a problem without a service call. Please identify the code displayed when inquiring about service. Some of the checks below may need to be done by a qualified service technician. Call a WARNING service technician for any remedy th
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Error Codes Code Fault Remedy 14 Thermal Fuse Check gas type of unit and ensure it matches gas type being used. Check for restrictions in air flow around unit and vent terminal. Check for low water flow in a circulating system causing short-cycling. Ensure dip switches are set to the proper position. Check for foreign materials in combustion chamber and/or exhaust piping. Check heat exchanger for cracks and/or separations. Check heat exchanger surface for hot spots which indicate block
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Trouble Shooting for Common Issues I don’t have any hot water when I open the tap. White smoke comes out of the exhaust. Make sure there is gas, water, and electricity to the During colder weather when the exhaust temperature Rinnai water heater (power is turned on and the gas is is much hotter than the outside air, the exhaust fumes turned on). condense producing water vapor. When I was using the hot water, the water got cold. When I open a hot tap, I do not immediately get
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In-line Filter Gas Hot Cold Supply Water Water Line Line Flushing the Heat Exchanger (Error Code: LC or 00) An “LC” or “00” error code indicates the unit is beginning to lime up and must be flushed. Failure to flush the appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s warranty. After flushing, reset the LC fault code by turning off the power to the unit and turning the power back on. KEY 1. Disconnect electrical po
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Installation Instructions Only properly trained and qualified installers RL75i .................. REU-VB2528FFUD-US should install this appliance. The warranty may be voided due to improper installation or RL94i .................. REU-VB2735FFUD-US installation by a non-qualified installer. R98LSi ................ REU-V A3237FFU-US Rinnai highly recommends all installers attend a product knowledge class. R98LSi-ASME .... REU-VA3237FFU-ASME For information on a Rinnai Training Cou
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Clearances from Appliance to top to Non- to Combustibles Combustibles RL75i RL75i R98LSi R98LSi RL94i RL94i Top of 6 inches ** 12 inches 2 inches ** 2 inches Heater (152 mm) (305 mm) (51 mm) (51 mm) to side Back of 0 (zero) 0 (zero) 0 (zero) 0 (zero) Heater Front of 6 inches 6 inches 6 inches 6 inches Heater (152 mm) (152 mm) (152 mm) (152 mm) Sides of 2 inches 2 inches 1/2 inch 1/2 inch Heater (51 mm) (51 mm) (13 mm) (13 mm) to front Ground/ 12 inches 1
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Electrical Connection The water heater requires 120 VAC, 60 Hz power from a properly grounded circuit. If using the 6 foot long power cord, plug it into a standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet. The wiring diagram is located on the Technical Sheet attached to the inside of the front cover. The water heater must be electrically grounded in accordance with local codes, or in the absence of local codes with the National Electrical Code, ANSI/NFPA 7
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Gas Piping Pipe Sizing Procedure - Example The gas supply must be capable of handling the entire gas load 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 in the United States, refer to the National Fuel Gas Code, NFPA 54. For Canadian gas pipe sizing, refer to the Natural Gas and Propane Installation Code CAN/CSA B149.1. The below information is provided as a
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Water Piping Isolation Valves and Pressure Relief Valve (RL75i and RL94i) The isolation valves provide the ability to isolate the water heater from the structure’s plumbing and allow quick access to flush the heat exchanger. Check with local codes to determine if a pressure and temperature relief valve is required. The included valves meet American National Standard (ANSI Z21.10.3) / C Canadian Standard (CSA 4.3) and are ANSI/NSF 61 A D approved for potable
