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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.  

Follow the gas supplier

,

s instructions. 

If you cannot reach your gas supplier, call the fire 
department. 

 

Installation and service must be performed by a qualified 
installer, service agency or the gas supplier. 

WARNING: If the information in these instructions is not 
followed exactly, a fire or explosion may result causing 
property damage, personal injury or death. 

Operation and Installation Manual

 

INSTALLER:  Leave this manual with the appliance. 
CONSUMER:  Retain this manual for future reference. 

R50LSi

............... REU-VA2019FFUD 

R75LSi

............... REU-VA2528FFUD(A) 

R94LSi

............... REU-VA2535FFUD 

R98LSi

............... REU-VA3237FFU 

R98LSi-ASME

.... REU-VA3237FFU-ASME 

Direct Vent Tankless Water Heater

 

ANS Z21.10.3 

CSA 4.3 

FOR INDOOR APPLICATIONS ONLY

 

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Table of Contents...................... 2 

Consumer Safety Information ... 4 

Operating Instructions ............... 5 

Maintenance.............................. 12 

Error Codes............................... 13 

Installation Instructions.............. 17 

Consumer Support .................... 42 

Summary of Contents for R50LSI

Page 1: ...service agency or the gas supplier WARNING If the information in these instructions is not followed exactly a fire or explosion may result causing property damage personal injury or death Operation a...

Page 2: ...Instructions 19 Pipe Sizing Procedure Example 20 Water Piping General Instructions 21 Pressure Relief Valve 21 Freeze Protection 21 Freeze Protection Piping 22 Recommended Piping for Basic Installati...

Page 3: ...40 F 60 C Minimum Temperature Setting 98 F 37 C Weight 50 lb 23 kg 55 lb 25 kg Efficiency Rating Noise level 49 dB Electrical Consumption Normal 53 W 99 W Standby 2 W Anti frost Protection 116 W By Pa...

Page 4: ...is 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 serious injury Indicates a poten...

Page 5: ...S remote controller is supplied with the appliance Additional functions are available through the use of optional controllers Operating Instructions Features MC 91 MC 100 BC 100 MC 502 Description Cal...

Page 6: ...eater Refer to the MC 502RC 1US S manual and the Wireless Controller Installation Instructions for complete details on features operation and installation The MC 91 controller allows a maximum tempera...

Page 7: ...Button In Use Indicator Clock Call Priority Button and Indicator Water Smart Bath Fill Indicator Water Smart Bath Fill Button Power Save Water Volume Sound Volume MC 100V 1US BC 100V 1US The BC 100V c...

Page 8: ...setting for this appliance installed without a remote controller is 120 F 49 C If desired the temperature setting can be changed to 140 F 60 C by adjustment of a dip switch Set dip switch 5 to ON to o...

Page 9: ...ratures for a given model are provided below Model Temperature Settings Available F R50LSi 98 100 102 104 106 108 110 115 120 125 130 135 140 150 160 R75LSi 98 100 102 104 106 108 110 115 120 125 130...

Page 10: ...The water heater will cease the hot water flow when the preset volume has been reached The hot water tap should then be closed and the bath fill button pressed The temperature settings for the bath fi...

Page 11: ...s the Water Smart Bath Fill button The button will flash and the voice prompt will announce Hot water is not available Turn off all hot water taps and push the Bath Fill button Follow the voice prompt...

Page 12: ...pe cabinet Vent System The vent system should be inspected at least annually for blockages or damage Motors Motors are permanently lubricated and do not need periodic lubrication Keep fan and motor fr...

Page 13: ...e igniter is operational Check igniter wiring harness for damage Check gas solenoid valves for open or short circuits Remove burner cover and ensure all burners are properly seated Remove burner plate...

Page 14: ...l Abnormal Check modulating gas solenoid valve wiring harness for loose or damage terminals Measure resistance of valve coil 61 Combustion Fan Failure Ensure fan will turn freely Check wiring harness...

Page 15: ...water heater continues to run The fan is designed to continue running for a short time after the flow of water stops This is to ensure constant water temperatures during rapid starting and stopping as...

Page 16: ...water and cold water lines V3 and V4 3 Connect pump outlet hose H1 to the cold water line at service valve V2 4 Connect drain hose H3 to service valve V1 5 Pour approximately 4 gallons of virgin food...

Page 17: ...res in excess of 1 2 psi 3 5 kPa 13 84 in W C The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas sup...

Page 18: ...aning and replacement The clearance for servicing is 24 inches in front of the water heater For closet installation R50LSi R75LSi R94LSi clearance is 6 inches 152 mm from the front R98LSi clearance is...

Page 19: ...solution soap and water or an equivalent nonflammable solution as applicable Since some leak test solutions including soap and water may cause corrosion or stress cracking the piping shall be rinsed...

Page 20: ...Table Propane Gas Pipe Size inches 10 20 30 40 50 60 70 80 90 100 125 150 175 200 3 4 1 1 1 4 1 1 2 273 1060 1580 188 1090 151 873 129 747 114 662 104 600 95 368 552 89 343 514 83 322 482 79 304 455 7...

Page 21: ...a nonpotable water heating appliance Ensure that the water filter on the Rinnai water heater is clean and installed An approved pressure relief valve is required by the American National Standard ANSI...

Page 22: ...de home attic crawl space or building structure ALL water pipe and fittings shown above the dashed line in the drawing Rinnai Water Heater 3 4 Gas Connection S The vacuum breaker line should be locate...

Page 23: ...cement for professionally engineered project drawings This drawing is not intended to describe a complete system it is up to the contractor engineer to determine the necessary components for and confi...

Page 24: ...3 4 Cold Water Supply Line Electric Water Heater Building Fixtures Building Supply Expansion Tank Gas Supply QTY 1 1 Rinnai Water Heater Notes PLEASE NOTE FOR RESIDENTIAL AND COMMERCIAL APPLICATIONS T...

Page 25: ...h effect caused by frequent On Off operation Note Water heater outlet temperature cannot be adjusted when circulation pump is running QTY 1 1 Expansion Tank Rinnai Water Heater Rinnai Equipment List R...

Page 26: ...h one self tapping screw Refer to the vent pipe manufacturers instructions for component assembly instructions Condensate Condensate formation can occur in high efficiency direct vent appliances To pr...

Page 27: ...vent length dip switch no 1 is required to be in the OFF position This ensures the water heater will run properly Blocked flue error codes and shutdowns may result if dip switch no 1 is not in the co...

Page 28: ...E mail support protechinfo com Web Site www protechinfo com Z Flex Telephone 1 800 654 5600 Fax 1 888 889 3539 E mail sales z flex com Web Site www novaflex com Listed and Tested Vent Products for Ma...

Page 29: ...cony 12 inches 30 cm 12 inches 30 cm B Clearance to window or door that may be opened 36 inches 91 cm 12 inches 30 cm C Clearance to permanently closed window D Vertical clearance to ventilated soffit...

Page 30: ...uirements on the previous page 60 V V 1 52 m between Rinnai terminals at different levels 12 12 36 INSIDE CORNER V V 0 91 m to ventilated or unventilated soffit or eve vent or to a deck or porch 0 30...

Page 31: ...nt top 5 Install the 4 screws at the vent top and tighten the 4 screws at the bracket Secure the first vent component to the water heater with one self tapping screw at the hole located above the cond...

Page 32: ...ch the pipe to the air intake terminal 5 Apply a bead of silicone around the pipe and air intake terminal ensuring an air tight connection Exhaust Pipe Assembly Refer to the manufacturer s installatio...

Page 33: ...erminations The air intake requires a return bend or two 90 elbows to prevent entry of rain SLOPE INTAKE AND EXHAUST TOWARD OUTSIDE TERMINATION MINIMUM 1 4 PER FOOT Horizontal with Concentric Terminat...

Page 34: ...nnects 2 to 5 water heaters and allows them to function as one hot water source Refer to the instructions that come with the accessory for complete installation information Number of Connected Water H...

Page 35: ...tself and still operate the water heater All functions will be available with the exception that the clock function on the BC 100V will only be available if an MC 100V is also connected If 4 MC 91 s a...

Page 36: ...l connections 10 Thread the cable through the access hole at the base of the unit and connect the wires to the controller terminals on the right hand side bottom of the PCB 11 Secure the controller ca...

Page 37: ...TO APPLIANCE 1 Turn off all electric power to the appliance using the ON OFF button 2 Set the thermostat to lowest setting 3 Locate the manual gas valve on the side of the heater Turn the manual valve...

Page 38: ...60 70 80 90 10 45 40 35 30 25 20 15 10 5 0 0 Pressure Loss ft head 0 25 50 75 100 125 150 delta T Temperature Rise F Water Flow Rate gpm Technical Data Pressure Drop Curve Outlet Flow Data R98LSi R94...

Page 39: ...losses The pressure drop curve based on the water heater model is provided in this manual Replacement When replacing an existing space heating application s water heating source boiler tank water hea...

Page 40: ...from center 4 3 110 2 4 61 G Cold Water Inlet from wall 2 8 70 3 7 94 H Cold Water Inlet from center 1 1 27 2 0 52 I Gas Connection from wall 4 3 109 2 2 56 2 J Gas Connection from center 3 5 89 4 3 1...

Page 41: ...V A B C SG SWITCHING POWERSUPPLY THERMISTOR CIRCUIT B SG RELAY 1 A WATERFLOW SENSOR CIRCUIT WATERFLOW CONTROLDEVICE CIRCUIT A SG A SG SG A QS SG FR FLAME DETECTING CIRCUIT FLAMEROD GND SG A REMOTE CON...

Page 42: ...d or reinstalled at a new location How long does coverage last Limited Warranty Warranty Information The installer is responsible for your water heater s correct installation Please complete the infor...

Page 43: ...is Warranty What is not covered This Warranty does not cover any failures or operating difficulties due to the following accident abuse or misuse alteration misapplication force majeure improper insta...

Page 44: ...grammable Thermostat Energy Efficient Vent free No Visible Flame Oxygen Depletion Sensor Secondary Heat Source Cool to the Touch Cabinet Direct Vent Fireplace RHFE 750ETR Energy Efficient Source of Zo...

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