HTP Hydra Smart RT-199 Service Manual
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HTP Hydra Smart RT-199 Service Manual

Residential water heater
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Service Manual
HYDRA SMART RESIDENTIAL WATER HEATER
Advanced Heating
& Hot Water Systems
120 Braley Road, East Freetown, MA 02717
•
1-800-323-9651
•
www.htproducts.com
LP-532 REV. 8.13.2014
Hydra Smart Residential Water Heater
Service Manual
Model
RT-199
• Natural Gas ( NG ) – Factory Default
• Liquid Propane Gas ( LP ) – Contact Factory
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. 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.
LP-532 REV. 8.13.2014
(Residential Water Heater)
SCAQMD Rule 1146.2
SCAQMD Rule 1146.2

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Summary of Contents for HTP Hydra Smart RT-199

  • Page 1 Hydra Smart Residential Water Heater Service Manual Model RT-199 (Residential Water Heater) Service Manual • Natural Gas ( NG ) – Factory Default • Liquid Propane Gas ( LP ) – Contact Factory HYDRA SMART RESIDENTIAL WATER HEATER SCAQMD Rule 1146.2 SCAQMD Rule 1146.2 WARNING If the information in these instructions is not followed exactly, a fire or explosion may result,...

  • Page 2: Table Of Contents

    Domestic hot water high temperature control Chapter 1 Product Characteristics Specifications Water flow rate Dimensions Fan speed Components description Lock mode Flow chart Operating temperature (Heat Exchanger) Time chart DHW Outlet Water Temperature Operation flow chart Exhaust Gas Temperature. Wiring diagram DHW Inlet Water Temperature. Chapter 2 Components description Main control board...
  • Page 3 Chapter 4 Troubleshooting Error code. Gas valve Er 10 Condensate trap Er 11 Flow control sensor Er 16 Cold water inlet filter assembly Er 20 Cold water inlet filter Er 29 Mixing valve Er 31 Air gas mixer(AGM) Er 32 BLDC Fan assembly Er 33 Er 35...

  • Page 4: Dimensions

    Chapter 1 Product Characteristics Model Name RT-199 199,000 Btu/h Gas Input Rate 19,900 Btu/h 35°F Rise 11.0 Gal Hot Water Capacity 45°F Rise 8.5 Gal 77°F Rise 5.0 Gal Installation Indoor, Wall Hung, Fully Condensing Flue System Sealed Combustion Direct Vent Vent Run 2” (15 ft), 3″(100ft) Schedule 40 PVC, CPVC, PP NG(Orifice/Needle) 9.5 mm (0.374˝) / 9.5 mm (0.374˝) Orifice Size LP(Orifice/Needle) Consult the factory 3.5˝ WC to 14˝ WC...
  • Page 5 Chapter 1 Product Characteristics Chapter 1 Product Characteristics Name of Component Name of Component Exhaust Vent Adapter Exhaust Duct Air Intake Adapter Gas Valve AGM(Air Gas Mixer) Gas Inlet Pipe 2 Ignition Transformer BLDC Fan Description Diameter Igniter Air Intake Pipe Adapter Exhaust Outlet Pipe collar 3˝...

  • Page 6: Flow Chart

    Chapter 1 Product Characteristics Chapter 1 Product Characteristics Flow chart Time chart If normal ignition ■ IGNITION GAS VALVE FLAME DETECTION 1.5s 2s If Flame Extinguishes ■ IGNITION GAS VALVE FLAME DETECTION 180s ■ If abnormal ignition (Alarm after the 10 trial) IGNITION GAS VALVE FLAME DETECTION 1.5s 2s 10s 1.5s 2s LP-532 REV. 8.13.2014 LP-532 REV.

  • Page 7: Operation Flow Chart

    MCU testing cycle >= 30min Ignition Detecting Gas Chapter 1 Product Characteristics Chapter 1 Product Characteristics E R R OR 40 leakage MCU Testing Flame Extinction >= Operation Flow Chart Operation Flow Chart Igniter "ON" S tart Flame E xtinction >= 8 times Igniter "ON"...

  • Page 8: Wiring Diagram

    Chapter 1 Product Characteristics Chapter 1 Product Characteristics Wiring diagram CN11 CN14 CN10 CN12 Jumper Wire LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014...
  • Page 9 Chapter 1 Product Characteristics Chapter 1 Product Characteristics Connector Connector Description no. of location and Board SELV Descriptions no. of location and SELV type Silk Pin nr. Board Silk type Flame Detect Sensor SELV (5VDC) Unused Power Supply Line HT (120VAC) OP.S Operation water temperature sensor SELV (5VDC) Unused HT (120VAC)

  • Page 10: Components Description

    Chapter 2 Components description Chapter 2 Components description HX Temperature Sensor / 7850P-081 Exhaust Temp. Sensor / 7850P070 Check Point Description/Part # Water Outlet Sensor / 7850P-019 (Main PCB) Check Point Description/Part # Main Control Board / 7850P-058 Water Inlet Sensor / 7850P-015 (Main PCB) The controller compares each sensor with setting temperature then goes to safety Function shutdown when measured temperature is over setting temperature.

  • Page 11: Burner Overheat Switch

    Chapter 2 Components description Chapter 2 Components description Burner Overheat Switch / Check Point Freeze protection heater / 7850P- Check Point Description/Part # CN9 ,CN11 Description/Part # 7850P-009 (Main PCB) (Main PCB) Bunner Overbheat Switch prevents damages to the burner plate caused by This components prevents the water piping from freezing when water temperature in the Function Function...

  • Page 12: Gas Leak Detector Sensor

    Chapter 2 Components description Chapter 2 Components description Gas Leak Detection Sensor / Check Point Check Point Description/Part # Description/Part # Jumper Wire Connection / 7850P-096 CN 11 7850P-093 (Main PCB) (Main PCB) Function Function This senosr shutsdown the unit if gas leak is detected This part is used to jump out circuit Failure Event Failure Event...

  • Page 13: Air Pressure Switch

    Chapter 2 Components description Chapter 2 Components description Check Point APS: Air Pressure Switch / Check Point Description/Part # CN 11 Description/Part # Mixing Valve / 7850P054 CN 10 7850P-047 (Main PCB) (Main PCB) Function This component monitors the flue for blockage. Function This component controls DHW outlet temperature by mixing cold and hot water. ① Combustion noise is generated. ① Water flow is not detected and/or water leakage occurs around the mixing valve. Failure Event Failure Event ② Imperfect and lifting flame occurs.

  • Page 14: Inlet Water Filter

    Chapter 2 Components description Chapter 2 Components description Check Point Check Point Description/Part # Flow Control Valve / 7850P-053 Description/Part # Inlet Water Filter / 7850P-017 CN 14, CN 3 (Main PCB) (Main PCB) The component detects water flow and regulates water flow rate in order to supply This component consists of durable STS, PPS material for filtering out debris and heavy Function Function stable hot water (More than 0.5 GPM). metals. Failure Event Failure Event Water flow rate is not detected and water leakage occurs around the flow control valve.

  • Page 15: Ignition Transformer

    Chapter 2 Components description Chapter 2 Components description Check Point Flame Detection Sensor / Check Point Description/Part # Description/Part # Ignition Transformer / 7850P-045 CN 9 CN 7 (Main PCB) 7850P-031 (Main PCB) Function Function Detects flame during combustion Generates sparks energy to ignite the fuel. Failure Event Failure Event Ignition fault.
  • Page 16 Chapter 2 Components description Chapter 2 Components description Check Point Check Point Description/Part # Gas Valve / 7850P-012 Description/Part # Air Gas Mixer / 7850P-004 CN12 (Main PCB) (Main PCB) Negative gas valve controls the regulation of gas and air mixture in the combustion Function Function The component provides proper air and gas mixture to the burner.

  • Page 17: Metal Fiber Premix Burner

    Chapter 2 Components description Chapter 2 Components description Check Point M e t a l F i b e r P r e m i x B u r n e r / Check Point Description/Part # Description/Part # BLDC Fan / 7850P-002 (Main PCB)

  • Page 18: Heat Exchanger

    Chapter 2 Components description Chapter 2 Components description Heat Exchanger(STS) / Check Point Check Point Description/Part # Description/Part # Condensate Trap / 7850P-014 7850P-032 (Main PCB) (Main PCB) The component reliably discharges the condensate generated by the The component heats the water by absorbing high-temperature heat generated by the Function Function burner. combustion. ① Water or exhaust gas leakage through the crack. Failure Event Failure Event Unneutralized condensate is discharged. ② Abnormal heat exchange.

  • Page 19: How To Use Control Panel

    Chapter 3 How to use control panel Chapter 3 How to use control panel Function explanation Control panel Customized Temperature Control Advanced technology used for the flow sensor and heat capacity control makes domestic hot water highly efficient by maintaining constant temperature during usage. [Initial power-up condition] When power is supplied, zero point of the mixing valve is checked for 6 seconds. After that, normal 800 steps function is in progress. At this time, if zero point is not confirmed, Er 66 occurs. After error is automatically restored when zero point was confirmed, normal 800step function is in progress.

  • Page 20: Domestic Hot Water Temperature Control

    Chapter 3 How to use control panel Chapter 3 How to use control panel Domestic Hot water temperature control (Range: 95 ~ 122℉) P-920C HIGH HIGH HIGH HIGH Press ‘hot water temperature control Parameter Detail Description Turn the dial to set desired DHW button’ to enter A: Li or A: GA Flow 1 Current Flow Value (Li: Liters/min, GA: Gallons/min) temperature.

  • Page 21: Water Flow Rate

    Chapter 3 How to use control panel Chapter 3 How to use control panel View System Parameters Program Lock mode Water flow rate (GPM or LPM) HIGH HIGH HIGH HIGH HIGH HIGH Turn the dial until current status ‘off’ mode turns into ‘on’. Press ‘current status’ for 5 After ‘A:GA’ has been displayed by Press the dial button for 1 sec when Press power button to turn on the secs and ‘A:GA’ will show up. Water flow status will be displayed. pressing ‘current status button’ for 5 ‘d:Lc‘ shows up. unit. (ex : 2.64) secs, turn the dial until it shows ‘d:Lc‘. Default setting in common.

  • Page 22: Dhw Outlet Water Temperature

    Chapter 3 How to use control panel Chapter 3 How to use control panel DHW Outlet Water Temperature DHW Inlet Water Temperature. HIGH HIGH HIGH HIGH HIGH HIGH Current DHW outlet water temperature After ‘A:GA’ has been displayed status will be displayed. (ex : 120℉) Current Inlet water temperature sta- After ‘A:GA’ has been displayed by Press ‘dial button’ for 1 sec when by pressing ‘current status button’ Press ‘dial button’ for 1 sec when tus will be displayed. (ex : 75℉) pressing ‘current status button’ for 5...

  • Page 23: View Burner Operating Time (Unit: 1 Hour)

    Chapter 3 How to use control panel Chapter 3 How to use control panel View Burner Operating Time (Unit: 1hr) View Ignition Cycles (displayed value X 10 times) HIGH HIGH HIGH HIGH HIGH HIGH After ‘A:GA’ has been displayed After ‘A:GA’ has been displayed by pressing ‘current status button’ by pressing ‘current status button’ Turn the dial until ‘2:rh’ shows up. Press ‘dial button’ for 1 sec when Press ‘dial button’ for 1 sec when Turn the dial until ‘4:lt’ shows up. for 5 secs, turn the dial until it for 5 secs, turn the dial until it ‘I:rt’ shows up ‘I:rt’ shows up shows ‘I:rt’.

  • Page 24: Fault Code History

    Chapter 3 How to use control panel Chapter 3 How to use control panel Change System Parameters Fault Code History System Reset P-920C P-920C P-920C P-920C P-920C P-920C HIGH HIGH HIGH HIGH HIGH HIGH Turn the dial until ‘3:In’ shows up. 10 recent fault codes can be viewed Press ‘current status button’ for 5 Press ‘current status button’ for 5 ‘3:In’ is displayed and then press by turning the dial. ‘1:EH’ is displayed and then press secs during panel power off to enter secs during panel power off to enter...

  • Page 25: Fan, Max Rpm Adjustment

    Chapter 3 How to use control panel Chapter 3 How to use control panel Fan, Max RPM Adjustment Cascade Mode Setting COMING SOON P-920C P-920C P-920C P-920C P-920C P-920C HIGH HIGH HIGH HIGH HIGH HIGH Turn the dial until ‘5:FH’ shows up. Turn the dial until ‘7:CA’ shows up. Press ‘current status button’ for 5 Press ‘current status button’ for 5 ‘5FH’ is displayed and then press ‘7: CA’ is displayed and then press secs during panel power off to enter secs during panel power off to enter...

  • Page 26: Cascade Master/Slave Setting

    Chapter 3 How to use control panel Chapter 3 How to use control panel Cascade Master/Slave Setting Reset Burner Operating Time P-920C P-920C P-920C P-920C COMING SOON P-920C P-920C HIGH HIGH HIGH HIGH HIGH HIGH Press ‘current status button’ for 5 Press ‘current status button’ for 5 Turn the dial until ‘11:dr’ shows up. Turn the dial until ‘9:Cn shows up. ‘11:dr’ is displayed and then press ‘9:Cn’ is displayed and then press secs during panel power off to enter secs during panel power off to enter...

  • Page 27: Agm Value Correction

    Chapter 3 How to use control panel Chapter 3 How to use control panel 1. Flame detection AGM Value correction HIGH HIGH HIGH ‘11:dr’ is displayed and then press the dial button for one second. After ‘A:GA’ being displayed by press- Press ‘dial button’ for 1 sec when ing ‘current status button’ for 5 secs, ‘J:AG’ shows up turn the dial until it shows ‘J:AG’. HIGH HIGH Press ‘dial button’ to save the setting. Turn the dial to ‘on’ status when initial ‘off’ shows up. (Default : off) 2. Gas Detection LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014...

  • Page 28: Error Code

    Chapter 3 How to use control panel Chapter 4 Troubleshootion Error code. 3. Sensing air pressure. Error Code Error Code Description Possible Remedies Press the Power button to clear the Error Code. If Error happens again: 1. Monitor the gas pressure to the water heater while in operation. Ensure pressure is between 3.5 and 14”...
  • Page 29 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code. Error code Meaning Cause Error Code Error Code Description Possible Remedies IMPORTANT: If you smell gas, STOP! Follow the instructions on page 2, this manual, and call a qualified service technician or the fuel gas utility. Gas Leakage is Detected Press the Power button to clear the Error Code.
  • Page 30 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause If the temperature on the water During ignition trials, if unit failed DHW overheating issue temperature sensor (tagged OP on Ignition failure to ignite 10 times continuosly, error (Automatic reset) Pppe) and the water outlet sensor (Manual reset) code 11 will appear.
  • Page 31 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause This water heater has two overheating switches. One attached at burner and the other at DHW outlet. These When exhaust vent or condensate Operating DHW overheating Air Pressure Switch open sensors act as dual safety device in blockages occur, error code 29 will switch (Manual reset) case of DHW temperature sensor’s appear.
  • Page 32 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause When DHW Inlet temperature Error is displayed when DHW Water Inlet Sensor error sensor wiring line located at DHW Water Outlet Sensor error outlet temperature sensor wiring (Automatic reset) inlet adapter is disconnected or (Automatic reset) line is disconnected or faulty.
  • Page 33 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause When exhaust temperature sensor When heat exchanger’s water Exhaust Temperature sensor Water temperature sensor error wiring line is disconnected or temperature sensor wiring line is error (Automatic reset) (Automatic reset) faulty. disconnected or faulty. Failure event Failure event Exhaust temperature sensor faulty or disconnected.
  • Page 34 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause Check EERPOM setting temperature is within 95~140℉. If false flame is detected after EEPROM error False flame sensing When EEPROM malfunctions,error combustion is ended, error code (Manual reset) (Automatic reset) occurs and all of the outputs will 39 will appear. stop except fan post-purge. Failure event Failure event When EEPROM malfunctions, error occurs and all of the outputs will stop except post-purge Flame is detected after combustion is ended.
  • Page 35 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause When gas leakage is detected Gas leakage When standard fan speed is during operation error code 40 will Excess fan speed detected (Manual reset) exceeded during combustion, error appear. (Manual reset) code 41 will appear Failure event Failure event When gas leak is detected for more than 10 minutes continuosly or 3 times in a hour, error code will...
  • Page 36 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause Burner plate overheating If burner temperature is higher Jumped wire disconnected Er 42 will appear if wire is protection switch open than the switch high limit (302 F), (Manual reset) disconnected. (Manual reset) error code 43 will appear. Failure event Failure event Jumped wire disconnected.
  • Page 37 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause Unable to operate normally due to Not able to supply hot water in DHW flow control valve error setting temperature when flow rate manual reset error. When flow rate Mixing valve error (Manual reset) (Manual reset) exceeds water heater maximum decreases temperature gap gets bigger. capacity Failure event Failure event Mixing valve operation error. Flow control valve opearation error. Check point Check point ① Mixing Valve recognizes zero point after turning off and on the power. Check indication of error after basically turning off and on the...
  • Page 38 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause Failed to control gas and air AGM Error mixture, the exhaust gas exceeds Flame detector error When flame is detected before (Manual reset) limits or causes noises. (Automatic reset) ignition, error code 72 appears. Hot water supplied is not reaching target setting Failure event Failure event AGM operation error.
  • Page 39 Chapter 4 Troubleshootion Chapter 4 Troubleshootion Error code Meaning Cause Error code Meaning Cause If exhaust NTC detects vent Board setting fault Exhaust temperature If DIP switch is abnormal, temperature higher than 149 ◦F, (Automatic reset) over heating fault 'Er 73' is displayed 'Er 94' is displayed. (Manual reset) Failure event Failure event DIP SWITCH abnormal. Exhaust temperature overheating issue. Check point Check point ①Check to see if the default DIP SWITCH...

  • Page 40: Replacement Instructions

    Chapter 5 Replacement instructions Chapter 5 Replacement instructions Main components Replacement Instructions Main components Replacement Instructions 1. Main Controller 2. Igniton Transformer 1. Close the gas shut off valve 6. Assembly is in the reverse order as the part was 1. Close the gas shut off valve 5. Remove two screws to separate ignition trans- 2. Turn the power off repaired. 2. Turn the power off former from the water heater cabinet. 3. Loosen two screws to remove main controller 3. Disconnect the electrical connection to the main cover. controller 4. Disconnect all the electrical connection to the main controller 5. Loosen two screws on both sides to remove main controller. 6. Separate ignition transformer from the bracket by unlocking the palstic pieces on the back side of the 4. Remove the cable connected to the igniter. bracket. 7. Open the gas shut off valve 8. Turn the power on 7. Replace ignition transformer with new component 9. Turn the unit on and ensure proper operation.

  • Page 41: Flame Detection Sensor

    Chapter 5 Replacement instructions Chapter 5 Replacement instructions Main components Replacement Instructions Main components Replacement Instructions 3. Flame Detection Sensor 4. Gas Leak Detector 5. Air pressure swtich (APS) 1. Close the gas shut off valve 1. Close the gas shut off valve 1. Close the gas shut off valve 5. Loosen Air Pressure switch bracket’s two 2. Turn the power off 2. Turn the power off 2. Turn the power off screws. 3. Disconnect all the electrical connection to the 3. Disconnect all the electrical connection to the 3. Disconnect the electrical connection to the APS main controller flame detection sensor 5. Pluck away PCB’s gas leakage detector.

  • Page 42: Gas Valve

    Chapter 5 Replacement instructions Chapter 5 Replacement instructions Main components Replacement Instructions Main components Replacement Instructions 6. Gas valve 7. Condensate Trap 1. Close the gas shut off valve 1. Close the gas shut off valve 6. Remove hose that connect connected from APS 5. Loosen fours screws to separate gas valve from 2. Turn the power off 2. Turn the power off to condensate trap. upper bracket 3. Disconnect all electrical connection to the gas 3. Removed condensate trap drain cap and ensure valve it is drained properly. 6. Loosen fours screws to separate gas valve from 7. Loosen 3 screws on the bottom of the cabinet lower bracket that holds condensate trap in place. 4. Loosen two screws to open the front cover. 4. Disconnect the gas line from the gas valve by loosing the nuts as shown. 5. Remove hose inlet hocse from the HX condensate pan connected to condensate trap. 7. Replace gas valve with new component. 8. Replace condensate trap with new component.

  • Page 43: Cold Water Inlet Filter Assembly

    Chapter 5 Replacement instructions Chapter 5 Replacement instructions Main components Replacement Instructions Main components Replacement Instructions 8. Flow Control valve 9. Cold Water Inlet Filter Assembly. 11. Mixing Valve 8. Separate flow control valve from DHW pipe and Separate flow control valve from DHW pipe and 1. Close the gas shut off valve 1. Close the gas shut off valve DHW inlet filter. DHW inlet filter. 2. Turn the power off 2. Turn the power off 3. Close all water valves and drain water from unit. 3. Close all water valves and drain water from unit. 4. Disconnect the electrical connection to the flow 4. Loosen two screws to open the front cover. control valve. 5. Loosen two screws to open the front cover. 5. Loosen two screws and remove temperature sensor connected with DHW inlet filter.

  • Page 44: Cold Water Inlet Filter

    Chapter 5 Replacement instructions Chapter 5 Replacement instructions Main components Replacement Instructions Main components Replacement Instructions 10. Cold Water Inlet Filter 11. Mixing Valve 12. Air Gas Mixer(AGM) 1. Close the gas shut off valve 1. Close the gas shut off valve 1. Close the gas shut off valve 6. Loosen gas pipe nut connected with AGM 2. Turn the power off 2. Turn the power off 2. Turn the power off 3. Close all water valves and drain water from unit. 3. Close all water valves and drain water from unit. 3. Separate intake pipe attached to AGM. 4. Place a bucket under the appliance to collect the 4 . L o o s e n t w o s c r e w s t o a c c e s s c o n t r o l l e r residual water inside the water heater.

  • Page 45: Bldc Fan Assembly

    Chapter 5 Replacement instructions Chapter 6 Maintenance Main components Replacement Instructions Cleaning Air Intake Filter 13. BLDC Fan Assembly To properly maintain the water heater, you should clean air intake filter every month. 6. Loosen gas pipe nut connected with AGM 1. Close the gas shut off valve 2. Turn the power off To clean air intake filter: 3. Separate intake pipe attached to AGM. 1. Press Power button on the control panel to turn off the water heater and turn off the gas valve. 2. Disconnect power supply to water heater. 3. Remove front cover of water heater. 4. Pull the filter out of air intake adapter. 7. Loosen burner plate bracket’s by loosen two screws as shown. 4. Remove AGM connector. 8. Loosen three screws to separate AGM cover and 5. Remove the filter from the plastic assembly and clean it with a small brush and clean running water. motor.(Loosen AGM’s two screw.) 6. Dry the filter completely and then reinsert the filter into the plastic assembly.
  • Page 46 Chapter 6 Chapter 7 Maintenance Components diagram Main components diagram and part list Flushing the Water Heater Flushing the Heat Exchanger is a complicated procedure that should only be performed by a qualified service technician. NOTE: Improper maintenance WILL AVOID water heater warranty. 1. Disconnect electrical power to the water heater. 2. C lose the shut-off valves on both hot water outlet and cold water inlet lines. (V1 & V2) 3. C onnect one hose “D1” to the valve “V3” and place the free end in the bucket. Connect one of the hoses “D3” to the circulation pump outlet and the cold water inlet line at the valve “V4”. Connect other hose “D2” to the circulation pump inlet and place the free end in the bucket. 4. Pour the tankless water heater cleaning solution into the bucket. Ensure the cleaning solution is approved for potable water systems. P lace the drain hose (D1) and the hose (D2) to the pump inlet into the cleaning solution. 5. O pen service valves (V3 & V4) on the hot water outlet and cold water inlet lines. 6. T urn on the circulation pump. Operate the pump and allow the cleaning solution to circulate through the water heater for at least 1 hour at a rate of 4 gallons per minute. This will remove any possible harmful scale deposits.
  • Page 47 Chapter 7 Components diagram Memo Main components diagram and part list NUMBER DESCRIPTION PART NUMBER NUMBER DESCRIPTION PART NUMBER HEAT EXCHANGER ASSY 7850P-032 35-6 METAL FIBER 7850P-075 31-1 EXHAUST PIPE ASSY (UP) 7850P-033 FLAME DETECTOR SENSOR 7850P-031 31-2 EXHAUST TEMPERATURE SENSOR 7850P-070 MIXING VALVE 7850P-054...
  • Page 48 Memo Memo LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014...

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