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Takagi Flash Water Heater T-KD20, Installation Manual And Owner'S Manual

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Takagi Flash Water Heater T-KD20 Installation Manual And Owner'S Manual Download Page 16

 

16

Dual-purpose hot water heating (Domestic and Heating): 
 

 

 

Priority Control Devices: It has a capability to make priority system that can be used as a controller 
flow sensor, Aquastat, or electronic controller to controlling radiant, Hydro or baseboard heating 
equipments. 
 

Warning: 

Follow all local codes, or in the absence of local codes, follow the most recent edition of 

the National Standard Code, ANSI Z21. 10.3. 

 

Warning: 

This illustration is for concept only. There are a wide variety of variations to the 

application of controls and equipment presented applications. Designers must add all necessary 
safety and auxiliary equipment to conform to code requirements and design practice.  

Diagrammatic Layout of Radiant 

Heating and Domestic Water Heater 

Summary of Contents for Flash Water Heater T-KD20

Page 1: ...ation creates carbon monoxide gas and flue gases which can cause serious injury or death Improper installation and or operation or installation by an unqualified person will void warranty WARNING If the information in this manual 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 or liquids ...

Page 2: ...ch Settings 22 Indoor NG Dipswitch Settings 22 Outdoor NG Dipswitch Settings 22 Indoor LP Dipswitch Settings 23 Outdoor LP Dipswitch Settings 23 Exploded Diagrams 24 27 Parts List 28 Flow Chart 29 Specifications Natural Gas Input Min 20 000 Btu Max 185 000 Btu LPG Input Min 19 000 Btu Max 175 000 Btu Gas Connection NPT Water Connections NPT Water Pressure Min 15 psi Max 150 psi Natural Gas Pressur...

Page 3: ...Prevention Device will only work if the unit has proper electrical power The Freeze Prevention Device is rated for temperatures down to 5º F 15º C in a wind free environment The wind chill factor will cause the Flash Water Heater to freeze and be damaged at temperatures even above 5º F 15º C ambient temperature Refer to the sections on Winterizing and the Freeze Prevention Device for more informat...

Page 4: ...table temperature Turning It Off To turn off the Flash water heater 1 Close the hot water tap or turn appliance off 2 Flow will diminish unit will shut off 3 Fire On lamp will go out Temperature The output temperature of the T KD20 has been factory set for a maximum 120 F 50 C This is electronically controlled by the computer and can be adjusted with a TK RE01 temperature controller or with the di...

Page 5: ...occurs WARNING The pipe heaters are located on the Flash Water Heater only Any hot or cold water pipes located outside of the unit will not be protected Properly protect and insulate these pipes from freezing If the heater will not be in use for a long period of time or if the temperatures will drop below 5º F 15º C with the wind chill factor turn off heater and drain the unit of water This applie...

Page 6: ...it Electrical Connections The T KD20 requires a 60 Hz 120 VAC electrical power supply and it should be properly grounded in accordance with the most recent edition of the National Electrical Code ANSI NFPA 70 and any local codes In Canada all electrical wiring to the heater should be installed in accordance with the Canadian Electrical Code CSA C22 1 Part 1 and any local codes Do not rely on the g...

Page 7: ...l Rating 120 VAC 60 Hz 0 8 A Note If any of the original wiring supplied with this appliance must be replaced it must be replaced with appliance wiring material 180c or its equivalent Wires are available through the manufacturer ...

Page 8: ...8 ...

Page 9: ... to natural gas cannot be done in the field Contact your local retailer or distributor to get the correct unit for your gas type Always install a manual shutoff valve on the gas supply line in case of an emergency or if service or maintenance is necessary This appliance and its individual shut off valve must be isolated from the gas supply piping system by unplugging the unit and turning off the m...

Page 10: ...lled in any installation with this unit The pressure relief valve must be installed on the hot line out of the unit with no check valves or control valves between the unit and the relief valve The Pressure relief valve must be rated for 150 PSI Connect the discharge opening of the relief valve to a suitable drain to prevent water damage should discharge occur If the pressure relief valve discharge...

Page 11: ...a Category III gas vent for discharge pipe in order to direct the dangerous exhaust byproducts to the outdoors Connect the 4 Category III vent pipe to the minimum 2 round collar on through the outside wall This water heater must be vented in accordance with the section on venting of equipment in the latest edition of the National Fuel Gas Code This is a Category III appliance and must be vented ac...

Page 12: ...nstructions exactly a fire or explosion may result causing property damage personal injury or loss of life a This appliance does not have a pilot It is equipped with an electronic ignition device which automatically lights the burner Do not try to light the burner by hand b Before operating check for gas accumulation in the area around the appliance Pay special attention near the floor because gas...

Page 13: ... with a descaling solution Scale build up will void your warranty and shorten the life of your water heater Troubleshooting Water Isn t Hot Enough The T KD20 can burn gas at a maximum input rate of 185 000 BTUH This puts a limit on the possible output temperature and flow capabilities See flow chart on the last page of this manual If the water doesn t seem hot enough compare the flow and temperatu...

Page 14: ... problem with the electrical supply to the unit If that light does come on hit the green reset button above the light and look for the green light on the circuit plate at the top left of the unit If this light is not lit there is a problem with the electrical connection between the GFCI and the circuit plate Contact Takagi Industrial Company for Instructions Error Codes All Takagi units are self d...

Page 15: ...r space heating at temperatures higher than required for other used a means such as a mixing valve shall be installed to temper the water for those uses in order to reduce scald hazard potential Water temperature over 125 F can cause severe burns instantly or death from scalds Chemicals such as diluted Glycol can be used for radiant floor Hydro warm air or Baseboard heating only Basic system drawi...

Page 16: ...ning Follow all local codes or in the absence of local codes follow the most recent edition of the National Standard Code ANSI Z21 10 3 Warning This illustration is for concept only There are a wide variety of variations to the application of controls and equipment presented applications Designers must add all necessary safety and auxiliary equipment to conform to code requirements and design prac...

Page 17: ... flow rates for longer periods of time then it can be installed in conjunction with a storage tank A pump will be necessary to keep the water hot We suggest a pump of 1 12 hp or greater depending on the system Recirculation This system will also need a pump of 1 12 hp or greater depending on the application situation ...

Page 18: ...l a qualified service technician to inspect the water heater and to replace any damaged parts OPERATING INSTRUCTIONS 1 STOP Read the safety information above or in the Owners Manual 2 Turn off all electric power to the water heater 3 Do not attempt to light the burner by hand 4 Turn the gas manual gas valve located on the outside of the unit clockwise to the off position 5 Wait five 5 minutes to c...

Page 19: ... children or the infirm without supervised DANGER Hot Water Heater temperature over 125 F can cause severe burns instantly or death from scalding Children disabled and elderly are at the highest risk of being scalded Feel water temperature before bathing or showering Temperature limiting valves are available ask professional person WARNING California Proposition 65 lists chemical substances known ...

Page 20: ...20 ...

Page 21: ... can be blown into the exhaust system Install vent damper according to manufacturer s installation instruction and any applicable codes 2 TK TV01 Vent Terminator This terminator can be used where a T KD20 is going to be vented out through a wall This is a CSA approved part of the unit Connect a Category III Stainless vent pipe from the top of the unit to the backside of this terminator to exhaust ...

Page 22: ... 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 NG Indoor Temperature Settings 105 F 112 F 120 F 180 F ERROR Outdoor NG Dipswitch Settings 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 ...

Page 23: ...1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 LP Indoor Temperature Settings 105 F 112 F 120 F 180 F ERROR Outdoor LP Dipswitch Settings 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 4 3 2 1 ON 4 3 2 1 ON OUT NG LP IN 180 112 105 LP Outdoor Temperature Settings 1...

Page 24: ...24 Computer board assembly ...

Page 25: ...25 Case assembly ...

Page 26: ...26 Burner assembly ...

Page 27: ...27 Waterway assembly ...

Page 28: ...ING PLATE 22 O RING 67 GAS INLET 23 GASKET 68 FAN 24 QUICK RELEASE PLATE 69 SCREW 25 QUICK RELEASE PLATE 70 FAN DAMPER 26 SCREW 71 THERMOSTAT 27 FLOW SENSOR 72 SCREW 28 O RING 73 SCREW 29 INLET CONNECTION PIPE 74 PRESSURE SWITCH 30 O RING 75 SILICON TUBE 31 INLET THERMISTOR 76 PRESSURE SWITCH PORTPLATE 32 O RING 77 PRESSURE SWITCH PORT 33 WATER INLET 78 POWER DISTRIBUTION PLATE 34 FREEZE PROTECTIO...

Page 29: ...re 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 Output Temperature Gallon per Minuite 40 F 4 4 4 1 3 9 3 6 3 4 3 3 3 1 2 7 2 5 2 2 50 F 5 2 4 8 4 4 4 1 3 9 3 6 3 4 3 0 2 7 2 4 60 F 6 2 5 6 5 2 4 8 4 4 4 1 3 9 3 3 3 0 2 6 70 F 6 7 6 7 6 2 5 6 5 2 4 8 4 4 3 6 3 3 2 8 110 115 120 125 130 135 140 155 165 180 ...

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