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12 

Electrical Connections 

 

WARNING:

 The heater must be electrically 

grounded. Follow the requirements of the local 
authority having jurisdiction. In the absence of 
such requirements, follow the latest edition of 
the National Electrical Code ANSI/NFPA 70 in 
the U.S., or the latest edition of CSA C22.1 
Canadian Electrical Code, Part 1, in Canada. 
Do not rely on the gas or water piping to 
ground the metal parts of the water heater. 
Plastic pipe or dielectric unions may isolate the 
water heater electrically. Service and 
maintenance personnel who work on or around 
the water heater may be standing on wet 
floors, and could be electrocuted by an un-
grounded water heater. 
 

CAUTION:

 Label all wires prior to 

disconnection when servicing controls. Wiring 
error can cause improper and dangerous 
operation. Verify proper operation after 
servicing. 
The MOBIUS water heater requires an 
electrical power supply from 120 VAC 60 Hz 
circuit and be properly grounded. 

  A means for switching on/off the 120 VAC 

power supply must be provided for service 
reasons. 

  Wire the heater exactly as shown in the 

wiring diagram. 

  A green screw is provided in the junction 

box for grounding connection. 

 

 

 

Refer to the wiring diagram. Wiring 
diagrams are also located on the inside 
panel of the appliance. 

Starting Operation 

 

For your safety please read before start 

and/or operating

 

a)  

This water heater 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, smell all around the 
water heater area for gas leaking. Be sure 
to smell next to the floor because some gas 
is heavier than air and will settle towards 
the floor. 

c)  

Use only your hand to turn the gas valve 
knob. Never use tools. If the knob will not 
turn by hand, do not try to repair it, call a 
qualified service technician. Force or 
attempted repair may result in a fire or 
explosion due to the gas leaking. 

d)  

Do not use this water heater if any part has 
been under water. Immediately call a 
qualified service technician to inspect the 
water heater and to replace any parts that 
has been under water. 

WHAT TO DO IF YOU SMELL THE GAS! 

 

1.  Do not try to start the water heater. 
2.  Do not touch any electric switch; do not 

use any phone in your building. 

3.  Immediately call your gas supplier from 

a neighbor’s phone. Follow the gas 
supplier’s instructions. 

4.  If you cannot reach your gas supplier, 

call the fire department. 

Operating Instructions 

 
The MOBIUS Water Heater is an 
instantaneous, tankless water heater designed 
to supply your entire household and/or 
commercial hot water needs utilizing total 
efficiency. The principle behind the MOBIUS 
Water Heater is simple. Once you open a hot 
water tap, water flows through the MOBIUS 
Water heater.  
The water flow sensor automatically 
commands the computer to electronically ignite 
the burners and the computer monitors the 
water temperature, water flow rate, and gas 

Summary of Contents for T - M1

Page 1: ...1 FAX 949 770 3171 http www takagi usa com Installation and Operating Instructions MOBIUS WATER HEATER MODEL T M1 Instantaneous Tankless Gas Water Heater Suitable for Potable water heating and Space h...

Page 2: ...st 36 37 Output temperature Chart 38 SPECIFICATIONS Natural Gas Input Min 25 000 Btu Max 235 000 Btu LPG Input Min 25 000 Btu Max 225 000 Btu Gas Connection NPT Water Connection NPT Water Pressure Min...

Page 3: ...result causing property damage personal injury or death Do not store or use gasoline or other flammables vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS D...

Page 4: ...ble drain pan under the unit which will not restrict combustible airflow 4 Check the rating plate for the correct gas type gas pressure water pressure and electrical rating If this unit does not match...

Page 5: ...hot water temperature want other than factory setting temperature 120 F please purchase the optional temperature remote controller part No TM RE10 With this optional part TM RE10 you can set the temp...

Page 6: ...all water have drained from unit 7 At this time please check the water filter located inside the cold inlet With a tiny brush clean the water filter of any calcium or debris which may have accumulated...

Page 7: ...t 6 Do not install the unit where the exhaust vent is pointing into any opening in a building or where the noise may disturb your neighbors Make sure the vent termination is 4 feet from a doorway or o...

Page 8: ...In the USA do not install the water heater vent terminator within 4 feet of any air intake opening into a building In Canada do not install the water heater vent terminator within 10 feet of any air i...

Page 9: ...s used to supply air to the water heater or utility room the installer should make sure it does not create drafts which could cause nuisance shutdowns If a blower is necessary to provide adequate comb...

Page 10: ...requirement as indicated in the latest edition of ANSI Z233 1 NFPA 54 The entire vent system must not exceed the size specified in table below Diam eter Max No of Elbow Max Vertical or Horizontal run...

Page 11: ...necting to the heater gas inlet WARNING Conversion of this unit from natural gas to propane or propane to natural gas cannot be done in the field Contact your local retailer or distributor to get the...

Page 12: ...lief valve must be installed on the hot water outlet A Tee fitting should be used to attach the pressure relief valve Then place the pressure relief valve 6 inches from water flow as shown in picture...

Page 13: ...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 smell all around the water heater ar...

Page 14: ...outlet temperature and flow rate combinations Based on the United States Department of Energy method of testing water heater output the Mobius is rated for 370 gallons per hour or 6 0 GPM at a 77 F r...

Page 15: ...nt panel of the appliance Electrical 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...

Page 16: ...lified service technician to inspect the water heater and to replace any damaged parts OPERATING INSTRUCTIONS 1 STOP Read the safety information above on this label and Owners Manual 2 Turn off all el...

Page 17: ...eavier than air 3 Travels a long way on the floor 4 Can be carried from other rooms to the main burner by air current WARNING Do not install water heater where flammable products will be stored Read a...

Page 18: ...es water for 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 pote...

Page 19: ...er 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...

Page 20: ...ow 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...

Page 21: ...nt the units from freezing in areas where cold air can be blown into the exhaust system Install vent damper according to manufacturer s installation instruction and any applicable codes 2 TK TV01 Vent...

Page 22: ...ature can be adjusted either with the optional remote controller Part TM RE10 from 95 F to 176 F or manually from the main computer control boards dipswitch Dipswitches can set four hot water output t...

Page 23: ...to 20 units for commercial and residential application with each computer controller One computer Part TM RE20 system can make from 25 000 BTU to 4 7 Million BTU system with fully automatic modulation...

Page 24: ...02 201 202 201 202 201 202 Detail Wiring T M1 Comunications cables are inside Box for TM RE20 TM RE10 Cable can be use above 18 gage wire and up to 250 ft Wire No 201 Male Adapter and No 202 Female Ad...

Page 25: ...rmanently but please keep this jump connector safety stored for future maintenance this jumper is located behind the do not remove label Firing System Power on each T M1 and TM RE20 then TM RE10 will...

Page 26: ...will be ON For Single or Multi mode JUMP cable For Multi mode permanently pull out Error signal LED this LED shows for unit error also it will show on RE 10 and RE20 Error codes are in Installation Ma...

Page 27: ...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 temperature that is...

Page 28: ...ng of an error code MOBIUS Water Heater Model T M1 has a built in self diagnostic computer programmed for safety and convenience for trouble shooting and maintenance service On the T M1 Computer Board...

Page 29: ...ec Open Valve A Open Valve B Open Valve C Display Display Priority Control Valve B Open Valve B Open Valve A 611 13 4 Valve A failure High limit switch off Open Short Inlet Temp Thermistor Open Short...

Page 30: ...ing Igniter Off Proportional control Check output temp 203F Check power Less normal Open Valve B improperly 2 minutes Fan Off Re ignite 2 times Valve H Off Valve D Off Valve G Off Igniter Off Valve H...

Page 31: ...Safety function Capacity Check Max BTU Flow sensor 8 45GPM Valve C control Valve C Close Capacity Check Max BTU Flow sensor 8 45GPM Valve C control Check power Mid BTU Valve E On Valve F Off Valve E...

Page 32: ...iled 510 Abnormal Main Gas Valve 721 Computer Pre post Check Problem 121 Loss Flame 541 Abnormal Two Way Valve 741 Main remote control Trouble 141 Hi Limit Switch Trip 611 Abnormal Fan Motor 751 Tempe...

Page 33: ...4 42 94 31 40 39 31 43 41 37 38 26 60 30 29 28 32 33 34 35 36 20 27 52 40 34 58 18 51 53 54 55 57 56 56 61 40 62 63 65 66 48 64 40 60 59 34 26 23 25 24 18 22 21 20 19 18 17 16 15 14 MOBIUS Water Heate...

Page 34: ...33 128 127 126 123 9 125 124 122 119 120 117 121 118 115 116 115 114 111 18 112 113...

Page 35: ...34 68 67 18 69 70 71 70 84 83 72 73 74 70 75 76 75 81 70 9 82 77 74 70 80 79 89 78 91 40 43 9 86 85 88 90 101 3 102 103 107 108 109 106 3 105 1 0 4 110 94 97 93 96 94 92 95 98 99 100 87...

Page 36: ...35 1 2 3 4 5 6 2 3 7 8 9 10 11 12 13 3...

Page 37: ...i Limit Switch 50 Screw W M4 x 12 17 Screw M3 x 6 51 Bypass Flow Adjustment Valve 18 Screw M4 x 10 coated 52 Bypass Valve 19 Outlet Thermistor 53 Silicon O ring M22 20 O ring P4 54 Bypass Connection 2...

Page 38: ...verheat Cut off Fuse 111 Computer Board 82 Damper 112 Computer Board Sticker 83 Washer 113 Mode Port 84 Pressure Switch Port 114 Control Box 85 Silicon Tube 115 Screw M3 x 25 86 Pressure Switch 116 Wi...

Page 39: ...ature Out Put Hot Water GPM 40 F 50 F 60 F 70 F 40 F 7 7 7 0 6 4 5 9 5 5 5 1 4 8 4 5 4 3 4 0 3 8 3 5 3 2 3 1 3 0 2 8 2 7 50 F 9 6 8 5 7 7 7 0 6 4 5 9 5 5 5 1 4 8 4 5 4 3 3 8 3 5 3 3 3 2 3 1 3 0 60 F 9...

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