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Six-four flash, three

second pause

Undesired-false

pilot flame

sensed.

System auto

resets.

Seven flash, three

second pause

Simulated

Resistive Device

Harness out of

specification.

Eight-one flash, three

second pause

Simulated

Resistive Device

Harness

specification

check.
Thermal well

sensor damaged

or unplugged

Eight-three flash, three

second pause

Gas valve

electronics fault

detected

LED Status

Control

Status

Service

Procedure

Probable Cause

Pilot valve stuck in open position.

Replace gas control,

page 25

Simulated resistive device out of specification.

Page 27

Simulated resistive device out of specification.

Page 27

1. Damage to thermal well wire.

2. Thermal well sensor resistance out of range.

Page 23

1. Control needs to be reset.

2. Control is wet or physically damaged.

1. Interrupt power supply

2. Replace gas control,

 page 25

Eight-four flash, three

second pause

Gas valve fault

detected.

1. Control needs to be reset.

2. Control is wet or physically damaged.

1. Interrupt power supply

2. Replace gas control,

 page 25

Troubleshooting

Six-three flash, three

second pause

Pilot flame

extinguished.

System auto

resets.

1. Unstable pilot.

2. Pilot tube blocked or restricted.

3. Oxidation build up on pilot electrode.

4. Wire damage to pilot assembly or bad

 connection at gas valve.

5. Insufficient combustion air.

6. Gas pressure is out of specification.

1. Page 14

2-4. Page 16

5. Refer to installation manual

Page 13

Six-two flash, three

second pause

Pressure switch

or blower temp

switch opened

during burner

operation.

System auto

resets.

1. Check vent or vent tables.

2 & 3 Page 17

4. Refer to venting section of

 installation manual

5. Page 19

6 & 7 Page 21

1. Vent blockage or improper vent configuration.

2. Pressure switch tubing kinked or blocked.

3. Faulty pressure switch.

4. Vent termination being affected by wind

5. Blower not spinning up to speed.

6. Blower temp or exhaust temp too high

7. Faulty blower temperature switch.

Six-one flash, three

second pause

Failed to light

pilot.

System auto

resets.

1. Unstable pilot.

2. Pilot tube blocked or restricted.

3. Oxidation build up on pilot electrode.

4. Wire damage to pilot assembly or bad

 connection at gas valve.

1. Page 14

2-4. Page 16

13

Содержание M2TW75T*BN

Страница 1: ...hone 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...

Страница 2: ...he installation of this water heater We require that you carefully read this manual as well as the enclosed warranty and refer to it when questions arise If you have any specific questions concerning...

Страница 3: ...for 40 Gal 151 4 L 50 Gal 189 2 L 17 Vent Pipe Preparation and Joining 23 Combustion Air Supply 25 Water Connections 27 Gas Connections 30 Electrical Connections 31 Wiring Diagram 32 GENERAL OPERATION...

Страница 4: ...y the warranty Do not use this appliance if any external part to the tank has been submerged in water You should contact a qualified service technician to inspect the appliance and to replace any part...

Страница 5: ...e installed in compliance with the National Fuel Gas Code ANSI Z223 1 Latest Edition and or in Canada CAN CGA B149 Installation Codes Latest Editions The location of this water heater is of the utmost...

Страница 6: ...ER HEATER To comply with NSF requirements this water heater is to be a Sealed to the floor with sealant in a smooth and easily cleanable way or b Installed with an optional leg kit that includes legs...

Страница 7: ...t be at least 3 4 inch 1 9 cm in diameter and pitched for proper drainage It is recommended that a minimum clearance of four 4 inches 10 2 cm be provided on the side of the water heater for servicing...

Страница 8: ...l The minimum clearances to combustibles for this water heater are zero 0 inch 0 cm from the sides and rear five 5 inches 12 7 cm from the front of the jacket zero 0 inch 0 cm from the vent connector...

Страница 9: ...t 2 13 m M Clearance under a veranda porch deck or balcony 12 inches 30 cm b 1 In accordance with the current CAN CGA B149 Installation Codes 2 In accordance with the current ANSI Z223 1 Latest editio...

Страница 10: ...pipe can be installed with a downward slope not less than 1 8 3 cm and away from the blower 2 In order to prevent condensate from draining back into the blower vertical or horizontal runs an optional...

Страница 11: ...2 lists the venting distances allowed with 4 10 2 cm diameter vent pipe When venting with 4 10 2 cm vent pipe use a 4 10 2 cm to 3 7 6 cm reducer to exit through the building wall with 3 7 6 cm vent...

Страница 12: ...Roof 1 175 53 3 175 53 3 15 4 6 Through the Roof 2 170 51 8 170 51 8 15 4 6 Through the Roof 3 165 50 3 165 50 3 15 4 6 Through the Roof 4 160 48 8 160 48 8 15 4 6 NOTE When using 4 10 2 cm vent pipe...

Страница 13: ...per cement to secure the 90 vent terminal provided with the water heater to the vent connector The distance between the edge of the 90 vent terminal and the exterior wall see Figure 3 must be 1 in 2 5...

Страница 14: ...local codes and or The National Fuel Gas Code ANSI Z223 1 Latest Edition or CGA CAN B149 Installation Code latest edition Figure 4 NOTE For installations requiring both horizontal and vertical runs th...

Страница 15: ...hrough the wall at a height greater than or equal to 12 30 5 cm above the ground or anticipated snow level the installation must be modified as shown below see Figure 5 Refer to Table 3 for maximum ve...

Страница 16: ...S Max straight Length ft m Terminating Reduce 4 to 3 Reduce 10 1 cm to 7 6 cm of Elbows 48 65 gal 25 55 and 75 gal Min straight Length ft m 2 90 Elbows with 1 90 Elbow 1 160 48 8 160 48 8 10 3 1 2 90...

Страница 17: ...lists the venting distances allowed with 3 7 6 cm diameter vent pipe When venting with 3 7 6 cm vent pipe use a 3 7 6 cm to 2 5 1 cm reducer to exit through the building wall with 2 5 1 cm vent pipe...

Страница 18: ...l 5 95 29 0 10 3 1 Through the Roof 0 120 36 6 15 4 6 Through the Roof 1 115 35 15 4 6 Through the Roof 2 110 33 5 15 4 6 Through the Roof 3 105 32 0 15 4 6 Through the Roof 4 100 30 5 15 4 6 NOTE Whe...

Страница 19: ...t connector The distance between the edge of the 45 vent terminal and the exterior wall see Figure 7 must be at least 1 in 2 5 cm Use the proper cement and assembly procedures to secure the vent conne...

Страница 20: ...the necessary holes through the roof and ceiling and install the vent connector as shown in Figure 8 Make sure that the installation meets the local codes and or The National Fuel Gas Code ANSI Z223...

Страница 21: ...must be modified as shown below see Figure 9 Refer to Table 7 for maximum venting lengths using 2 5 1 cm vent pipe or Table 8 for maximum lengths using 3 7 6 cm vent pipe Figure 9 NOTE For installatio...

Страница 22: ...LLATIONS Terminating Reduce 3 to 2 Reduce 7 6 cm to 5 1 cm of Elbows Maximum Length ft m Minimum Length ft m 2 90 Elbows with Vent Terminal 1 100 30 5 10 3 1 2 90 Elbows with Vent Terminal 2 95 29 0 1...

Страница 23: ...oining of pipe and fittings a Cutting Tools i A square cut must be achieved with a miter box saw or pipe cutter to ensure a proper mating with the female If a pipe cutter is used the burr created at t...

Страница 24: ...at around the end of the pipe 4 Joining a Joints should be made immediately after cement is applied b After fully inserting pipe into fitting socket hold joint together for about 15 to 20 seconds c Re...

Страница 25: ...ple weather stripping heavily insulated caulked vapor barrier etc additional air may need to be provided using the methods described under CONFINED SPACES All Air From Outdoors or Specially Engineered...

Страница 26: ...ly or by ducts with the outdoors or spaces crawl or attic that freely communicate with the outdoors 1 When directly communicating with the outdoors each opening must have a minimum free area of 1 squa...

Страница 27: ...on DO NOT operate this water heater in a closed system without provisions for controlling thermal expansion Your water supplier or local plumbing inspector should be contacted on how to control this s...

Страница 28: ...relief valve into the opening provided and marked for this purpose on the water heater Note Some models may already be equipped or supplied with a combination temperature and pressure relief valve Ve...

Страница 29: ...ocal plumbing supplier Please consult with a plumbing professional APPROXIMATE TIME TEMPERATURE RELATIONSHIPS IN SCALDS 120 F More than 5 minutes 125 F 1 to 2 minutes 130 F About 30 seconds 135 F Abou...

Страница 30: ...pply pipe dope to the gas valve inlet and make certain that no pipe dope has become lodged in the inlet screen of the gas valve Extreme care must be taken to ensure no pipe dope enters the gas valve A...

Страница 31: ...y a switch that is used to turn on and off lights If wiring in conduit is required cut the flexible line cord flush with the bushing Remove the junction box cover and pull the pressure switch outside...

Страница 32: ...32 Wiring Diagram Figure 10...

Страница 33: ...ter heater 3 Close the cold water supply shut off valve 4 Open the drain valve on the water heater by turning the stem counter clockwise The drain valve has threads on the end that will allow the conn...

Страница 34: ...34 Lighting and shutdown instructions...

Страница 35: ...eater is equipped with an energy cut out device to prevent overheating Should overheating occur turn off the electrical supply to the water heater and contact a qualified service technician Thermostat...

Страница 36: ...isappear and the flame becomes blue On 75 gallon models fired on LPG or propane adjust the air shutter as described above until the yellow flame is minimized note the burner flame may contain a mixtur...

Страница 37: ...ames to determine that they are burning properly See Burner Flame Check section on page 36 If sooting or other burner anomalies are evident shut down the water heater by turning off the gas per the in...

Страница 38: ...closed water supply system Contact the water supplier or local plumbing inspector on how to correct this situation Do not plug the combination temperature and pressure relief valve outlet 9 A combinat...

Страница 39: ...pplier Supplier Phone No CAUTION FOR YOUR SAFETY DO NOT ATTEMPT REPAIR OF COMBINATION GAS CONTROL BURNERS OR GAS PIPING REFER REPAIRS TO A QUALIFIED SERVICE TECHNICIAN Manufactured under one or more o...

Страница 40: ...eat Tank temperature below set point of thermostat 1 Unstable pilot 2 Pilot tube block or restricted 3 Oxidation build up on pilot electrode 4 Wire damage to pilot assembly or bad connection at gas va...

Страница 41: ...ts Six flashes three flashes three second pause Soft lockout Pilot flame extinguished System resets after 5 minutes 1 Unstable pilot 2 Pilot tube blocked or restricted 3 Oxidation build up on pilot el...

Страница 42: ...not shown 12 Anode Nipple 3 Blower temp switch not shown 13 Air Shutter Cast Iron Only 4 Flue Baffle or Flue Core 14 T P Relief Valve Opening 5 Water heater control 15 Pilot Assembly 6 Drain Valve 16...

Страница 43: ...used for boiler treatment must not be introduced into potable water used for space heating 3 This water heater must not be connected to an existing heating system or component s previously used with...

Страница 44: ...44 NOTES...

Страница 45: ...7150A SERVICE MANUAL For Bradford White TTW Series Models M2TW75T BN CX TW475S76 B C N X Denotes Warranty Years Gas Water Heaters TTW 75 SERIES Troubleshooting Guide and Instructions for Service To be...

Страница 46: ...and Replacement 16 II Pressure Switch Testing and Replacement 17 III Blower Testing and Replacement 19 IV Blower Temperature Switch Testing and Replacement 21 V Gas Control Thermal well Testing Repla...

Страница 47: ...DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT CERTAIN OF THE FOLLOWING Liquefied petroleum gases propane gas and natural gas have an odorant added by the gas supplier that aids in the detec...

Страница 48: ...promote error free wiring Increased Vent Lengths increased venting performance is achieved while maintaining Energy Factor FHSR performance The TTW2 TW4 water heaters use a combustion system were flu...

Страница 49: ...sed to measure gas and or air pressure and vacuum Multi Meter A digital type is strongly recommended This device is used to measure electrical values The meter you select must have the capability to m...

Страница 50: ...supply Dedicated 115VAC 60 Hz 15A Approved Gas Type Natural or Propane Unit must match gas type supplied Venting System Power vent through the wall or vertical through the roof Approved Vent Materials...

Страница 51: ...th ft m 4 Diameter 10 2 cm PVC Vent Connector Lengths 1 175 53 3 10 3 1 Through the Wall 2 170 51 8 10 3 1 Through the Wall 3 165 50 3 10 3 1 Through the Wall 4 160 48 8 10 3 1 Through the Roof 0 50 1...

Страница 52: ...ry after 2 Minutes Soft Lockout Retry after 5 Minutes TCO Limit Lockout Indefinite cycle power to restart Simulated Resistive Load Lockout Indefinite cycle power to restart Hardware Error Lockout Inde...

Страница 53: ...operation with no perceptible delay If the device is out of range the control LED immediately flashes 7 times with 3 second pause Normal Heating Sequence 1 2 Blower energizes 3 Pressure switch proves...

Страница 54: ...30 seconds the gas control proceeds to verify resistive delay for 2 minutes and flashes 8 times then once with a three second pause This process is repeated 5 times until the control either returns t...

Страница 55: ...hed the gas control turns off the blower and flashes 6 times then 2 times with 3 second pause The gas control waits 5 minutes before repeating ignition sequence 4 Trial For Ignition Fault a Pressure s...

Страница 56: ...on pilot electrode 4 Wire damage to pilot assembly or bad connection at gas valve 1 Page 14 2 4 Page 16 1 Pressure switch tubing kinked or blocked 2 Blocked pressure tap on switch or blower 3 Faulty...

Страница 57: ...upply 2 Replace gas control page 25 Troubleshooting Six three flash three second pause Pilot flame extinguished System auto resets 1 Unstable pilot 2 Pilot tube blocked or restricted 3 Oxidation build...

Страница 58: ...ot flame should be stable some causes for an unstable pilot flame are a Water heater vent is less than the allowable vent length b Gas pressure is out of specification c Pilot flame not fully engulfin...

Страница 59: ...ner port area Step 9 Unscrew burner from main burner orifice On cast iron burners loosen air shutter nut and unscrew feedline from burner Step 10 Remove main burner orifice from feedline wrench on ste...

Страница 60: ...niter flame sense electrode for deterioration Replace pilot as necessary Electrode should not be in contact with pilot hood If so carefully adjust electrode to a gap distance of 3 32 09 from pilot hoo...

Страница 61: ...kage Is there blockage Replace switch see page 18 Position gas valve power switch to the ON position and adjust thermostat to call for heat this will start the blower Check with multi meter do pressur...

Страница 62: ...cover from step 2 Step 1 Position gas control power switch to OFF position Step 2 Remove the three screws Phillips screw driver from control access cover on blower assembly and remove cover see photo...

Страница 63: ...re of 2 15 to 2 30 W C Step 1 Position gas control power switch to ON position and adjust control to call for heat Step 2 Remove the three screws Phillips Screw driver from control access cover on blo...

Страница 64: ...Clean any debris from jacket head of water heater Step 9 Set new blower with gasket in place using locating pins on blower flange to line up with location holes in jacket head Be sure not to damage ga...

Страница 65: ...2 Remove the three screws Phillips screw driver from control access cover on blower and remove cover see photo 14 Step 3 Locate blower temperature switch see photo 15 Reconnect wire leads and observe...

Страница 66: ...Step 4 Disconnect red and yellow wire leads from switch Step 5 With an appropriate tool such as side cutters snip the retaining lug from the blower housing to allow removal of temperature switch see p...

Страница 67: ...tion see photo 20 Replace thermal well see page 25 Using a multi meter set to the Ohms setting determine the resistance of thermal well sensors 1 2 see photos 19 20 Disconnect thermal well wire harnes...

Страница 68: ...emperatures Example If temperature of water is 84 F then the resistance through the sensor would be 8449 see shaded area NOTE Sensor resistance increases as the temperature falls WARNING Stored water...

Страница 69: ...er heater and disconnect gas piping from gas control Step 3 Disconnect wire harnesses burner assembly from gas control Step 4 Using gas control service tool 239 45991 00 available from your BWC parts...

Страница 70: ...on Thermal well flange slots Gas control Tabs TTW SERVICE PROCEDURE VI Gas Control Thermal Well Testing and Replacement Page 26 24 25 Step 1 Install threaded end of thermal well into tank Be sure ther...

Страница 71: ...sistive device from gas control Step 3 Using a multi meter set to the ohms setting check resistance of simulated resistive device Resistance must be within 25 000 ohms and 45 000 ohms If outside of th...

Страница 72: ...hear or can you see the igniter sparking Y Y Is LED on gas valve flashing the heartbeat code alternating bright dim N Safety circuit voltage is OK No voltage from gas control call for technical suppor...

Страница 73: ...meter set to volts AC is there 120VAC across terminals shown in photo 29 N Y 28 29 Reconnect cord set shown in photo 28 Repair damage Check for damage to AC supply power cord Y N Replace Blower 32 Che...

Страница 74: ...t inlet nipple dip tube Inlet nipple dip tube should be free of cracks and any blockage Hydro jet slots should be open and free of any blockage Any damage such as cracks restriction due to deformation...

Страница 75: ...eads Step 5 Visually inspect outlet nipple anode Outlet nipple anode should show signs of depletion this is normal If depletion is of the original anode diameter approximately diameter replacement is...

Страница 76: ...Step 8 Reinstall baffle into flue tube Be sure baffle hanger tab are inserted into notch location at the top of the flue tube see photos 35 36 Step 9 Check Burner to insure no scale has accumulated d...

Страница 77: ...Hertz KW h Kilowatts per hour LED Light Emitting Diode NPT National Pipe Thread Ohms Ohms of resistance PSI Pounds per Square Inch RPM Revolutions per Minute TCO Temperature Cut Off VAC Volts Alternat...

Страница 78: ...NOTES Page 34 34...

Страница 79: ...NPT Plug 18 Burner Assy Nat 19 Burner Head 20 Main Burner Orifice 21 Pilot Assy Nat 22 Pilot Orifice 23 Feedline 24 Burner Assy L P 25 Cast Iron Burner 26 Pilot Assy L P 27 Pilot Orifice L P 28 Feedl...

Страница 80: ...Email parts bradfordwhite com techserv bradfordwhite com www bradfordwhite com...

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