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Bradford White M2TW75T*BN, Instructions Manual

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Bradford White M2TW75T*BN Instructions Manual Download Page 46

Bradford White

TTW

 Series

Gas Water Heaters

Table of Contents

Page

TTW Service Procedure

Introduction

 4

- - -

How to use this manual

 5

- - -

Tool required for service

 5

- - -

Specifications

 6

- - -

Control Timings

 8

- - -

Sequence of Operation

9

- - -

Troubleshooting

12

- - -

Burner Inspection, Cleaning and Replacement

 14

I

Pilot Testing, Cleaning 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 & Replacement

23

VI

Simulated Resistive Device Testing and Replacement

27

VII

Safety Circuit Voltage Trace

 28

VIII

115VAC Circuit Trace

 29

IX

Dip Tube inspection and Replacement

 30

X

Anode Inspection and Replacement

 31

XI

Flue Baffle Inspection and Replacement

 32

XII

Glossary of Terms

33

- - -

Parts List

 35

- - -

Page 2

2

Summary of Contents for M2TW75T*BN

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 32: ...32 Wiring Diagram Figure 10...

Page 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...

Page 34: ...34 Lighting and shutdown instructions...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 44: ...44 NOTES...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 78: ...NOTES Page 34 34...

Page 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...

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

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