Instruction/ maintenance manual of the product M2TW50T BN Bradford-White Corp
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Save this manual for future reference Manual 45960A (*) Denotes Warranty Years (To be performed ONLY by qualified service providers) For Bradford White TTW Series Models: M1TW40S*(BN,CX)1 M1TW50S*(BN,.
Page TTW Service Procedure Introduction 4 - - - How to use this manual 5 - - - Tool required for service 5 - - - Specifications 6 - - - Control Timings 9 - - - Sequence of Operation 10 - - - Troublesh.
WARNING: If the information in these instructions i s not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. 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.
Page 4 Introduction The new Bradford White TTW1, TTW2 & TW4 water heaters are designed to provide reliable performance with enhanced standard features. New design features include reliable spark to pilot ignition system, enhanced diagnostics, simplified servicing, significantly quiet operation and additional vent lengths.
It is intended for this manual to be used by qualified service personal for the primary purpose of troubleshooting and repair of the Bradford White TTW Series water heaters. Understanding the sequence of operation section of this manual will contribute greatly to troubleshooting the water heater.
Specifications Thermal well TCO Limit Residential 188°F (87°C), Co mmercial 199°F (93°C) Residential Temperature Set Point Range 60°F (16°C) to 160°F (71° C) (Approximate temperatures) Blower Temperature Switch Normally closed, op ens @ 165°F (74°C), auto reset @ 130°F (54 °C).
Specifications Venting Specifications for: 40 Gallon 50 Gallon Through the Wall Terminating # of Elbows Maximum Straight Length ft (m) Minimum Straight Length ft (m) 2" Diameter (5.1 cm) PVC Vent Connector Lengths 1 45 (13.7) 2 (.6) Through the Wall 2 40 (12.
Specifications Venting Specifications for: 48 Gallon 65 Gallon Through the Wall Terminating # of Elbows Maximum Straight Length ft (m) Minimum Straight Length ft (m) 3" Diameter (7.6 cm) PVC Vent Connector Lengths 1 55 (16.8) 2 (.6) Through the Wall 2 50 (15.
Control Timings Ignition State Timing Pre-purge 2 Seconds Trial for Ignition 90 Seconds Flame Stabilization Period 3 Seconds Inter-purge 15 Seconds Flame Failure Response Time 1.
Sequence of Operation Thermostat calls for heat. Prior to energizing blower, gas control checks safety circuit to insure the circuit is open. Normal switch positions in the safety circuit are a s follows: a) Pressure switch normally op en. b) Blower temperatu re switch normally closed.
Steady state operation. D uring Steady State Operation the Control Monitors: Thermostat temperature sensor- When s et point temperature is satisfied, gas valve is shut down and blower will post purge for 15 seconds. Control LED flashes a short flash once every 4 second s (idle) status code.
Sequence of Operation 3. Pressure Switch/Blower Temperature Fault: a) Pressure switch closed at s tart of call for heat - The gas control waits four se conds then, proceeds to flash 2 times with 3 second pause. Th e control waits 2 minutes and then turns on b lower for 30 seconds.
Short flash, once every four seconds “Heartbeat”, alternates bright/dim Thermostat calling for heat (no fault). Short flash once every 3 second Weak pilot signal on last call for heat. Two flash, three second pause Pressure switch not working- closed position.
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.
S t ep 1 . W i th m a in b u rn e r i n o p e ra t i o n , r e m o ve o u te r j a ck e t d oo r a nd s l i de i n n er d o or f r o m l e f t t o r ig h t t o o p e n.
B u rn e r C le a n i n g S t ep 1 . P o si t i o n g a s co n t r o l p o w e r s w i tc h t o t h e “ O FF ” p os i t i o n a n d un p l ug h e a te r f r om w a ll o u tl e t . S t ep 2 . T u rn o f f ga s su p p l y t o w at e r he a t e r . S t ep 3 .
TTW SERVICE PROCEDURE II Pilot testing, Cleaning and Replacement P i lo t I ns p e c t io n , Te s t i n g a n d R e p l a ce m e n t S t ep 1 . P o si t i o n g a s co n t r o l p o w e r s w i tc h t o t h e “ O FF ” p os i t i o n a n d un p l ug h e a te r f r om w a ll o u tl e t .
TTW SERVICE PROCEDURE III Pressure Switch Testing and Replacement Pressure Switch Testing WARNING 115 volt potential exposure. Use caution making voltage checks to avoid personal injury. S t ep 1 . P o si t i o n p o w e r s w i tc h o n g a s c on t r o l t o t h e “O F F ” po s i t io n .
Pressure Switch Replacement WARNING 115 volt potential exposure. Use caution to avoid personal injury. S t ep 6 . R e co n n e ct w i r es f r o m s t e p 5 t o n e w p re s s u re s w i tc h . S t ep 7 . R e co n n e ct t u b in g t o n e w pr e s s u re s w i tc h .
TTW SERVICE PROCEDURE IV Blower Testing and Replacement WARNING 115 volt potential exposure. Use caution when making voltage checks to avoid personal injury. Blower Testing Is there 115VAC across terminals shown in photo 12 ? Incorrect supply voltage polarity Determine power source problem and correct.
TTW SERVICE PROCEDURE IV Blower Testing and Replacement S t ep 1 . P o si t i o n g a s c on t r o l p o w e r s w i tc h t o t h e “ OF F ” po s i t i on . S t ep 2 . U n pl u g b lo w e r p o w e r c o r d f r o m wa l l ou t l e t . S t ep 3 . D i sc o n n e ct v e nt s y s te m f ro m e x ha u s t a d a p t er o n to p o f b l ow e r .
TTW SERVICE PROCEDURE V Blower Temperature Switch Testing and Replacement Blower Temperature Switch Testing. WARNING 115 volt potential exposure. Use caution to avoid personal injury.
TTW SERVICE PROCEDURE V Blower Temperature Switch Testing and Replacement Blower Temperature Switch Replacement. WARNING 115 volt potential exposure. Use caution to avoid personal injury. S t ep 1 . P o s it i o n g a s c on t r o l p o w e r s w i tc h t o t h e “ OF F ” po s i t i on a n d u n p l ug h e at e r f ro m w a ll o u tl e t .
Thermal Well Testing P osition gas valve power s witch to the “OFF” position and disconnect thermal well harness from gas control. N Y U s in g a m u l t i -m e t e r s e t to t h e o h m s s e t .
°F 0 1 2 3 4 5 6 7 8 9 40 26 109 2 54 00 24 712 2 40 45 23 399 2 277 1 22 163 2 15 73 21 000 204 45 50 19 906 1 93 83 18 876 1 83 83 17 905 1 744 0 16 990 1 65 53 16 128 157 15 60 15 314 1 49 25 14 5.
TTW SERVICE PROCEDURE VI Gas Control & Thermal Well Testing and Replacement Gas Control & Thermal Well Removal From Water Heater S t ep 1 . P o si t i o n g a s va l v e po w e r sw i t c h t o t he “ O F F” p os i t i o n a n d U n p l u g H e a t er f r om p o w er s u pp l y .
Gas Control Assembly to Thermal Well S t ep 6 . R e co n n e c t w i r e h a r n es s e s to g a s c o n t ro l p e r t h e i l l u s tr a t i on . S t ep 7 . R e co n n e ct g a s p i p i n g t o ga s c on t r o l . R e st o r e g a s s up p l y a n d c he c k fo r g a s l e ak s .
P age 28 TTW SERVICE PROCEDURE VII Simulated Resistive Device Testing Simulated Resistive device S t ep 1 . P o si t i o n p o w e r s w i t ch o n ga s c on t r o l t o t he “ OF F ” p os i t i on . S t ep 2 . D i sc o n n e ct s i mu l a t e d r e s is t i v e d e v i ce f r o m g a s c o n tr o l .
TTW SERVICE PROCEDURE VIII Safety Circuit Voltage Trace Safety Circuit Voltage Trace WARNING 115 volt potential exposure. Use caution making voltage checks to avoid personal injury.
TTW SERVICE PROCEDURE IX 115 VAC Trace WARNING 115 volt potential exposure. Use caution making voltage checks to avoid personal injury. Disconnect cord set as shown in photo 28 LED status None, Control LED not on or flashing. Step 1. Verify 115VAC and proper polarity at wall outlet.
TTW SERVICE PROCEDURE X Dip Tube Inspection and replacement S t ep 1 . Po s i t io n o n /o f f s wi t c h of g a s c o n t ro l v a lv e t o “ O F F” p o s it i o n a n d u np l u g w a t e r h e a t e r f r o m w a l l o u t l et . S t ep 2 . Tu r n of f c o ld w a te r s u pp l y t o w a t er h e a te r .
TTW SERVICE PROCEDURE XI Anode Inspection and replacement S t ep 1 . Po s i t io n o n /o f f s wi t c h of g a s c o n t ro l v a lv e t o t h e “ O F F ” p o s i ti o n a nd u n pl u g w at e r h ea t e r f r o m wa l l o u tl e t . S t ep 2 . Tu r n of f c o ld w a t er s u pp l y t o w a t e r h e a t er .
TTW SERVICE PROCEDURE XII Flue Baffle Inspection and replacement S t ep 1 . P o s it i o n g a s c o nt r o l p o w e r s w i tc h t o t h e “ OF F ” po s i t i on a n d u n p lu g b l ow e r fr o m wa l l o ut l e t . S t ep 2 . D i sc o n n e ct v e nt s y s te m f ro m e x ha u s t ad a p t er o n to p o f b l ow e r .
NOTES Page 34 Glossary of Terms BTU British Thermal Units GPM Gallons per Minute Hz Hertz KW/h Killo-watts 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 Alternating Current W.
Parts List 1. Blower Complete 2. Air Mixing Inlet cover 3. Pressure Switch 4. Blower Temp. Switch 5. Blower Gasket 6. Blower Power Cord 7. Vent Adapter 8. Condensate Hose Kit 9. Flue Reducer (M2 only) 10. Heat Trap Outlet 11. Hot Water Outlet Anode 12.
Email parts@bradfordwhite.com techserv@bradfordwhite.com www.bradfordwhite.com www.bradfordwhitecanada.com.
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