Honeywell PDX75S70F(B,S,C)*(N,X) - Manuals

Tools R equired for Service 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 PDX Series water heaters. Understanding the sequence of operation section of this manual will contribute greatly to troubles...

Specifications Thermal well TCO Limit Residential 188 ° F ( 87 ° C ) , Commercial 199 ° F ( 9 3° C ) Residential Temperature Set Point Range 60 ° F ( 16 ° C ) to 160 ° F ( 71 ° C ) ( Approximate temperatures ) B lower Temperature Switch Normally closed, opens @ 155 ° F ( 68 ° C ) , auto reset @ 128 ...

Specifications V e nt i n g Sp e ci f ic a t i o n s f o r : 48 Gallon65 Gallon75 Gallon T h is w ater h eater is approved for installation w it h t h e follo w ing PVC, CPVC or ABS Sc h ed u le 40 venting material. T h e maxim u m and minim u m vent lengt h s listed on t h is label are for t h e ex...

Specifications Pa r t II-Vent i ng Sp e ci f ic at i ons fo r : 40 Gallon50 Gallon Th r ough the W all Te r m i nat i ng # of Elbows ( ex c l. vent te r m. ) Max i mum st r a i ght Length ft (m) VE N T CO NN ECTO R LE NG TH S FO R 2 " (5.1 cm) DIAMETER VENT PIPE 1 3 0 (9.1) Th r ough the W all 2...

Control Timings Ig niti o n State Ti m in g Pre - purge 15 Secon d s Trial for I gnition 90 Secon d s F lame Sta b ili z ation Perio d 3 Secon d s I nter - purge 15 Secon d s F lame F ailure Response Time 1 . 5 Secon d s ( 2 secon d . Ma x imum ; 1 secon d minimum . ) Post - purge 15 Secon d s PS F ...

Se q uence of Ope r ation Thermostat calls for heat. P r i or to e n er gi z ing b lo w er , g as co n trol checks safet y c i rc ui t to in s u re the c i rc ui t i s o p e n . Normal s wi tch p os i t i o n s in the safet y c i rc ui t are as follo w s: a) E xha u st p ress u re s wi tch n ormall ...

Steady state operation. Du rin g Steady State Operation t h e C ontrol M onitors: Th ermostat temperature sensor - Wh en set point te m perat u re is satis f ied , g as v al v e is s hu t do w n and b lo w er w ill post p u r g e f or 1 5 se c onds. C ontrol L ED f las h es a s h ort f las h on c e ...

Se q uence of Ope r ation 3 . Pressure Switch/Blower Temperature Fault : a) P r e ss u r e sw itc h clo s e d at s ta r t of call fo r h eat - The co n trol waits f our seco nd s the n, procee d s to f lash 2 times with 3 seco nd pause. The co n trol waits 2 mi n utes a nd the n tur n s o n b lower ...

S hort f lash , once e v er y f our secon d s “ H eart b eat ” , alternates b right / d im Thermostat calling f or heat ( no f ault ) . S hort f lash once per secon d W ea k pilot signal on last call f or heat . T w o f lash , three secon d pause Pressure s w itch not w or k ing - close d position ....

S i x - f our f lash , three secon d pause Undesired - fa l se pi l ot f l ame sensed . System auto resets . S e v en f lash , three secon d pause Fl ammab l e Vapor Sensor fau l t detected E ight - one f lash , three secon d pause Fl ammab l e Vapor Sensor out of specification . Therma l we ll sens...

Step 1. With main burner in operation, remove outer jacket door remove inner door as described in this manual, see inner door removal, inspection and replacement section (page 35). Step 2. To adjust for proper burning, loosen the air shutter nut, rotate the air shutter to close the opening in the bu...

Burner Cleaning Step 1. Position gas control power switch to the “OFF” position and unplug heater from walloutlet. Step 2. Turn off gas supply to water heater. Step 3. Remove outer jacket door and inner door per service procedure XIII on page 35. Feedline nut P ilot tubin g nut I g niter/flame sense...

P DX S ER V I C E P R O C ED U RE II Pilot testing, Cleaning and Replacement Pilo t Inspec t ion , Tes t ing and Replacemen t Step 1. Position gas control power switch to the “OFF” position and unplug heater from walloutlet. Step 2. Turn off gas supply to water heater. Step 3. Remove outer jacket do...

`` P DX S ER V I C E P R O C ED U RE III Pressure Switch Testing and Replacement Pressure Swi t ch Tes t ing W A R NIN G 12 0 volt potential exposu r e. Use caution m a k in g volta g e chec k s to avoi d pe r sonal inju r y. Step 1. Position power switch on gas controlto the “OFF” position. Step 2....

E x haus t Pressure Swi t ch Replacemen t W A R NIN G 12 0 volt potential exposu r e. Use caution to avoi d pe r sonal inju r y. Step 6. Reconnect wires from step 5 to new pressure switch. Step 7. Reconnect tubing to new pressure switch. Step 8. Carefully position pressure switch into blower housing...

P DX S ER V I C E P R O C ED U RE I V Blower Testing and Replacement W A R NIN G 11 5 volt potential exposu r e. Use caution when m a k in g volta g e chec k s to avoi d pe r sonal inju r y. Blower Tes t ing Is there 11 5 VAC across terminals shown in photo 13 ? Incorrect supply volta g e polarity D...

P DX S ER V I C E P R O C ED U RE V Blower Temperature Switch Testing and Replacement Blower Tempera t ure Swi t ch Tes t ing . W A R NIN G 12 0 volt potential exposu r e. Use caution to avoi d pe r sonal inju r y. 1 5 Disconnect wire leads to switch. Usin g a multi-meter set to the ohms settin g , ...

PDX S ERV I CE PR O CED U RE V Blower Temperature Switch Testing and Replacement Blower Tempera t ure Swi t ch Replacemen t. W AR NIN G 12 0 volt potential exposu r e. Use caution to avoi d pe r sonal inju r y. Step 1. Position gas control power switch to the “OFF” position and unplug heater from wa...

° F 0 1 2 3 4 5 6 7 8 9 40 26109 25400 24712 24045 23399 22771 22163 21573 21000 20445 50 19906 19383 18876 18383 17905 17440 16990 16553 16128 15715 60 15314 14925 14548 14180 13823 13477 13140 12812 12494 12185 70 11884 11592 11308 11032 10763 10502 10248 1000 9760 9526 80 9299 9078 8862 8653 8449...

PDX S ERV I CE PR O CED U RE V I Gas Control & Thermal Well Testing and Replacement Gas C o n t r o l & Thermal Well Rem o val F r o m Wa t er Hea t er Step 1. Position gas valve power switch to the “OFF”position and Unplug Heater from power supply. Step 2. Drain heater to a point below the ...

PDX S ERV I CE PR O CED U RE V II Flammable Vapors Sensor Testing P a g e 2 8 PDX Series F l a mm a b l e V a por S e nsor Step 1. Position power switch on gas control to the “OFF” position. Step 2. Disconnect flammable vapor sensor from gas control. Step 3. Using a multi-meter set to the ohms setti...

PDX SERV I CE PROCEDURE V III Safety Circuit Voltage Trace S a f e t y C i r c ui t V ol t a g e Tra c e W AR NIN G 12 0 volt potential exposu r e. Use caution m a k in g volta g e chec k s to avoi d pe r sonal inju r y. P osition g as control switch to the “ON” position and adjust thermostat dial t...

PDX SERV I CE PROCEDURE I X 120 V A C Trace W AR NIN G 12 0 volt potential exposu r e. Use caution m a k in g volta g e chec k s to avoi d pe r sonal inju r y. Disconnect cord set as shown in photo 2 6 LED status None, Control LED not on or flashin g . Step 1. Verify 120V A C and proper polarity at ...

PDX SERV I CE PROCEDURE X Dip Tube Inspection and replacement Step 1. Position on/off switch of gas control valve to “OFF” position and unplug water heater from wall outlet. Step 2. Turn off cold water supply to water heater. Connect hose to drain valve of water heater and route to anopen drain. Ope...

PDX SERV I CE PROCEDURE X I A node Inspection and replacement Step 1. Position on/off switch of gas control valve to the “OFF” position and unplug water heater from walloutlet. Step 2. Turn off cold water supply to water heater. Connect hose to drain valve of water heater and route to anopen drain. ...

PDX SERV I CE PROCEDURE X II Flue Baffle Inspection and replacement Step 1. Position gas control power switch to the “OFF” position and unplug blower from wall outlet. Step 2. Disconnect vent system from exhaust adapter on top of blower. Step 3. Disconnect intake air piping. Step 4. Unplug cord sets...

PDX Series S t ep 4 . R i gh t s i d e Inn e r D oor Rem o val . a) Remove wire tie from feedline. b) Remove (2) 1/4" hex drive screws from right side inner door.c) Remove (2) 1/4" hex drive screws from flange section of inner door.d) Remove right side inner door and set aside. Be careful no...

PDX Series Installation of Inner Door With Gasket. W AR NIN G St r ippe d fastene r connections m ay allow fo r seal br each of inne r d oo r . A seal br each m ay r esult in a fi r e o r explosion causin g p r ope r ty d a m a g e , pe r sonal inju r y o r d eath. D o not ove r ti g hten sc r ews i...

PDX Series Step 10. Firmly place right side inner door flange against the left side inner door flange and secure with two ¼” drivescrews from step 3c. DO NOT OVER T I GHTEN SCREWS . Step 11. Align right side inner door to combustion chamber and verify the fastener holes of the combustion chamber are...

PDX Series F ro z en intake or exhaust vent terminal If an intake or exhaust vent terminal is blocked with ice or snow due to severe conditions, the pressure switch and control will not allow the burner to operate. This will result in a three flash error code. Once the blockage is removed (through m...