Boiler Identifier Brochure
Contents
1. To bleed the fuel unit on a single pipe system remove the plug located in the side of the regulating valve chamber With the fuel unit in operation allow enough oil to drain out to purge the entire system of air Catch the overflow in a suitable container This same tapping is for use of the pressure gauge when setting the DYWATHERM tor its proper C02 b Sub Gravity installations These must have a return line from the fuel unit to the oil storage tank In all other respects the starting instructions are the same as for gravity feed installations 12 Close main switch and start the burner Commercial Standard Cs75 76 The final adjustment should be made in compliance with the Commercial Standard CS75 76 which is as follows Certificate Following installation of the boiler certain test data should be obtained and recorded by the installer on the boiler certificate to be placed with each boiler installation The test data shall cover the following points C02 in flue gas by analysis draft stack temperature firing rate and smoke Requirements The standard requirements as approved by the industry are as follows 1 C02 in flue gas by analysis should not be less than 10 for efficient operation 3 2 Draft the draft shall be in accordance with specifications in this installation manual An automatic draft regulator or its equivalent is not required with DYWATHERM because of the positive draft feature Adjustments Combustion Efficie2. Go to next step b With a Call for Heat 1 No power at terminals 1 amp 2 Open wire in line or low voltage controller or Controller defective or system out on Hi Limit or System aquastat relay or switching relay defective 2 Power at terminals 1 amp 2 and load 2 Cad cell holding in sensitive relay relay will not pull in Go to step D for Cad Cell checkout or Proctectorelay is defective 3 Power at terminals amp 2 and load 3 Go to next step relay pulled in Service Procedure Indicates c Proctectorelay Pulled In 1 No power at terminals 2 amp 3 1 Defective Proctectorelay 2 Power at terminals 2 amp 3 but 2 Open wire to oil burner motor motor won t run or Defective oil burner motor d Cad Cell Check Out for Low Voltage With temperature satisfied remove one wire from S terminal Touch wire to S terminal intermittently making and breaking the circuit the small movement of the Sensitive Relay may be seen through its clear plastic dust cover 1 Sensitive Relay pulls in and out 1 Short in Cad Cell wires or Stray light getting to cell or Defective cad cell refer to Step E Cad Cell Test 2 Sensitive Relay does not pull in and 2 Return to step 2B burner still will not start Service Procedure Indicates e Cad Cell Test With temperature satisfied remove Cad Cell wires from S terminals and start burner When
3. are to be replaced Start Up Before starting burner 1 Check electrical connections 2 Check oil connections to tank and pump 3 See that the electrodes are properly positioned The electrodes should be 3 8 below the center of the nozzle tip and 1 16 forward of the face of the nozzle tip The gap should be 3 16 wide See that the electrodes are spaced 1 4 from any grounded metal The face of the nozzle should be 1 4 behind the orifice plate in the combustion head as shown on drawing in back pages of this manual Please refer to the drawings for 251SR Orifice Plate Assembly and Nozzle and Electrode Setting for DYWATHERM Combustion Head Models manufactured after December 15 1977 see burner manual provided 4 Oil motor The motors have sleeve bearings and are wick oiled Fill the reservoir with high grade spindle oil that will flow at low temperatures 5 See that the proper fuel oil is in the tank The DYWATHERM has been approved to burn Commercial Standard 2 Fuel Oil Heavier fuel is not recommended 6 Be sure the combustion control is in the starting position 7 See that all joints of smoke pipe are sealed tightly and sealed to the chimney 8 See that the system is fully supplied with water as required 9 Set room thermostat at a point slightly higher than room temperature 10 See that the boiler control is in the ON position 11 Open valve in fuel oil line a Gravity Feed Installation
4. cleaning of the strainer which is readily accessible in your fuel pump Instead of attempting to clean a nozzle tip we suggest that it be replaced To change the nozzle tip disconnect the ignition wires open the union and remove the back plate If however you attempt to clean the nozzle tip proceed as follows Remove the nozzle tip and with great care disassemble the parts and use clean paper for removing dirt or foreign matter Be sure that light can be reflected from all bright surfaces Do not under any circumstances insert anything into the nozzle hole harder than a soft wood toothpick Anything harder will destroy its walls and ruin its atomization Clean the nozzle strainer Since the slightest speck of dirt within the nozzle will affect the flame the cleaning must be thorough Wash all parts in kerosene and reassemble Nozzles Nozzles are very important components of DYWATHERM Models RB FP CC and FPA with original DYWATHERM cast iron burners Only nozzles with a 300 H angle of spray should ever be used Within a certain range delivery rate is not too important since the requirement of obtaining the correct CO2 and smoke readings will determine the gph of the nozzle For example the Model 36 DYWATHERM is designed to operate at 1 4 gph and the standard tip furnished is a 1 35 gph This shows that it may be necessary to increase pressures on the fuel unit to obtain the high CO2 required by DYWATHERM Because of fuel oil variations c
5. flame has been established jumper S terminals to maintain flame during Cad Cell Test ONLY Attach Cad Cell leads to suitable Ohmmeter 1 400 900 Ohms 1 Cad Cell normal 2 900 1500 Ohms 2 Cad cell marginal check alignment 3 Above 1500 Ohms 3 Replace cad cell With burner off dark cell Ohm reading should be from 20 000 to 1 000 000 Ohms If Onmmeter indicates a shorted condition remove cad cell from its socket If the short disappears 1 Replace cad cell mount In the event an Ohmmeter is not available Replace the Proctectorelay it is possible to check the Sensitive Relay by availing oneself of a 1500 Ohm resistor f With a Call for Heat 1 Flame is established but Sensitive 1 Open wire in Cad Cell circuit Relay does not pull in or Cad Cell not seated firmly in Its socket or Dirty fire caused by improper C02 and smoke setting or Cad Cell view obstructed or Refer to Step E Cad Cell Test Service Procedure To determine pull in refer to Step D procedure 1 If motor starts and safety shut down continues the oil system should be rechecked for leaks or air traps Check the fuel unit If it is air bound remove pipe plug allow air to escape and then replace pipe plug when oil flows If the boiler water is hot enough and domestic hot water is still not satisfactory the system could have some oil film that may have insulated the fins on the
6. hot water coil The coil has to be removed to make this determination In cases where the domestic hot water has a high hardness level the hot water coil could be insulated on the inside by a build up of a hard white coating This is a gradual process and it would not show up as a problem for several years This can be corrected by flushing acid through the coil to remove the build up Please consult your service man Cleaning Please refer to Drawing 1001 2 in the back of this manual 1 Remove four 4 brass nuts holding end head Piece 10 2 Lower end head Piece 10 on hinge to horizontal position Be careful not to drop scroll Piece 42 if scroll is used Remove scroll Piece 42 3 Clean small tubes Pieces 3 with vacuum cleaner If carbon has caked It may be necessary to use a tube brush 4 If there is any carbon in 8 combustion tube Piece 4 clean out 10 11 12 13 Examine liners Pieces 5 6 7 amp 8 If they are in good condition do not move them Note All liners and baffles will develop cracks due to expansion and contraction Unless they have been broken down it is not necessary to change them If they are to be replaced be absolutely sure they are in proper alignment and pushed forward into flue connection casting Piece 35 to protect casting Check condition of end head insert Piece 11 clean glass Piece 13 Check gasket Piece 47 It is always best to replace gaskets Re
7. MODEL IDENTIFICATION All DYWATHERM Boiler models are identified by a Serial Number ex 3421 usually with an alphabetical prefix ex FP3421 The following list defines the serial number notation for each model produced since 1945 for which parts are still available Series 1945 1 Original two pass DYWATHERM discontinued in 1947 serial number with no prefix Example 3421 Series 1945 2 First three pass DYWATHERM belly type 1947 to 1948 serial number prefixed with 0 Example 03421 3 Series 10 DYWATHERM 1948 to 1949 serial number prefixed with 10 Example 103421 Call ACV DYWATHERM tor parts for Series 10 boilers RB 4 Revised belly type 1950 to 1964 serial number prefixed with RB Example RB3421 FP 5 FP Model 1965 to 1974 serial number prefixed with FP Example FP3421 CC 6 CC Model 1974 to 1976 serial number prefixed with CC Example CC3421 FPA 7 FPA Model 1976 to 1977 manufactured by ACV DYWATHERM serial number prefixed with FPA Example FPA3421 FPB 8 FPB Model 1977 to 1988 manufactured by ACV DYWATHERM serial number prefixed with FPB First model using conventional retention head burners Example FPB3421 FPG 9 DQYNATHERM FPC 1988 to 1990 manufactured by O Brien Products serial number without prefix Example 3421 FPC 10 DYNATHERMFPC 1991 to 1996 manufactured by O Brien Products serial number prefixed with C Example C3421 FPC 11 DYNATHERM FPC manufactured by DYWA
8. R SERVICE DYWATHERM is a simple uncomplicated heating unit ready to be a valuable servant When requesting information for service or parts please provide the model number if available Boiler serial numbers stamped on the tube sheet directly above the coil opening on older models or above the burner on newer models will aid us in expediting your requests Smoke Test C02 tests alone will not guarantee satisfactory and dependable operation DYWATHERM as well as any other oil fired heating unit must be set for a suitable smoke reading in conjunction with a good C02 It is quite obvious that a high C02 with a heavy smoke reading will produce not only inefficient operation but also irritating and expensive service calls At this point it would be well to stress the fact that DYWATHERM unlike the average conversion burner will actually produce more smoke below 10 C02 than it will above 10 C02 with the ideal range normally being about 11 1 2 C02 For this reason we insist that DYWATHERMs be set for 10 12 C02 at the point of least smoke and never above 2 on the Baccarat scale A sheet of smoke tests ranging from a 9 CO2 setting to an 11 C02 setting graphically exhibits this point Controls Carefully check the operation of all controls and make sure that they function properly 12
9. THERM Boiler Mfg 1996 to Present serial number prefixed with C Example C3421 Remember DYWATHERM operation is controlled in the combustion head and combustion chamber The following points should be checked Orifice plate condition and relation to nozzle and electrodes Liner and baffle arrangement in combustion chamber Gaskets should be changed if hard or broken DYWATHERM requires tight gaskets If above are checked C02 is set from 10 13 at the point of least smoke never above 2 or 3 boiler and chimney clean DYWATHERM will operate with no problems Oona Any boiler in operation over 10 years should be updated as noted herein or in any other area particularly controls Contact us for advice DYNATHERM INSTALLATIONS WITH ORIGINAL CAST IRON BURNER Introduction DQYNATHERM is the finest oil fired home heating unit for hot water on the market today It employs principles of combustion proven through more than 100 years of field experience many of which are now being acclaimed as new developments Practical field experience as well as design engineering has contributed to DYWATHERMs development Throughout the years DYWATHERM has maintained its practice of keeping pace with progress in the domestic heating field The list of DYWWATHERM firsts is a long one and other manufacturers of heating equipment are only now using many of the features that have been standard equipment on DYWATHERM ior many years While almost all of t
10. d if leaks occur you will have smell and carbon around boiler Replace stack making sure joints are tight All joints in stack should be secured with screws and tape wrapped around each joint Replace nozzle assembly making sure nozzle assembly gasket Piece 24 is in good condition and in place Fire boiler and check C02 for proper setting 10 to 13 Check smoke reading Must be less than 2 Check all gaskets and joints while burner is running making sure that there are no leaks Clean up around boiler and boiler room Normal cleaning does not require removal of flue connection Piece 41 If however there is reason to remove flue connection proceed as follows Remove combustion head Piece 16 held to flue connection by three 3 8 x 1 cap screws It is always good to put shims under fan housing to hold at proper level This will make it easy to reassemble Push combustion chamber refractory to rear of boiler to clean flue connection Remove four brass nuts holding flue connection to boiler When putting flue connection back on boiler make sure all gaskets are in place and tight Return combustion chamber to proper place making sure first liner enters flue connection Servicing Older Dynatherm Units For various reasons DYWATHERM oil fired heating units have been changed in design throughout the years However the changes made in no way effected the efficiency or the basic concept of DYWATHERM combustion All DYWATHERM un
11. essibility and change if necessary 7 Close end head being careful not to displace scroll 8 Pull up bolts evenly into snug position 9 Start unit and check for leaks Do not seal any gasket leaks with boiler cement 10 Take CO2 reading a If between 10 12 take a smoke reading b Unit should be set at the C02 reading where smoke is 2 or less on Baccarat Chart Normally this will occur at about 11 1 2 C02 c To increase C02 increase oil pressure The air supply is fixed on DYWATHERM Nhile this eliminates the necessity of air adjustment the correct amount of oil introduced into the unit is necessary to obtain proper C02 If oil pressure exceeds 150 Ibs and C02 is not above 10 replace nozzle with another of the same size or next larger size d To decrease C02 reduce oil pressure If oil pressure drops below 90 Ibs without obtaining proper C02 replace nozzle tip with another of the same size or next size smaller Consult burner manual for proper angle on boiler built after this date e DOYNATHERMS normally produce proper C02 and smoke reading between 120 and 150 Ibs oil pressure These are the only adjustments necessary to set DYWATHERMs for proper combustion Please take time to do it properly It will guarantee customer satisfaction and save you as well as the customer time and money 11 Take stack temperature reading 12 With the C02 smoke test and stack temperature the operating efficiency can be deter
12. he changes are adaptable to all DYWATHERMs our standardization program began in 1978 with the introduction of the Carlin Retention head burner Therefore these instructions will deal mainly with the OQYNATHERMs manufactured since that year It bears repeating that DYWATHERMs manufactured prior to our standardization program can be brought up to date Thousands of DYWATHERMS some installed as early as 1936 are performing at peak efficiency today because the people servicing them have kept abreast of changes and have applied these changes to the equipment DQYNATHERM is without a doubt the easiest oil fired unit to set up for firing at peak efficiency if all instructions are followed First it must be remembered that DYWATHERM is a positive pressure unit It is this feature that makes possible DYWATHERMs sometimes unbelievable fuel economies This positive pressure makes it imperative that all gasket seals on ODYWATHERM be absolutely tight Therefore these seals should be checked whenever any gasket is disturbed This is particularly true of the 1 2 cored rope gasket used to seal the end head or cleanout door This gasket is required to be replaced every time the end head is opened for annual maintenance and cleaning The other gaskets are not usually in need of annual replacement However after years of use they should be candled occasionally to make sure they are sealed Much grief can be eliminated if gaskets are replaced when there is n
13. himney pull and other factors this may not always be true Therefore it is sometimes necessary to go to a higher gph 1 5 or 1 65 to reach the CO2 requirements Very seldom is it necessary to go to a lower gph although it is conceivable The FPB models require a different angle Please consult burner section for this information Nozzle settings are important because DYWATHERM fires through a 1 1 4 opening in an orifice plate The nozzle should be centered in this opening 1 4 behind the back of this plate to prevent possibility of grounding the electrode to the plate Grounding would occur if the electrode did not clear by 1 4 This orifice is tapered to relieve this situation If the nozzle is set more than 1 4 behind the plate it is possible to cause oil impingement on the plate with resultant malfunctioning Nozzles Prior To 12 15 77 It is very important that the proper nozzle size and spray angle be used with the DYWATHERM The following sizes and spray angles must be used NOTE ALL NOZZLES ARE HOLLOW HAGO NOZZLES ARE RECOMMENDED 24 1 10 30 or 1 25 30 100 3 00 30 or 3 25 30 36 1 35 30 or 1 50 30 125 4 00 30 or 4 25 30 48 1 65 30 or 2 00 30 150 5 00 30 or 6 25 30 48 32 2 24 30 or 2 50 30 200 5 50 30 or 6 00 30 If other than 30 degree nozzles are used the result will be carbon deposits in the nozzle chamber which will cause unsatisfactory operation and safety shutdown 1 T
14. its if brought up to date as recommended would be just as efficient and dependable as those now being produced 10 ALL DYNATHERM INSTALLATIONS Scroll And Cleanout Cover Models 18 24 36 42 and 48 use a cast iron scroll held in position by the end head refractory insert In some units a soft refractory has been substituted for the recommended hard refractory insert which will not support the scroll Wherever this is the case it is strongly recommended that both a scroll and a hard refractory be installed in place of a soft refractory insert One s stack temperature can be reduced by as much as 100 150 degrees In any event when installing the scroll it must be properly placed over the tubes or it will not be possible to attain a tight seal The bevel edge on the inside diameter of the scroll allows for clearance fit over the 13 combustion tubes Chimney Chimney troubles often result in the heating unit being blamed unjustly for many complaints Cracked tile and unlined chimneys lead to leakage of the products of combustion which when combined with water vapors mar the external sides of the chimney Care should be taken to be certain that chimneys are clean of flyash or carbon DYWATHERM with its low stack temperature will cause any deposits of these materials to fall down and block the escape of the products of combustion This of course will cause a malfunction of the unit and result in dirty operation requiring a comp
15. kwise Be sure to replace cover and gasket when adjustment is completed When 10 12 C02 is obtained the oil pressure should be in the range of 90 Ibs to 150 Ibs If it is necessary to exceed 150 psi to obtain C02 of 10 12 the next larger size tips should be installed and pressure adjusted to obtain correct C02 The foregoing could occur when nozzle tips would deliver to burn a fixed amount of oil with fixed air It is occasionally necessary to follow this procedure USE A PRESSURE GAUGE WHEN INCREASING OR DECREASING OIL PRESSURE C02 Test Procedure The following is a step by step procedure to set up and test a DYWATHERM ANY ATTEMPT TO FIRE AN ORIGINAL BYWATHERM INSTALLATION AFTER SERVICING WITHOUT THE USE OF A C02 KIT IS FUTILE AND CAN LEAD TO SERIOUS COMPLICATIONS ALL WARRANTIES GUARANTEES AND RESPONSIBILITIES WRITTEN OR IMPLIED BY DYWATHERM OR ANY OF ITS EMPLOYEES ARE VOID UNLESS SUCH TESTS HAVE BEEN TAKEN AND RECORDED FOR THE OWNER 1 Be sure proper nozzle is installed Note See recommended nozzle list for boilers built after December 15 1977 2 Open end head or cleanout door 3 Check for proper arrangement of liners and baffles on Models before 12 15 77 4 Allliners and baffles must be pushed tightly toward burner end 5 Ifa scroll is used position so as to clear all tubes and lay flat against the tube sheet NOTE DYWATHERM Models 48 32 100 125 150 amp 200 are not designed for use with a scroll 6 Check gasket for compr
16. lete cleaning of the unit Fireplaces on the same flue section as the heating unit are sources of noise and vibration and if possible should be segregated Many chimneys are placed with three side exposure to the outside DYWATHERM with its low stack temperature occasionally causes the water vapors to condense If the chimney is in bad condition unlined or unprotected from precipitation this condensation will flow down the inside and in some cases down the outside of the chimney This can be eliminated with the installation of an H stack cap or other stack capping devices similar to the Wigwam cap In extreme cases an opening to the chimney from the basement will tend to dry out chimneys When this is applied on a DYWATHERM installation care should be taken to install a barometric damper in the chimney proper and below the entrance of the DQYNATHERM exhaust vent Troubleshooting While a low draft reading will not bother the operation of DYWATHERM downdraft will cause erratic operation Large trees near the chimney or failure to extend the chimney beyond the peak of the roof often causes downdraft and must be corrected Careful examination of chimneys for the above named defects will relieve the heating plant of being blamed for many customer complaints Component Parts This general service discussion does not delve into problems of motors transformers fuel units circulators fuel tanks etc because their relatively small service p
17. mined DYWATHERMs should never operate at less than 80 efficiency Instructions For Assembling Jacket Models 24 36 48 48 32 Fp Cc Fpa Fpb 1965 1978 DQYNATHERM boilers are shipped with the jacket in a separate carton This is done to prevent damage to the jacket during shipment Identify jacket components using care not to mar the finish Piece 1 Left side panel Lowers to the burner end of boiler Piece 2 Right side panel Lowers to the burner end of boiler Piece 3 Top rear Longest of the top section pieces Covers the boiler end opposite the burner Piece 4 Top front Short top section These two sections join together prior to mounting on boiler Piece 5 Rear door panel attaches sides together Piece 6 Rear door mounts over end head Piece 7 One bag with sheet metal screws For final assembly attach item 4 to item 3 using screw holes provided Place on top of boiler Arrange items 1 and 2 on respective sides making sure bottom is secure over mounting skid Then install one screw on each side Finally mount item 5 and 6 on each end making sure bottom retainer slips over skid Servicing The owner looks to you for continuous satisfactory operation While a large percentage of service calls result from conditions not traceable to the DYWATHERM when the unit is at fault the procedure given under installation and adjustment should be observed In addition your inspection should include examination and
18. move cleanout cover Piece 52 at burner end Insert vacuum hose into bottom chamber and clean thoroughly If combustion control is an old style relay R1 17 R817 etc It would be mounted on cleanout cover Piece 47 The relay should be cleaned around the helix Take down stacks clean and check chimney Remove nozzle assembly clean and check electrodes Piece 29 Check nozzle assembly gasket Piece 24 replace if torn check nozzle tip Piece 19 Nozzles should not be replaced unless they are not working as they should If you get proper C02 and smoke reading nozzle tip is okay Check orifice Piece 17 If plate has small cracks this is due to expansion and contraction Plate is okay If plate has large cracks and is warped replace plate by removing combustion head Piece 16 Check oil filter in oil line Replace insert with new one Check rope gaskets Piece 45 on flue connection Piece 35 Replace if leaking m OO 15 16 17 18 19 20 21 22 Place scroll Piece 42 if used over and around 2 boiler tube Piece 3 Raise end head Piece 10 into place and install 4 brass nuts Tighten nuts making sure that rope gasket Piece 47 is tight If rope gasket is not tight check if scroll Piece 42 has not slipped off 2 boiler tubes Replace cleanout cover Piece 52 making sure to seal with a new gasket It is very important that all seals be tight as boiler is under pressure an
19. ncy Oil Pressure Etc The DYWATHERM by virtue of its construction is distinctive in its operation Positive pressure is generated throughout the combustion zone thus eliminating the necessity for ideal draft conditions the so called chimney pull that most conventional types of burners depend upon It is designed to operate at its maximum efficiency when producing its rated output with 10 to 12 C02 and a smoke reading of 2 or less on the Baccarat scale in the combustion gas and any other setting will result in increased stack temperature and lowered efficiency For this reason it is not possible to adjust the burner by observing the color or character of the flame THE FLUE GASES MUST BE ANALYZED AND C02 CONTENT CHECKED TO DO THIS PROCEED AS FOLLOWS Allow the burner to operate for about 10 minutes then remove the pipe plug from the cleanout plate at lower left front head of boiler or at elbow on Models 100 and 200 Insert the sampling tube of an Orsat and pump a representative sample of flue gas into the Orsat Test for C02 content If analysis shows less than 10 C02 increase the oil pressure until the correct reading is obtained Increasing the oil pressure increases the C02 content decreasing the oil pressure decreases the C02 content Removing the cover over the adjusting screw and turning this screw can vary the oil pressure To increase oil pressure turn screw clockwise and to decrease oil pressure turn screw counter cloc
20. o longer sufficient compression available NEVER ATTEMPT TO SEAL DYWATHERM BY THE USE OF BOILER CEMENT OR SIMILAR COMPOUNDS Any leakage of gaskets will cause products of combustion to be forced into the boiler room If for any reason the burner end of the DYWATHERM is removed from the boiler it is very important to be sure that the gasket sealing the front head to the primary combustion tube is replaced and tightly sealed If it is not a bypassing of the combustion air will occur and will dilute the gases and make it impossible to raise a good CO2 The effect of this gasket leaking can be detected when the CO2 remains at a low reading with the proper nozzle installed and shows no increase with an acceleration of pump pressure Combustion Chamber Arrangement DQYNATHERMs clean operation depends on combustion taking place within a confined area This is accomplished and controlled by use of various combinations of liner and baffle arrangements The arrangements are shown for each model on the Liner and Baffle Arrangement drawing sheets Be sure that the liners and baffles are tightly pushed against each other and forward into the boiler against the burner end as shown on the drawings Please see schematics in the back of this manual Liners and baffles may crack after firing but this will not affect operation of the unit as it is required to allow for expansion and contraction Liners and baffles should not be moved after firing unit unless they
21. roblems are common to all 11 units and are normally rather simple to solve However at this point it is important to make one particular point on controls Never use any controls on DYWATHERM except those recommended in your Service Manual These controls have special features required for DYWATHERM Conventional controls on the market do not have these features The purpose of the foregoing is to explain those points that are common only to DYWATHERM We would like to emphasize that DYWA7THERM is not a complicated machine since we have reduced so many of the variables inherent in oil fired equipment to their utmost simplicity Many uninformed servicemen tend to over service DY WATHERMs and to create problems that do not exist For this reason we have published this general DYWATHERM service manual Thousands of DYNATHERMs installed and serviced as we recommend operate dependably and efficiently day in and day out without any serious service problems other than annual care Letters in our files attest to this statement Testing laboratories have been amazed at DYWATHERMS dependability and economy and have expressed this fact to us We work continually toward incorporating new ideas and advancements into DYWATHERM Remember that DYWATHERM is designed to work at high CO2 readings and will do so at low smoke readings Unlike the ordinary burner when CO2 readings are low on DYWATHERM the smoke readings will be high This is important DO NOT OVE
22. rouble Shooting Burner will not start If the motor does not start trip the safety switch button on the combustion control If this fails to produce the desired results follow the instructions in the control instruction pages which will be found in the back of this manual The Cad Cell Relay R8185E has two switching relays the Load Relay whose function is to switch on the burner motor and transformer for ignition when there is a call for heat and the smaller Sensitive Relay which is the plastic covered one energized by the Cad Cell whenever the cell sees light When this occurs the system is under normal operating condition If the Sensitive Relay is not energized on start the system will enter safety condition and shutdown in approximately 30 seconds Manual reset is required If Relay is de energized during operation the unit will shut down almost immediately and restart If flame is not sighted control will lock out in approximately 30 seconds as above Manual reset is required One important point to remember at this point is that if the Cad Cell would be sighting light prior to Load Relay being energized it will not allow the Load Relay to pull in A flickering low intensity flame or a loose socket will cause a chattering of the Sensitive Relay and eventual burnout Be sure this is not happening You can visually check this Service Procedure Indicates Check Power at Fuse Box 1 No Power 1 Blown fuse 2 With Power 2
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