Thermo Pride OH6FA072D48C Installation And Operation Manual Download Page 36

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Cooling Speed Set-ups

OH6F*072DV4

Furnace Motor Current

Draw (Amps / Watts) vs.

External Static Pressure (in W.C)

Air Flow

Static Pressure (Amps/Watts)

Fan
Control
SW 1
Switch
Settings

Clg. Tonage

Cool

Continuous

0.2

0.5

6-OFF
5-OFF
4-OFF

799

500

1.2/109

2.1/186

6-OFF
5-OFF
4-ON

2.5

1017

508

1.8/160

2.5/230

6-OFF
5-ON
4-OFF

1210

605

2.4/220

3.3/308

6-OFF
5-ON
4-ON

3.5

1404

702

3.2/305

4.2/409

Factory
SW1
Switch
Settings

6-ON
5-OFF
4-OFF

1622

799

4.6/443

5.7/560

NOTE: All information is approximate. Results will vary by installation.

Figure 18-3: Cooling blower motor speed chart

Summary of Contents for OH6FA072D48C

Page 1: ...URY OR LOSS OF LIFE DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE c WARNING IMPROPER INSTALLATION ADJUSTMENT ALTERATION SERVICE OR MAINTENANCE CAN CAUSE INJURY OR PROPERTY DAMAGE REFER TO THIS MANUAL FOR ASSISTANCE OR ADDITIONAL INFORMATION CONSULT A QUALIFIED INSTALLER OR SERVICE AGENCY PLEASE READ THESE INSTRUCTIONS PRIOR TO INS...

Page 2: ......

Page 3: ...MATION SECTION 48 A OIL SUPPLY 48 B COMBUSTION AIR SUPPLY 48 C INSPECTION AREAS 48 D STARTING THE BURNER 49 E FILTER CLEANING AND LOCATION 49 IV INSTALLER S INSTRUCTIONS TO USER 50 V DEALER MAINTENANCE 51 A GENERAL INSPECTION 51 B HEAT EXCHANGER 52 C HEAT EXCHANGER CLEANING INSTRUCTIONS 52 D ELECTRICAL SYSTEM 54 E SUPPLY RETURN AIR BLOWER 54 F SUPPLY RETURN AIR FILTER 54 G EXTENDED APPLIANCE SHUTD...

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Page 5: ...mbers O H 6 F A 0 7 2 D 4 8 B O H 6 F A 0 7 2 D V 4 R O H 8 F A 1 1 9 D 6 0 B O H 8 F A 1 1 9 D V 5 R O Oil O H Highboy D Downflow H 6 Heat Exchanger Size Identifier 6 F Front F R Rear R A Single Stage A X 2 Stage X Heating Capacity MBTUH 000 s with factory installed nozzle 0 7 2 D Direct Drive D Clg Airflow Example 48MBTUH 4 tons 400cfm ton 4 8 Clg Airflow Variable Speed ECM V5 5tons V 5 B Becket...

Page 6: ...IED SERVICE PERSON See Page 52 cCAUTION DO NOT ATTEMPT TO MAKE REPAIRS YOURSELF See Page 48 cWARNING The area around the furnace should be kept free and clear of combustible liquids and material especially papers and rags See Page 3 cWARNING NEVER burn garbage or refuse in your furnace Never try to ignite oil by tossing burning papers or other material into your furnace See Page 48 cWARNING Thermo...

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Page 8: ...omizing oil burner and combustion air blower used to push the products of combustion through the heat exchanger system After installation the furnace and duct system must be adjusted to obtain a temperature rise of 51 F to 81 F through the unit Refer to the rating label located on side panel inside the burner compartment The return air temperature must be above 55 F to prevent condensation of flue...

Page 9: ...on air is available to the unit 4 The airflow resistance of the duct system attached to this appliance must fall within the allowable external static pressure range for this unit Refer to the Airflow Requirements and Sizing of Ductwork section of this manual 5 Make sure supply and return air ducts are completely sealed to the appliance casing Refer to the Airflow Requirements and Sizing of Ductwor...

Page 10: ...ey to minimize any horizontal run of flue pipe which may be required 4 A furnace installed in a residential garage must be installed so the burner and ignition source are located higher than 18 inches above the floor The furnace must also be located or protected to avoid physical damage by vehicles cWARNING This furnace is not to be used as a construction heater 5 Listed below are definitions of C...

Page 11: ... cases corrosion of the heat exchanger Condensate also could enter the home through cracks or joints in the chimney in a worse case situation Condensation most likely will not occur at the bottom of the chimney because the stack gas heats the chimney walls as it rises and the bottom will be heated first This heating of the walls will cause the stack gas temperature to drop which in turn may reduce...

Page 12: ... feet above roof or exit point must be maintained See Figure 2b If the roof is flat rather than the normal residential pitched roof refer to Figure 3 for proper clearances Fig 3 Proper chimney termination height for flat roofs 3 PROPER VENT CONNECTOR PIPE CHIMNEY CONNECTION The vent connector pipe should extend only to and not beyond the inside wall of the chimney See Fig 4 A thimble should be use...

Page 13: ...will seal to avoid air leaks 7 NO INTERCONNECTED CHIMNEY FLUES If chimney flues are divided or there are multiple flues within one chimney make sure there are no openings in the partition separating the divided or individual flues 8 FLUE PIPE CLEARANCES SIZING AND TYPE The vent connector pipe must not pass through a combustible wall or partition unless adequate protection is provided at the passag...

Page 14: ...iber or mineral wool batts sandwiched between two sheets 0 024 24 gauge sheet metal with ventilated air space 9 6 5 3 3 3 A Equal the required clearance with no protection B Equals the reduced clearance permitted in accordance with the preceding clearance chart C The protection applied to the construction that covers the combustible material should extend far enough in each direction to make C equ...

Page 15: ...de wall vent kits for such applications When installing the sidewall vent kits outside combustion air must also be applied to the burner The following table identifies application order information Table 2 Sidewall vent kits The Field vent kit is set up with 4 inch diameter vent pipe for OH6 and 6 inch diameter vent pipe for the OH8 with concentric through the wall vent termination inlet air vent ...

Page 16: ...ed with a parallel flow arrangement dampers or other means used to control flow of air should be provided to prevent chilled air from entering the furnace If such a damper is manually operated it must be equipped with a means to prevent operation of either unit unless the damper is in the full heat or cool position The duct system should again follow the current design standard of Air Conditioning...

Page 17: ...ir velocities also result in larger duct sizes than necessary at higher velocities In some cases space restrictions may limit the ductwork to smaller than optimal sizes 6 The following method can be used to size ductwork when air velocities are low to moderate a Using a floor view of the residence determine or layout the locations of the supply registers and the return air grills Generally supply ...

Page 18: ...give the proper pressure drops Usually the cross sectional area of the ductwork should be changed in order to adjust the pressure drop to a suitable value Refer to Example 2 page 14 for a sample calculation of how to use this method for sizing the supply side ductwork for a residence Table 3 shows the air handling capacities of 100 ft lengths of circular and rectangular ductwork based on a 0 1 in ...

Page 19: ...or heat gain to the ducts 8 As a final step in the installation the appliance must be adjusted to deliver a temperature rise within the range of 51 to 81 F Adjust the blower motor speed to obtain a temperature rise within the acceptable range The required blower speed will depend on the airflow resistance of a supply and return air duct systems Fig 9 Supply air duct sizing Example The RETURN AIR D...

Page 20: ...ck provided with the furnace refer to Fig 10a 10b will serve as a template to scribe a mark for the return air opening on the casing Place the filter rack on a side casing approximately one inch up from the bottom of the furnace and centered from side to side Place the securing flange against the casing when locating the return air opening For your convenience 4 locator knockouts have been placed ...

Page 21: ... OH6 furnace Fig 10b A typical filter rack and dimensions for the OH8 furnace Failure to comply with minimum filter installation requirements may affect the performance and or void the warranty on this unit If a method other than Thermo Pride filter racks is selected for retention of the filter and or use of a different filter type is desired refer to Table 4 below for minimum sizing guidelines fo...

Page 22: ...be removed although they can be cut to size as needed F LIMIT POSITION AND LOCATION cWARNING The predetermined limit locations on all of the Thermo Pride oil fired furnaces have been tested and approved by Thermo Products LLC Any attempt to relocate these safety controls or replace these safety controls with a control that is not approved or is incompatible may result in personal injury substantia...

Page 23: ...n 1 4 inch back from the inside surface of the combustion chamber A distance further than 1 4 inch back from the inside chamber wall may cause impingement and sooting This unit is equipped with a chamber retainer refer to Fig 12 The retainer secures the chamber during shipping and helps to maintain insertion depth DO NOT remove this retainer when installing burner Fig 12 Typical location of the ov...

Page 24: ... TP2502 N AFG 4 5 F6 2 3 4U 1 10X80 H 1 00X80 H 120 Optional Carlin oil burner application FURNACE MODEL THERMO PRIDE S BURNER SPEC NO INS CARLIN BURNER MODEL TUBE LENGTH HEAD STATIC PLATE MAXIMUM NOZZLE SIZE SHIPPED NOZZLE SIZE OIL PUMP PRESSURE PSIG OH6FA072D C 99032B N EZ 1HP 4 5 N A N A 0 75X60 H 0 60X60 H 120 OH8FA119D C 99032C N EZ 1HP 4 5 N A N A 0 90X60 H 0 85X60 H 140 Optional Riello oil ...

Page 25: ...L FLOWRATE IN GPH FOLLOWED BY THE SPRAY ANGLE IN DEGREE S AND THE SPRAY PATTERN EITHER H FOR HOLLOW CONE OR S FOR SOLID CONE FOR EXAMPLE A NOZZLE RATED AT 0 65 GPH 100 PSIG THAT PROVIDES AN 80 SPRAY ANGLE AND A HOLLOW SPRAY PATTERN WOULD BE ABBREVIATED IN THE TABLE AS 0 65 X 80 H NOTE The reason the Riello burner nozzle sizes are smaller than the standard Thermo Pride burner nozzles is that pre se...

Page 26: ...psi 90 000 LOW FIRE 85 000 130psi 74 000 LOW CAPACITY HIGH FIRE 50 X 45 W 85 000 170psi 74 000 LOW FIRE 70 000 130psi 60 000 Table 9 Riello 2 stage firing rates Based on 2 domestic heating fuel oil having heating value of 140 000 BTU per gallon Based on thermal efficiency of 84 85 MOUNTING THE 2 STAGE RIELLO BURNER It is necessary that the insulation gasket be placed between the mounting plate and...

Page 27: ...sing a gasket resistant to the corrosive action of fuel oils 7 Pipe dope or thread sealant design certified to be resistant to the action of fuel oils should be used on all threaded joints Thread sealant should only be applied to the male member of a joint The first two threads on the end of the male member of each pipe joint should be clean and free from thread sealant 8 Connection of the oil sup...

Page 28: ...to trap a 40 50 micron particle The filter cartridge should be replaced at least once a year The filter body should be thoroughly cleaned before installing a new cartridge K ELECTRICAL WIRIING This appliance must be grounded in accordance with local codes or in the absence of local codes with the National Electrical Code ANSI NFPA 70 1999 or the latest edition All wiring must conform to the provis...

Page 29: ...f push on or screw on type terminals to ensure that all wires and wire connectors are firmly secured A loose terminal can cause poor flow of electrical power to motors This may result in very high current draws by these components If great enough high current draw will cause blown fuses burned wires and contactor points and pre mature motor failure Each electrical connection has been factory check...

Page 30: ...ating and or cooling cycle Calibration will help to produce a more constant indoor temperature by adjusting the length of the heating cooling cycle to fit the application A vital consideration of this calibration is related to the thermostat heat anticipator The proper thermostat heat anticipator setting is 0 1 ampere To increase the length of the cycle increase the setting of the heat scale to de...

Page 31: ...e the needle on to the measurement scale of the instrument proceed as follows 1 Wrap 10 loops of single strand insulated thermostat wire around the prongs of an ammeter refer to Figure 17 Set the scale to the 1 to 5 or 1 to 6 amp scale Figure 17 Analog Ammeter w Wire Loops to Boost Reading 2 Connect the bare ends of this wire jumper across terminals R and W on the sub base RH and W on an isolating...

Page 32: ...ating mode for proper operation If a digital ammeter is used read the current draw directly from meter Steps 1 through 3 are not required The meter reading is the correct anticipator setting L Blower Motor Speed Selection Turn off the electrical power to the unit before attempting to change supply air blower speed wiring The furnace comes from the factory with the proper cooling speed selected and...

Page 33: ... Rise F0 0 2 0 5 3 OFF 2 OFF 1 OFF 740 75o 1 1 98 1 8 173 3 OFF 2 OFF 1 ON 812 68o 82o 1 3 114 2 1 193 3 OFF 2 ON 1 OFF 883 63o 76o 1 5 129 2 4 218 Factory SW1 Switch Settings 3 OFF 2 ON 1 ON 968 57o 69o 86o 1 7 148 2 4 223 3 ON 2 OFF 1 OFF 1054 63o 79o 1 9 173 2 7 246 3 ON 2 OFF 1 ON 1153 58o 72o 2 3 207 3 0 283 3 ON 2 ON 1 OFF 1267 66o 2 7 247 3 5 332 3 ON 2 ON 1 ON 1424 58o 3 4 315 4 3 409 Reco...

Page 34: ...x Rise F0 02 05 3 OFF 2 OFF 1 OFF 1202 78o 1 6 146 2 5 233 3 OFF 2 OFF 1 ON 1315 71o 84o 1 9 174 2 7 252 3 OFF 2 ON 1 OFF 1429 65o 77o 2 3 206 3 2 294 3 OFF 2 ON 1 ON 1565 60o 70o 78o 2 6 242 3 6 337 Factory SW1 Switch Settings 3 ON 2 OFF 1 OFF 1701 55o 65o 72o 3 1 292 4 1 399 3 ON 2 OFF 1 ON 1860 59o 66o 3 7 354 4 8 466 3 ON 2 ON 1 OFF 2041 60o 4 7 452 5 7 567 3 ON 2 ON 1 ON 2223 55o 5 9 587 7 2 ...

Page 35: ...4º 740 90º 592 113º 740 113º 3 OFF 2 OFF 1 ON 812 650 85º 812 82º 650 103º 812 103º 3 OFF 2 ON 1 OFF 883 706 79º 883 75º 706 94º 883 94º 3 OFF 2 ON 1 ON 968 744 72º 968 69º 774 86º 968 86º 3 ON 2 OFF 1 OFF 1054 843 66º 1054 63º 843 79º 1054 79º 3 ON 2 OFF 1 ON 1153 922 60º 1153 58º 922 72º 1153 72º FACTORY SW1 SWITCH SETTINGS 3 ON 2 ON 1 OFF 1267 1013 55º 1267 53º 1013 66º 1267 66º 3 ON 2 ON 1 ON ...

Page 36: ... Cool Continuous 0 2 0 5 6 OFF 5 OFF 4 OFF 2 799 500 1 2 109 2 1 186 6 OFF 5 OFF 4 ON 2 5 1017 508 1 8 160 2 5 230 6 OFF 5 ON 4 OFF 3 1210 605 2 4 220 3 3 308 6 OFF 5 ON 4 ON 3 5 1404 702 3 2 305 4 2 409 Factory SW1 Switch Settings 6 ON 5 OFF 4 OFF 4 1622 799 4 6 443 5 7 560 NOTE All information is approximate Results will vary by installation Figure 18 3 Cooling blower motor speed chart ...

Page 37: ...18 509 703 1 4 121 2 1 192 6 OFF 5 ON 4 OFF 3 1212 606 848 1 8 159 2 6 231 6 OFF 5 ON 4 ON 3 5 1406 703 994 2 3 203 3 1 290 Factory SW1 Switch Settings 6 ON 5 OFF 4 OFF 4 1624 800 1139 3 0 278 4 0 378 6 ON 5 OFF 4 ON 4 5 1818 897 1285 3 8 353 5 0 475 6 ON 5 ON 4 OFF 5 2012 994 1406 4 8 456 6 0 582 6 ON 5 ON 4 ON 5 5 2230 1115 1551 6 1 593 7 4 729 NOTE All information is approximate Results will va...

Page 38: ...1802 1762 1705 1635 1569 1493 1428 Furnace Motor Current Draw Amps vs External Static pressure in WC Low 3 3 3 1 3 0 2 9 2 6 2 5 2 4 ML 4 2 4 0 3 9 3 7 3 6 3 3 3 0 MH 5 4 5 2 5 0 4 7 4 4 4 2 4 0 High 6 6 6 4 6 0 5 7 5 5 5 2 5 0 Speed Tap Static Pressure High Fire Temperature Rise vs External Static pressure in WC 0 1 0 2 0 3 0 4 0 5 0 6 0 7 Low 90 91 91 92 101 108 114 ML 72 72 74 74 77 80 91 MH 58...

Page 39: ...Static pressure in WC Low 6 6 648 6 6 648 6 4 639 6 2 630 6 0 612 5 8 592 5 4 565 ML 7 6 772 7 2 739 7 1 730 6 8 704 6 6 683 6 3 661 6 1 641 MH 9 0 908 9 0 905 8 7 888 8 5 871 8 3 842 8 0 818 7 7 796 High 12 5 1270 11 7 1200 11 2 1150 10 7 1110 10 2 1060 9 7 1020 9 2 969 Speed Tap Static Pressure High Fire Temperature Rise vs External Static pressure in WC 0 1 0 2 0 3 0 4 0 5 0 6 0 7 Low 98 98 98 ...

Page 40: ...Riello Connections Thermostat Humidistat connections C Common ground W Thermostat call for heat R 24 VAC to thermostat G Thermostat call for fan Y Thermostat call for cool DEHUM Humidistat call for dehumidification TXV systems ONLY Male quick connect terminals S1 3 120 VAC Hot N1 7 120 VAC Neutral EAC Electronic Air Cleaner 120 VAC connection FAN Fan On Signal X 24 VAC from transformer C 24 VAC co...

Page 41: ... will light when the control receives a call for dehumidification Refer to the Cool Mode section for the control operation Thermostat call for fan G 24 VAC thermostat input A call for fan is recognized when the thermostat connects G to R This input has an indicator LED in that will light when the control receives a call for fan Refer to the Fan Mode section for the control operation B Outputs PSC ...

Page 42: ...ved from the thermostat If no other mode is calling for blower operation the control will operate the fan relay K4 and power the Low blower speed terminal The fan mode will be operated as long as the G input is calling and neither the Heat mode nor the Cool mode is calling for blower operation When the Heat and Cool modes call for blower operation their respective outputs will take precedence afte...

Page 43: ...ed tap only In the case of thermostat calls for Y and W together blower speed selection will be determined by the input that was first initiated In the case where the control is in a cooling mode with both Y and W inputs energized and then the Y input is removed the cooling blower off time will be executed prior to the control switching into a heating mode In the case where the control is in a hea...

Page 44: ...puts and are located directly below those inputs They will light to indicate the presence of these signals The red Board Status LED has two functions It will light when the board recognizes a valid input signal and will stay lit until all valid signals are removed This is intended to show that the board is functioning and able to respond to input signals It will flash rapidly while 120VAC is missi...

Page 45: ...nd relatively clean of dirt and debris e Make sure the thermostat is set in the heating mode of operation Operating Instructions i STOP Read the safety information above ii Set the thermostat to the lowest setting iii Turn off all electric power to the appliance iv This appliance is equipped with an ignition system that automatically lights the burner Do not try to light the burner by hand v Rotat...

Page 46: ...following test instruments are required A smoke density measuring and rating device A carbon dioxide CO2 or oxygen O2 analyzer A flue gas temperature measuring device e g thermocouple or thermister probe with readout device An analog or digital multimeter and An oil pressure gauge capable of reading 0 150 PSIG To initially fire the oil burner proceed in the following manner a Turn the disconnectin...

Page 47: ...tment should be made using combustion instrumentation for smoke carbon dioxide CO2 or excess oxygen O2 and flue gas temperature In order to achieve the most efficient combustion the following steps must be taken COMBUSTION HEAD SETTING FOR 2 STAGE RIELLO BURNER This is done when fitting the nozzle with the blast tube removed It depends on the output of the burner and is carried out by rotating the...

Page 48: ... turns of the rod a hole 3 at its end facilitates counting the number of turns AIR DAMPER ADJUSTMENT The settings indicated in the schedule refer to the burner with its metal cover fitted and the combustion chamber with zero depression These regulations are purely indicative Each installation however has its own unpredictable working conditions actual nozzle output positive or negative pressure in...

Page 49: ...ner remains permanently in the 2nd stage Loosen the nut 6 turn the screw 7 until the air shutter 1 reaches the position desired Then lock the nut 6 Pressure regulation this is set at 170 psi at the factory Should such pressure be reset or changed just turn the screw 8 The pressure gauge must be mounted in place of cap 5 i SMOKE A smoke sample should be drawn from the heat exchanger flue passageway...

Page 50: ...he supply air temperature minus return air temperature Under steady state operating conditions the temperature rise across the heating section should be approximately 66ºF A higher temperature rise will slightly lower the heating efficiency A lower temperature rise will slightly raise efficiency but may cause condensation The supply air temperature should be measured in the supply air trunkline ap...

Page 51: ...rature Rise To avoid injury from moving parts or electrical shock shut off the power to the appliance before removing supply air blower compartment door and servicing this appliance All OH6 OH8 models are designed and wired at the factory for a blower speed during heating that should result in an approximate temperature rise of 66 F The temperature rise through the heating section for any given bl...

Page 52: ...t control as follows i Shut off incoming power ii Block return air opening or disconnect blower motor leads iii Restore power to appliance iv In the heating mode set the thermostat above room temperature producing a call for heat v When high air temperatures are reached within the heating section the high limit control should act to shutdown the burner vi Shut off the electrical power IMPORTANT Re...

Page 53: ...terials damage from rust or corrosion soot or carbon build up EXTERIOR OF FURNACE The furnace exterior should be inspected for signs of excessive heat such as discoloration of materials and damage from rust or corrosion FLUE PIPE VENT PIPE OR CONNECTOR The furnace vent pipe should be inspected for signs of rust corrosion pitting or holes in pipe and leakage around seams in pipe indicated by soot o...

Page 54: ...ments Contact a qualified service person to adjust and start burner E FILTER CLEANING AND LOCATION cWARNING To avoid injury from moving parts hot surfaces or electrical shock shut off the power to the furnace before removing any furnace access doors to service the air filters The air filters should be inspected each month and cleaned when dirty Cleaning the air filters frequently may reduce airbor...

Page 55: ...on and Routine Maintenance section of this manual 5 That failure to maintain and operate this appliance in accordance with these instructions could result in hazardous conditions property damage and bodily injury It may also void the limited warranty on the appliance 6 Review with and encourage the user to read the label reproductions and all warnings and instructions outlined on the front cover a...

Page 56: ... 2 Burner Visually check the burner and below the burner for indications of oil leaks Correct any if found Remove the burner and measure the ignition electrode gap It should be set to 5 32 inch Adjust it if necessary Clean any accumulation of dust dirt or debris from the air shutter or air band openings If necessary clean housing and blower wheel with a damp cloth Use a vacuum to remove any lint o...

Page 57: ...urner and the burner mounting plates When removing the clean out plugs turn T handle counterclockwise approximately two 2 full turns or just until the plug is able to be pulled from tube Take care not to remove T handle from assembly 2 With access to the inside of the heat exchanger through the burner area clean out openings and vent pipe connection it is possible to use a long flexible wire brush...

Page 58: ...53 Figure 24 Heat Exchanger Clean Outs Vacuum Hose Length OH6 8FT OH8 8FT Fig 25 Recommended method and device for cleaning inside of heat exchanger ...

Page 59: ...hey are not exceeding rating label current specifications for each component Also refer to Table 10 in the electrical wiring section of this manual for electrical specifications on these components 4 Check for correct operation and proper settings if manually adjustable of all controls E SUPPLY RETURN AIR BLOWER Check in the blower compartment for dust dirt debris and for the presence of insects R...

Page 60: ...an extended period of time several steps can be taken to help insure a smooth and reliable restart of the heating system ON SHUTDOWN 1 Close oil supply or manual shutoff valve 2 Disconnect all electrical power to the unit 3 Fill the oil tank to reduce water condensation in the tank 4 If the shutdown period will exceed one heating season an oil stabilizer should be added to the oil tank Consult you...

Page 61: ...il line as soon as the burner motor starts rotating To bleed the fuel pump attach a clear plastic hose over the vent plug refer to Figure 27 Loosen the plug and catch the expelled oil in an empty container Tighten the plug when all the trapped air appears to be purged If the burner stops during bleeding wait three to five minutes for the control safety switch to cool Then manually reset the switch...

Page 62: ...mostat The unit will cycle on and off automatically as required to maintain the air temperature within the residence as closely as possible to the thermostat setting However in rare cases the unit may shutdown automatically during a normal cycle or may not operate under seemingly normal conditions If the unit will not operate in the heating mode it may be possible to reactivate the unit by resetti...

Page 63: ...ce without clean air filters in place This appliance requires air for combustion ventilation and cooling Do not block or obstruct air openings in the unit and the air space around the perimeter of the unit 1 At least every three months under normal usage conditions check and clean all air filters in the appliance and if present in the duct system If excessively dirty air filters are not cleaned or...

Page 64: ...op of the burner blower and remove the plug in portion of the cad cell by pulling it forward from and clear of the receptacle Connect an ohmmeter across cad cell pins With the cell exposed to direct room light the measured resistance should be less than 2500 ohms in fact it may be less than 200 ohms 3 Check the resistance across the cad cell pins with the cell covered protected from exposure to am...

Page 65: ...60 VIII Sequence of Operations Flow Chart ...

Page 66: ...61 ...

Page 67: ...62 IX Trouble Shooting Flow Chart ...

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Page 72: ...L LINER FUEL LINE FILTER DRAFT CONTROL COMBUSTION TESTS Operate burner at least 10 minutes before CO2 in stack pipe INITIAL SERVICE SERVICE SERVICE INSTALLATION Draft Over fire Draft in stack pipe Smoke number Furnace room temp Gross stack temp Net stack temp Gross stack minus furnace room temp Efficiency Nozzle size and spray Date NOTES INSTALLER NAME ADDRESS manual carefully before making tests ...

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