Thermo Products 30 Number of flashes, Cad Cell Resistance in ohms, Model R7184B, B.Cooling System

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All installations and services must be performed by qualified service personnel.

Number of flashes	Cad Cell Resistance (in ohms)
	Model R7184B
1	0 to 400
2	400 to 800
3	800 to 1600
4	1600 <

If it is necessary to troubleshoot the flame sensor independently of the burner primary, the following procedure may be used.

CAD CELL CHECKOUT PROCEDURE:

1.Stop burner and shutoff electrical power to the appliance.

2.Open burner junction box (on top 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 ambient light). The resistance should be greater than 20,000 ohms.

4.If cell resistances are different from above, replace the plug-in portion of cell, (Honeywell Part No. 130367).

5.Carefully reinsert the plug-in portion of the cad cell into the receptacle. If the cad cell appears to be functioning correctly, troubleshoot the fan control module and the safety and ignition control (primary control) module, according to the Honeywell instructions covering the devices.

B.Cooling System:

NOTICE: Before troubleshooting, familiarize yourself with the Initial Startup and the Cooling System Troubleshooting Flowchart.

If the air conditioning system will not operate, check the following points before calling a qualified heating contractor.

1.Is the disconnect switch or the circuit breaker serving the appliance switched on? If equipped, have the disconnect switch fuses “blown” or has the circuit breaker tripped? If an electrical fault has occurred more than once, call your qualified service person to diagnose the cause and perform the required repair(s).

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Contents Page Contents SECTION I. SAFETY INFORMATION Page IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE Waterproof type connectors must be used when connecting electrical power and control wiring to the unit to prevent moisture from being drawn into the unit during operation For initial start-upof the appliance after installation, it may be necessary to purge the air out of the oil line. A qualified heating contractor should do this 1.This appliance shall be used with only the type of fuel oil for which it is approved. Refer to the appliance-ratinglabel for the required type of fuel II. GENERAL INSTRUCTIONS III.GENERAL INSTALLATIONb.Non-combustiblematerial A. Codes and Clearancesa.Combustible material B.Selection of Installation Location The unit is manufactured with runner supports that raise the unit, about 1.25 inches above the mounting base, allowing air circulation beneath the metal surfaces. This clearance helps to promote air circulation under the base that allows the unit to be mounted on combustible materials. This clearance also helps to reduce metal corrosion caused by a buildup of moisture under the appliance C.Venting of Combustion Products D. Condensate Drain FIGURE 2 Vent Terminal Mounting PositionE. Oil Tank and Piping 5.A readily accessible, design-certified,manual oil shutoff valve, with a non- displaceable rotor member, shall be installed in the fuel oil supply piping within 6 feet of the appliance F. Oil Filter G. Burner Specifications And PerformanceOil Pump H. Airflow Requirements and Sizing of Duct Work 6.The following method can be used to size ductwork when air velocities are low to moderate h.The resistance of the take-offand the outlet register or return grill should then be summed together to determine the total pressure drop for each branch. This value should be close to the assumed value for the pressure drop of the system. If it is not close, then flowrates for each branch must be adjusted, or the design of the duct system must be altered, to give the proper pressure drops. Usually, the cross-sectionalarea of the ductwork should be changed in order to adjust the pressure drop to a suitable value 7.The supply and return air ducts, or flexible joints, should be carefully secured and sealed to the appliance housing to prevent air leakage from, or into, the duct system. For best performance, insulate the outside surfaces of the ducts to reduce heat loss from, or heat gain to, the ducts. The insulation system should be carefully selected and installed to minimize water and moisture absorption by the insulation I.Air Filters 1.Filter Installation J. Electrical Wiring Typically, control wiring between the outdoor appliance and the indoor thermostat, and if used, electronic air cleaner or humidifier, will be required. Field wiring of control circuits should consist of copper conductors rated for at least 240 VAC with an insulation temperature rating conforming to Type T wire, 35C temperature rise. Depending upon code requirements, rigid or flexible conduit is recommended, and may be required. Make connections between the thermostat, and electronic air cleaner or humidifier if used, and the fan control module, inside the burner compartment. Consult the wiring diagram for the appropriate connection points on the thermostat and the fan control module 3.All wiring sizes must comply with local codes or the National Electrical Code. To minimize voltage drop to the appliance, the next larger size wire should be used when long wiring runs, in excess of 100 ft., are employed. Refer to the wiring diagrams when wiring or servicing Figure 4 The Fan Control Module Figure 5 Heat Anticipator Adjustment Scale 2. Thermostat Anticipator SettingPreferred method of adjustment 3. Blower Motor Speed Selection IV. STARTUP PROCEDURES A.Heating System To Turn Off Oil to Appliance For Your Safety Read Before Operatingi.STOP! Read the safety information above Operating Instructions2.Adjustment of Burner Combustion g.Turn the disconnecting switch to “ON” ii.CARBON DIOXIDE CO2 OR OXYGEN O2 Take a CO2 sample from flue passageway. It is possible to achieve readings of up to 14% CO2 or 2% O2 , but it is better to have a slightly lower CO2 or higher O2 reading with zero smoke measured. To achieve a lower CO2 reading, open the air band, or shutter, on the burner until zero smoke is measured 3.Adjustment Of Heat Input Rate 4.Setting Supply Air Temperature Rise 5.Checkout Procedure Page B.Cooling Section 1.Initial Startup 2.Definition of Subcooling 4.Definition of Superheat 3.Condenser Subcooling5.Evaporator Superheat V. INSTALLERS INSTRUCTIONS TO USER VI. DEALER MAINTENANCE B.Heat Exchanger Remove the clean-outcovers. Also, remove the burner compartment cover, the burner, and the burner mounting plate. When removing the clean-outcovers, special care must be taken not to damage the gaskets. Should any of the gaskets separate, show evidence of cracks or breaks, or otherwise be unable to provide the necessary seal, the gasket must be replaced before reattaching the clean-outcovers, refer to Figure Figure 10 View of OPB Heat Exchanger Burner Operation sectionC.Electrical System E. Supply/Return Air Filter 1.Filter maintenance procedure2.Filter replacement D. Supply/Return Air BlowerF. Extended Appliance Shutdown Figure 13 Location of Oil Pump Vent Plug 2.Remove the burner compartment cover Burner Motor The following maintenance points should be reviewed periodically to assure the heating and cooling systems continue to function properly ducts for any signs of collapse, holes, or excessive corrosion. Repair or replace components as required A.Heating System VIII. TROUBLESHOOTINGPower must be disconnected before servicing Diagnostic FeaturesModel R7184B CAD CELL CHECKOUT PROCEDURENumber of flashes Cad Cell Resistance in ohms2.Is the sub-baseof the thermostat switched to the “COOL” position? IX. REFERENCES X. APPENDIX A SOURCES FOR REFERENCED STANDARDS XI. APPENDIX B CALCULATIONS Example Figure 15 Plan View of a Typical Residence Area for Example See page 75 for a copy of the ASHRAE chart So, the total equivalent straight duct length is or approximately the same as without the elbow Using the previous pressure drop equation, the pressure drop through segment “A” is 0.0321 in. W.G. Then, the pressure drop for the “D” and “E” branch is Likewise for the other branches PSIG Page Now, the degree of superheat can be calculated Page All installations and services must be performed by qualified service personnel Start trial for ignition A. SEQUENCE OF OPERATIONS FOR THE HEATING SYSTEMStandby At any time the oil valve is not energized StartControl System Action Start trial for ignition A. SEQUENCE OF OPERATIONS FOR THE HEATING SYSTEMStandby At any time the oil valve is not energized StartPage Page CORRECT INSERTION OR AIR TUBE BURNOFF MAY OCCUR IS THE PROBLEM DELAYED IGNITION?ARE VENT TERMINAL AND HEAT EXCHANGER CLEAN? PROPER COMBUSTION ACHIEVED?EFFECTS OF PRESSURE ON NOZZLE FLOW RATE Page 1.201.6 Check capacitance of the run capacitor 1Loose wire connections 3.301.2 Check for a properly sized expansion valve Model No Heating Performance using # 2 fuel oilNominal Electrical Power Requirements Dimensions & WeightXVI. APPENDIX G REPLACEMENT PARTS LIST Page