Magic-Pak MGE4-09-18 Installation And Maintenance Instructions Manual
Also see for MGE4 Series: Installation and maintenance instructions
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506326-01 Page 13 of 20Issue 0941OPERATIONOperation of the unit is automatic and will provide heatingand cooling depending on the setting of the thermostat.Heating1. Turn on main power supply.2. Open manual gas shutoff valve.3. Set thermostat system to “HEAT”.4. Set thermostat to temperature desired.Sequence of Operation1. Thermostat calls for heat.2. Combustion blower starts and proper air flow is provenby the pressure switch closing.3. Blower continues to operate for 30 seconds prior to theburners lighting.4. Ignition control begins spark and opens gas valve. Theburners are lit. Ignition is proved through flame sensor.5. Circulating air blower starts 30 seconds after the burnerslight.6. When the thermostat is satisfied, the burners andcombustion blower shut off.7. Circulating air blower will shut off 120 seconds later.If the burners should fail to ignite, the ignition control will try toignite the burners a total of three times. Should the burnersfail to ignite within the three trials for ignition, the ignition controlwill lock out for 1 hour before beginning another ignition cycle.To reset the control, turn the thermostat down or off for 10seconds and then set to desired setting. At this time, the ignitionsequence will try again.Cooling1. Set thermostat system switch to “COOL”.2. Set thermostat to temperature desired.NOTE: When Y is energized, the combustion blower willoperate for 10 seconds. The purpose of this action is todeter insect nesting in the flue pipe.To Shut Down UnitFor temporary or short periods of shutdown, set thethermostat system switch to “OFF”. For a prolonged periodof shutdown, set the thermostat system switch to “OFF” andturn off the electrical power supply and the gas supply to theunit.Adjustments – Heating SectionTemperature RiseAt time of installation, the temperature rise must be adjustedto be within the range specified on the unit rating plate.Checking and Adjusting Gas InputThe gas input must not exceed the figures shown on therating plate. The unit is equipped for rated inputs withmanifold pressures of: 3.5" w.c. for natural gas and 10.0"w.c. for propane. The furnace requires conversion for usewith propane (a propane conversion kit is available from themanufacturer).The manifold pressure can be measured by removing thepipe plug in the downstream side of the gas valve andconnecting a water manometer or gauge.Only small variations in gas input may be made by adjustingthe regulator. In no case should the final manifoldpressure vary more than 0.3" w.c. for natural gas or 0.7"w.c. for propane.x 3600 x= Cubic Feet Per RevolutionBTU/HRINPUT # Seconds Per RevolutionHeatingValueTo adjust the regulator, turn the adjusting screw on theregulator clockwise to increase pressure and input orcounterclockwise to decrease pressure and input.For Natural Gas: Check the furnace rate by observing thegas meter, when available, making sure all other gasappliances are turned off. The test hand on the meter shouldbe timed for at least one revolution. Note the number ofseconds for one revolution.The heating value of the gas can be obtained from the localutility company.The furnace rate must be within +/- 2% of the appliancerating input.CAUTION |
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