warning - Nordyne

To check the heat anticipator setting either:1. Add the current draw of the system components;or2. Measure the current fl ow on the thermostatR-W circuit after the circulating blower motorhas started.Set the heat anticipator according to the thermostatmanufacturer’s instructions for heatanticipator settings.START-UP AND ADJUSTMENTSPrior to start-up, verify that:1. The line voltage power leads are securelyconnected, that the polarity of the connectionsis correct, and that the furnace isproperly grounded.2. The thermostat wires (R, W, Y, and G) aresecurely connected to the correct leads onthe terminal strip of the circuit board.3. The gas line service pressure does notexceed 10.0 in. water column (0.36 psig),and is not less than 4.5 in. water column(0.16 psig) for natural gas. For LP gas theline service pressure must not exceed 14in. water column (0.51 psig), and must notbe less than 11.0 in. W.C. (0.40 psig).4. The roll-out and vent safety manual resetswitches are closed. If necessary, press thered button to reset a switch. See Figure 30for location. DO NOT install a jumper wireacross a switch to defeat its function. If aswitch reopens on start-up, DO NOT resetthe switch without identifying and correctingthe fault condition which caused the switchto trip.5. The blower door is in place, closing the doorswitch in the line voltage circuit.6. The gas line has been purged and all connectionsare leak tight.Start-Up Procedure1. Set the thermostat to the lowest setting.2. Close the disconnect(s) to provide line voltageto the furnace.3. Follow the procedures given on the operatinginstructions label attached to the furnace.4. Set the thermostat above room temperatureand verify the sequence of operation. (Seethe SEQUENCE OF OPERATION.)5. After the furnace has run for approximatelyfi ve minutes, set the thermostat below roomtemperature and verify steps (9) through(11) of the SEQUENCE OF OPERATION.32Verifying and AdjustingFiring RateThe fi ring rate must be verifi ed for each installationto prevent over-fi ring the furnace.NOTE: The fi ring rate must not exceed the rateshown on the furnace rating plate. At altitudesabove 2000 ft. the fi ring rate must be adjustedas described in the high altitude section.Use the following procedure to determine thefi ring rate:1. Shut off all other gas fi red appliances.2. Start the furnace and allow it to run for atleast three minutes.3. Measure the time (in seconds) required forthe gas meter to complete one revolution.4. Convert the time per revolution to cubic feetof gas per hour using Table 13.5. Multiply the gas fl ow rate in cubic feet perhour by the heating value of the gas in Btuper cubic foot to obtain the fi ring rate in Btuh.Example:• Time for 1 revolution of a gas meter witha 1 cubic foot dial = 40 seconds.• From Table 9 read 90 cubic feet per hourof gas.• Heating value of the gas (obtainedfrom gas supplier) = 1040 Btu per cubicfoot.• Firing rate = 1040 x 90 = 93,600 Btuh.ConnectR & WForHeatingOnlyR Y G WRoomThermostatNOTE: The "Y"terminal on theUTEC control boardmust be connectedto the thermostatfor proper coolingmode operation.FIELD WIRINGLow VoltageConnectionsR C Y G WEAC HUM987654A/C Condensing UnitCOM24 V321Condensing UnitControl Box3 AmpFuseBlower OffTimingFlame Signal Light(Yellow)NeutralsUnused Motor Leads6 35 24 1Status Light(Red)60 90 120180TWINFigure 27. Low Voltage Field,Four-wire Heating/Cooling ApplicationsHUMM3M2M1HEATCOOLEACL1XFMR