INSTALLATION INSTRUCTIONS - Lennox

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Electrical ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures CAUTION Electrostatic discharge can affect electronic components. Take precautions during furnace installation and service to protect the furnace’s electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the furnace, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface, such as the gas valve or blower deck, before performing any service procedure. INTERIOR MAKE−UP BOX <strong>INSTALLATION</strong> MAKE−UP BOX FIGURE 37 Right Side INTERIOR MAKE−UP BOX <strong>INSTALLATION</strong> Left side FIGURE 38 MAKE−UP BOX The unit is equipped with a field make−up box. The make− up box may be moved to the right side of the furnace to facilitate installation. If the make−up box is moved to the right side, the excess wire must be pulled into the blower compartment. Secure the excess wire to the existing harness to protect it from damage. Refer to figure 40 for field wiring and figure 41 for schematic wiring diagram and troubleshooting. Select circuit protection and wire size according to the unit nameplate. The power supply wiring must meet Class I restrictions. Holes are on both sides of the furnace cabinet to facilitate wiring. Install a separate disconnect switch (protected by either fuse or circuit breaker) near the furnace so that power can be turned off for servicing. Before connecting the thermostat or the power wiring, check to make sure the wires will be long enough for servicing at a later date. Remove the blower access panel to check the length of the wire. Complete the wiring connections to the equipment. Use the provided unit wiring diagram and the field wiring diagram shown in figure 40. Use 18−gauge wire or larger that is suitable for Class II rating for thermostat connections. Electrically ground the unit according to local codes or, in the absence of local codes, according to the current National Electric Code (ANSI/NFPA No. 70) for the USA and current Canadian Electric Code part 1 (CSA standard C22.1) for Canada. A green ground wire is provided in the field make−up box. NOTE − The G43UF furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded. One line voltage EAC" accessory terminal is provided on the furnace control board. Any electronic air cleaner rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to the any of the NEUTRAL" terminals. See figure 42 for control board configuration. This terminal is energized whenever the blower is operating. One line voltage HUM" accessory terminal is provided on the furnace control board. Any humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to any of the NEUTRAL" terminals. See figure 42 for control board configuration. This terminal is energized in the heating mode whenever the combustion air inducer is operating. Page 28
G43UF and CONDENSING UNIT THERMOSTAT DESIGNATIONS (Refer to specific thermostat and outdoor unit.) Thermostat R W1 Y G C POWER HEAT COOLING INDOOR BLOWER COMMON G43UF Furnace R W Y G C FIGURE 39 Condensing Unit CONDENSING UNIT CONDENSING UNIT COMMON Install the room thermostat according to the instructions provided with the thermostat. See figure 39 for thermostat designations. If the furnace is being matched with a heat pump, refer to the FM21 installation instruction. Indoor Blower Speeds 1 − When the thermostat is set to FAN ON," the indoor blower will run continuously on the heating speed when there is no cooling or heating demand. 2 − When the G43UF is running in the heating mode, the indoor blower will run on the heating speed. 3 − When there is a cooling demand, the indoor blower will run on the cooling speed. TYPICAL G43UF FIELD WIRING DIAGRAM FIGURE 40 Page 29
Page 1 and 2: 2005 Lennox Industries Inc. Dallas,
Page 3 and 4: G43UF Parts Arrangement G43UF PARTS
Page 5 and 6: In order to ensure proper unit oper
Page 7 and 8: CAUTION Do not install the furnace
Page 9 and 10: The G43UF gas furnace can be instal
Page 11 and 12: Screw Removing the Bottom Panel Bot
Page 13 and 14: TABLE 3 OUTDOOR TERMINATION KITS AN
Page 15 and 16: Joint Cementing Procedure All cemen
Page 17 and 18: TYPICAL AIR INTAKE PIPE CONNECTIONS
Page 19 and 20: VENT TERMINATION CLEARANCES FOR NON
Page 21 and 22: Details of Intake and Exhaust Pipin
Page 23 and 24: INTAKE AIR GRADE 12" (305) MAX. for
Page 25 and 26: CAP O−RINGS CONDENSATE ASSEMBLY H
Page 27: Nominal Iron Pipe Size −Inches(mm
Page 31 and 32: INTEGRATED CONTROL BOARD (Automatic
Page 33 and 34: Heating Sequence Of Operation When
Page 35 and 36: Testing for Proper Venting and Suff
Page 37 and 38: Blower Motor Performance G43UF−24
Page 39 and 40: Service WARNING ELECTRICAL SHOCK, F
Page 41 and 42: Planned Service A service technicia
Page 43 and 44: Troubleshooting: Heating Sequence o
Page 45 and 46: Troubleshooting: Continuous Fan Seq
Page 47: Requirements for Commonwealth of Ma

INSTALLATION INSTRUCTIONS - Lennox

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