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LG Electronics 395CAV manual

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Table of contents for the manual

  • Page 1

    NOTE: Read the entire instruction manual before starting the installation. This symbol → indicates a change since the last issue. Index Page SAFETY CONSIDERATIONS .....................................................1 Clearances From Combustible Materials .................................1 Dimensional Drawing .....................................[...]

  • Page 2

    ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE CAUTION: Electrostatic discharge can affect electronic components. Take precautions during furnace installation and servicing to protect the furnace electronic control. Precautions will prevent electrostatic discharges from personnel and hand tools which are held during the procedure. These precau[...]

  • Page 3

    4. If you touch ungrounded objects (recharge your body with static electricity), firmly touch furnace again before touch- ing control or wires. 5. Use this procedure for installed and uninstalled (un- grounded) furnaces. 6. Before removing a new control from its container, dis- charge your body’s electrostatic charge to ground to protect the cont[...]

  • Page 4

    CAUTION: Air for combustion must not be contami- nated by halogen compounds, which include fluoride, chloride, bromide, and iodide. These elements are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air fresheners, and other household products. All fuel-burning equipment must be supplied with air for combus- tion of the fue[...]

  • Page 5

    c. When ducts are used, they must be of the same cross- sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular ducts must not be less than 3 in. (See Fig. 3.) WARNING: Do not install the furnace on its back; safety control operation will be adversely affected. Never connect return-air ducts to th[...]

  • Page 6

    4. Adjust outside nut to provide desired height, and tighten inside nut to secure arrangement. V. GAS PIPING Gas piping must be installed in accordance with national and local codes. Refer to the current edition of the NFGC. Canadian installations must be installed in accordance with NSCNGPIC and all authorities having jurisdiction. Refer to Table [...]

  • Page 7

    WARNING: Use the proper length of pipes to avoid stress on the gas control manifold. Failure to follow this warning can result in a gas leak, causing fire, explosion, personal injury, or death. CAUTION: Connect the gas pipe to the furnace using a backup wrench to avoid damaging gas controls. WARNING: Never purge a line into a combustion chamber. Ne[...]

  • Page 8

    The furnace must have a 115-v power supply properly connected and grounded. Proper polarity must be maintained for correct operation. Thermostat wire connections at R, W, C, and Y must be made at the 24-v terminal block on the control board. The gas service pressure must not exceed 0.5 psig (14-in. wc), but must be no less than 0.16 psig (4.5-in. w[...]

  • Page 9

    1. Heating mode When the wall thermostat "calls for heat," the R-W circuit closes. The furnace control performs a self-check, verifies the pressure switch contacts are open, and starts inducer motor. a. Prepurge period—As the inducer motor comes up to speed, the pressure switch contacts close to begin a 15-sec prepurge period. b. Ignito[...]

  • Page 10

    → Fig. 11—Unit Wiring Diagram A95335 PCB BLOWER OFF DE LAY SELECTION CHAR T 90 SEC 135 SEC 180 SEC 225 SEC GVR HI/LO RELAY SEC-1 SEC- 2 PL1 3 2 1 6 5 4 9 87 LED TEST/TWIN BLOWER OFF DELAY G R Y W C HUM HSIR IDR BLWR BLOWER SPEED SELECT FU1 COOL HEAT L2 PL3 PL2 VAC 120 L1 PR1 1 2 1 2 3 PR2 24 VAC-3A FUSE SPARE-2 SPARE-1 EAC-1 EAC-2 C 1.5 AMP 12 [...]

  • Page 11

    unit and the combined R-Y and R-G circuits start the furnace blower motor on cooling speed. The EAC-1 termi- nal is energized with 115v when the blower is operating on cooling speed. When the thermostat is satisfied, R-G and R-Y circuits are broken. The furnace blower and EAC continue operating on cooling speed for an additional 90 sec. 3. Continuo[...]

  • Page 12

    b. Check gas input rate by clocking gas meter. (1.) Obtain average yearly heat value for local gas supply. (2.) Check and verify orifice size in furnace. NEVER ASSUME THE ORIFICE SIZE. ALWAYS CHECK AND VERIFY. CAUTION: DO NOT redrill burner orifices. Improper drilling (burrs, out of round, etc.) can cause excessive burner operating noise and misdir[...]

  • Page 13

    (3.) When correct input is obtained, replace regulator seal cap. Main burner flame should be clear blue, almost transparent. (See Fig. 13.) d. High altitude—In the United States gas input on rating plate is for altitudes up to 2000 ft. Ratings for altitudes over 2000 ft must be 4 percent less for each 1000 ft above sea level. To obtain the adjust[...]

  • Page 14

    3. Set thermostat heat anticipator. The thermostat heat anticipator must be set to match the amp draw of the electrical components in the R-W circuit. Accurate amp draw readings can be obtained at thermostat subbase terminals R and W. Fig. 14 illustrates an easy method of obtaining the actual amp draw. The amp reading should be taken after the blow[...]

  • Page 15

    A94328 SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including:  • Unit Familiarization • Maintenance  • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs is availa[...]

  • Page 16

    © 1996 BDP Co. • P.O. Box 70 • Indianapolis, IN 46206 Printed in U.S.A. —16— 395c4010 Catalog No. BDP-3339-518[...]