LG Electronics 395CAV Ðspeed Selector, Checklist, Color Speed Factory Attached to

TABLE 9ÐSPEED SELECTOR

COLOR	SPEED	FACTORY-
		ATTACHED TO
Black	High	Cool
Yellow (When	Medium-High	Spare
present)
Blue	Medium-Low	Heat
Red	Low	Spare
White	Common	COM

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 blower motor has started. See the thermostat manufacturer's instructions for adjusting the heat anticipator and for varying the heating cycle length.

NOTE: When using an electronic thermostat, set the cycle rate for 3 cycles per hr.

THERMOSTAT SUBBASE

TERMINALS WITH

THERMOSTAT REMOVED

HOOK-AROUND

VOLT/AMMETER

R Y W G

10 TURNS

FROM UNIT 24-VOLT

TERMINAL BLOCK

EXAMPLE:	5.0 AMPS ON AMMETER	= 0.5 AMPS FOR THERMOSTAT SETTING
	10 TURNS AROUND JAWS

A80201

Fig. 14ÐAmp Draw Check With Ammeter

E.Check Safety Controls

The flame sensor, gas valve, and pressure switch were all checked in the Start-up Procedures section as part of normal operation.

1.Check primary limit control.

This control shuts off the combustion control system and energizes the circulating-air blower motor if the furnace overheats.

The preferred method of checking the limit control is to gradually block off the return air after the furnace has been operating for a period of at least 5 minutes. As soon as the limit has shut off the burners, the return-air opening should be unblocked. By using this method to check the limit control, it can be established that the limit is functioning properly and operates if there is a motor failure.

2.Check draft safeguard switch.

The purpose of this control is to permit the safe shutdown of the furnace during certain blocked vent conditions.

a.Disconnect power to furnace and remove vent connector from furnace outlet collar. Be sure to allow time for vent pipe to cool down before removing.

b.Restore power to furnace and set room thermostat above room temperature.

c.After normal start-up, allow furnace to operate for 2 minutes, then block flue outlet 100 percent. Furnace should cycle off within 2 minutes.

d.Remove blockage and reconnect vent pipe to furnace outlet collar.

e.Wait 5 minutes and then reset draft safeguard switch.

3.Check pressure switch.

This control proves operation of draft inducer blower.

a.Turn off 115-v power to furnace.

b.Remove control door and disconnect inducer motor lead wires from wire harness.

c.Turn on 115-v power to furnace.

d.Set thermostat to "call for heat" and wait 1 minute. When pressure switch is functioning properly, hot surface ignitor should NOT glow and control center diagnostic light flashes a 31 fault. If hot surface ignitor glows when inducer motor is disconnected, shut down furnace im- mediately. Determine reason pressure switch did not function properly and correct condition.

e.Turn off 115-v power to furnace.

f.Reconnect inducer motor wires, replace control door, and turn on 115-v power.

F.Checklist

1.Put away tools, instruments, and clean up debris.

2.Verify manual reset switches have continuity.

3.Ensure blower and control access doors are properly in- stalled.

4.Cycle test furnace with room thermostat.

5.Check operation of accessories per manufacturer's instruc- tions.

6.Review User's Manual with owner.

7.Leave literature packet near furnace.,

Ð14Ð