Daikin Gas Unit DCG036090

Remove the field connected thermostat wire from terminal R on TB1 terminal block

Place jumpers on TB1 terminal block

Operational Sequence Observation

Is the 24-volt control circuit energized through TRANS1?

Simulate a mechanical call for cooling by placing a jumper across terminals R and Y of TB1

Is the cooling energized when room temperature is above the thermostat set-point?

Inspect belt for visible wear or damage

Ensure belt is properly seated in the sheave grooves

Measure the span length (t) in inches

Measure the center distance (C) in inches

Measure the larger sheave diameter (D) in inches

Measure the smaller sheave diameter (d) in inches

Measure the deflection height (h) in inches

Ensure the heating system is turned off

Is the weather condition suitable for inspection?

Visual Inspection of Burner Flames

Check the color and stability of the burner flames

Reinstall the heat exchanger door

Remove furnace section access panel

Inspect all flue product carrying areas for deterioration

Inspect and clean the vent outlet (bird screen) on the access panel

Log CO₂ measurements and observations of the flame

Are the flames stable, soft, and blue without yellow tips?

Do the flames extend directly outward from the burner without curling, floating, or lifting off?

Ensure the gas valve has a tapped opening for measurement

Use a 'U' Tube manometer with a scale range from 0 to 12 inches of water

Ensure burners are operating during measurement

Remove field connected thermostat wire from terminal R, W1, and W2 on TB1

Place jumper wire between R, W1, and W2 to engage high stage heat

For 045 kbtu/hr units, only jumper R to W1