Figure 513. One-tan thermostatic expansion valve, adjustment.

CAUTION. NEVER ADJUST THE EXPANSION VALVE UNLESS IT IS ABSOLUTELY NECESSARY. WHEN ADJUST-

ING THE EXPANSION VALVE. ALLOW AT LEAST 20 MINUTES BETWEEN EACH ADJUSTMENT. THIS

TlME ELEMENT IS VERY IMPORTANT AND MUST BE OBSERVED.

ADJUSTMENT

STEP 1. TAPE THE BULB OF A THE THERMOMETER TO SUCTION TUBE NEAR SENSING ELEMENT. INSULATE

THERMOMETER BULB.

STEP 2. INSTALL A SUITABLE PRESSURE GAGE AT SUCTION TUBE SERVICE VALVE (PAR. 5-20).

STEP 3.

MUST STABILIZE).

STEP 4. CHECK THERMOMETER AND PRESSURE GAGE READINGS. COMPARE READINGS WITH FIGURE 5-14

THERMOMETER READING SHOULD BE APPROXIMATELY 10 F HIGHER THAN TEMPERATURE

GIVEN ON FIGURE.

STEP 5. REMOVE BUTTON PLUG (SHOWN ABOVE). REMOVE CAP AND TURN ADJUSTING SCREW ONE

TURN CLOCKWISE TO INCREASE SUPERHEAT 4 F. OR ONE TURN COUNTERCLOCKWISE TO

DECREASE SUPERHEAT. INSTALL CAP. INSTALL BUTTON PLUG.

ME 4120 -222 -14/5-13

Figure 513. One-tan thermostatic expansion valve, adjustment.

AGO 20053A