SERVICING

S-105A PISTON CHART FOR ASX13, GSX13, SSX14, ASX14, ASZ13, GSZ13 units

S-105B THERMOSTATIC EXPANSION VALVE

The expansion valve is designed to control the rate of liquid refrigerant flow into an evaporator coil in exact proportion to

Remote

Orifice

Condenser

Size

A/GSX130181A

0.049

A/GSX130181B

0.051

A/GSX130241A

0.053

A/GSX130241B

0.057

A/GSX130301

0.059

A/GSX130301B

0.061

A/GSX130361A

0.068

A/GSX130361B

0.070

A/GSX130421A

0.074

A/GSX130421B

0.076

A/GSX130481A

0.080

A/GSX130481B

0.080

A/GSX130601

0.092

SSX140181A

0.049

SSX140241A

0.057

SSX140301A

0.063

SSX140361A

0.067

SSX140421A

0.074

SSX140421B

0.074

SSX140481A

0.079

SSX140601A

0.088

A/SSX140181B

0.052

A/SSX140241B

0.055

A/SSX140301B

0.065

A/SSX140361B

0.070

Remote

Orifice

Heat Pump

Size

A/GSZ130181

0.049

A/GSZ130241

0.057

A/GSZ130301

0.063

A/GSZ130361

0.068

A/GSZ130421

0.074

A/GSZ130481

0.078

A/GSZ130601

0.088

SSZ140361A*

0.071

SSZ140421A*

0.076

SSZ140481A*

0.080

SSZ140601A*

0.088

the rate of evaporation of the refrigerant in the coil. The amount of refrigerant entering the coil is regulated since the valve responds to temperature of the refrigerant gas leaving the coil (feeler bulb contact) and the pressure of the refrigerant in the coil. This regulation of the flow prevents the return of liquid refrigerant to the compressor.

The illustration below shows typical heatpump TXV/check valve operation in the heating and cooling modes.

COOLINGHEATING

TXV VALVES

Some TXV valves contain an internal check valve thus eliminating the need for an external check valve and bypass loop. The three forces which govern the operation of the valve are: (1) the pressure created in the power assembly by the feeler bulb, (2) evaporator pressure, and (3) the equivalent pressure of the superheat spring in the valve.

0% bleed type expansion valves are used on indoor and outdoor coils. The 0% bleed valve will not allow the system pressures (High and Low side) to equalize during the shut down period. The valve will shut off completely at approxi- mately 100 PSIG.

30% bleed valves used on some other models will continue to allow some equalization even though the valve has shut-off completely because of the bleed holes within the valve. This type of valve should not be used as a replacement for a 0% bleed valve, due to the resulting drop in performance.

The bulb must be securely fastened with two straps to a clean straight section of the suction line. Application of the bulb to a horizontal run of line is preferred. If a vertical installation cannot be avoided, the bulb must be mounted so that the capillary tubing comes out at the top.

THE VALVES PROVIDED BY GOODMAN ARE DESIGNED TO MEET THE SPECIFICATION REQUIREMENTS FOR OPTIMUM PRODUCT OPERATION. DO NOT USE SUB- STITUTES.

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Goodmans SSZ, GSZ, ASZ, SSX, ASX, DSZ, DSX, GSX manual 105B Thermostatic Expansion Valve, TXV Valves