Install Instructions

ManualsBrandsEmerson Flow Controls ManualsAFA(E) Series Thermal Expansion Valves3/8" x 3/8"-1/2" SAE AFA(E)-Series Internally Equalized Valve (1/2 Ton)

AFA E 1/2 H C 3/8 x 1/2

Valve External Capacity Refrigerant Charge SAE Connection

Series Equalizer Nominal Code Code Size

(omit for Rating in F = R12 C = med temp

internal) Tons H = R22 Z = low temp

R = R502 W = MOP (if needed)

AFA(E) NOMENCLATURE

MEASURING SUPERHEAT

1. Determine the suction pressure with an accurate gauge

at the evaporator outlet (see P in figure 2). On self-

contained systems, the suction pressure may be read at

the compressor suction connections.

2. From refrigerant pressure-temperature tables, determine

saturation temperature at observed suction pressure

(TEMP

3. Measure temperature of suction gas at thermal expan-

sion valve remote bulb location (TEMP

4. Subtract saturation temperature (read from tables in step

2) from temperature measured in step 3; the difference

is the superheat of the suction gas.

SUPERHEAT ADJUSTMENT

Emerson thermal expansion valves are factory set to a

specific superheat - however, the superheat should be

adjusted for the application. To adjust the valve to other

superheat settings:

1. Remove the seal cap from bottom of valve.

2. Turn the adjustment screw clockwise to increase

superheat and counterclockwise to decrease superheat.

One complete 360° turn changes the superheat approxi-

mately 3-4°F, regardless of the refrigerant type. As

much as 30 minutes may be required for the system to

stabilize after the adjustment is made.

3. Replace and hand-tighten seal cap.

Caution: There are 10 turns on the adjustment stem. When

adjusting superheat setting - when stop is reached, any

further turning adjustment will damage valve.

AFA(E) CONNECTIONS

TOLERANCE ± 5/32 ± 1/32 ± 3/64

INLET OUTLET A B C

3/8 1-41/64

1/4 1/2 1-23/64

elbow 5/8 1-63/64

3/8 – 1/2 1-47/64

3/8 1-41/64

3/8 1/2 1-23/64

elbow 5/8 1-63/64

3/8 – 1/2 1-47/64

1-41/64 1-5/16

1-3/32

1-49/64

EXTERNAL EQUALIZER

EVAPORATOR

REMOTE

BULB

EXPANSION

VALVE

DISTRIBUTOR

INCORRECT

REMOTE BULB LOCATION

SHOWN TRAPPED

EXTERNAL EQUALIZER

EVAPORATOR

REMOTE

BULB

EXPANSION

VALVE

DISTRIBUTOR

CORRECT

REMOTE BULB LOCATION

SHOWN FREE-DRAINING

69 PSIG = 40°F

59 PSIG = 33°F

59 PSIG = 40°F

EXTERNAL EQUALIZER

59 PSIG

40°F

TEMP

– TEMP

= SUPERHEAT

40° – 33° = 7°

FIGURE 2

FIGURE 1

AFA(E)

DIMENSIONAL DIAGRAMS & TABLE