Publicidad
Idiomas disponibles
Idiomas disponibles
AFA
Valve
Series
MEASURING SUPERHEAT
1.
Determine the suction pressure with an accurate gauge
at the evaporator outlet (see P in figure 2). On self-con-
tained 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
).
P
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.
EXTERNAL EQUALIZER
EVAPORATOR
REMOTE
BULB
EXPANSION
DISTRIBUTOR
VALVE
INCORRECT
REMOTE BULB LOCATION
SHOWN TRAPPED
AFA(E)
DIMENSIONAL DIAGRAMS & TABLE
EmersonClimate.com/FlowControls
Technical Support: 1-866-625-8416
PA-00235 (06/13) Emerson is a trademark of Emerson Electric Co. ©2013 Emerson Climate Technologies, Inc. All rights reserved.
AFA(E) NOMENCLATURE
E
1/2
External
Capacity
Equalizer
Nominal
(omit for
Rating in
internal)
Tons
).
T
EXTERNAL EQUALIZER
EVAPORATOR
EXPANSION
DISTRIBUTOR
VALVE
CORRECT
REMOTE BULB LOCATION
SHOWN FREE-DRAINING
FIGURE 1
H
C
Refrigerant
Charge
Code
Code
F = R12
C = med temp
H = R22
Z = low temp
R = R502
W = MOP (if needed)
SUPERHEAT ADJUSTMENT
Emerson thermal expansion valves are factory set to a spe-
cific 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 super-
heat and counterclockwise to decrease superheat. One
complete 360° turn changes the superheat approximately
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 fur-
ther turning adjustment will damage valve.
TEMP
40°
REMOTE
BULB
AFA(E) CONNECTIONS
TOLERANCE
INLET
OUTLET
1/4
elbow
3/8 – 1/2
3/8
elbow
3/8 – 1/2
3/8 x 1/2
SAE Connection
Size
–
TEMP
= SUPERHEAT
T
P
–
33°
=
7°
69 PSIG = 40°F
T
40°F
59 PSIG = 33°F
59 PSIG = 40°F
FIGURE 2
± 5/32
± 1/32
A
B
3/8
1/2
1-49/64
1-3/32
5/8
3/8
1/2
1-41/64
1-5/16
5/8
P
59 PSIG
± 3/64
C
1-41/64
1-23/64
1-63/64
1-47/64
1-41/64
1-23/64
1-63/64
1-47/64
Publicidad
