SS-SVX11K-EN
107
Preliminary Expansion Valve
Adjustment
N
NO
OT
TIIC
CE
E
C
Co
om
mp
prre
esssso
orr D
Da
am
ma
ag
ge
e!!
F
Fa
aiillu
urre
e tto
o ffo
ollllo
ow
w iin
nssttrru
uccttiio
on
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ou
ulld
d rre
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ulltt iin
n
cco
om
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aiillu
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e o
orr rre
ed
du
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ed
d cco
om
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orr lliiffe
e..
IIn
nccrre
ea
asse
e tth
he
errm
ma
all e
ex
xp
pa
an
nssiio
on
n v
va
allv
ve
e ssu
up
pe
errh
he
ea
att
sse
ettttiin
ng
gss b
be
effo
orre
e sstta
arrttiin
ng
g cco
om
mp
prre
esssso
orrss tto
o m
miin
niim
miizze
e
cco
om
mp
prre
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orr o
op
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erra
attiio
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n w
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h llo
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w o
oiill v
viisscco
ossiitty
y..
No bleed thermal expansion valves are set by
manufacturers to control between 12-14.4°F superheat
leaving the evaporator at nominal design conditions.
Thermal expansion valves with bleeds are set to their
highest superheat setting. Actual superheat depends
on many factors (valve vs. system relative sizing,
operating conditions, system load step, system charge,
piping, and condenser fan control). The thermal
expansion valves must be adjusted as part of the unit
start-up procedure. Do not adjust valves beyond
manufacturer's available nominal adjustment range.
N
No
otte
e:: In tables below, valve part numbers with “-ZGA”
in place of “-GA”, may be used interchangeably.
“ERZE-” part number valves are an acceptable
alternate to “BBIZE” valves.
Table 30.
Thermal expansion valve manufacturer settings - no bleed — Sporlan
Standard off the shelf nominal valve settings (90 PSIG air test setting)
Valve
Superheat,
°F
CW turns
available
CCW turns
available
Superheat
change per
turn
Field adjust
for 18°F (DX
evap coil)
Field adjust for
15°F (EVP only)
BBIZE-1-GA
12
4.5
4.5
2.4°F
2.5 CW
—
BBIZE-1-1/2-GA
BBIZE-2-GA
BBIZE-3-GA
BBIZE-4-GA
BBIZE-5-GA
BBIZE-6-GA
BBIZE-8-GA
BBIZE-12.5-GA
BBIZE-15-GA
OZE-20-GA
3.4°F
.25 CW
.25 CW
OZE-25-GA
OZE-35-GA
OZE-50-GA
7.5
1.8°F
3.25 CW
1.75 CW
OZE-60-GA
Table 31.
Thermal expansion valve manufacturer settings - no bleed — Emerson
Standard off the shelf nominal valve settings
Valve
Nom Tons
Super-
heat, °F
CW turns
available
CCW turns
available
Superheat
change per
turn
Field adjust
for 18°F (DX
evap coil)
Field adjust
for 15°F
(EVP only)
C
1-1/2 to 7
13
6
6
4
1.25 CW
TF
12 to 20
5
5
2
2.5 CW
1.0 CW
