20
a
djuSt
r
efrIgerant
l
evel
Using service equipment, add or recover refrigerant according
to the calculation in Step 1. Allow system to stabilize for 20
minutes after adjusting charge level.
m
eaSure
S
uBcoolIng
to
v
erIfy
p
roper
c
harge
If want to adjust charging by checking “Subcooling”, please
follow below.
note:
Charging equipment must use dedicated PVE oil
gauges and hoses.
1. Purge gauge lines.
2. Connect service gauge manifold to liquid base valve
service ports.
3. Convert the liquid pressure to temperature using a
temperature/pressure chart.
4. Temporarily install a thermometer on the liquid line at
the liquid line service valve.
Ensure the thermometer makes adequate contact and
is insulated for best possible readings.
5. Subtract the liquid line temperature from the converted
liquid pressure to determine subcooling.
6. Before starting the subcooling adjustment, make sure
the outdoor ambient temperature is in a below range
and the unit is operating at 100% capacity.
If the unit is operating at 100% capacity which is ready
for charge by subcooling, seven segments will light up
as “cha”.
But, if the unit is not operating at 100% capacity which
is not ready for charging, seven segments will flush
as “cha”.
7. If the system subcooling is not within the range
as shown in the following table, adjust subcooling
according to the following procedure.
a. If subcooling is low, add charge to adjust the
subcooling as specified in the following table.
b. If subcooling is high, remove charge to lower the
subcooling to below charging table value.
SUBcoolinG = (SAt. liQUid teMP.) - (liQUid line
teMP.)
charging table
od Ambient
temp (degf)
< 65 °F
65°F to 105°F
> 105 °F
Subcooling
(degf)
Weigh in
Charge
3.5 T - 8 ±1°F
4.0 T - 9 ±1°F
5.0 T - 8 ±1°F
Weigh in
Charge
Note: Subcooling information is valid only while the unit is operating at
100% capacity or 100% of compressor speed in CHARGE MODE.
Compressor speed is displayed under STATUS menu in the thermostat.
note:
Not more than 3/8 lb. (6 oz.) of refrigerant be added
to the system at a time to achieve the target subcooling. It is
recommended adding 1 oz. refrigerant each time, then wait
10 minutes to stabilize the system.
c
heck
the
S
chrader
portS
for
leakS
and
tIghten
valve
coreS
,
If
neceSSary
. I
nStall
capS
fInger
-
tIght
.
notice
d
o
not
adjuSt
the
charge
BaSed
on
SuctIon
preSSure
.
notice
SAtUrAted liQUid
PreSSUre teMPerAtUre
cHArt
SAtUrAted liQUid
PreSSUre teMPerAtUre
cHArt
liQUid
PreSSUre
PSiG
r-410A
°f
liQUid
PreSSUre
PSiG
r-410A
°f
200
70
325
101
210
73
355
108
220
76
375
112
225
78
405
118
235
80
415
119
245
83
425
121
255
85
435
123
265
88
445
125
275
90
475
130
285
92
500
134
295
95
525
138
305
97
550
142
