Adjust Refrigerant Level; Measure Subcooling To Verify Proper Charge - Daikin DX17VSS181AA Installation Instructions Manual

s 5. a R
teP djust eFRigeRant
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.
s 6. m s
teP easuRe uBCooling to
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
< 65 °F
Temp (degF)
Subcooling Weigh in
(degF)
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.
l
evel
v P C
eRiFy RoPeR haRge
65°F to 105°F > 105 °F
1.5 T - 10 ±1°F
2.0 T - 12 ±1°F Weigh in
2.5 T - 10 ±1°F Charge
3.0 T - 10 ±1°F
NOTICE
C s
heCK the ChrAder ports for leAKs And tIghten vAlve Cores
. I
neCessAry nstAll CAps fInger
NOTICE
d not
o Adjust the ChArge bAsed on suCtIon pressure
SATURATED LIQUID
PRESSURE TEMPERATURE
CHART
LIQUID
R-410A
PRESSURE
°F
PSIG
200 70
210 73
220 76
225 78
235 80
245 83
255 85
265 88
275 90
285 92
295 95
305 97
20
- .
tIght
.
SATURATED LIQUID
PRESSURE TEMPERATURE
CHART
LIQUID
R-410A
PRESSURE
°F
PSIG
325 101
355 108
375 112
405 118
415 119
425 121
435 123
445 125
475 130
500 134
525 138
550 142
,
If