Daikin DZ18VC Series Installation Instructions Manual page 37

Adjust Refrigerant Level
Using service equipment, add or recover refrigerant according
to the calculation. Allow system to stabilize for 20 minutes
after adjusting charge level.
Measure Subcooling to Verify Proper Charge
NOTE: Charging equipment must use dedicated PVE oil
gauges and hoses.
1. Purge gauge lines.
2. Connect service gauge manifold to 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.
a. 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.
SUBCOOLING = (SAT. LIQUID TEMP.) - (LIQUID LINE TEMP.)
Charging Table
OD Ambient Temp
< 65 °F
(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.
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:
2 T
3 T
4 T
5 T
NOTE: Not more than 8 oz. or 1/2 lb. of refrigerant be added
to the system at a time to achieve the target subcooling. It is
recommended adding 4 oz. refrigerant each time, then wait
20 minutes to stabilize the system.
65°F to 105°F > 105 °F
2 T - 11 ±1°F
3 T - 14 ±1°F Weigh in
4 T - 9 ±1°F Charge
5 T - 12 ±1°F
11±1°F
14±1°F
9±1°F
12±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 UNLESS
THERE IS A GROSS UNDERCHARGE
SATURATED
SUCTION PRESSURE
TEMPERATURE CHART
SUCTION
R-410A
PRESSURE
°F
PSIG
50
52
54
56
58
60
62 10
64 11
66 13
68 14
70 15
72 16
74 17
76 19
78 20
80 21
85 24
90 26
95 29
100 31
110 36
120 41
130 45
140 49
150 53
160 56
170 60
Heat Pump with Outdoor Temperature Lockouts
It is recommended to set the outdoor temperature lockouts
during the initial thermostat set up. Compressor lockout
temperature will enable the compressor to be turned off and
switch heating source from refrigeration to auxiliary/secondary
heating under low outdoor ambient conditions.
Backup heat lockout temperature will enable auxiliary/sec-
ondary heating to be turned on when outdoor temperature is
much higher than indoor temperature, compressor might stop
operating under this circumstance.
37
- .
TIGHT
.
SATURATED
LIQUID PRESSURE
TEMPERATURE CHART
LIQUID
PRESSURE
PSIG
1 200
3 210
4 220
6 225
7 235
8 245
255
265
275
285
295
305
325
355
375
405
415
425
435
445
475
500
525
550
575
600
625
,
IF
R-410A
°F
70
73
76
78
80
83
85
88
90
92
95
97
101
108
112
118
119
121
123
125
130
134
138
142
145
149
152