Amana AVZC18 Installation & Service Reference page 15

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
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)
Weigh in
Subcooling
Charge
(degF)
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 recom-
mended adding 4 oz. refrigerant each time, then wait 20 minutes
to stabilize the system.
L
EVEL
V P C
ERIFY ROPER HARGE
65°F to 105°F
2 T - 11 ±1°F
3 T - 14 ±1°F
4 T - 9 ±1°F
5 T - 12 ±1°F
11±1 °F
14±1 °F
9±1 °F
12±1 °F
NOTICE
C
HECK THE
. I
NECESSARY
NOTICE
D NOT
O ADJUST THE CHARGE BASED ON SUCTION PRESSURE UNLESS
THERE IS A GROSS UNDERCHARGE
SATURATED
SUCTION PRESSURE
TEMPERATURE CHART
SUCTION
PRESSURE
PSIG
50
52
54
56
58
60
62
64
66
> 105 °F
68
70
72
Weigh in
74
Charge
76
78
80
85
90
95
100
110
120
130
140
150
160
170
H P
EAT UMP WITH
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/second-
ary heating to be turned on when outdoor temperature is much
higher than indoor temperature, compressor might stop operat-
ing under this circumstance.
15
S
CHRADER PORTS FOR LEAKS AND TIGHTEN VALVE CORES
- .
NSTALL CAPS FINGER TIGHT
.
TEMPERATURE CHART
R-410A
PRESSURE
°F
1
3
4
6
7
8
10
11
13
14
15
16
17
19
20
21
24
26
29
31
36
41
45
49
53
56
60
O T
UTDOOR EMPERATURE
,
IF
SATURATED
LIQUID PRESSURE
LIQUID
R-410A
°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
325 101
355 108
375 112
405 118
415 119
425 121
435 123
445 125
475 130
500 134
525 138
550 142
575 145
600 149
625 152
L
OCKOUTS