Carrier Infinity 26VNA1 Installation Instructions Manual page 11

26VNA1 Infinity® Variable Speed Air Conditioner: Installation Instructions
8. The next screen, "cooling charge mode start" is shown in
Fig. 19 depending on whether subcooling charging is available. The
reason for unavailability of subcooling can be viewed by pressing
the down arrow to go to the second page. Before selecting "Start",
verify that the service valves are open. Pressing start will turn on
the system at a fixed set of operating parameters in COOLING
mode.
Fig. 18 – Cooling Charge Mode Start Screen - Subcooling Available
Fig. 19 – Cooling Charge Mode Start Screen - Subcooling
Unavailable
9. Once start has been pressed, the next screen will show the target
subcooling that should be attained while charging. If subcooling
mode is not available, the current subcooling and target will display
as dashes and the refrigerant must be weighed in. Weigh in the
charge amount recorded in Step 7. The charge level may then be
checked at another time when both the indoor and outdoor
temperatures are in a more favorable range that allow for
subcooling charging.
When subcooling is available, the current subcooling will appear in
red (Fig. 20) until the stabilization timer is 0 where it will then turn
green, indicating the system has stabilized. "Current subcooling" is
calculated using sensors inside the ODU, but may be in error until
stabilization time has completed. Compare the "current subcooling"
to the "subcooling target" listed on the charging screen. Add
refrigerant if the subcooling is low and remove refrigerant if
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 18 or subcooling is high. Tolerance should be ±1°F. It is recommended to
validate the subcooling using traditional methods of measuring
temperature and pressure at the liquid service valve when charging
the system.Refer to
temperature for a given subcooling and liquid service valve
pressure.
Fig. 20 – Cooling Charge Mode Run Screen
A240373
Table 4 – Required Liquid Line Temperature for R-454B
Liquid
(PSIG)
Pressure
6
at Service
Valve
238 78
245 80
252 82
260 84
268 86
276 88
284 90
292 92
301 94
309 96
318 98
327 100
336 102
346 104
355 106
365 108
375 110
385 112
396 114
406 116
417 118
428 120
439 122
450 124
A240385
10. If any adjustment is necessary, add or remove the charge slowly (no
greater than 0.5 lb per minute) and allow system to operate for at
least 15 minutes to stabilize before declaring a properly charged
system. The use of a commercial charge metering device (restrictor)
such as Imperial liquid low side charger model 535-C or Watsco
ChargeFaster model CH200 is recommended when adding
refrigerant to an operating system. This prevents potential damage
of liquid slugging of the compressor and allows the subcooling to
stabilize quicker.
11. If the lineset is less than 15 ft. (4.57 m) in length, charge removal
may be necessary and will be shown as a negative number on
Infinity® System Control screen. Note that the Infinity® System
Control screen displays charge in lb and oz, while unit rating plate
is in decimal format.
11
Table 4 for guidance on required liquid line
R-454B Subcooling Temperature (F)
8 10 12
76 74 72
78 76 74
80 78 76
82 80 78
84 82 80
86 84 82
88 86 84
90 88 86
92 90 88
94 92 90
96 94 92
98 96 94
100 98 96
102 100 98
104 102 100
106 104 102 100
108 106 104 102
110 108 106 104
112 110 108 106
114 112 110 108
116 114 112
118 116 114
120 118 116
122 120 118
A240375
14 16
70 68
72 70
74 72
76 74
78 76
80 78
82 80
84 82
86 84
88 86
90 88
92 90
94 92
96 94
98 96
98
100
102
104
106
110 108
112 110
114 112
116 114