21
75 (24) 82 (28) 85 (29) 95 (35) 105 (41)
Pressure
(psig)
5 10152025
Pressure
(kPa)
3681114
024 10.3 ( 5.7 ) 9.8 ( 5.4 ) 9.4 ( 5.2 ) 9 ( 5 ) 8.6 ( 4.7 ) 189 61 56 51 46 41 1303 16 13 11 8 5
030 9.3 ( 5.2 ) 8.8 ( 4.9 ) 8.6 ( 4.8 ) 7.8 ( 4.3 ) 7 ( 3.9 ) 196 63 58 53 48 43 1351 17 15 12 9 6
036 17.6 ( 9.8 ) 16.8 ( 9.3 ) 16.5 ( 9.2 ) 15.4 ( 8.6 ) 14.3 ( 7.9 ) 203 66 61 56 51 46 1399 19 16 13 10 8
042 12.8 ( 7.1 ) 12.7 ( 7.1 ) 12.7 ( 7.1 ) 12.6 ( 7 ) 12.6 ( 7 ) 210 68 63 58 53 48 1448 20 17 14 11 9
048 17.5 ( 9.7 ) 16.9 ( 9.4 ) 16.6 ( 9.2 ) 15.7 ( 8.7 ) 14.8 ( 8.2 ) 217 70 65 60 55 50 1496 21 18 15 13 10
060 13.7 ( 7.6 ) 13 ( 7.2 ) 13 ( 7.2 ) 14.5 ( 8.1 ) 11.5 ( 6.4 ) 224 72 67 62 57 52 1544 22 19 16 14 11
231 74 69 64 59 54 1593 23 20 18 15 12
238 76 71 66 61 56 1641 24 21 19 16 13
245 77 72 67 62 57 1689 25 22 20 17 14
252 79 74 69 64 59 1737 26 23 21 18 15
260 81 76 71 66 61 1792 27 25 22 19 16
268 83 78 73 68 63 1848 29 26 23 20 17
276 85 80 75 70 65 1903 30 27 24 21 19
284 87 82 77 72 67 1958 31 28 25 22 20
292 89 84 79 74 69 2013 32 29 26 23 21
300 91 86 81 76 71 2068 33 30 27 24 22
309 93 88 83 78 73 2130 34 31 28 26 23
318 95 90 85 80 75 2192 35 32 29 27 24
327 97 92 87 82 77 2254 36 33 31 28 25
336 99 94 89 84 79 2316 37 34 32 29 26
345 101 96 91 86 81 2378 38 35 33 30 27
354 103 98 93 88 83 2440 39 36 34 31 28
364 105 100 95 90 85 2509 40 38 35 32 29
374 107 102 97 92 87 2578 41 39 36 33 30
384 108 103 98 93 88 2647 42 40 37 34 31
394 110 105 100 95 90 2716 44 41 38 35 32
404 112 107 102 97 92 2785 45 42 39 36 33
414 114 109 104 99 94 2854 46 43 40 37 34
424 116 111 106 101 96 2923 47 44 41 38 35
434 118 113 108 103 98 2992 48 45 42 39 36
444 119 114 109 104 99 3061 48 46 43 40 37
454 121 116 111 106 101 3130 49 47 44 41 38
464 123 118 113 108 103 3199 50 48 45 42 39
474 124 119 114 109 104 3268 51 48 46 43 40
484 126 121 116 111 106 3337 52 49 47 44 41
494 127 122 117 112 107 3406 53 50 47 45 42
504 129 124 119 114 109 3475 54 51 48 46 43
514 131 126 121 116 111 3544 55 52 49 46 44
524 132 127 122 117 112 3612 56 53 50 47 45
534 134 129 124 119 114 3681 56 54 51 48 45
8- Add Charge if the measured temperature is higher than the table value.
5- Interpolate if the Outdoor ambient temperature lies in between the table
values. Extrapolate if the temperature lies beyond the table range.
2- Measure the Liquid line temperature by attaching a temperature sensing
device to it.
3- Insulate the temperature sensing device so that the Outdoor Ambient
doesn’t affect the reading.
4- Refer to the required Subcooling in the table based on the model size and
the Outdoor Ambient temperature.
Required Subcooling oF (oC)
Model Size
Outdoor Ambient Temperature
Charging Procedure
Required Liquid Line Temperature for a Specific Subcooling (R-410A)
Required Subcooling (
o
C)Required Subcooling (
o
F)
1- Measure Discharge line pressure by attaching a gauge to the service port.
50XZ500174
7- Read across from the Pressure reading to obtain the Liquid line
temperature for a required Subcooling
6- Find the Pressure Value in the table corresponding to the the measured
Pressure of the Compressor Discharge line.
C03027
Fig. 20 -- Cooling Charging Table--Subcooling
IMPORTANT: Three--phase, scroll compressor units are
direction--oriented. These units must be checked to ensure proper
compressor 3--phase power lead orientation. If not corrected
within 5 minutes, the internal protector shuts off the compressor.
The 3--phase power leads to the unit must be reversed to correct
rotation. When turning backwards, scroll compressors emit
elevated noise levels, and the difference between compressor
suction and discharge pressures may be dramatically lower than
normal.
CHECKING AND ADJ USTING REFRIGERANT
CHARGE
The refrigerant system is fully charged with R--410A refrigerant,
tested, and factory--sealed.
NOTE: Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper R--410A
charge.
An accurate superheat, thermocouple-- or thermistor--type
thermometer, a sling psychrometer, and a gauge manifold are
required when using the superheat charging method for
evaluating the unit charge. Do not use mercury or small dial--type
thermometers because they are not adequate for this type of
measurement.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
When evaluating the refrigerant charge, an indicated
adjustment to the specified factory charge must always be very
minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either coil or both coils.
!
CAUTION
To Use Cooling Charging Charts
Take the liquid line temperature and read the manifold pressure
gauges. Refer to the chart (See Fig. 20) to determine what the
liquid line temperature should be.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to the Check for Refrigerant Leaks section.
INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
For cooling operation, the recommended airflow is 350 to 450
cfm for each 12,000 Btuh of rated cooling capacity. For heating
operation, the airflow must produce a temperature rise that falls
within the range stamped on the unit rating plate. Table 4 shows
the temperature rise at various airflow rates. Table 7 & 8 show
cooling airflows and Table 9 & 10 show heating airflows at the
selection pin ranges (depending on external static pressure). Refer
to these tables to determine the airflow for the system being
installed.
NOTE: Be sure that all supply-- and return--air grilles are open,
free from obstructions, and adjusted properly.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before making any indoor wiring adjustments, shut off gas
supply. Then disconnect electrical power to the unit.
!
WARNING
Airflow can be changed by changing the selection pins on the
Easy Select circuit board.
48XP
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