Step 4—Outdoor Fan
Keep the condenser fan free from all obstructions to ensure
proper cooling operation. Never place articles on top of the
unit. Damage to unit may result.
1. Remove 6 screws holding outdoor grille and motor to top
cover.
2. Turn motor/grille assembly upside down on top cover to
expose fan blade.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen setscrew and slide fan off
motor shaft.
5. When replacing fan blade, position blade so that the hub is 1/8
in. away from the motor end (1/8 in. of motor shaft will be
visible). (See Fig. 23)
6. Ensure that setscrew engages the flat area on the motor shaft
when tightening.
7. Replace grille.
Step 5—Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove access panel to locate all the electrical controls and
wiring. Check all electrical connections for tightness. Tighten all
screw connections. If any smoky or burned connections are
noticed, disassemble the connection, clean all the parts, restrip the
wire end and reassemble the connection properly and securely.
After inspecting the electrical controls and wiring, replace all the
panels. Start the unit, and observe at least one complete cooling
cycle to ensure proper operation. If discrepancies are observed in
operating cycle, or if a suspected malfunction has occurred, check
each electrical component with the proper electrical instrumenta-
tion. Refer to the unit wiring label when making these checkouts.
Step 6—Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a refrig-
erant leak.
If oil is detected or if low performance is suspected, leak-test all
refrigerant tubing using an electronic leak detector, or liquid-soap
solution. If a refrigerant leak is detected, refer to Check for
Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is suspected,
refer to Checking and Adjusting Refrigerant Charge section.
Step 7—Indoor Airflow
The heating and/or cooling airflow does not require checking
unless improper performance is suspected. If a problem exists, be
sure that all supply- and return-air grilles are open and free from
obstructions, and that the air filter is clean. When necessary, refer
to Indoor Airflow and Airflow Adjustments section to check the
system airflow.
Step 8—Metering Devices–TXV & Accurater Piston
This unit uses 2 types of metering devices. The outdoor metering
device is a fixed orifice and is contained in the brass hex-body in
the liquid line feeding the outdoor coils. The indoor metering
device is a TXV type device.
Fig. 27—Cooling Charging Table-Subcooling
C03027
(psig)
5 101520
(kPa)
36811
189 61 56 51 46 1303 13 13 11 8
203 66 61 56 51 1399 13 16 13 10
10.3 (5.7) 9.8 (5.4) 9.4 (5.2) 9 (5) 8.6 (4.7)
210 68 63 58 53 1448 13 17 14 11
NA NA NA NA NA
217 70 65 60 55 1496 13 18 15 13
17.6 (9.8) 16.8 (9.3) 16.5 (9.2) 15.4 (8.6) 14.3 (7.9)
224 72 67 62 57 1544 13 19 16 14
NA NA NA NA NA
231 74 69 64 59 1593 13 20 18 15
17.5 (9.7) 16.9 (9.4) 16.6 (9.2) 15.7 (8.7) 14.8 (8.2)
238 76 71 66 61 1641 13 21 19 16
13.7 (7.6) 13 (7.2) 13 (7.2) 14.5 (8.1) 11.5 (6.4)
245 77 72 67 62 1689 13 22 20 17
252 79 74 69 64 1737 13 23 21 18
260 81 76 71 66 1792 13 25 22 19
268 83 78 73 68 1848 13 26 23 20
276 85 80 75 70 1903 13 27 24 21
284 87 82 77 72 1958 13 28 25 22
292 89 84 79 74 2013 13 29 26 23
300 91 86 81 76 2068 13 30 27 24
309 93 88 83 78 2130 13 31 28 26
318 95 90 85 80 2192 13 32 29 27
327 97 92 87 82 2254 13 33 31 28
336 99 94 89 84 2316 13 34 32 29
345 101 96 91 86 2378 13 35 33 30
354 103 98 93 88 2440 13 36 34 31
364 105 100 95 90 2509 13 38 35 32
374 107 102 97 92 2578 13 39 36 33
384 108 103 98 93 2647 13 40 37 34
394 110 105 100 95 2716 13 41 38 35
404 112 107 102 97 2785 13 42 39 36
414 114 109 104 99 2854 13 43 40 37
424 116 111 106 101 2923 13 44 41 38
434 118 113 108 103 2992 13 45 42 39
444 119 114 109 104 3061 13 46 43 40
454 121 116 111 106 3130 13 47 44 41
464 123 118 113 108 3199 13 48 45 42
474 124 119 114 109 3268 13 48 46 43
484 126 121 116 111 3337 13 49 47 44
494 127 122 117 112 3406 13 50 47 45
504 129 124 119 114 3475 13 51 48 46
514 131 126 121 116 3544 13 52 49 46
524 132 127 122 117 3612 13 53 50 47
534 134 129 124 119 3681 13 54 51 48
Required Liquid Line Temperature for
Required Subcooling Deg F (Deg C)
Model Size
a Specific Subcooling (R-410A)
Charging Procedure
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.
5- Interpolate if the Outdoor ambient temperature lies in between the table values.
Extrapolate if the temperature lies beyond the table range.
1- Measure Discharge line pressure by attaching a gauge to the service port.
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.
8- Add Charge if the measured temperature is higher than the table value.
9- Add Charge using the service connection on the Suction line of the Compressor.
024
030
036
042
048
060
Outdoor Ambient Temperature
75 (24) 82 (28) 85 (29) 95 (35) 105 (41)
Pressure
Pressure
196
1351
Required Subcooling (Deg F) Required Subcooling (Deg C)
63 58
53 48 13
15 12
9
24
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