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b. Inspect for oil at all refrigerant tubing connections and on
unit base. Detecting oil generally indicates a refrigerant
leak. Leak-test all refrigerant tubing connections using
electronic leak detector, or liquid-soap solution. If a refrig-
erant leak is detected, see following Check for Refrigerant
Leaks section.
c. Inspect all field- and factory-wiring connections. Be sure
that connections are completed and tight. Ensure wires do
not contact refrigerant tubing or sheet metal edges.
d. Inspect coil fins. If damaged during shipping and handling,
carefully straighten fins with a fin comb.
3. Verify the following conditions:
a. Make sure that outdoor-fan blade is correctly positioned in
fan orifice. Top edge of blade should be 3.125 in. down
from outdoor coil outlet grille (size 024–048, See Fig. 12)
or hub should be 0.708-in. away from motor end bell (size
060, See Fig. 13). See Outdoor Fan Adjustment section.
b. Make sure that air filter is in place.
c. Make sure that condensate drain trap is filled with water to
ensure proper drainage.
d. Make sure that all tools and miscellaneous loose parts have
been removed.
Table 4—Required Subcooling
REQUIRED SUBCOOLING °F (°C)
Model Size
Outdoor Ambient Temperature
75 (24) 82 (28) 85 (29) 95 (35) 105 (41)
048 17.5 (9.7) 17 (9.4) 16.5 (9.2) 16 8.9) 14 (7.8)
060 21 (11.7) 20.5 (11.4) 20 (11.1) 19 (10.6) 16 (8.9)
Table 5—Required Liquid Line Temperature
REQUIRED LIQUID LINE TEMPERATURE FOR A SPECIFIC SUBCOOLING (R-22)
Pressure (psig)
Required Subcooling (°F)
Pressure (kPa)
Required Subcooling (°C)
5 101520 36811
134 71 66 61 56 924 24 22 19 16
141 74 69 64 59 972 26 23 21 18
156 80 75 70 65 1075 30 27 24 21
163 83 78 73 68 1124 31 28 26 23
170 86 81 76 71 1172 33 30 27 24
177 89 84 79 74 1220 34 31 29 26
184 91 86 81 76 1268 36 33 30 27
191 94 89 84 79 1317 37 34 31 29
198 96 91 86 81 1365 38 36 33 30
205 98 93 88 83 1413 40 37 34 31
213 101 96 91 86 1468 41 38 36 33
221 104 99 94 89 1524 43 40 37 34
229 106 101 96 91 1579 44 41 38 36
237 108 103 98 93 1634 45 42 40 37
245 111 106 101 96 1689 47 44 41 38
253 113 108 103 98 1744 48 45 42 40
262 116 111 106 101 1806 49 46 44 41
271 118 113 108 103 1868 51 48 45 42
280 121 116 111 106 1930 52 49 46 44
289 123 118 113 108 1992 53 51 48 45
298 125 120 115 110 2054 55 52 49 46
307 128 123 118 113 2116 56 53 50 48
317 130 125 120 115 2185 57 54 52 49
327 132 127 122 117 2254 59 56 53 50
337 135 130 125 120 2323 60 57 54 52
347 137 132 127 122 2392 61 58 56 53
357 139 134 129 124 2461 62 60 57 54
367 142 137 132 127 2530 64 61 58 55
280 121 116 111 106 1930 52 49 46 44
289 123 118 113 108 1992 53 51 48 45
298 125 120 115 110 2054 55 52 49 46
307 128 123 118 113 2116 56 53 50 48
317 130 125 120 115 2185 57 54 52 49
327 132 127 122 117 2254 59 56 53 50
337 135 130 125 120 2323 60 57 54 52
347 137 132 127 122 2392 61 58 56 53
357 139 134 129 124 2461 62 60 57 54
367 142 137 132 127 2530 64 61 58 55
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