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Table 3. HFC-410A Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
TSA*H4
-036
5F (5C)*
Liquid / Suction
Expansion Valve (TXV)
65 (18)
263 / 135
70 (21)
281 / 138
75 (24)
302 / 140
80 (27)
325 / 142
85 (29)
349 / 142
90 (32)
375 / 143
95 (35)
404 / 144
100 (38)
433 / 145
105 (41)
462 / 147
110 (43)
494 / 149
115 (45)
527 / 150
°F
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
Maintenance
DEALER
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
Outdoor Unit
1. Outdoor unit fan motor is pre-lubricated and sealed.
No further lubrication is needed.
2. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
3. Check all wiring for loose connections.
4. Check for correct voltage at unit (unit operating).
5. Check amp draw on outdoor fan motor.
506 11/2012
Use this table to perform maintenance checks; it is not a procedure for charging the
system. Minor variations in these pressures may be due to differences in installations.
Significant deviations could mean that the system is not properly charged or that a
problem exists with some component in the system.
-042
Liquid / Suction
238 /132
262 / 133
280 / 134
301 / 136
327 / 137
353 / 138
377 / 140
404 / 141
435 / 142
465 / 143
499 / 144
Table 4. HFC-410A Temperature (°F) - Pressure (Psig)
°C
Psig
-40.0
11.6
-37.2
14.9
-34.4
18.5
-31.7
22.5
-28.9
26.9
-26.1
31.7
-23.3
36.8
-20.6
42.5
-17.8
48.6
-15.0
55.2
-12.2
62.3
-9.4
70.0
-6.7
78.3
-3.9
87.3
-1.1
96.8
1.7
107
4.4
118
7.2
130
10.0
142
12.8
155
-048
Liquid / Suction
235 / 132
254 / 132
276 / 134
298 / 134
323 / 135
350 / 137
377 / 138
406 / 140
430 / 141
464 / 142
495 / 143
°F
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
Motor Nameplate:_________ Actual:__________.
6. Inspect drain holes in coil compartment base and
clean if necessary.
NOTE ‐ If insufficient cooling occurs, the unit should be
gauged and refrigerant charge should be checked.
Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
NOTE — It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may
contain high levels of corrosive chemicals such as salts)
Page 18
-060
Liquid / Suction
241 / 130
260 / 130
280 / 132
299 / 134
321 / 135
344 / 134
371 / 135
400 / 137
428 / 139
458 / 141
484 / 142
°C
Psig
15.6
170
18.3
185
21.1
201
23.9
217
26.7
235
29.4
254
32.2
274
35.0
295
37.8
317
40.6
340
43.3
365
46.1
391
48.9
418
51.7
446
54.4
476
57.2
507
60.0
539
62.8
573
65.6
608
Outdoor Coil
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