ICP N4H3 - Page 16

C. HEATINGMODE
To check system operation during heating cycle, refer to
the Tech Label on outdoor unit. This chart indicates
whether a correct relationship exists between system
operating pressure and air temperature entering indoor
and outdoor units. If pressure and temperature do not
match on chart, system refrigerant charge may not be
correct. Do not use chart to adjust refrigerant charge.
NOTE: When charging is necessary during heating
season, charge must be weighed in accordance with unit
rating plate +0.6 ounces per foot of 3/8 inch liquid line
above or below 15 feet respectively (+17g per 305mm of
10mm liquid line above or below 4.6m respectively).
Figure 14 Superheat Charging - Heat Pump Only
EVAPORATOR ENTERING AIR TEMPERATURE (°F WB)
OUTDOOR TEMP (oF) 50 52 54 56 58 60 62 64 67 68 70 72 74 76
55 11 11 12 12 12 13 17 20 24 24 25 25 25 25
60 6 6 7 7 7 7 12 16 21 22 23 23 23 23
65 .... 3 7 12 18 19 21 21 22 22
70 ..... 7 14 16 18 20 20 20
75 ..... 3 11 13 16 18 18 19
82 ...... "6 8 12 15 16 17
85 ...... 4 7 11 14 15 16
90 ....... 4 8 12 14 15
95 ........ 6 10 12 14
100 ........ 4 8 11 12
105 ........ 3 6 9 11
110 ........ 5 7 10
115 ........ 3 6 8
*Optimum performance point, 82°F (28°C) outdoor ambient and (80°F / 27°C dry bulb), (67°F / 19°C wet bulb) indoor conditions. (DOE B Test Conditions)
Where a dash (--) appears do not attempt to charge system under these conditions or refrigerant slugging may occur. Charge must be weighed in.
Note: Superheat °F is at low-side service port, Allow a tolerance of + 3°F (+ 1.7°C)
Note: Indoor dry bulb between 70°F and 80°F (21°C and 27°C)
Figure 15
SUPERHEATTEMP (°F)
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
107,8
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
112,2
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
Required Suction-Line Temperature
SUCTION PRESSURE AT SERVICE PORT (PSIG)
116,8
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
121,2 126 130,8
41 43 45
43 45 47
45 47 49
47 49 51
49 51 53
51 53 55
53 55 57
55 57 59
57 59 61
59 61 63
61 63 65
63 65 67
65 67 69
67 69 71
69 71 73
71 73 75
138,8
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
140,8
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
145,8
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
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