NCP NCHP-018, Installation Instructions Manual, Page: 6 / 16

6
Fixed Orifice Fed Indoor Coil Charging by Superheat Table - Cooling Mode Only
&
R/H
65 76 16 8 5 5 5 5 5 5 5 5 5
70 57 17 9 5 5 5 5 5 5 5 5 5
80 30 19 12 8 5 5 5 5 5 5 5 5
85 21 21 14 10 6 5 5 5 5 5 5 5
65 85 13 9 5 5 5 5 5 5 5 5 5
70 64 16 12 8 5 5 5 5 5 5 5 5
85 26 20 17 13 10 6 5 5 5 5 5 5
115 95 100 105 110 75 80 85 90
Indoor Outdoor Ambient
WB DB 65 70
76
78
80
68
70
72
74
60
62
64
66
75 49 18 15 11 7 5 5 5 5 5 5 5
70 72 23 19 15 12 8 5 5 5 5 5 5
75 41 18 10 6 5 5 5 5 5 5 5 5
80 36 19 15 12 8 5 5 5 5 5 5 5
75 56 24 21 17 14 10 7 5 5 5 5 5
80 42 25 22 19 16 13 9 6 5 5 5 5
85 31 26 23 20 17 13 10 7 5 5 5 5
70 81 26 22 19 15 12 9 5 5 5 5 5
75 63 26 23 20 16 13 13 10 7 5 5 5
80 48 29 26 23 20 17 14 11 8 5 5 5
90 28 30 27 24 21 18 15 12 9 5 5 5
75 70 30 26 23 20 17 14 11 8 5 5 5
80 54 31 28 25 23 20 17 14 12 9 6 5
85 42 32 30 27 24 21 18 15 13 10 7 5
90 32 33 31 28 25 22 19 17 14 11 8 5
75 79 33 30 27 24 21 19 16 13 10 7 5
80 62 33 31 28 26 23 21 18 16 13 11 8
85 48 36 33 30 28 25 23 20 18 15 13 10
90 38 37 34 32 29 27 24 21 19 16 14 11
75 88 36 33 31 28 26 23 20 18 15 13 10
80 68 36 34 31 29 27 24 22 20 17 15 13
85 54 38 35 33 30 28 25 23 21 18 16 13
90 42 38 35 33 30 29 26 24 21 19 17 14
95 33 38 35 33 31 29 27 24 22 20 18 15
75 96 39 36 34 32 29 27 25 22 20 18 15
80 76 39 37 35 32 30 28 26 24 22 19 18
85 60 39 37 35 33 31 29 26 24 22 20 18
90 48 40 38 35 33 31 29 26 24 22 20 18
95 38 40 38 36 33 31 29 27 25 22 20 18
80 84 42 40 38 36 34 32 30 28 27 25 23
85 67 42 41 39 37 35 33 31 29 27 25 23
90 54 44 42 40 38 36 34 32 31 29 27 25
95 43 45 43 41 40 38 36 34 32 31 29 27
80 92
44 43 41 39 38 36 34 33 31 29 27
85 74 45 43 41 40 38 36 34 33 31 30 28
90 59 47 45 44 42 41 39 37 36 34 33 31
95 48 49 47 46 45 43 42 41 39 37 36 35
85 80 47 46 44 43 41 40 39 37 36 34 33
90 65 48 47 46 44 43 41 40 39 37 36 34
95 53 50 49 47 46 44 43 41 40 39 37 36
90 24 27 24 21 18 14 11 8 5 5 5 5
85 36 29 26 23 20 17 14 11 8 5 5 5
70 90 29 26 23 9 16 13 10 7 5 5 5
White area of the chart is optimum for charging
For coils equipped with TXV’s charge to sub-cooling or 8 to 12°
Notes:
All information based on 400 CFM/Ton
Recommended minimum superheat is 5°F
Superheat temperature measurements should be taken within 3 feet of the compressor suction line connection
R/H - Approximate % of indoor relative humidity
WB - Indoor wet bulb temperture °F
DB - Indoor dry bulb temperature °F
*** When checking superheat at extreme high temperature, charge to minimum of 5° of super heat
and re-check when temperature falls back into the white area of chart.