Cooling Chart; Capacity Request Calculations - Lennox MCB Series Service Manual

5.6.

Cooling Chart

°F(°C) ODU(DB)
IDU(DB/WB)
70/59 (21.11/15)
75/63
(23.89/17.22)
PSI
80/67
(26.67/19.44)
90/73
(32.22/22.78)
5.7.

Capacity Request Calculations

Total capacity Request=Σ(Norm code × HP) /10× modify rate+ correction.
Capacity Area
Norm Code (N)
NOTE:
The final result is integer.
Plus all the indoor capacity request together, then modify it by T4.
When there is only one indoor unit:
Table 1.
0 5 15
(-17) (-15) (9.44)
93 94 106
97 99 115
103 104 123
112 113 139
T1 Ts
3
2
1
0
1
Figure 13. Cooling Mode
a b c d
3 2 1.5 1
Cooling - Fahrenheit (Celsius)
45 75
(7.22) (23.89) (29.44)
116 119
125 124
138 135
152 149
a
b
c
d
e
f
e
.5
22
85 95 105
(35) (40.56)
113 117 125
120 126 132
129 132 140
138 145 154
4
3
2
1
0
f
0
115 120
(46.11) (48.89)
147 154
155 162
162 173
180 189