Johnson Controls (H, Engineering Manual

Page: 123 / 124

SELECTION DATA
TC-16006
4-19
4.4 Correction Factor According to Defrosting Operation
The heating capacity in the preceding paragraph does not include defrost operation periods.
Therefore, capacity should be corrected as follows:
Corrected Heating Capacity = Correction Factor x Heating Capacity
NOTE:
The correction factor is not available for special conditions like snowfall or operation in a transitional period.
Outdoor Air Temp.
o
F DB (
o
C DB)
(Humidity=85% RH)
19
(-7.2)
23
(-5.0)
27
(-2.8)
31
(-0.6)
35
(1.7)
39
(3.9)
41
(5.0)
43
(6.1)
45
(7.2)
47
(8.3)
Correction Factor 0.95 0.93 0.89 0.87 0.88 0.90 0.92 0.96 1.0 1.0
Altitude
ft 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
(m) (0) (305) (610) (914) (1219) (1524) (1829) (2133) (2438) (2743) (3048)
Correction Factor 1.00 0.97 0.93 0.90 0.87 0.83 0.80 0.77 0.75 0.72 0.69
4.5 Correction Factor According to Altitude
The capacity is affected by the altitude.
Corrected Capacity = Correction Factor x Capacity