Carrier 48MA User Manual
Page 8
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The outdoor air load with respect to room condi-
as follows:
outdoor ail
total heat (OATH) = 4 5 (hgg:,- Ьго,ошХ (OA cfm)
= 4.5 (38.61 - 28.29) (1000)
= 46,440 Btuh
Or, a graph, shown 'in Fig. 6, can be used to find
the OA load factor, 4.5 (hoa “ hfoom). for all
conditions illustrated in the 48MA/50ME rating
tables (Performance Rating Section). Thus,
OATH = (OA load factor) (OA cfm)
= (46.5) (1000)
= 46,500 Btuh
which agrees with the above calculation.
Outdoor air
sensible heat (OASH) = 1.09 (toa ■" boom) (OA cfm)
= 1.09(95 - 75) (1000)
= 21,800 Btuh
<
О
2
u.
0
\
1
z>
H
Ш
Q
<
о
<
I-
o
h-
Ш
a
CO
I-
Э
о
OA WET BULB
Fig. 6 — Outdoor Air Load Selection Chart
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