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FAN LAW KEYS
Your calculator also has built-in formulas and keys that calculate Fan
Laws 1, 2 and 3, for air flow calculations. Each of these formulas
requires the entry of three variables in order to solve the fourth.
Ç R
Ç r
Ç d
Storage Registers Used For Fan Laws:
Ç 4
Ç 7
Ç 5
Ç 8
14 — S
M
HEET
ETAL
Fan Law 1 — Calculates the missing variable (e.g.,
"a-new" or "b-new" for CFM new or RPM new) for
Fan Law 1, given the three known variables into the
applicable Storage Registers (see below). See
page 75 for examples.
Fan Law 2 — Calculates the missing variable (e.g.,
"a-new" or "b-new" for CFM new or SP new) for Fan
Law 2, given the three known variables into the
applicable Storage Registers (see below). See
page 76 for examples.
Fan Law 3 — Calculates the missing variable (e.g.,
"a-new" or "b-new" for CFM new or BHP new) for
Fan Law 3, given the three known variables into the
applicable Storage Registers (see below). See
page 77 for examples.
Storage Register "a" — Enters "a-old" or current
"a" value.
Storage Register "a-new" — Enters "a-new" or
new "a" value.
Storage Register "b" — Enters "b-old" or current
"b" value.
Storage Register "b-new" — Enters "b-new" or
new "b" value.
/HVAC P
RO
C
ALC
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