Carrier 58MVP - Manual (Page 47)

A95094
VARIABLE SPEED CONDENSING FURNACE ALGORITHM
Using
re
corded Low Heat (LH)
and High Heat (H
H) val
u
es,
calcu
la
te
the
Heat
Lo
ad (HL)
usin
g:
HL=(228 X LH) + (350 X HH
)
Is HL
< 36
48
?
Is HL
> 56
00
?
Is 5
6
0
0
> HL
> 3
648
?
Calculate Low Heat (LH) on
time will be
16
m
inutes.
Calculate Low Heat (LH) on
time will be
0 minutes.
Unit will initiate the next cycle in Lo
w Heat
for a
m
a
ximu
m
of
16
min. befor
e
initiati
ng High Heat if
th
e ca
ll f
o
r he
at st
ill e
xist
s.
Unit will initiate the next cycle
in High
Hea
t un
til the
th
ermo
stat
is satisfie
d.
Unit will iniate the next cycle in Lo
w Heat
to
the
ne
arest m
inu
te
fo
r a p
e
ri
od
of
t
ime
as ca
lcul
at
e
d
by
the
following
:
LH
= (56
00 - HL
)/
122
The next cycle will be initiated with
the calculat
ed Low
fire ru
n
time b
e
fo
re
initiat
in
g
h
igh
hea
t if
a
call for h
eat
is still
prese
n
t.
ru
n time
Is t
here
a ca
ll
fo
r he
at
?
The
Lo
w He
at and
High He
at
run
tim
e
s for
t
h
is cycle will be
as calculat
ed.
Ther
most
at is satisfied.
Ye
s
Ye
s
Ye
s
FEBRUARY 1995
47