Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28 - Manual (Page 56)

56
Fig.
4
5
—
T
y
p
ic
a
l
Compone
nt
Ar
ra
ng
e
m
e
n
t
—
4
8
PG
2
8
TH
E
R
M
OS
T
A
T
/IGC
M
AR
K
INGS
BM
—
Blo
w
e
r
M
oto
r
C—
Co
m
m
o
n
CM
—
Ind
u
cer
M
otor
CS
—
Ce
n
tr
ifu
g
a
l
S
witch
G—
Fa
n
IF
O
—
Ind
oor
F
a
n
O
n
L1
—
Li
ne
1
R—
Th
er
mo
stat
P
o
w
e
r
RT
—
P
o
w
e
r
S
upp
ly
SS
—
S
peed
S
e
nsor
W—
Th
er
mo
stat
H
e
a
t
W1
—
1st
S
tag
e
of
H
e
ati
n
g
W2
—
2nd
S
tage
o
f
H
eati
n
g
X—
A
lar
m
O
utput
Y1
—
1st
S
tag
e
of
C
o
ol
in
g
Y2
—
2nd
S
tage
o
f
C
ool
in
g
LEG
E
ND
FO
R
F
IG
.
4
2-45
---A
—
Cir
cu
it
A
AU
X
—
A
u
xilia
ry
Co
n
ta
c
t
AL
—
A
m
bi
en
t
L
im
it
---B
—
Cir
cu
it
B
C—
C
o
m
p
resso
r
C
ont
actor
CAP
—
C
apa
ci
tor
CB
—
Co
m
p
re
sso
r
Cir
cu
it
B
re
a
k
e
r
CCH
—
Cr
ankca
se
Heate
r
CL
O
—
C
o
m
p
resso
r
Loc
kout
COM
P
—
Com
p
re
sso
r
CT
BR
K
—
Cir
cu
it
B
re
a
k
e
r
CR
—
C
ont
rol
R
el
a
y
DU
—
D
u
mmy
T
e
rm
in
a
l
ECB
—
E
c
onom
iz
e
r
C
ont
rol
B
oar
d
FC
S
—
F
a
n
C
yc
lin
g
S
w
itch
F
IOP
—
F
a
cto
ry-
Installed
O
ption
FP
T
—
F
ree
ze
P
rotecti
on
The
rmosta
t
FS
—
Fl
am
e
S
e
n
s
or
FU
—
Fu
s
e
GND
—
Gr
ound
GV
—
Gas
V
alv
e
HA
CR
—
H
eat
in
g,
A
ir
C
ond
it
ioni
ng,
and
R
e
fri
ger
ati
o
n
HERM
—
He
rm
e
tic
HPS
—
Hig
h
-P
re
ssu
re
S
witch
I—
Ign
itor
IA
Q
—
Ind
oor
A
ir
Q
u
a
lity
IDM
—
In
du
c
e
d
-D
raf
t
M
ot
o
r
IDR
—
Ind
u
ced
D
ra
ft
Rela
y
IF
C
—
Ind
oor-
F
an
C
o
n
tactor
IF
CB
—
Ind
oor
F
a
n
C
ir
cui
t
B
reak
er
IF
M
—
Ind
oor-
F
an
M
otor
IGC
—
Inte
gr
at
ed
Gas
C
ontro
lle
r
LO
R
—
Loc
k
out
R
e
la
y
NO
T
E
S:
1.
F
a
ctor
y
w
ir
in
g
is
in
a
ccor
dance
w
it
h
the
N
a
ti
ona
l
E
le
ctri
cal
C
odes
.
A
n
y
fi
el
d
m
od
if
ic
ati
ons
or
addi
ti
on
s
m
ust
b
e
in
c
om
pl
iance
w
it
h
a
ll
appl
ic
ab
le
code
s.
2.
U
s
e
75°
C
m
in
w
ir
e
for
fi
el
d
p
o
w
er
su
ppl
y.
U
s
e
c
o
pper
w
ir
es
fo
r
a
ll
uni
ts
.
3.
A
ll
c
ir
cui
t
brea
k
e
rs
“M
ust
T
ri
p
A
m
p
s”
a
re
e
qual
to
or
le
s
s
than
1
5
6
%
RL
A.
4.
C
o
mpre
ssor
a
n
d
fa
n
m
otor
s
a
re
th
er
mal
ly
pr
otecte
d.
Thr
ee-
phase
m
otor
s
pr
otected
agai
n
s
t
p
ri
mar
y
si
ngl
e
-pha
se
cond
it
io
ns
.
5.
T
h
e
C
LO
lo
c
k
s
out
the
c
ompr
essor
to
p
re
v
e
n
t
shor
t
cycl
in
g
o
n
c
ompr
essor
o
v
erl
oad
and
saf
e
ty
de
vi
ces
.
B
e
fo
re
repl
aci
n
g
C
L
O
,
c
hec
k
these
d
e
v
ic
e
s
.
LP
S
—
L
o
w-
P
re
ssu
re
S
witch
LS
—
L
im
it
S
witch
OA
S
—
Out
door
-A
ir
S
ensor
OF
C
—
Out
door
-F
an
C
o
ntactor
OF
M
—
Out
door
-F
an
M
otor
PEC
—
P
o
w
e
r
E
xhau
st
C
onta
c
tor
PEM
—
P
o
w
e
r
E
xhau
st
M
ot
or
PL
—
Plu
g
PL
P
—
P
hase
Loss
P
rote
cti
o
n
QC
—
Q
ui
c
k
C
o
nnect
QT
—
Q
ua
drupl
e
T
er
mi
na
l
RAS
—
R
e
tu
rn
A
ir
S
ensor
RS
—
Ro
llo
u
t
S
witch
SA
T
—
S
uppl
y-
A
ir
T
em
per
atu
re
TB
—
Te
rm
in
a
l
B
lo
c
k
T
RAN
—
T
ra
n
sf
or
m
e
r
TX
V
—
T
her
m
o
stati
c
E
x
pan
si
o
n
V
a
lv
e
W/
A
T
—
With
A
u
xil
ia
ry
T
ri
p
Te
rm
in
a
l
B
lo
c
k
T
e
rm
in
a
l
(U
nm
ar
k
e
d)
Te
rm
in
a
l
(M
ar
ke
d)
F
a
cto
ry
W
ir
in
g
F
ie
ld
W
ir
in
g
T
o
Indi
ca
te
C
o
m
m
on
P
o
tenti
a
l
On
ly
.
N
o
t
to
Re
p
re
s
e
n
t
W
ir
in
g
.
T
o
Indica
te
F
IOP
o
r
A
ccessor
y