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4
4
4
3
3
3
2
2
2
MM
MM
MM
1
1
1
B1
B1
B1
B2
B2
B2
A1
A1
A1
A2
A2
A2
CONTROL BOX
CONTROL BOX
CONTROL BOX
4
4
4
MM
MM
MM
3
3
3
A1
A1
A2
A2
2
2
MM
MM
1
1
B1
B1
B2
B2
CONTROL BOX
CONTROL BOX
M.M. = YES OR NO
LEGEND
MM
— Motormaster
OAT
— Outdoor Air Temperature
OFC
— Outdoor Fan Contactor
OFM
— Outdoor Fan Motor
SCT
— Saturated Condensing Temperature
Size 050, 055, 060
Controlling Output
Circuit
S
f o
w t
a
e r
Common
CONDFAN1
MBB Rly 6
Common
CONDFAN2
MBB Rly 5
Common
CONDFAN3
RCB Rly 1
M.M. = NO
# of Fans ON
S
a t
g
e
1
O
F
C
1
1
S
a t
g
e
2
O
F
C
2
2
S
a t
g
e
3
O
F
C
1
2 ,
3
O
S
a t
g
e
4
O
F
C
1
2 ,
3 ,
4
O
Low Ambient Prestart 1 (OAT ≤
5
0
°F
)
=
S
a t
g
e
L
o
w
A
m
b
e i
t n
P
e r
s
a t
t r
2
5 (
0
°F
<
O
A
T
<
7
0
°F
)
=
High Ambient Prestart (OAT ≥
7
0
°F
)
=
S
a t
g
e
4
A
o l l
w
F
a
n
S
a t
g
n i
g
f i
O
A
T
<
7
0
°F
CIRCUIT A
COILS
Size 070 075
Size 070, 075
Controlling Output
i C
c r
u
t i
S
f o
w t
a
e r
A
CONDFAN3
RCB Rly 1
B
CONDFAN1
MBB Rly 6
A
CONDFAN4
RCB Rly 2
B
CONDFAN2
MBB Rly 5
Circuit A
# of Fans ON
CIRCUIT B
Stage 1
OFC3
COILS
Stage 2
OFC3,4
Low Ambient Prestart 1 (OAT ≤
5
0
°F
)
=
S
a t
g
e
L
o
w
A
m
b
e i
t n
P
e r
s
a t
t r
2
5 (
0
°F
<
O
A
T
<
7
0
°F
)
=
High Ambient Prestart (OAT ≥
7
0
°F
)
=
S
a t
g
e
2
A
o l l
w
F
a
n
S
a t
g
n i
g
f i
O
A
T
<
7
0
°F
Fig. 6 — Condenser Fan Staging Sequence (cont)
Contactor
OFM(s)
B
o
a
d r
Controlled
Controlled
OFC1
OFM1
OFC2
OFM2,3
OFC3
OFM4
Fans ON
M.M. = YES
O
F
M
1
S
a t
g
e
1
O
F
M
2
3 ,
S
a t
g
e
2
F
M
1
2 ,
3 ,
S
a t
g
e
3
F
M
1
2 ,
3 ,
4 ,
S
a t
g
e
4
1
L
o
w
A
m
b
e i
t n
S
a t
g
e
3
L
o
w
A
m
b
e i
t n
H
g i
h
A
m
b
e i
t n
A
o l l
w
F
a
n
S
a t
Contactor
OFM(s)
Controlled
B
o
a
d r
Controlled
OFC3
OFM3
OFC1
OFM1
OFC4
OFM4
OFC2
OFM2
Fans ON
Circuit B
1
OFM3
Stage 1
2
OFM3,4
Stage 2
1
L
o
w
A
m
b
e i
t n
S
a t
g
e
2
L
o
w
A
m
b
e i
t n
H
g i
h
A
m
b
e i
t n
A
o l l
w
F
a
n
S
a t
Logic
Comp A1, A2, B1 or B2 ON
Circuit A or B SCT or OAT
Circuit A or B SCT or OAT
# of Fans ON
Fans ON
O
F
C
1
1
O
F
O
F
C
1
3 ,
2
O
F
M
O
F
C
1
2 ,
3
O
F
M
O
F
C
1
2 ,
3 ,
4
O
F
M
1
P
e r
s
a t
t r
1
(
O
A
T
≤ 50°F) = Stage 1
P
e r
s
a t
t r
2
5 (
0
°F
<
O
A
T
<
7
0
°F
)
=
S
a t
g
e
3
P
e r
t s
r a
( t
O
A
T
≥ 70°F) = Stage 4
g
n i
g
f i
O
A
T
<
7
0
°F
L
o
g
c i
Comp A1 or A2 ON
Comp B1 or B2 ON
Circuit A SCT or OAT
Circuit B SCT or OAT
# of Fans ON
Fans ON
OFC1
1
OFM1
OFC1,2
2
OFM1,2
P
e r
s
a t
t r
1
(
O
A
T
≤ 50°F) = Stage 1
P
e r
s
a t
t r
2
5 (
0
°F
<
O
A
T
<
7
0
°F
)
=
S
a t
g
e
2
P
e r
t s
r a
( t
O
A
T
≥ 70°F) = Stage 2
g
n i
g
f i
O
A
T
<
7
0
°F
M
1
1
4 ,
1
2 ,
3 ,
2 ,
3 ,
4 ,
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