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6
6
5
5
MM
MM
A3
A3
A2
A2
A1
A1
4
4
3
3
B1
B1
B3
B3
B2
B2
2
2
MM
MM
1
CONTROL BOX
Low Ambient Prestart 1 (OAT ≤ 50°F) = Stage 1
Low Ambient Prestart 2 (50°F < OAT < 70°F) = Stage
High Ambient Prestart (OAT ≥ 70°F) = Stage 6
A
o l l
w
F
a
For 100 Ton Only
If Circuit B is ON and
If M.M. = NO
M
i n i
m
u
m
F
a
n
S
a t
g
e
=
2
F (
a
n
S
a t
g
e
1
c
a
u
s
e
s
u
n
s
a t
b
e l
O
p
e
a r
o i t
) n
Low Ambient Prestart 1 (OAT ≤
Low Ambient Prestart 2 (50°F < OAT < 70°F) = Stage 2
High Ambient Prestart (OAT ≥ 70°F) = Stage 4
A
o l l
w
F
a
LEGEND
MM
— Motormaster
OAT
— Outdoor Air Temperature
OFC
— Outdoor Fan Contactor
OFM — Outdoor Fan Motor
SCT
— Saturated Condensing Temperature
CIRCUIT A
COILS
Size 090, 100
i C
c r
u
t i
Common
A
B
C
o
m
m
o
n
C
R I
C
U
T I
B
Circuit A, M.M. = NO
COILS
Stage 1*
OFC4
Stage 2
OFC3
Stage 3
OFC4,3
Stage 4
OFC4,1
Stage 5
OFC3,1
Stage 6
OFC3,4,1
* Stage 1 valid only when OAT
M.M. = NO
n
S
a t
g
n i
g
f i
O
A
T
<
7
0
°F
Circuit A, M.M. = YES
S
a t
g
e
1
O
S
a t
g
e
2
O
Stage 3
OFC3,1
Stage 4
OFC4,3,1
M.M. = YES
5
0
) °F
=
S
a t
g
e
1
n
S
a t
g
n i
g
f i
O
A
T
<
7
0
°F
Fig. 6 — Condenser Fan Staging Sequence (cont)
Controlling Output
Contactor
S
f o
w t
a
e r
B
o
a
d r
C
o
t n
o r
e l l
CONDFAN4
RCB Rly 2
OFC4
CONDFAN3
RCB Rly 1
OFC3
CONDFAN2
MBB Rly 5
OFC2
CONDFAN1
MBB Rly 6
y
O
F
C
1
CIRCUIT A ON ONLY
#
f o
F
a
n
s
O
N
Fans ON
0.5
OFM4
1
OFM6
1.5
OFM4,6
2
OFM4,1,3,5
2.5
OFM6,1,3,5
3
OFM4,6,1,3,5
≤
55°F
CIRCUIT A AND B ON
Common, M.M. = NO
Stage 1
OFC4
Stage 2
OFC2,3
S
a t
g
e
3
O
F
C
1
Stage 4
OFC1,4
Stage 5
OFC1,2,3
Stage 6
OFC1,2,3,4
C
R I
C
U
T I
A
O
N
O
N
L
Y
# of Fans ON
Fans ON
F
C
3
1
O
F
M
6
F
C
4
3 ,
1
5 .
O
F
M
4
6 ,
2.5
OFM6,1,3,5
3
OFM4,6,1,3,5
CIRCUIT A AND B ON
Common, M.M. = YES
S
a t
g
e
1
O
F
C
2
3 ,
Stage 2
OFC2,3,4
Stage 3
OFC2,3,1
S
a t
g
e
4
O
F
C
1
2 ,
3 ,
4 ,
OFM(s)
d
C
o
t n
o r
e l l
d
Comp A1, A2, or A3 ON,
OFM4
or Comp B1, B2, or B3 ON
OFM6
Circuit A SCT or OAT
OFM2
Circuit B SCT or OAT
O
F
M
1
3 ,
5 ,
Circuit A or B SCT or OAT
C
R I
C
U
T I
B
O
N
Circuit B, M.M. = NO
# of Fans ON
Stage 1*
OFC4
Stage 2
OFC2
Stage 3
OFC4,2
Stage 4
OFC4,1
Stage 5
OFC2,1
Stage 6
OFC4,2,1
# of Fans ON
Fans ON
1
OFM4
2
OFM2,6
3
O
F
M
1
3 ,
5 ,
4
OFM4,1,3,5
5
OFM2,6,1,3,5
6
OFM1,2,3,4,5,6
C
R I
C
U
T I
B
O
N
Circuit B, M.M. = YES
# of Fans ON
S
a t
g
e
1
O
F
C
2
S
a t
g
e
2
O
F
C
4
2 ,
Stage 3
OFC2,1
Stage 4
OFC4,2,1
# of Fans ON
Fans ON
2
O
F
M
2
6 ,
3
OFM2,4,6
5
OFM2,6,1,3,5
6
O
F
M
1
2 ,
3 ,
4 ,
5 ,
6 ,
L
o
g
c i
O
N
L
Y
Fans ON
0.5
OFM4
1
OFM2
1.5
OFM4,2
2
OFM4,1,3,5
2.5
OFM2,1,3,5
3
OFM4,2,1,3,5
O
N
L
Y
Fans ON
1
O
F
M
2
1
5 .
O
F
M
4
2 ,
2.5
OFM2,1,3,5
3
OFM4,2,1,3,5
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