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2
2
2
2
MM
MM
MM
MM
1
1
1
1
A1
A1
A1
A1
B1
B1
B1
B1
CONTROL BOX
CONTROL BOX
CONTROL BOX
CONTROL BOX
MM
MM
MM
MM
3
3
3
3
1
1
1
1
2
2
2
2
B1
B1
B1
B1
B2
B2
B2
B2
A1
A1
A1
A1
CONTROL BOX
CONTROL BOX
CONTROL BOX
CONTROL BOX
LEGEND
MM
— Motormaster
OAT — Outdoor Air Temperature
OFC — Outdoor Fan Contactor
OFM — Outdoor Fan Motor
SCT
— Saturated Condensing Temperature
Size 030, 035
Controlling Output
Circuit
S
f o
w t
a
e r
Common
CONDFAN1
Common
CONDFAN2
M.M. = YES OR NO
Stage 1
Stage 2
Low Ambient Prestart 1 (OAT ≤ 50°F) = Stage 1
Low Ambient Prestart 2 (50°F < OAT < 70°F) = Stage 2
High Ambient Prestart (OAT ≥ 70°F) = Stage 2
Allow Fan Staging if OAT < 70°F
Size 040
Controlling Output
i C
c r
u
t i
S
f o
w t
a
e r
Common
CONDFAN1
Common
CONDFAN2
M.M. = NO
# of Fans ON
Stage 1*
O
F
C
1
1
S
a t
g
e
2
O
F
C
2
2
Stage 3
OFC1,2
3
Low Ambient Prestart 1 (OAT ≤
5
0
°F
)
=
S
a t
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
A
o l l
w
F
a
n
S
a t
g
n i
g
f i
O
A
T
<
7
0
°F
* Stage 1 valid only when OAT
≤
55°F
Fig. 6 — Condenser Fan Staging Sequence
Contactor
OFM(s)
B
o
a
d r
C
o
t n
o r
e l l
d
C
o
t n
o r
e l l
MBB Rly 6
OFC1
OFM1
MBB Rly 5
OFC2
OFM2
# of Fans ON
Fans ON
OFC1
1
OFM1
OFC1,2
2
OFM1,2
Contactor
OFM(s)
B
o
a
d r
C
o
t n
o r
e l l
d
C
o
t n
o r
e l l
MBB Rly 6
OFC1
OFM3
MBB Rly 5
OFC2
OFM1,2
Fans ON
M.M. = YES
O
F
M
3
S
a t
g
e
O
F
M
1
2 ,
S
a t
g
e
OFM1,2,3
g
e
1
L
o
w
A
m
b
e i
)
=
S
a t
g
e
2
L
o
w
A
m
b
e i
e
3
H
g i
h
A
m
b
A
o l l
w
F
a
n
Logic
d
Comp A1 or B1 ON
Circuit A or B SCT or OAT
L
o
g
c i
d
Comp A1, B1 or B2 ON
Circuit A or B SCT or OAT
# of Fans ON
Fans ON
* 1
O
F
C
1
1
2
O
F
C
1
2 ,
3
O
t n
P
e r
s
a t
t r
1
(
O
A
T
≤ 50°F) = Stage 1
t n
P
e r
s
a t
t r
2
5 (
0
°F
<
O
A
T
<
7
0
°F
)
=
S
a t
g
e
2
e i
t n
P
e r
t s
r a
( t
O
A
T
≥ 70°F) = Stage 2
S
a t
g
n i
g
f i
O
A
T
<
7
0
°F
O
F
M
3
F
M
1
2 ,
3 ,
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