Controls, Start-Up, Operation, Service and ... - Climayoreo
Controls, Start-Up, Operation, Service and ... - Climayoreo
Controls, Start-Up, Operation, Service and ... - Climayoreo
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a48-8504<br />
Size 030, 035<br />
Contactor OFM(s)<br />
Controlling Output<br />
2<br />
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o<br />
S<br />
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i<br />
u<br />
c<br />
r<br />
i<br />
C<br />
1<br />
MM<br />
Common CDF.1 MBB Rly 6 OFC1 OFM1 Comp A1 or B1 ON<br />
Common CDF.2 MBB Rly 5 OFC2 OFM2 Circuit A or B SCT or OAT<br />
A1 B1<br />
MM=YES or NO Outputs ON Contactors ON Fans ON<br />
Ckt A, Ckt B or Stage 1 CDF.1 OFC1 OFM1<br />
Ckt A <strong>and</strong> B running Stage 2 CDF.1, CDF.2 OFC1,2 OFM1,2<br />
CONTROL BOX<br />
Low Ambient Prestart 1 (OAT ≤ 50F) = Stage 1<br />
Low Ambient Prestart 2 (50F < OAT < 70F) = Stage 2<br />
High Ambient Prestart (OAT ≥ 70F) = Stage 2<br />
Allow Fan Staging if OAT < 70F<br />
Size 040<br />
54<br />
Contactor OFM(s)<br />
Controlling Output<br />
3<br />
MM<br />
c<br />
i<br />
g<br />
o<br />
L<br />
d<br />
e<br />
l<br />
l<br />
o<br />
r<br />
t<br />
n<br />
o<br />
C<br />
d<br />
e<br />
l<br />
l<br />
o<br />
r<br />
n<br />
o<br />
C<br />
d<br />
r<br />
a<br />
o<br />
B<br />
e<br />
r<br />
a<br />
w<br />
t<br />
f<br />
o<br />
S<br />
t<br />
i<br />
u<br />
c<br />
r<br />
i<br />
C<br />
Common CDF.1 MBB Rly 6 OFC1 OFM3 Comp A1, B1 or B2 ON<br />
Common CDF.2 MBB Rly 5 OFC2 OFM1,2 Circuit A or B SCT or OAT<br />
Ckt<br />
A,<br />
Ckt<br />
B or<br />
Ckt<br />
A <strong>and</strong><br />
B running<br />
Ckt<br />
A,<br />
Ckt<br />
B or<br />
Ckt<br />
A <strong>and</strong><br />
B running<br />
M.M. = NO Outputs ON Contactors ON Fans ON M.M. = YES Outputs ON Contactors ON Fans ON<br />
Stage<br />
1 CDF.<br />
1 OFC1<br />
OFM3<br />
Stage<br />
1 CDF.<br />
1 OFC1<br />
OFM3<br />
Stage<br />
2 CDF.<br />
2 OFC2<br />
OFM1,<br />
2<br />
Stage<br />
2 CDF.<br />
1,<br />
CDF.<br />
2 OFC1,<br />
2 OFM1,<br />
2,<br />
3<br />
Stage 3 CDF.1, CDF.2 OFC1,2 OFM1,2,3<br />
2<br />
1<br />
B2<br />
A1 B1<br />
CONTROL BOX<br />
Low Ambient Prestart 1 (OAT ≤ 50F)<br />
= Stage<br />
1<br />
Low<br />
Ambient<br />
Prestart<br />
1 ( OAT<br />
≤ 50F) = Stage 1<br />
Low<br />
Ambient<br />
Prestart<br />
2 ( 50F<br />
< OAT<br />
< 70F)<br />
= Stage<br />
2<br />
Low<br />
Ambient<br />
Prestart<br />
2 ( 50F<br />
< OAT<br />
< 70F)<br />
= Stage<br />
2<br />
High Ambient Prestart (OAT ≥ 70F) = Stage<br />
3<br />
High<br />
Ambient<br />
Prestart<br />
( OAT<br />
≥ 70F) = Stage 2<br />
Allow<br />
Fan<br />
Staging<br />
if<br />
OAT<br />
< 70F<br />
Allow<br />
Fan<br />
Staging<br />
if<br />
OAT<br />
< 70F<br />
Fig. 7 — Condenser Fan Staging Sequence
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