Carrier Weathermaster 48P2030-100 - Page 57

57
Fig. 7 — Condenser Fan Staging Sequence
LEGEND
MM — Motormaster OAT — Outdoor Air Temperature OFC — Outdoor Fan Contactor OFM — Outdoor Fan Motor SCT — Saturated Condensing Temperature
Size 030, 035
Contactor OFM(s)
cigoLdellortnoCdellornoCdraoBerawtfoStiucriC
Common CONDFAN1 MBB Rly 6 OFC1 OFM1
Comp A1 or B1 ON
Common CONDFAN2 MBB Rly 5 OFC2 OFM2 Circuit A or B SCT or OAT
# of Fans ON
Fans ON
M.M. = YES OR NO Stage 1 OFC1 1 OFM1
Stage 2 OFC1,2 2 OFM1,2
Low Ambient Prestart 1 (OAT ≤ 50F) = Stage 1 Low Ambient Prestart 2 (50F < OAT < 70F) = Stage 2 High Ambient Prestart (OAT ≥ 70F) = Stage 2 Allow Fan Staging if OAT < 70F
Size 040
Contactor OFM(s)
cigoLdellortnoCdellornoCdraoBerawtfoStiucriC
Common CONDFAN1 MBB Rly 6 OFC1 OFM3
Comp A1, B1 or B2 ON
Common CONDFAN2 MBB Rly 5 OFC2 OFM1,2 Circuit A or B SCT or OAT
M.M. = NO
# of Fans ON Fans ON M.M. = YES # of Fans ON Fans ON
Stage 1* 3MFO11CFO*1 egatS3MFO11CFO
3,2,1MFO32,1CFO2 egatS2,1MFO22CFO2 egatS
Stage 3 OFC1,2 3 OFM1,2,3
Controlling Output Controlling Output
CONTROL BOX
1
3
2
CONTROL BOX
1
2
A1 B1
B2
A1
B1
MM
MM
Low Ambient Prestart 1 (OAT ≤ TAO( 1 tratserP tneibmA woL1 egatS = )F05 ≤ 50F) = Stage 1
2 egatS = )F07 < TAO < F05( 2 tratserP tneibmA woL2 egat
S = )F07 < TAO < F05( 2 tratserP tneibmA woL
High Ambient Prestart (OAT ≥ TAO( tratserP tneibmA hgiH3 egatS = )F07 ≥ 70F) = Stage 2
F07 < TAO fi
gnigatS naF wollAF07 < TAO fi gnigatS naF wollA
* Stage 1 valid only when OAT <= 55 F
CONTROL BOX
1
3
2
CONTROL BOX
1
2
A1 B1
B2
A1
B1
MM
MM
CONTROL BOX
1
3
2
CONTROL BOX
1
2
A1 B1
B2
A1
B1
MM
MM
CONTROL BOX
1
3
2
CONTROL BOX
1
2
A1 B1
B2
A1
B1
MM
MM