Carrier Weathermaster 48P2030-100 - Page 59

59
Fig. 7 — Condenser Fan Staging Sequence (cont)
CIRCUIT
A
COILS
Size 090, 100
Contactor OFM(s)
cigoLdellortnoCdellornoCdraoBerawtfoStiucriC
A CONDFAN3 RCB Rly 1 OFC3 OFM6 Circuit A SCT or OAT B CONDFAN2 MBB Rly 5 OFC2 OFM2 Circuit B SCT or OAT
Circuit A or B SCT or OATCONDFAN1 MBB Rly 6 5,3,1MFO1CFOnommoC
Controlling Output
Common CONDFAN4 RCB Rly 2
OFC4 OFM4
Comp A1, A2, or A3 ON,
or Comp B1, B2, or B3 ON
2
5
3
4
6
A3 A2
B3 B2
A1
B1
MM
MM
NO snaF fo #B TIUCRIC Fans ON # of Fans ON Fans ON
COILS Stage 1* OFC4 0.5 OFM4 Stage 1* OFC4 0.5 OFM4
Stage 2 OFC3 1 OFM6 Stage 2 OFC2 1 OFM2 Stage 3 OFC4,3 1.5 OFM4,6 Stage 3 OFC4,2 1.5 OFM4,2 Stage 4 OFC4,1 2 OFM4,1,3,5 Stage 4 OFC4,1 2 OFM4,1,3,5 Stage 5 OFC3,1 2.5 OFM6,1,3,5 Stage 5 OFC2,1 2.5 OFM2,1,3,5 Stage 6 OFC3,4,1 3 OFM4,6,1,3,5 Stage 6 OFC4,2,1 3 OFM4,2,1,3,5
* Stage 1 valid only when OAT <= 55 F
Low Ambient Prestart 1 (OAT ≤ 50F) = Stage 1 # of Fans ON
Fans ON
Low Ambient Prestart 2 (50F < OAT < 70F) = Stage 3 Stage 1 OFC4 1 OFM4 High Ambient Prestart (OAT ≥ 70F) = Stage 6
Stage 2 OFC2,3 2 OFM2,6
5,3,1MFO31CFO3 egatSF07 < TAO fi gnigatS naF wollA
Stage 4 OFC1,4 4 OFM4,1,3,5 Stage 5 OFC1,2,3 5 OFM2,6,1,3,5
For 100 Ton Only
Stage 6 OFC1,2,3,4 6 OFM1,2,3,4,5,6
If Circuit B is ON and If M.M. = NO # of Fans ON
Fans ON # of Fans ON Fans ON
2MFO12CFO1 egatS6MFO13CFO1 egatS2 = egatS naF muminiM
2,4MFO5.12,4CFO2 egatS6,4MFO5.13,4CFO2 egatS)noi
tarepO elbatsnu sesuac 1 egatS naF(
Stage 3 OFC3,1 2.5 OFM6,1,3,5 Stage 3 OFC2,1 2.5 OFM2,1,3,5 Stage 4 OFC4,3,1 3 OFM4,6,1,3,5 Stage 4 OFC4,2,1 3 OFM4,2,1,3,5
# of Fans ON
Fans ON
Low Ambient Prestart 1 (OAT ≤ 6,2MFO23,2CFO1 egatS1 egatS = )F05
Low Ambient Prestart 2 (50F < OAT < 70F) = Stage 2 Stage 2 OFC2,3,4 3 OFM2,4,6 High Ambient Prestart (OAT ≥ 70F) = Stage 4
Stage 3 OFC2,3,1 5 OFM2,6,1,3,5
6,5,4,3,2,1MFO64,3,2,1CFO4 egatSF07 < TAO fi gnigatS naF wollA
YLNO NO B TIUCRICYLNO NO A TIUCRIC
CIRCUIT A AND B ON
YLNO NO B TIUCRICYLNO NO A TIUCRIC
Circuit B, M.M. = NO
y
Circuit A, M.M. = NO
Circuit A, M.M. = YES
CIRCUIT A AND B ON
Circuit B, M.M. = YES
Common, M.M. = YES
M.M. = NO
M.M. = YES
Common, M.M. = NO
CONTROL BOX
1
2
5
3
4
6
A3 A2
B3 B2
A1
B1
MM MM
LEGEND
MM — Motormaster OAT — Outdoor Air Temperature OFC — Outdoor Fan Contactor OFM — Outdoor Fan Motor SCT — Saturated Condensing Temperature