Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 59

MM
7
9
8
A1
A2
4
5
6
A3
A4
MM
1
3
2
POWER
BOX
Controlling Output Contactor
Circuit Software Board Conrolled
A CONDFAN1 MBB Rly 6 OFC1
Common CONDFAN2 MBB Rly 5 OFC2
B CONDFAN3 RCB Rly 1 OFC3
A CONDFAN4 RCB Rly 2 OFC4
B CONDFAN5 RCB Rly 3 OFC5
Common,
M.M.=YES
or NO Contactor Software Pts # of Fans ON
Stage 1A OFC1 CONDFAN1 1
Stage 1B OFC3 CONDFAN3 1
Stage 2A OFC2 CONDFAN2 3
Stage 2B OFC2 CONDFAN2 3
Stage 3A OFC1,2 CONDFAN1,2 4
Stage 3B OFC2,3 CONDFAN2,3 4
Stage 4A OFC2,4 CONDFAN2,4 5
Stage 4B OFC2,5 CONDFAN2,5 5
Stage 5A OFC2,1,4 CONDFAN1,2,4 6
Stage 5B OFC2,5,3 CONDFAN2,3,5 6
LEGEND
MM — Motormaster
® Control
OFC — Outdoor Fan Contactor
OFM — Outdoor Fan Motor
Fig. 8 — 90 to 130-Ton High Efficiency and 130 and 150-Ton Standard Efficiency Unit Condenser Fan Staging Sequence
Circuit B
Coils
B4
B3
B2
B1
Circuit A
Coils
OFM(s) Logic
Controlled
See Table
OFM2
See Table
OFM 4,5,6
See Table
OFM8
OFM 1,3 See Table
OFM 7,9 See Table
Fans ON Ckt A # Fans ON Ckt B # Fans ON
Ckt A on. Stage up when either circuit is > SCT_MAX Stage up to Stage 2A AND Stage 2B when either circuit SCT>SCT_MAX
OFM2 1 0
Ckt B on. Stage up when either circuit is > SCT_MAX Stage up to Stage 2A AND Stage 2B when either circuit SCT>SCT_MAX
OFM8 0 1
OFM4,5,6 1.5 1.5 Stage up by individual circuit when SCT > SCT_MAX
Stage down when both circuits SCT < SCT_MIN
OFM4,5,6 1.5 1.5
OFM4,5,6,2 2.5 1.5 Stage up & down by individual circuit
OFM4,5,6,8 1.5 2.5 Up if SCT > SCT_MAX, Down if SCT<SCT_MIN
OFM4,5,6,1,3 3.5 1.5 Stage up & down by individual circuit
OFM4,5,6,7,9 1.5 3.5 Up if SCT > SCT_MAX, Down if SCT<SCT_MIN
OFM4,5,6,1,2,3 4.5 1.5 Stage down by individual circuit
OFM4,5,6,7,9,8 1.5 4.5 Down if SCT<SCT_MIN
Applicable Units
Tonnage Efficiency
90 High
105 High
120 High
130 Standard
130 High
150 Standard
Staging Logic
Stage up to Stage 3A when SCTA>SCT_MAX
Stage up to Stage 3B when SCTB>SCT_MAX
Stage up to Stage 4A when SCTA>SCT_MAX
Stage up to Stage 4B when SCTB>SCT_MAX
Stage up to Stage 5A when SCTA>SCT_MAX
Stage up to Stage 5B when SCTB>SCT_MAX
Stage Up Logic
Stage down, OFC1 off, when Ckt A is off.
Stage down, OFC3 off, when Ckt B is off.
Stage down to Stage 1A when SCTA AND SCTB < SCT_MIN
Stage down to Stage 1B when SCTA AND SCTB < SCT_MIN
Stage down to Stage 2A when SCTA<SCT_MIN
Stage down to Stage 2B when SCTB<SCT_MIN
Stage down to Stage 3A when SCTA<SCT_MIN
Stage down to Stage 3B when SCTB<SCT_MIN
Stage down to Stage 4A when SCTA<SCT_MIN
Stage down to Stage 4B when SCTB<SCT_MIN
Stage Down Logic