58
Circuit B
Coils
Circuit A
Coils
POWER
BOX
3
MM
2
A4
A3
B2
B1
B3
1
6
4
A2
MM
5
A1
B4
Contactor
OFM(s)
Software
Board
Conrolled
Controlled
Logic
A
CONDFAN1
MBB Rly 6
OFC1
OFM2
See Table
A
CONDFAN2
MBB Rly 5
OFC2
OFM 1,3
See Table
B
CONDFAN3
RCB Rly 1
OFC3
OFM5
See Table
B
CONDFAN4
RCB Rly 2
OFC4
OFM 4,6
See Table
Common,
M.M.=YES
or NO
Contactor
Software Pts
# of Fans ON
Fans ON
Ckt A # Fans ON Ckt B # Fans ON
Staging Logic
Stage Up Logic
Stage Down Logic
Stage 1A
OFC1
CONDFAN1
1
OFM2
1
0
Ckt A on. Stage up by individual circuit when SCTA > SCT_MAX Stage up to Stage 2A when SCTA>SCT_MAX
Stage down, OFC1 off, when Ckt A goes off.
Stage 1B
OFC3
CONDFAN3
1
OFM5
0
1
Ckt Bon. Stage up by individual circuit when SCTB > SCT_MAX
Stage up to Stage 2B when SCTB>SCT_MAX
Stage down, OFC3 off, when Ckt B goes off.
Stage 2A
OFC2
CONDFAN2
2
OFM1,3
2
0
Stage up by individual circuit when SCTA/B > SCT_MAX
Stage up to Stage 3A when SCTA>SCT_MAX
Stage down to Stage 1A when SCTA< SCT_MIN
Stage 2B
OFC4
CONDFAN4
2
OFM4,6
0
2
Stage down by individual circuit when SCTA/B < SCT_MIN
Stage up to Stage 3B when SCTB>SCT_MAX
Stage down to Stage 1B when SCTB < SCT_MIN
Stage 3A
OFC1,2
CONDFAN1,2
3
OFM1,2,3
3
0
Stage up & down by individual circuit
Stage down to Stage 2A when SCTA<SCT_MIN
Stage 3B
OFC3,4
CONDFAN3,4
3
OFM4,5,6
0
3
Up if SCTA/B > SCT_MAX, Down if SCTA/B<SCT_MIN
Stage down to Stage 2B when SCTB<SCT_MIN
Circuit
Controlling Output
Fig. 7 —
75-Ton High Efficiency and 90 to 120-Ton Standard Efficiency Unit Condenser Fan Staging Sequence
a4
8-9
20
4
LEGEND
MM
—
Motormaster
®
Control
OFC
—
Outdoor Fan Contactor
OFM
—
Outdoor Fan Motor
a4
8-9
20
7
Applicable Units
Tonnage
Efficiency
75
High
90
Standard
105
Standard
120
Standard
Summary of Contents for WeatherExpert 48N2
Page 135: ...135 Fig 18 48 50N Typical Power Schematic Nominal 075 Ton Unit Shown ...
Page 136: ...136 Fig 19 48 50N Typical Power Schematic Nominal Ton 90 150 Units Shown ...
Page 137: ...137 Fig 20 48 50N Main Base Board Input Output Connections ...
Page 138: ...138 Fig 21 48 50N RXB EXB CEM Input Output Connections a48 9307 ...
Page 139: ...139 Fig 22 48 50N EXV SCB Input Output Connections a48 9308 ...
Page 140: ...140 Fig 23 48N Typical Modulating Gas Heat Unit Control Wiring ...
Page 141: ...141 Fig 24 50N Typical Electric Heat Unit Control Wiring ...
Page 144: ...144 Fig 27 48N Typical Gas Heat Section Wiring Nominal Ton 120 to 150 Units ...
Page 145: ...145 Fig 28 48 50N Typical Power Component Control Wiring 460 v ...
Page 146: ...146 Fig 29 48 50N Component Control Wiring 575 v Nominal Ton 075 to 150 Units ...
Page 147: ...147 Fig 30 48 50N Component Arrangement Power Box ...
Page 148: ...148 Fig 31 48 50N Component Arrangement Control Box ...
Page 240: ...240 APPENDIX D VFD INFORMATION CONT Fig G VFD Bypass Wiring Diagram WHEN USED ...