48
Fig. 8 — Outdoor Fan Staging Sequence for Design Series 4 units (cont)
WITHOUT OPTION
60 Ton RTPF
Contactor
OFM(s)
Software
Board
Conrolled
Controlled
Common
CONDFANA
MBB Rly 6
OFC1
OFM1,2
Common
CONDFANB
MBB Rly 5
OFC2
OFM3,4,5,6
# of Fans ON
Fans ON
# of Fans ON
Fans ON
Stage 1
OFC1
2
OFM1,2
Stage 1
OFC1
2
OFM1,2
Stage 2
OFC2
4
OFM3,4,5,6
Stage 2
OFC2
4
OFM3,4,5,6
Stage 3
OFC1,2
6
OFM1,2,3,4,5,6
Stage 3
OFC1,2
6
OFM1,2,3,4,5,6
Stage 3 if OAT > 75
Stage 3 if SCTA or STCB > HPSP
Stage down if SCTA/B < HPSP -
20
for two minutes and OAT < 73 (stage 2 can only occur when staging down)
WITH GREENSPEED/LOW AMBIENT OPTION
60 Ton RTPF
Contactor
OFM(s)
Software
Board
Conrolled
Controlled
A
OV_ENA
LEN
n/a
OFM 1, 3, 5 Any Circuit A compressor ON, speed via GS_A_VFD
B
OV_ENA
LEN
n/a
OFM 2, 4, 6 Any Circuit B compressor ON, speed via GS_B_VFD
# of Fans ON
Fans ON
# of Fans ON
Fans ON
Stage GS_A
3
OFM1,3,5
Stage GS_B
3
OFM
2,4,6
Start with GS_VFD at 50% when OAT<70F , otherwise at 100%
Stage 1 if OAT > 60F, Follows equation; SCT set point = C1 + C2 * circuit capacity p C3 * OAT
Stage 2 if OAT < 60F, Maintains SCT at 100°F or User input (LASP)
If the SCT sensor has failed, then the control defaults to control based on the OAT sensor and set corresponding circuit GS_VFD at
100% when the ambient is above 65°F and set GS_VFD at 50% when the ambient temperature is below 50°F. Set a linear function
of SCT between 50 and 65°F OAT.
If the SCT and OAT sensors have all failed then the control run the corresponding GS_VFD @ 100% when any compressor is on
the specific circuit.
Circuit
Controlling Output
Logic
Circuit A
Circuit B
Any Compressor ON
If either of the SCT sensors has failed, then the control defaults to control based on the OAT sensor and turns on CONDFANB
when the ambient is above 65 dF and off when the ambient temperature is below 50 dF. If the SCT and OAT sensors have all failed
then the control turns on CONDFANB when any compressor is on.
Circuit
Controlling Output
Logic
Circuit A
Circuit B
4
MM
1
MM
2
3
6
5
GS_A
1
GS_B
4
GS_B
2
GS_A
3
GS_A
5
GS_B
6
OFM_A
1
OFM_
4
OFM_B
2
OFM_
3
OFM_
5
OFM_
6
WITHOUT OPTION
60 Ton MCHX
Contactor
OFM(s)
Software
Board
Conrolled
Controlled
A
CONDFANA
MBB Rly 6
OFC4
OFM4
A
CMPA1/A2
MBB Rly 3/4
OFC3
OFM3
B
CONDFANB
MBB Rly 5
OFC2
OFM2
B
CMPB1/B2
MBB Rly 1/2
OFC1
OFM1
# of Fans ON
Fans ON
# of Fans ON
Fans ON
Stage 1
OFC3
1
OFM3
Stage 1
OFC1
1
OFM1
Stage 2
OFC3,4
2
OFM3,4
Stage 2
OFC1,2
2
OFM1,2
WITH GREENSPEED/LOW AMBIENT OPTION
60 Ton MCHX
Contactor
OFM(s)
Software
Board
Conrolled
Controlled
A
OV_ENA
LEN
n/a
OFM 3 & 4
Any Circuit A compressor ON, speed via GS_A_VFD
B
OV_ENB
LEN
n/a
OFM 1 & 2
Any Circuit B compressor ON, speed via GS_B_VFD
# of Fans ON
Fans ON
# of Fans ON
Fans ON
Stage
GS_A
2
OFM 3 & 4
Stage
GS_B
2
OFM 1 & 2
Start with GS_VFD at 50% when OAT<70F , otherwise at 100%
Stage 1 if OAT > 60F, Follows equation; SCT set point = C1 + C2 * circuit capacity p C3 * OAT
Stage 2 if OAT < 60F, Maintains SCT at 100°F or User input (LASP)
If the SCT sensor has failed, then the control defaults to control based on the OAT sensor and set corresponding circuit GS_VFD at
100% when the ambient is above 65°F and set GS_VFD at 50% when the ambient temperature is below 50°F. Set a linear function of
SCT between 50 and 65°F OAT.
If the SCT and OAT sensors have all failed then the control run the corresponding GS_VFD @ 100% when any compressor is on the
specific circuit.
Circuit
Controlling Output
Logic
Circuit A
Circuit B
Circuit
Controlling Output
Logic
Comp A1 or A2 ON (Compressor AUX contactor)
If the SCTB sensor has failed, then the control defaults to control based on the OAT sensor and turns on CONDFANB when the
ambient is above 65 dF and off when the ambient temperature is below 50 dF. If the SCTB and OAT sensors have all failed then the
control turns on CONDFANB when any compressor is on.
Comp B1 or B2 ON (Compressor AUX contactor)
Circuit A
Circuit B
When CMPA1 or CMPA2 staged ON, OFC3 on due to AUX
contactor
Stage down occurs if SCTA < HPSP -
20
for two minutes and
OAT < 73
When CMPB1 or CMPB2 staged ON, OFC1 on due to AUX contactor
Stage down occurs if SCTB < HPSP -
20
for two minutes and OAT <
73
Stage up occurs if SCTA > HPSP or OAT > 75
Stage up occurs if SCTB > HPSP or OAT > 75
If the SCTA sensor has failed, then the control defaults to control based on the OAT sensor and turns on CONDFANA when the
ambient is above 65 dF and off when the ambient temperature is below 50 dF. If the SCTA and OAT sensors have all failed then the
control turns on CONDFANA when any compressor is on.
OFM
3
OFM
1
2
4
GS_B
1
GS_A
4
GS_B
2
GS_A
3
Summary of Contents for WEATHERMAKER 48A2020
Page 112: ...112 Fig 20 Typical Main Control Box Wiring Schematic 48 50A Units ...
Page 113: ...113 Fig 21 Typical Auxiliary Control Box Wiring Schematic ...
Page 114: ...114 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown ...
Page 115: ...115 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown TO NEXT PAGE ...
Page 116: ...116 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont ...
Page 117: ...117 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown ...
Page 118: ...118 Fig 25 Typical Controls Option Wiring Schematic SW1 SW2 OR DEHUMIDIFY SWITCH ...
Page 119: ...119 Fig 26 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown ...
Page 120: ...120 Fig 27 Typical Power Schematic of Greenspeed Low Ambient Option 48 50A 060 Unit Shown ...
Page 121: ...121 Fig 28 Typical Small Chassis Component Location Size 020 035 Units ...
Page 122: ...122 Fig 29 Typical Large Chassis Component Locations Size 040 060 Units ...
Page 185: ...185 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716 ...