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 percent + 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
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 MCH
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 percent + 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
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