Carrier 3V VVT 33ZCVVTZC-01 - Appendix A - System Operation; Flow Charts

APPENDIX A -- SYSTEM OPERATION FLOW CHARTS
3VTM System Mode Selection
LEGEND
ACD -- Avg Coot Demand
AHD -- Avg Heat Demand
CLO SPT -- OAT Cooting
Lockout Setpoint
CSA DMD -- Cool Start Avg.
Demand
C HYST -- Cool Demand
Hysteresis
HLO SPT -- OAT Heating
Lockout Setpoint
HSA DMD -- Heat Start Avg
Demand
H HYST -- Heat Start
Hysteresis
OAT -- Outside Air
Temperature
OZT -- Occupied Zone
Temperature
RZCSP -- Reference Zone
Cool Setpoint
RZHSP -- Reference Zone
Heat Setpoint
RZSPT -- Reference Zone
Space Temp
[ S cfnrZ°no_ aCn°dthdlatrd einSy_e m ]
>=CSA DMD and YES
NO
_RZSPT < J NO
Calculate ACD & AHD
YES
Cooling?
NO _ YES
"gest cool
zone demand?
NO
Send Linkage data
OZT = RZSPT
I System demand = Cooling t
Send Linkage data
OZT = RZCSP
4,
I System demand = Cooling I_
II_ Send Linkage dataOZT = (RZCSP _RZHSP) + RZCSP
÷
I System demand = None
Send Linkage data
OZT =RZSPT
4,
I System demand = Heating
Send Linkage data
OZT = RZHSP
4,
I System demand = Heating
IP' Send Linkage data
OZT = (RZCSP _RZHSP) + RZCSP
4,
I System demand = None
NO
CSA_DMD?
Fsys emd.....d=OooIin01
Start system mode
reselect timer
Send Unkage data
QZT = RZSPT
Isystemd....d=Heatino1
__CLO SPT? YES YES
ISystemd .... d=CooiJngl_J L_systemd .... d=HeatJng I
I_ Sta_SYeSt(tnlmm°de ]_q
Send Linkage data
OZT = RZSPT
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