10: Fan Coil Unit - Intermittent Fan, Modulated Or 2-Stage Cooling And Heating; Control Schematics - Automated Logic RC642 Technical Instructions

#10: Fan coil unit - intermittent fan, modulated or 2-stage cooling and heating

Control schematics

Typical layout with analog heating and cooling:
BI - Fan status
(optional)
BO - Fan start/stop
Typical layout with staged heating and cooling:
RA
BI - Fan status
(optional)
BO - Fan start/stop
BI - Freezestat
(optional)
T
M
CT
AO - Cooling valve
BI - Freezestat
(optional)
T
SF
M
CT
BO - Cooling stage 1
BO - Cooling stage 2
BI - Smoke detector
(optional)
AI - Discharge air temp
(optional)
CHW HW
AO - Heating valve
HWS HWR
CHWR CHWS
BI - Smoke detector
(optional)
AI - Discharge air temp
(optional)
DX Elec
BO - Heating stage 1
BO - Heating stage 2
74
T
AI - Zone temp
AI - Zone setpoint adjust
BI - Zone override
T
T
DA
AI - Zone temp
AI - Zone setpoint adjust
T
BI - Zone override