9: Fan Coil Unit - 3-Speed Fan, 1-Stage Or Modulated Cooling, 2-Stage Or Modulated Heating; Control Schematics - Automated Logic RC642 Technical Instructions

#9: Fan coil unit - 3-speed fan, 1-stage or modulated cooling, 2-stage or modulated
heating

Control schematics

Typical layout with analog heating and cooling:
BI - Fan status
(optional)
BO - Fan low speed
BO - Fan medium speed
BO - Fan high speed
Typical layout with staged heating and cooling:
RA
BI - Fan status
(optional)
BO - Fan low speed
BO - Fan medium speed
BO - Fan high speed
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
HWS HWR
CHWR CHWS
BI - Smoke detector
(optional)
AI - Discharge air temp
(optional)
DX Elec
BO - Heating stage 1
BO - Heating stage 2
70
T
AO - Heating valve
AI - Zone temp
AI - Zone setpoint adjust
BI - Zone override
T
T
AI - Zone temp
AI - Zone setpoint adjust
T
BI - Zone override
DA