Sequence of Operation
Fan Coil CARRIER CORPORATION ©2020
Integration Guide All rights reserved
19
The Fan Coil controls mechanical cooling and heating based on its own space temperature input and setpoints. An
optional CO
2
(Indoor Air Quality) sensor mounted in the space maximizes occupant comfort when used with the
DCV ventilation damper option. See Scheduling (page 19) for occupancy types.
The following sections describe the Fan Coil's functionality. All points in this sequence of operation refer to the
Equipment Touch, i-Vu®, or Field Assistant interface.
Scheduling
Scheduling
You must configure time periods to schedule the transitions from occupied to unoccupied operation. The time
periods control the space temperature to occupied heating and cooling setpoints. The Fan Coil operates
continuously in the Occupied mode until you either configure a Time Schedule or a third party control system
Enables/Disables the BAS On/Off point. You must set the local time and date for these functions to operate
properly.
You can change the occupancy source to one of the following:
• Occupancy Schedules
The controller is occupied 24/7 until you configure a time schedule using the Equipment Touch, Field
Assistant, or the i-Vu® application, or until a third party control system Enables/Disables the BAS On/Off
point. You can disable this by going to Configuration > Unit Configuration > Occupancy Schedules and
changing the point from Enable to Disable and clicking OK.
NOTE You must Enable this point in order for the Equipment Touch, Field Assistant, or the i-Vu® application
to assign a time schedule to the controller.
• Schedule
The unit operates according to the schedule configured and stored in the unit. The schedule is accessible in
the Equipment Touch, Field Assistant, or the i-Vu® application. The daily schedule consists of a start and stop
time (standard or 24 hour mode) and seven days of the week, starting with Monday and ending on Sunday.
• Occupancy Input Contact (optional)
If configured for remote occupancy control (default), the controller can use an external dry contact closure to
determine the occupancy status of the unit. Disable the Occupancy Schedules to use the occupancy contact
input.
NOTE Scheduling can only be controlled from one source.
• BAS (Building Automation System) On/Off
For use with a Building Automation System that supports network scheduling, you must disable the
Occupancy Schedules so the BAS can control the unit through a network communication and the BAS
scheduling function.
NOTE Scheduling can either be controlled from the unit or the BAS, but not both.
• System Occupancy
Uses the network to obtain an occupancy status value from another controller, which is read over the network
and used by this controller. Occupancy Schedules MUST be set to Disable to use this function.
NOTE Scheduling can only be controlled from one source.
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