Carrier 30MP - Operational Modes; Scheduling Options; Demand Limiting

Sequence of Operation
30MP Multi-chiller CARRIER CORPORATION ©2018
Installation and Start-up Guide All rights reserved
23
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.
Demand limiting
The 30MP Multi-chiller can provide up to 3 stages of demand limiting, if connected to an electric metering
program indicating that demand limiting is required.
Demand Limiting works using 2 different methods. The first connects the BACnet network input point
System Cool
Demand Level
to the electric metering program, to send a value for the demand level. The second method is a
binary input point BI-5
Ext Demand Limit
that sets the demand level to level #2 when the input is active.
Demand Level 1, called the red line limit, sets the maximum chiller capacity to the current operating capacity, so
that no additional capacity can be added. This prevents further increase in demand, although it will not prevent
any necessary capacity reduction.
Demand levels 2 and 3 provide an adjustment to the operating setpoint. Demand level 2 occurs when
System
Cool Demand Level
is set to 2 or the
Ext Demand Limit
input is active. This increases the chilled water setpoint by
the configured
Demand Level 2 Cool Adj
amount. Demand Level 3 occurs when
System Cool Demand Level
is set
to 3. This increases the chilled water setpoint by the configured
Demand Level 3 Cool Adj
amount. If the
System
Cool Demand Level
is set to 0 and the BI-5
Ext Demand Limit
is inactive, then there is no demand limiting.