Engineered Comfort Fan Coil Controller EZstat Especificaciones descargar pdf (Pagina 27)

Installation and Operation Manual

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Fan Coil Controller – EZstat

EC-EZstat

Date: 9-2014 Supersedes: NEW

Engineered Comfort reserves the right to change any information concerning product or speciﬁcation without notice or obligation.

Page 27 of 36

Procedure Steps Display

User lockout

buons

Choose KEY LOCKOUT from the ADVANCED menu to limit accessibility to

users with Password 1, the user password.

• MODE/SETPOINTS—Users with Password 1 cannot change any

value or mode.

• MODE—Users with Password 1 cannot change the heang/

cooling, fan, or occupancy modes.

• NONE—Users with Password 1 have full access to acve

setpoints, heang/cooling, fan, and occupancy modes.











7 SEQUENCES OF OPERATION

Topics in this secon cover the sequences of operaon for the EZstat. These are advanced topics for control’s technicians and

engineers.

This secon covers the following sequences of operaon:

• Setpoint Limits

• Occupancy

• Automac cooling and heang changeover

• Scheduling occupancy

• Display blanking and backlight

• Temperature sensing inputs

• PID control loops

• Valve operaon for fan coil units

• Fan operaon for fan coil units

7.1 Setpoint Limits

The programming in the EZstat will limit the setpoint entry so that no heang setpoint is set higher than its corresponding

cooling setpoint.

If a user is adjusng a setpoint and it falls within the range set by the value of Minimum Setpoint Dierenal, the

corresponding setpoint will be changed to maintain the dierenal. For example, the Minimum Setpoint Dierenal is

4° F and the Occupied Heang setpoint is 70° F. If the user lowers the Occupied Cooling setpoint to 71° F, the controller

recalculates the Occupied Heang setpoint and changes it to 67° F.

7.2 Occupancy

The EZstat is designed to operate as a stand‑alone controller and can determine occupancy based on its internal occupancy

schedule. The EZstat can be in any one of the following occupancy states.

• OCCUPIED

• UNOCCUPIED

The occupancy and standby states can also be commanded by another BACnet device or an operator workstaon

connected to the building automaon network.

Occupied

In controllers without a moon sensor, the EZstat starts in the occupied state. If the internal schedule is enabled, the state

of the schedule is set to either OCCUPIED or UNOCCUPIED as the inial state.

Unoccupied

The controller changes to the UNOCCUPIED state only if the internal occupancy schedule is enabled and if the schedule is

inacve.

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Engineered Comfort Fan Coil Controller EZstat Especificaciones Pagina 27

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