Engineered Comfort Fan Coil Controller EZstat Spécifications Page 27
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Installation and Operation Manual
●
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
buons
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 heang/
cooling, fan, or occupancy modes.
• NONE—Users with Password 1 have full access to acve
setpoints, heang/cooling, fan, and occupancy modes.
7 SEQUENCES OF OPERATION
Topics in this secon cover the sequences of operaon for the EZstat. These are advanced topics for control’s technicians and
engineers.
This secon covers the following sequences of operaon:
• Setpoint Limits
• Occupancy
• Automac cooling and heang changeover
• Scheduling occupancy
• Display blanking and backlight
• Temperature sensing inputs
• PID control loops
• Valve operaon for fan coil units
• Fan operaon for fan coil units
7.1 Setpoint Limits
The programming in the EZstat will limit the setpoint entry so that no heang setpoint is set higher than its corresponding
cooling setpoint.
If a user is adjusng a setpoint and it falls within the range set by the value of Minimum Setpoint Dierenal, the
corresponding setpoint will be changed to maintain the dierenal. For example, the Minimum Setpoint Dierenal is
4° F and the Occupied Heang setpoint is 70° F. If the user lowers the Occupied Cooling setpoint to 71° F, the controller
recalculates the Occupied Heang 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 workstaon
connected to the building automaon network.
Occupied
In controllers without a moon 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 inial state.
Unoccupied
The controller changes to the UNOCCUPIED state only if the internal occupancy schedule is enabled and if the schedule is
inacve.
- Fan Coil Controller – EZstat 1
- CONTENTS 2
- 11/8”(29) 5
- 31/2”(89) 5
- AUTO AUTO 13
- LOCAL OVRD: ON 15
- SECURITY 18
- ADMIN LEVEL 18
- 0 0 0 0 18
- DEVICE ID: 18
- 0000000 18
- 22
- 22
- MOD FAN ACTION 24
- MODULATE 24
- 25
- PASSWORD1: 26
- 27
- 27
- 35
- EC-EZstat 36
- Date: 9-2014 Supersedes: NEW 36
- Page 36 of 36 36
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