COPELAND 026-1739 Programmable Touchscreen Thermostat User Manual
When at least one parameter is overridden, the following
parameters cannot be modified by the BMS:
3.5.9 Screen Lock
The touchscreen of the thermostat can be locked. Screen can
be locked completely or partially. When the screen is
completely locked, the user cannot modify any parameter on
the screen. When the screen is partially locked, the user can
only modify the setpoints and nothing else. The Screen Lock
function can only be accessed remotely through the Modbus
network interface. The Screen Lock options are:
1. Setpoint heat occupied.
2. Setpoint heat unoccupied.
3. Setpoint cool occupied.
4. Setpoint cool unoccupied.
5. Thermostat mode.
•
•
Lock the screen completely
6. Occupancy mode.
Lock the screen partially (can adjust temperature
setpoints)
Resetting the override:
•
Unlock the screen
1. For both BMS schedule and Backup schedule, users can
reset the override by pressing the text “override” on the
GUI.
When the screen is completely locked, a lock icon will appear
on the screen (see Figure 3-30). While the screen is partially
locked, if something other than setpoints is touched or
pressed, the lock icon will appear for short time
(approximately one second) to indicate that the touched
button is locked.
2. BMS can reset the override through the thermostat
application. The
thermostat executes the command and resets the
override.
3. Deactivating the schedule resets the override.
If communication with the BMS is lost while the screen is
locked, the thermostat waits up to 10 minutes before
auto-unlocking the screen (users have all-access). If
communication between BMS and the thermostat is
re-established, the BMS needs to send the lock request in
order to lock the screen again.
Note that resetting the override is not possible if the HOLD
mode is active (this applies for GUI and BMS).
When the Backup schedule is active, override resets when the
next event/period is reached (for example, the programmed
schedule resumes).
Current values vs scheduled values:
Scheduled values are those values that application reads
from the memory and will be used according to the schedule.
Override values are not stored in memory, and are used for
certain periods according to the needs of the user. In all times,
the Modbus registers hold the current values that are used by
the thermostat.
Override status:
BMS can read the OVERRIDE STATUS to verify if override is
taking place or not. (This applies only for the BMS schedule).
Intuitively, if BMS communicates with the thermostat, the
Backup schedule is automatically inactive.
Figure 3-30 - Locked Screen with Lock Icon
NOTE:
When an override is taking place, it stays in the following
conditions:
1. Override stays if BMS schedule becomes inactive and
Backup schedule becomes active due to loss of
communication between thermostat and BMS.
2. Override stays if Backup schedule becomes inactive and
BMS schedule becomes active due to re-establishment
of communication between thermostat and BMS.
3. In case of Backup schedule, override stays as long as
Hold mode is active and the next event/period is reached
(HOLD mode has been activated while override is taking
place).
15
©2024 Copeland LP.
026-1739 R4 Programmable Touchscreen Thermostat
| General | Details |
|---|---|
| Name | COPELAND 026-1739 Programmable Touchscreen Thermostat User Manual |
| Make | Copeland |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.72 MB |
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