COPELAND 026-1739 Programmable Touchscreen Thermostat User Manual
3.8.5 Economizer Mode
The ECONOMIZER mode is used to cool the room with fresh
outdoor air instead of air cooled by the compressor when
possible to save energy.
Table 3-12 - Input In State
INPUT INx STATE
To allow the Economizer mode to be activated, the following
conditions must be reached:
Offset added to the input terminal
when the INx STATE is LOCAL. When
the INx STATE is REMOTE, the
OFFSET is not used.
•
•
•
The ECONOMIZER ENABLE must be enabled.
The thermostat mode must be AUTO or COOL.
INPUT INx
OFFSET
The outdoor temperature (IN2) must be below the
ECONOMIZER CHANGEOVER SETPOINT value.
In LOCAL state, this is the
corresponding terminal INx value
with the applied offset.
In REMOTE state, this is the value
written by the Modbus network.
•
•
The outdoor temperature (IN2) must be below the room
temperature.
INPUT VALUE
(INx)
The Supply Air temperature (IN3) must be above the
ECONOMIZER SUPPLY AIR TEMPERATURE SETPOINT
value.
CONTROL TEMPERATURE is
updated according to a relationship
between the thermostat internal
temperature and the INPUT VALUE
(IN1). The formula used to get the
When the Economizer mode is activated, the FAN and ECO
output relays are energized until SET POINT COOL is reached.
CONTROL
TEMPERATURE value is WEIGHT x IN1 +
(1-WEIGHT) x Internal Temperature.
Pre-occupancy Purge
This is used by the thermostat
algorithm (stage, economizer,
display).
The pre-occupancy purge is used only when the schedule is
active. The thermostat energizes the FAN and ECO relay
outputs a period of time before a transition from unoccupied
to occupied. This period is determined by the ECO PRE-
OCCUPANCY PURGE_PERIOD.
INPUT WEIGHT Value used in the CONTROL
IN1
TEMPERATURE calculation.
To allow the pre-occupancy purge to be activated, the
following conditions must be reached:
•
•
•
The ECONOMIZER ENABLE must be enabled.
The scheduler must be enabled.
3.8.4 Dehumidification Mode
The ECO PRE-OCCUPANCY PURGE_PERIOD must be
different than OFF.
When DEHUMIDIFICATION MODE is set to ON, if the current
humidity measure is equal or higher than the
DEHUMIDIFICATION RH SETPOINT, the AUX output relay is
activated. If the current humidity measure is lower than the
DEHUMIDIFICATION RH SETPOINT, the AUX output relay is
deactivated.
NOTE: Note that there is no information on the status of
the economizer on the display.
When the DEHUMIDIFICATION MODE is set to OFF, the AUX
output relay is always deactivated.
NOTE: Note that there is no information on the status of
the dehumidification on the display.
026-1739 R4 Programmable Touchscreen Thermostat
18
©2024 Copeland LP.
| 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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