COPELAND 026-1739 Programmable Touchscreen Thermostat User Manual
Switch #1: Pull-up resistor enable (PU+)
3.6 Communication Network
This switch provides the ability to add a pull-up resistor
(510 Ohms) on the RS-485 network for bias purposes.
Normally, this switch is in the OFF position (no pull-up resistor
on the network).
3.6.1 RS-485 Serial Link
The thermostat is equipped with a RS-485 serial data link to
communicate with the BMS. Communication with the
Programmable Touchscreen Thermostat is performed via the
Modbus RTU protocol over the RS-485 link. The Modbus
network is used to read the status of the thermostat and/or
apply new settings to modify its operation.
Switch #2: End of Line resistor enable (EOL)
This switch provides the ability to add a termination resistor
(120 Ohms) on the RS-485 network for termination purposes.
If you do have a termination resistor elsewhere on your
network setup, put this switch in the OFF position. If you donot
need a termination resistor from the thermostat, put this switch
in the ON position.
There are three (3) switches (DIP switch) that allow enabling
or disabling some termination and bias resistors for the proper
function of the RS-485 network (see Figure 3-31). These
switches are located on top-right corner when the thermostat
enclosure is open.
Switch #3: Pull-down resistor enable (PD-)
This switch provides the ability to add a pull-down resistor
(510 Ohms) on the RS-485 network for bias purposes.
Normally, this switch is in the OFF position (no pull-down
resistor on the network.)
3.7 Power Outage
In case of a power outage, the last settings of the thermostat
are kept in volatile memory and retrieved upon power restore.
The only exception not stored in non-volatile memory is the
Manual Override Mode (see Section 3.5.8, Manual
Override). The thermostat is equipped with an
RTC (Real-Time Clock) device that is connected to a backup
battery. This lithium coil cell battery only maintains time and
date in the unlikely event of a power outage. The expected
lifetime of the battery is seven (7) years.
Figure 3-31 - Modbus RS-485 Network Configuration Switches
3.8 Advanced Settings
3.8.1 Thermostat System Configuration
Default Value: IDLE
The thermostat can control different types of HVAC equipment, and is configured accordingly by the thermostat control
configuration. The supported types are Conventional Systems such as Rooftop Units (RTU) and Heat-pump Systems (HP).
To prevent any damage to the system upon first boot-up sequence of the thermostat, once installed, the default control
configuration is IDLE, which means that all outputs are set in floating state to prevent any equipment issue.
Table 3-9 - Thermostat Configuration
IDLE
(Default)
RTU (Roof-Top Unit)
Conventional System
HP_O
(Heat-pump)
HP_B
(Heat-pump)
Stage
Heat
Activated
Cool
1
2
1
2
-
-
-
-
W1
W1+W2
Y1
Y1
Y1+B
Y1+Y2+B
Y1
Y1+Y2
Y1+O
Activated
Y1+Y2
Y1+Y2+O
Y1+Y2
026-1739 R4 Programmable Touchscreen Thermostat
16
©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 |
(1 votes, average: 5.00 out of 5)
Loading...
COPELAND 1F95G-1235GC Humidity Universal Thermostat Instruction Manual
COPELAND ST55 Sensi Smart Thermostat Instruction Manual
COPELAND 1F76U-22WFB Series Sensi Lite Smart Thermostat Installation Guide
COPELAND P-N 810-1600 Programmable Touchscreen Thermostat User Guide
COPELAND 1F86-0244 Blue 2 Inch Single Stage Thermostat Instruction Manual
EPH CONTROLS CDC2 Cylinder Room Thermostat User Guide
beca BAC-2000-ML Modulating Touch Button Thermostats User Guide
sinope TH1300ZB-C4 3600W Smart Floor Heating Thermostat Installation Guide
EPH CONTROLS eTRV Smart Radiator Thermostat Instruction Manual
king K702E-2 SimplStat Electronic Thermostat Instruction Manual
Honeywell Home M38794 T10 and T10 plus Pro Smart Thermostat with RedLINK Installation Guide
Honeywell Lyric T5 Wi-Fi Thermostat Installation Guide
Danfoss Heating Solutions WT-T BasicPlus2 Room Thermostat Installation Guide
nVent RAYCHEM RAYSTAT-EX-02 Mechanical Thermostat Installation Guide
Thermafloor HT1 Thermostat White App Electric Mat Thermostat User Guide