PECO T8168B-2 BACnet Proportional Thermostat Installation Guide

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CONTROL  

SYSTEMS  

T8168B-2 BACnet^® INSTALLATION GUIDE  

The PECO BACnet^® T8168B-2 thermostat  

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WARNING  

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Thank you for choosing a PECO^® Performance PRO™ thermostat. The  

T8168B-2 thermostat is intended for commercial and residential enviroments. It  

supports both programmable and non-programmable operation.  

Key features include: Either BACnet^® IP or MS/TP Connectivity, auto-  

changeover; optional remote sensor; three levels of keypad lockout with optional  

PIN access code; a heat/cool Demand Indicator; up to four scheduled events per  

day, a 365-day calendar, 20 holidays, holiday override and temporary override.  

• READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTING TO  

INSTALL, OPERATE OR SERVICE THIS THERMOSTAT.  

• Failure to observe safety information and comply with instructions could  

result in PERSONAL INJURY, DEATH AND/OR PROPERTY DAMAGE.  

• To avoid electrical shock or damage to equipment, disconnect power  

before installing or servicing and use only wiring with insulation rated for full  

thermostat operating voltage.  

Applications  

• Use care to avoid electrostatic discharge.  

• To avoid potential fire and/or explosion do not use in potentially flammable  

or explosive atmospheres.  

The PECO^® Performance PRO™ T8168 applications include fan coil, PTAC and  

conventional system with a single, multi speed or 0-10 VDC Fan.  

System Mode Selections: Off-Heat-Cool-Auto  

ON-OFF Heat/Cool Outputs: Up to 2 Heat, 2 Cool  

Proportional Heat/Cool Outputs: Three Wire Floating or 0-10 VDC Control  

Fan Control: Cycling (Auto) or Continuous (On); Up to 3 Speeds or Staged  

Permanent Memory: All device settings are stored in permanent memory.  

Optional Connections: Remote Sensor, Pipe Sensor, Fault Detection and Setback  

• Retain these instructions for future reference.  

• This product, when installed, will be part of an engineered system whose  

specifications and performance characteristics are not designed or  

controlled by PECO^® . Review applications and national and local codes to  

assure that the installation will be functional and safe.  

CAUTION!  

TERMINAL BLOCK DESIGNATIONS  

• 24 VAC low-voltage thermostat. Do not install on voltages higher than 30 VAC.  

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Terminal  

\Description  

Return To  

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• Use copper wire only  

• Use care to avoid electrostatic discharge to the thermostat.  

24 VAC-1 24 VAC 1 (UNSWITCHED)  

24 VAC-2 24 VAC 2  

RATINGS  

Outputs: Y1, Y2, W1, W2, G, G1  

24 VAC (20-30 VAC); 50/60 Hz  

10 VA  

Outputs: WD, GD, YD  

0-10 VDC: Loads must be 1.2K ohms minimum  

4-20 mA: Loads must be 600 ohms maximum  

This thermostat uses triacs switching for accuracy and quiet operation.  

24 VAC-2 24 VAC 2  

Note: A load must be  

connected to outputs  

for testing  

Y1  

W1  

Y2  

W2  

G

COOL 1  

HEAT 1  

COOL Open (TWF)  

HEAT Open (TWF)  

24 VAC 1  

24 VAC 1  

24 VAC 1  

24 VAC 1  

24 VAC 1  

24 VAC 1  

24 VAC 2  

24 VAC 2  

24 VAC 2  

SC  

COOL 2 or FAN 3 (MED) COOL Close (TWF)  

HEAT 2  

HEAT Close (TWF)  

FAN 1 (HI)  

G1  

YD  

WD  

GD  

S1  

S2  

SC  

4A  

4B  

4C  

FAN LO or DAMPER Configurable  

0-10VDC COOL (4-20mA)  

0-10VDC HEAT (4-20mA)  

0-10VDC FAN (4-20mA)  

REMOTE SENSOR, FAULT DETECTION  

PIPE SENSOR  

INSTALLATION INSTRUCTIONS  

Select an appropriate thermostat location  

Locate the thermostat about four feet (1.2m) above the floor on a wall with good  

ventilation, average temperature and good response to temperature changes.  

The T8168 may be mounted on a:  

• Horizontal or vertical 2” X 4” device box  

• Horizontal 4” X 4” device box  

• Flat surface  

SC  

DC/SENSOR COMMON  

RS485A (-)  

Do not locate the thermostat where it can be affected by:  

• Direct sunlight  

• Drafts or dead areas behind doors  

• Radiating heat or cool from appliances or equipment  

• Concealed pipes or chimneys  

RS485B (+)  

RS485 COMMON  

• Outside walls or unheated/uncooled areas  

Required components (not included, unless otherwise specified):  

• Screws and wall anchors (included)  

• WARNING: Disconnect power before beginning installation.  

• CAUTION: Use copper wire only  

• CAUTION: Do not connect unused wires together  

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• Screwdrivers: Phillips (for wallplate); small flathead (for terminal blocks)  

• Drill with 3/16” drill bit (or 7/32” for plaster)  

• Wire cutter and stripper  

TECHNICAL SPECIFICATIONS  

Temperature Control Range: 50° to 90° F (10° to 32° C)  

Differential: 1° F (0.5°C)  

• Level  

Input Power: 24 VAC (20-30 VAC) 50/60 Hz (+/- 10%)  

Terminal Connections: 14-24 AWG stranded or solid wire  

Operating Temperature: 0° to 120°F (-18° to 49°C)  

Shipping/Storage Temperature: -20° to 130°F (-29° to 54°C)  

Operating Humidity: 5% to 95% RH, non-condensing  

Physical Dimensions: 4.3” H x 5.7” W x 1.3”D  

Proportional Output Band Width: 2°F (1°C)  

Mounting holes  

Mounting holes  

Wiring passage  

Proportional Stroke Time Default: 2 Minutes (Configurable)  

© COPYRIGHT 2024 PECO, INC. ALL RIGHTS RESERVED.  

P/N 74599 3220-2406 REV 00  

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Name	PECO T8168B-2 BACnet Proportional Thermostat Installation Guide
Make	PECO
Language	English
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File size	0.42 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• PECO

PECO T8168B-2 BACnet Proportional Thermostat Installation Guide Overview

Summary of Contents

• Page 1: The PECO BACnet T8168B-2 thermostat is intended for commercial and residential environments. It supports both programmable and non-programmable operation. Key features include BACnet IP or MS/TP connectivity, auto-changeover, and optional remote sensor. Read these instructions carefully before attempting to install, operate, or service this thermostat. Failure to observe safety information could result in personal injury, death, and/or property damage. The PECO Performance PRO T8168 applications include fan coil, PTAC, and conventional systems with a single, multi-speed, or 0-10 VDC fan. Retain these instructions for future reference. This product, when installed, will be part of an engineered system whose specifications and performance characteristics are not designed or controlled by PECO. Select an appropriate thermostat location about four feet above the floor on a wall with good ventilation and average temperature. Do not locate the thermostat where it can be affected by direct sunlight, drafts, or radiating heat from appliances. Required components include screws and wall anchors. Disconnect power before beginning installation. Temperature control range is 50° to 90° F. Operating temperature is 0° to 120°F. Operating humidity is 5% to 95% RH, non-condensing. Physical dimensions are 4.3” H x 5.7” W x 1.3” D.
• Page 2: Part I: Install wall plate Position the wall plate on the wall with the directional arrow pointing up and terminal blocks facing outward. Use a level to determine the best horizontal wall plate mounting position. Drill holes at pencil-marked locations and insert the wall anchors. Mount the wall plate onto the wall and insert screws through mounting holes. Cap off any unused wires and terminate properly according to local building codes. Part II: Attach wires to thermostat wall plate Select the terminal designations that correspond to the system type. Using a small flathead screwdriver, loosen the screws on the terminal blocks. Assure that no uninsulated wires are exposed. Part V: Set clock, month, and day When power is first applied to the thermostat, it will activate the clock display. Setting the clock can also be accessed by selecting MORE then CLOCK. Part VI: Verify thermostat operation with system tests System test verification is highly recommended to verify thermostat operation. Press Next to continue to the following system test or next available Service Menu. Part III: Connect power to the thermostat wall plate The T8168 operates on 24VAC power. Remove insulator tab after power is applied.
• Page 3: Thermostat programming Fan coil 2-pipe/4-pipe operation This thermostat is easily changed from non-programmable to programmable operation in Service Menu 100. In non-programmable mode, the thermostat controls to a single setpoint with the dead-band used for auto changeover from heat to cool. Service Menu 171 sets 2-pipe or 4-pipe fan coil operation. 2-pipe operation disables W1 and WD outputs. Y1 and YD are used for first stage of cool in summer and first stage of heat in winter. 4-pipe operation uses both first stage cool (Y1 & YD) and first stage heat (W1 & WD) when chilled water is available. The T8168 offers either ON-OFF or 0-10 VDC fan operation. With a pipe sensor connected to the T8168, the system will automatically change from summer to winter operation based on water temperature. Programmable fan operation changes the fan operation to ON during scheduled occupied events. The keypad lockout function blocks access to features by hiding them from the user’s view/selectability.
• Page 4: Advanced configuration service menus require verification for specific applications. Commonly configured service menus include SM 100 for programmable options, SM 110 for system type, and SM 112 for fan type. Service menu access involves holding specific keys and navigating through options. The schedule format can be set to nonprogrammable or various programmable modes. Daylight savings time follows the US 2007 format when enabled. System types may affect the availability of certain service menus. Error detection and notification settings can be configured in service menu 175. Damper configuration options include continuous operation or cycling with demand. Different system configurations are available, including single and multi-stage heating and cooling options. Additional configuration may be required based on specific system needs.
• Page 5: System fan type options include on/off fan, user-selected speed, and proportional fan control. Fan ramping duration can be set from 0 to 3 minutes in 30-second increments. Valve stroke time can be adjusted from 30 seconds to 5 minutes. Fan control settings determine whether the thermostat activates the fan with heating demand. Output configurations for digital cooling and heating can be set to 0-10VDC or 4-20mA DC. GD output configuration allows for fan output settings of 0-10VDC or 4-20mA DC. Max voltage settings for heating and cooling demand can be adjusted between specified ranges. W1 output configuration can be set for normally closed or normally open operation. Remote sensor input options include disabling remote sensing or averaging local and remote sensor readings. Pipe sensor thresholds for cooling and heating can be set to specific temperature ranges.
• Page 6: Range High The highest selectable temperature setpoint value. Setback Low Accessed from Wi-Fi or by occupancy sensor detection. Zone Temperature offset adjusts the sensed Zone Temperature displayed, allowing calibration in the field. Keypad Lockout blocks access to certain features of the device. Enable Pin Access applies a 3-digit access code to enter service menu. Fan Mode options include ON, Auto, and Staged Only. System Mode sets the system modes the occupant is able to select. Flush Duration defines how long to open the valve to perform the flush function. Minimum Dead-band adjustment prevents short cycling between heating and cooling modes. Temporary Occupied Duration Limit sets the duration of a user override for programmable operation.
• Page 7: Default display icons include time, temperature, and setpoint options. Setpoint will not be displayed if the system mode is off. Factory default reset will return the device to factory settings. Cooling system output can be tested for 10 minutes. Heating system output can also be tested for 10 minutes. Fan system output test will activate based on service menu settings. Troubleshooting section provides potential causes and solutions for common issues. If the display screen is blank, check power and wiring. If keys do not allow manual entry, check for keypad lockout. Demand indicator light colors indicate system status, with red for heating and green for cooling.
• Page 8: Typical ON-OFF operation Typical three-wire floating operation The T8168B-2 thermostat is equipped with BACnet® IP or MS/TP wired connections. This thermostat will broadcast a Wi-Fi network on power up. Select this network and enter Password: 12345678, then press connect. Sign-In to open the BACnet configuration page at IP Address 10.10.0.1 on the T8168XXXX network. Recommended wiring specification: 22 -24 AWG shielded twisted pair, low capacitance. Care must be taken to ensure that the communication wiring does not touch the shield/ground. Do not connect the shield/ground to earth ground or the controller's power ground. This controller does not have an EOL termination or biasing.