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PELICAN
Model: PEARL
Advanced Controller (Thermostat Accessory)
Installation Guide
Before you start
Before beginning the installation, review all instructions to avoid issues
during installation. The PEARL is designed for 24V AC systems only and
should be installed by a licensed professional.
A Pelican Thermostat and Gateway are required for operation, and in certain
applications, a PEARL (PEM-VDC) Expansion Module may be used to increase
the number of PEARL DC voltage outputs. If you are uncertain about these
devices or their requirements for your project, please stop your installation
and contact Pelican Technical Support for guidance.
What is the PEARL?
The PEARL is a field-installed Pelican thermostat accessory the provides
advanced control of various HVAC systems. Common applications include:
Outside Damper Control (Ventilation & Economizer)
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Supply Fan Control (Single Zone Variable Air Volume)
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Modulating Heating (Hot Water, Steam, Gas, or Electric)
Modulating Cooling (Chilled Water and Compressor)
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External Temperature Inputs
For other applications like zone damper or reheat control, refer to the Zone
Damper Control manual or contact Pelican engineering support.
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Table of Contents
Related Manuals for Pelican PEARL
Summary of Contents for Pelican PEARL
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Page 1: Before You Start
A Pelican Thermostat and Gateway are required for operation, and in certain applications, a PEARL (PEM-VDC) Expansion Module may be used to increase the number of PEARL DC voltage outputs. If you are uncertain about these devices or their requirements for your project, please stop your installation and contact Pelican Technical Support for guidance. -
Page 2: How Does The Pearl Work
How does the PEARL work? The PEARL is installed near the equipment it controls and connects to a Pelican thermostat using a 3-wire power and communication line, supporting a one-to-one pairing. The PEARL provides modulating outputs, temperature inputs, and a single binary output, which increases a Pelican Thermostat’s equipment control capabilities. -
Page 3: Dimensions & Specifications
Dimensions 5.2 in. 142 mm ???? in. ??? mm ?? in. ??? mm 3.6 in. 91.4 mm Specifications ◦ Power: 24 VAC, 60 Hz, 50 mA ◦ Operating Voltages: 23 — 30 VAC ◦ Number of Binary Outputs: One (1) ◦... -
Page 4: Installation Planning
Plan installation based on HVAC design - Page 7. Disconnect power for safety & Choose a mounting location- Page 9. Mount and Wire the PEARL to Thermostat - Page 11. Wire PEARL to HVAC equipment - Page 15. Install and connect temperature probes - Page 33. -
Page 5: Table Of Contents
Table of Contents Before You Start What is the PEARL? How does the PEARL work? Included Parts Dimensions & Specifications Installation Planning Economizer Damper Control Single Zone Variable Air Volume Control Modulating Heating & Cooling Control Modulating VAV Box & Reheat Coil Control Turn Off... - Page 6 Table of Contents Diagram 10: Variable Heat Diagram 11: Variable Cool Diagram 12: Variable Heat & Cool Diagram 13: Exhaust Fan Enable/Disable Diagram 14: ERV/CRV Enable/Disable Notes Wiring - External Inputs Diagram 15: Supply Temperature Sensor Diagram 16: Outside Temperature Sensor Diagram 17: Return Temperature Sensor Diagram 18: Wall Mounted Temperature Sensor Diagram 19: Dry-Contact Occupancy Sensor...
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Page 7: Economizer Damper Control
Single Zone Variable Air Volume Control For variable speed fan control, the air handler will need a fan that accepts a 0-10V DC control input. The PEARL adjusts the fan speed across five configurations to manage airflow based on different heating, cooling, and ventilation sequences. -
Page 8: Modulating Heating & Cooling Control
Modulating Heating and Cooling Control For equipment with modulating heating and cooling, the PEARL adjusts outputs to maintain target discharge air temperatures. As heating or cooling demands change, the PEARL controls these elements to ensure comfort and energy efficiency. MODULATING COOLING COIL... -
Page 9: Turn Off Power & Mounting
PEARL. Confirm at least three wires are available between the PEARL and its Pelican thermostat. Verify a 24 VAC power source is accessible. Important: The PEARL is not waterproof. Mount it in a moisture-free location. Pelican PEARL Control Board Use sheet... -
Page 10: Wiring
Terminal Block Designations 24 VAC Power Common (All commons are internally connected) Data Configurable 0 [2] - 10 Vdc Output: Modulate outside air damper or, Modulate hot water or chilled water valve or, Modulate mechanical compressor or gas valve. Configurable 0 [2] - 10 Vdc Output: Modulate variable speed supply fan or, Modulate hot water or chilled water valve or, Modulate mechanical compressor or gas valve. -
Page 11: Wire Pearl To Pelican Thermostat
Wiring the PEARL to a Pelican Thermostat To connect a PEARL to its Pelican thermostat, at least three (3) wires are needed (unshielded wire is acceptable), supporting a maximum distance of 500 feet. Run the wires from the PEARL to the thermostat location and connect the (R), (C), and (D) terminals on the PEARL to the corresponding terminals on the thermostat’s back plate. - Page 12 HVAC control board. Follow the Thermostat Installation manual for most common HVAC equipment control outputs. Pelican PEARL Low Voltage Terminals Do not wire multiple wires into any Pelican terminals. Use wire nuts where required. We recommended using 18G thermostat wire.
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Page 13: Optional: Limited Wiring Applications
Optional: Limited Wiring Applications In installations where there are limited wires between the thermostat and the PEARL, Pelican includes a Limited Wiring Module inside each thermostat, allowing full HVAC control without running additional wire. Step 1: Remove the Wiring Wiring Module Module from the Pelican Thermostat’s Back Plate... - Page 14 Step 3: Mount & Wire PEARL to its thermostat Securely mount the PEARL inside the HVAC equipment's low voltage cavity. Use existing or new 18-gauge wire to connect the PEARL's power and communication terminals to the corresponding terminals on the Pelican thermostat.
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Page 15: Application Wiring Diagrams
Application Wiring Diagrams The PEARL supports various modulating control applications. This section includes wiring diagrams for the most common applications. For thermostat control output diagrams, see the Thermostat Installation manual. Page 16 Rooftop Equipment’s 24V AC Transformer Power Option 1... -
Page 16: Power Option 1: Rooftop Equipment 24 Vac Transformer
PEARL/thermostat’s operating range of 23 - 30V AC. Turn power back OFF to the rooftop equipment. Wire the PEARL & thermostat’s (R) to 24V AC and (C) to Common at the rooftop equipment. Pelican PEARL... -
Page 17: Power Option 2: Auxiliary 24 Vac Transformer
ON to the transformer and verified the voltage measured is within the thermostat’s operating range of 23 - 30V AC. Turn power back OFF to the transformer. Wire the PEARL & thermostat’s (R) to 24V AC and (C) to Common at the transformer. 24V AC... -
Page 18: Diagram 1: Modulating Economizer Damper
Diagram 1: Modulating Economizer Damper... -
Page 19: Diagram 2: Variable Speed Fan
Diagram 2: Variable Speed Fan... -
Page 20: Diagram 3: Modulating Outside Damper & Variable Speed Fan
Diagram 3: Modulating Outside Damper & Variable Speed Fan... -
Page 21: Diagram 4: Modulating Outside Damper & Variable Heat
Diagram 4: Modulating Outside Damper & Variable Heat... -
Page 22: Diagram 5: Modulating Outside Damper & Variable Cool
Diagram 5: Modulating Outside Damper & Variable Cool... -
Page 23: Diagram 6: Modulating Outside Damper & Variable Heat & Cool
Diagram 6: Modulating Outside Damper & Variable Heat & Cool... -
Page 24: Diagram 7: Variable Speed Fan & Variable Heat
Diagram 7: Variable Speed Fan & Variable Heat... -
Page 25: Diagram 8: Variable Speed Fan & Variable Cool
Diagram 8: Variable Speed Fan & Variable Cool... -
Page 26: Diagram 9: Variable Speed Fan & Variable Heat & Cool
Diagram 9: Variable Speed Fan & Variable Heat & Cool... -
Page 27: Diagram 10: Variable Heat
Diagram 10: Variable Heat... -
Page 28: Diagram 11: Variable Cool
Diagram 11: Variable Cool... -
Page 29: Diagram 12: Variable Heat & Cool
Diagram 12: Variable Heat & Cool... -
Page 30: Diagram 13: Exhaust Fan Enable/Disable
Diagram 13: Exhaust Fan Enable/Disable... -
Page 31: Diagram 14: Erv/Crv Enable/Disable
Diagram 14: ERV/CRV Enable/Disable... -
Page 32: Notes
CO2) sequence is active. [R] [C] [D] power & communication terminals shall be wired between the PEARL and its thermostat with a max 500 feet distance; as shown on page 10. Outside Damper Control Output: Configurable 0[2] – 10 Vdc range. -
Page 33: Wiring - External Inputs
Wiring - External Inputs The PEARL can accept up to three inputs, which can be either external 10K Type 2 temperature thermistors or a dry-contact. This section provides wiring diagrams for the most common applications. Page 33 Supply Temperature Sensor Diagram 15 Required: Economizer &... -
Page 34: Diagram 16: Outside Temperature Sensor
Step 2: Insert the probe into the return duct. Step 3: Run or use existing 2-18G thermostat wire to connect the probe to the [T2] terminal on the PEARL. Maximum wire length: 100 feet. For runs longer than 50 feet or in areas with electrical... -
Page 35: Diagram 18: Wall Mounted Temperature Sensor
Diagram 18: Wall Mounted Temperature Sensor IMPORTANT: In this application, as with all PEARL installations, a Pelican Thermostat is required. Step 1: Mount the 10K Type 2 sensor on the wall or in the desired room to serve as the thermostat’s temperature sensor. -
Page 36: Diagram 20: Dry-Contact Alarm
2-wire twisted pair and ground the wire at one end. ◦ The [T] terminals are universal and can be configured for specific applications through the Pelican web app. The diagram indicates the most commonly used terminal for each application. -
Page 37: Start-Up: Turn On Power
Incorrect connections may cause damage. Start-Up: LED Lights Confirm Power & Communication Status: The PEARL’s left status light [1] will blink green slowly to indicate power and synchronization with the thermostat. Once synchronized, the left status light [1] will turn solid green. -
Page 38: Indicator Status Lights
Normal Operation The PEARL has power and it is communicating with the thermostat. Solid Off No Power The PEARL has no power. Check the [R] and [C] terminals for 24 VAC. Check the power Off Off source for 24 VAC. Connecting... -
Page 39: Configurations
The PEARL is configured using the the Pelican Connect™ web-app. On the web-app, the PEARL is considered an accessory to its Pelican thermostat. To configure the PEARL, log into the web-app and navigate to the thermostat it is wired to’s configuration page: Step 1 : Select Admin. - Page 40 Step 3: Select the Thermostat the PEARL is wired to. Quick Tip: If you have multiple thermostats, you can quickly locate a specific thermostat by selecting the search icon in the upper right-hand corner and entering the thermostat’s name or serial number.
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Page 41: Economizer & Ventilation
Auto Configure - This applies the default (D) economizer configurations to all settings except for Damper Voltages. The Damper Voltages are set separately using the PEARL’s Test & Calibration function, which is detailed on page 51. High Limit Shut Off - Disables the economizer if Auto the outside air temperature exceeds the set limit. - Page 42 Economizer and Ventilation Configurations Configuration Name/Description Settings/Range Damper Voltages - Defines the voltage range for Open: (D) 10.0V DC fully open and fully closed positions of the outside 0.0 to 10.0 damper. Proper calibration (see Auto Calibration Closed: (D) 2.0V DC on page 10) ensures accurate damper operation, 0.0 to 10.0 adjusting outside air intake in response to control...
- Page 43 56°F air temperature during economizer operation. 0°F to 180°F When the system starts, the PEARL calculates an outside damper position to maintain this low limit based on the difference between the outside and room temperature. If the mixed air temperature...
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Page 44: Variable Speed Fan
Variable Speed Fan Configurations By default, Variable Speed Fan is set to “Off”. To enable multiple fan speed options and access further configurations, switch Variable Speed Fan to "On." Note: The available fan speed configurations will automatically adjust based on the number of heating and cooling stages set in the thermostat. For instance, with one heating stage and two cooling stages, four fan speeds will be available: Cool Fan Speed, Cooling Speed - Stage 2, Heating Fan Speed, and Ventilation Fan Speed. -
Page 45: Variable Temperature Control
Variable Temperature (Advanced Configurations) These configurations affect modulating heating and cooling sequences. Advanced configurations have limited access. Contact Pelican Technical Support for further assistance. Configuration Name/Description Settings/Range Type - Configures which modulating sequences are None active. This option specify the sequences that the... - Page 46 Variable Temperature (Advanced Configurations) Configuration Name/Description Settings/Range Moderate Heat Target – Specifies the target 100°F supply temperature for moderate cooling. This -22°F to 180°F setting ensures that the cooling system maintains a baseline temperature during minimum thermostat heating cycles. Aggressive Heat Target – Sets the maximum 115°F target supply temperature for aggressive heating.
- Page 47 Note: Outputs A3 and A4 become available if the PEARL expansion module (sold separately) is installed. Cool Always Active – When enabled, the controller will continuously modulate the Cool source to maintain the moderate cooling target.
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Page 48: Input Configurations
S1 will automatically correlate with the economizer feedback terminal. S1 & S2 provide some advanced configurations options which can be used by Pelican Application Engineers and are project specific. Temperature Configuration Definitions: Temperature – Identifies the input as an additional room or zone sensor. - Page 49 Input Configurations Alarm – When an input is set for Alarm, it becomes a dry-contact input. Additional configurations become available to define when this alarm is active: Always - If the dry-contact changes states, a notification will be ◦ generated. ◦...
- Page 50 Input Configurations Input Sensor T2 When set to ON, this input can be configured for any of the following: Configuration Name/Description Settings/Range Function – Sets what function this input will Return Temperature be used for. Temperature Temp Monitor Supply Temperature Outside Temperature Alarm Occupancy Sensor...
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Page 51: Economizer Test & Calibration
Overview: To test and calibrate the economizer actuator voltage ranges configured at the PEARL, the PEARL must be wired to control the outside damper with the [A1] output, and the actuator must provide a feedback voltage on the [S1] input. It is important to visually observe the damper rotating during the Test &... - Page 52 Economizer Test & Calibration pressing the “MOVE” button on the PEARL or the “REVERSE” button on the Pelican web app will switch the controller to output 10 Vdc as the Close position. Open Damper Position Calibration: Once the closed position is verified, the left STATUS light flashes green quickly, and the right...
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Page 53: Signal Outputs
Analog output sliders will only allow for manual control if the modulation logic linked to that output is disabled. If modulation logic is enabled, the slider might move temporarily, but the PEARL will ignore the change within a few minutes. - Page 54 intentionally left blank...
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- Page 56 PELICAN Website: www.pelicanwireless.com Pelican Wireless Systems. All Rights Reserved. Phone: 888.512.0490 PEARL 37-0004 REV 05...
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