RedLINK™ VisionPRO Programmable Light Commercial Thermostat
FOR MULTISTAGE CONVENTIONAL AND HEAT PUMP SYSTEMS
GUIDE SPECIFICATION
OVERVIEW
RedLINK VisionPRO is a 7 day programmable thermostat with auto changeover designed for single stage and multistage control of conventional and heat pump equipment, such as rooftop units and split systems. It can be used with or without an equipment interface module. The thermostat and equipment interface module communicate using RedLINK wireless technology. The thermostat controls up to 3 heat / 4 cool conventional systems and up to 4 heat / 2 cool heat pump systems. It also controls humidification, dehumidification, ventilation, an economizer, and a lighting panel. Sensor inputs accommodate remote indoor air temperature sensors, an outdoor air temperature sensor, a discharge air temperature sensor, a return air temperature sensor, an occupancy sensor for remote setback, and dry contact devices for displaying alerts.
The thermostat features a touchscreen display with a 2-line message center. It includes a microSD card port for uploading Dealer Information, Custom Reminders, Custom Event Schedules, Holiday Schedules, and Software Updates, as well as for downloading Data Logs.
Remote access to the thermostat is provided when used with the RedLINK internet gateway. It offers control using optional remote temperature and humidity sensors and integrates with the Niagara-AX framework.
QUALITY ASSURANCE
The thermostat shall be manufactured within a certified ISO-9001 facility and is FCC Compliant with part 15 of the FCC rules.
SEQUENCE OF OPERATION
Heating and cooling setpoints are individually adjustable in the program schedule. The thermostat has a minimum deadband of 2°F (0°C), within which no mechanical heating or cooling operates. Space temperature deviation above the cooling setpoint or below the heating setpoint generates a demand signal to control the system.
Heating
The thermostat controls heating output based on the demand signal from the thermostat program, considering both space temperature deviation (proportional gain) and the duration of that deviation (integral gain). Heating equipment is energized when space temperature falls below the heating setpoint.
The thermostat includes compressor outdoor lockout and backup heat outdoor lockout to turn off the heat pump or backup heat based on outdoor temperature. When the backup heat droop is set to 'Comfort', the control algorithm uses backup heat as needed to maintain the setpoint within +/- 1°F. If the backup heat droop is set to 2°F or higher and the backup heat upstage timer is active, the indoor temperature must drop to the backup heat droop setting or the backup heat upstage timer must expire before backup heat is activated.
Cooling
The thermostat controls cooling output based on the demand signal from the thermostat program, considering both space temperature deviation (proportional gain) and the duration of that deviation (integral gain). Cooling equipment is energized when space temperature exceeds the cooling setpoint.
(Optional Remote Equipment)
A solid-state enthalpy changeover control determines the capability of outdoor air to provide free cooling. The system operates as follows:
- Free cooling available from Outdoor Air: On a call for cooling, the system enables the economizer for free cooling. If this does not meet the space demand, mechanical cooling is called to satisfy the programmed setpoint.
- Free Cooling Not Available from Outdoor Air: On a call for cooling, the economizer is held to a minimum position, and cooling is energized to satisfy the programmed setpoint.
Dehumidification
The thermostat controls to the desired dehumidification level using one of the following methods:
- Control dehumidification using a dehumidifier.
- Control dehumidification by overcooling and lowering the fan speed.
- Control dehumidification using reheat.
Economizer Interface
The auxiliary output of the thermostat or equipment interface module (A-L/A terminal) connects to the economizer's power circuit or the Occupied/Unoccupied signal terminal.
- Occupied Period: The auxiliary output provides 24 VAC, allowing the economizer to operate normally and be available for free cooling if outdoor conditions permit.
- Unoccupied Periods: The auxiliary output ceases, disabling either economizer operation or the minimum position.
Heating and Cooling Schedule
Heating setback or cooling setup for each of 7 days is initiated by a programmed time schedule manually entered into the thermostat. The thermostat provides two occupied and two unoccupied periods per day. If any part of the manually programmed schedule is unavailable, the thermostat reverts to the default program schedule.
Adjustable recovery ramps for heating and cooling are provided. The thermostat begins heating or cooling recovery early to ensure the target temperature is reached at the scheduled time.
The current time must be set correctly for the thermostat to follow the user's desired program schedule. The thermostat automatically updates the current time for Daylight Saving Time if this option is enabled.
Fan Operation
Fan Operation is selectable as follows:
- On: Fan is always on.
- Auto: Fan runs only when the heating or cooling system is on.
- Follow Schedule: Fan is controlled by the program schedule. The thermostat turns on the fan 1-3 hours before the Occupied period when the Pre-Occupancy Purge setting is enabled.
Power Interruption
On loss of power, the thermostat maintains programmed times and temperatures for 10 years. The current time and date are maintained for a minimum of 4 years, assuming 2 weeks of power outages annually.
Overrides
Temporary Override
After touching the OVERRIDE button from the Home Screen or adjusting the temperature setpoint, the thermostat uses a pre-set occupied temperature. The new temperature is maintained for 1 hour and can be adjusted up to the maximum override duration set by the installer.
Holiday Override
Selecting HOLIDAY MODE from the Menu allows the user to set setback temperatures from the current day to a specified date.
Holiday Schedule
Selecting HOLIDAY SCHEDULE from the Menu allows the user to set US or Canadian Holidays and Custom Events:
- US or Canadian Holidays: The thermostat allows customization of temperature settings for specified national holidays. Normal scheduling resumes between selected holidays.
- Custom Events: The thermostat allows customization of temperature settings for specific events. Up to 25 Custom Events can be set up for a specific date or a day of the month. Normal scheduling resumes after the event.
Initiate Occupancy
The thermostat maintains an energy-saving temperature level until the user touches "Press to Start Occupancy" on the home screen. The thermostat returns to the energy-saving level after the hold expires or the Occupied period ends.
Remote Setback using an Occupancy Sensor
(Requires the equipment interface module): During an Occupied Period, the thermostat overrides the program schedule and follows desired standby settings when the occupancy sensor detects the room is unoccupied. The thermostat resumes the program schedule when the occupancy sensor detects the room is occupied.
The thermostat provides three levels of keypad lockout to prevent changes: Unlocked, Partial Lockout, and Full Lockout.
The thermostat provides heating and cooling temperature range stops to limit temperature setpoint adjustments.
Reminders and Alarms
- The thermostat alerts the user when the HVAC filter requires replacement or cleaning.
- The thermostat alerts the user when maintenance is required on humidification, dehumidification, and ventilation equipment.
- The thermostat alerts the user when a problem is detected by a dry contact device connected to the sensor inputs (requires the equipment interface module).
- The thermostat alerts the user when service is required, based on Custom Reminders entered by the installer. Custom Reminders are displayed based on date or when the outdoor temperature exceeds a selected level.
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