Pentax TH8110R, TH8320, TH8320R, TH8321, TH8321R Specification Sheet

68-3105-01

RedLINK™ VisionPRO® Programmable
Commercial Thermostat

FOR MULTISTAGE CONVENTIONAL
AND HEAT PUMP SYSTEMS

GUIDE SPECIFICATION

OVERVIEW

RedLINK VisionPRO is a 7 day programmable thermostat with auto changeover that is designed for single stage and multistage
control of conventional and heat pump equipment such as rooftop units and split systems. RedLINK VisionPRO can be used with
or without an equipment interface module. The thermostat and equipment interface Module communicate using Honeywell's
proprietary RedLINK wireless technology. The thermostat controls up to 3 heat / 4 cool conventional systems and up to 4 heat / 2
cool heat pump systems. The thermostat controls humidification, dehumidification, ventilation, an economizer and a lighting
panel. Universal sensor inputs are used with remote indoor air temperature sensor(s), 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 is equipped with a touchscreen display with a 2 line message center.

Provides a microSD card port to upload Dealer Information, Custom Reminders, Custom Event Schedules, Holiday Schedule
and Software Updates and to download Data Logs.

Provides remote access to the thermostat when used with the RedLINK internet gateway.

Provides control using optional remote temperature and humidity sensors.

Thermostat 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

The heating and cooling setpoints shall be individually adjustable in the program schedule. The thermostat shall have a minimum
deadband of 2 F (no mechanical heating or cooling shall operate within this deadband). Space temperature deviation above the
cooling setpoint or below the heating setpoint shall generate a demand signal to control the system as follows:

Heating

The thermostat shall control the heating output based on the demand signal communicated from the thermostat program, taking
into account both space temperature deviation (proportional gain) and the duration of that temperature deviation (integral gain).

The thermostat shall energize heating equipment when space temperature falls below the heating setpoint.

The thermostat shall have a 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 will use backup heat as
needed to maintain the setpoint within +/- 1 F. When the backup heat droop is set to 2 F or higher and the backup heat upstage
timer is turned on, the indoor temperature must drop to the backup heat droop setting or the backup heat upstage timer must
expire before turning on the backup heat.

REDLINK™ VISIONPRO® PROGRAMMABLE COMMERCIAL THERMOSTAT

Cooling

The thermostat shall control the cooling output based on the demand signal communicated from the thermostat program, taking
into account both space temperature deviation (proportional gain) and the duration of that temperature deviation (integral gain).

The thermostat shall energize cooling equipment when space temperature exceeds the cooling setpoint.

(Optional Remote Equipment) A solid state enthalpy changeover control shall determine the capability of the outdoor air to
provide free cooling (optional). The system shall operate as follows:

Free cooling available from Outdoor Air: On a call for cooling, the system shall enable the economizer to provide free cooling.
If this does not meet the space demand, the system shall call for mechanical cooling to satisfy the programmed setpoint.

Free Cooling Not Available from Outdoor Air: On a call for cooling, the system shall hold the economizer to minimum position
and cooling shall be energized to satisfy the programmed setpoint.

Dehumidification

The thermostat shall control to the desired dehumidification level using one of the methods below:

Control dehumidification using a dehumidifier.

Control dehumidification by over cooling 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) shall be connected to the economizer's
power circuit or the Occupied/Unoccupied signal terminal.

Occupied Period: The auxiliary output will provide 24 VAC, allowing the economizer to operate normally and be available for
free cooling if outdoor conditions permit.

Unoccupied Periods: The auxiliary output will cease, defeating either economizer operation or the minimum position.

Heating and Cooling Schedule

Initiation of heating setback or cooling setup for each of 7 days shall be provided by a programmed time schedule manually
entered into the thermostat. The thermostat shall provide two occupied and two unoccupied periods per day. When all or a
portion of a manually programmed schedule is unavailable, the thermostat shall control to the default program schedule.

The thermostat shall provide adjustable recovery ramps for heating and cooling. The thermostat will begin heating or cooling
recovery early to ensure that the temperature is reached at the scheduled time.

The thermostat requires the current time to be set to follow the user's desired program schedule. The thermostat will
automatically update the current time for Day Light Saving time if this option is turned on.

Fan Operation

Fan Operation shall be selectable as follows:

On: Fan is always on.

Auto: Fan runs only when the heating or cooling system is on.

Follow Schedule: Fan controlled by the program schedule. The thermostat will turn on the fan 1-3 hours before the Occupied
period when the Pre-Occupancy Purge setting is turned on.

Power Interruption

On loss of power, the thermostat shall maintain programmed times and temperatures for 10 years.

Current time and date shall be maintained for a minimum of 4 years assuming 2 weeks of power outages each year.

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