The device described in this manual is a 7-Day Programmable Thermostat, specifically models ARTTP001S (SMS-1) and ARTTP002S (SHP-2), designed for Rooftop, Roomtop, and Large Split A/C systems. It is a solid-state, microcomputer-based temperature control system featuring advanced technology in a low-profile designer case.
Function Description:
The ARTTP Programmable Thermostat controls heating and air conditioning equipment. It allows users to program temperature setpoints for up to 7 days, with options for 2 or 4 events per day (Morning, Day, Evening, Night). The thermostat includes a "Progressive Recovery" feature, which anticipates programmed setpoint changes to ensure the desired temperature is reached by the scheduled time. It supports both single-stage and multi-stage heating or cooling systems, selectable via DIP switches. The device can operate in Heat, Cool, Auto Changeover, or Off modes. Auto Changeover mode automatically switches between heating and cooling based on established temperature setpoints. It also offers auto or manual fan operation.
The thermostat is designed to be user-friendly with "Ultra-Touch" controls and an easy-to-read, full-function Liquid Crystal Display (LCD). It can display temperatures in either Fahrenheit or Celsius and supports both 12-hour and 24-hour clock formats.
Remote sensing capabilities are a key feature, allowing the connection of up to six indoor sensors, duct sensors, and one outdoor sensor. These sensors can be daisy-chained to provide temperature averaging in large areas or multiple zones. For heat pump applications, the ARTTP002S model can use an outdoor sensor to control balance points, disabling auxiliary heat during warm weather and locking out the compressor when outdoor temperature is too cold, thereby optimizing energy efficiency.
Important Technical Specifications:
- Rated Voltage: 20-30 Vac, or DC 24V nominal.
- Rated A.C. Current: 0.05 Amps to 0.75 Amps continuous per output, with surges to 3 Amp max.
- Rated D.C. Current: 0 Amps to 0.75 Amps continuous per output, with surges to 3 Amp max.
- Control Range: Heating: 5 to 30°C (1°C steps); Cooling: 16 to 40°C (1°C steps).
- Thermostat Measurement Range: 0 to 48°C.
- O.D.T. Measurement Range: -48 to 48°C.
- Control Accuracy: ± 0.5°C at 20°C.
- Minimum Deadband: 1°C between heating and cooling.
- Remote Sensor Cable Length: Max 300 ft (90m) between any 2 units.
- Max Number of Indoor Sensors: 6 in daisy chain.
- Max Number of Duct Sensors: 1 in daisy chain.
- Max Number of Outdoor Sensors: 1 in daisy chain.
- Outdoor Sensor Accuracy: +/-2°C from -20 to 30°C after 30 minutes of continuous operation.
Usage Features:
- 7-Day Programming: Allows for detailed scheduling of temperature setpoints across all seven days of the week.
- 2 or 4 Events Per Day: Users can choose between a simpler 2-event schedule (Day/Night) or a more detailed 4-event schedule (Morning/Day/Evening/Night) via DIP switch settings.
- No Batteries Required: The thermostat retains scheduled events and temperatures without batteries, ensuring settings are remembered even after power failures. The internal clock maintains time for up to 2 hours during a power outage; if power is not restored within this period, the clock defaults to 12:00 AM, and the thermostat holds the Night program until the clock is reset.
- Temporary Temperature Override: Allows temporary adjustment of the scheduled program temperature for a 3-hour period without affecting the overall program. If the keyboard is locked, the override period is 1 hour.
- Constant Override (Hold): Maintains a selected temperature indefinitely until manually cancelled by pressing the RESUME button.
- Keyboard Lockout: A tamper-proof electronic keyboard lockout feature can be enabled via DIP switch to prevent unauthorized changes.
- Thermostat and Sensor Calibration: Easy calibration of the thermostat and remote sensors by pressing and holding the FAN button for 10 seconds and adjusting with the up/down buttons.
- Programming Revert Time Extended: The time before the thermostat reverts to the normal display after programming has been extended to 2 minutes.
- Push Button Auto Repeat: Simplifies programming by allowing buttons to be held down for continuous adjustment.
- Viewing Outdoor Temperature: If an outdoor remote sensor is installed, the outdoor temperature can be viewed by pressing and holding the OUTDOOR button.
- Heat Pump Balance Points (ARTTP002S only): Allows setting high and low balance points to optimize heat pump operation by controlling when auxiliary heat is used or when the compressor is locked out based on outdoor temperature.
Maintenance Features:
- Built-in Short Cycle Equipment Protection: Protects the heating and cooling equipment from frequent cycling.
- Computerized Heat Anticipation and Cooling Droop: Enhances comfort and efficiency by intelligently managing heating and cooling cycles.
- LED Icons for Dirty Filters and Compressor Fault: Provides visual indicators (LED1 and LED2 icons) on the LCD for maintenance alerts such as dirty filters or a compressor fault, selectable via DIP switches.
- Troubleshooting Guide: The manual provides guidance for common issues such as "no display," "AC" display, "very high/low temperature" readings, and erratic temperature displays, often related to wiring or sensor issues.
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