Programmable Thermostat THM302M THM303M
A) ATTACH THERMOSTAT B) ATTACH COVER Features: Back-Cover + + + + + + + - + + - SNAP HINGES AT BOTTOM EDGE Extra Large LCD display with backlight Real-time clock with selectable 12 or 24 hour display format 5+1+1 Day Programming with 4 programs per day Separate Heat/Cool programs with built-in protection for the air-conditioner compressor Display and set temperature in °C or °F Display of relative humidity in % Interface with heating or air-conditioning systems for automatic temperature control Inte
INSTALLING THE BATTERY SELECT °C / °F display Function Key Descriptions Install the two AA size batteries (included) to the thermostat following the polarity as marked. The LCD display will show the room temperature flashing in Celsius. Press UP or DOWN to change the temperature display between °C and °F. Press SET CLOCK, and the thermostat would go to clock setting / normal display. Note: This is a one-time process.
Installing control wires for humidifier control (THM303M only) If control of the humidifier is desired, the 2 wires connecting the original humidistat needs to be connected to the 2 terminals marked 'H1' and 'H2' on the THM303M. The original humidistat should be removed or set to 'OFF' position. Noted: The 2 humidifier control terminals 'H1' and 'H2' are electrically isolated from the Heat / Cool terminals.
Connecting The Wires To The Terminals Wall Connect the previously labeled wires to the corresponding terminals, matching the designations. Use a screwdriver to securely fasten the wires onto the terminals. Make sure the wires do not short-circuit with other terminals. Through Hole Back-Cover Wall Depending on your heating/cooling equipment, you may need to connect 2 to 9 wires to the thermostat.
Replacing Old Thermostat Check Programs Note: Do not operate the cooling system when outside temperature is below 10°C (50°F) to avoid damaging the compressor. Test the system to make sure that your heating and cooling are working properly before installation. If either does not work, contact your local heating/air-conditioning dealer to fix the problem before installation. TURN OFF POWER to system at the furnace, or at the fuse/circuit breaker panel.
Installation Pre-Comfort Recovery The following tools may be required for installation: This thermostat is equipped with a ‘Pre-Comfort Recovery’ system that will activate the heating or cooling in advance of the actual set program time so that the room will be at the desired temperature at the start of the comfort program time.
THM302M / THM303M Installation Guide Changing Batteries When the battery symbol on the LCD display flashes, it indicates that the batteries are running low and have to be replaced. However, it is recommended for the batteries to be replaced every year even if the indicator is not flashing yet.
