THM303A - UPM BRAND - ENGLISH MANUAL Thermostat contols 24V millivolt furnaces and air conditioners. NOTE: This thermostat is NOT compatible with baseboards or any 120V or 240V high voltage control system.
TABLE OF CONTENTS Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Compatibility chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 INSTALLATION GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Introduction . . . . . . . . . . . . .
TABLE OF CONTENTS Temporary override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Hold function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Check programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FEATURES Extra Large LCD display with backlight Real-time clock with selectable 12 or 24 hour display format l 5+1+1 Day Programming with 4 programs per day l Separate Heat / Cool programs with built-in protection for the air-conditioner compressor l Display and set temperature in °C or °F l Display of relative humidity in % l Interface with heating or air-conditioning systems for automatic temperature control l Interface with humidifier for automatic humidity control (THM303A only) l Low battery notificati
THM303A Open the thermostat by gently pulling the front of the thermostat away from the backplate. This thermostat requires two AA size batteries (included) to operate. Ensure the batteries are installed. l Select °C or °F before clock setting and programming.
COMPATIBILITY CHART Generally, equipment with low voltage control is compatible with this thermostat. For details on compatibility of your particular equipment, please call our technical assistance line.
Installation Guide 7
INSTALLATION GUIDE INTRODUCTION This thermostat can replace common residential thermostats and it is designed for use with most electric, oil or gas heating and air-conditioning systems that use low voltage control. Please see compatibility chart for more details. Weekday / Saturday / Sunday programming with 4 programs per day. Display temperature with 0.1°. l Built-in protection timing for the air-conditioner compressor.
The following tools may be required for installation: Hand Power Drill with a 3/16 inch bit Cross screwdriver ( If necessary, to drill holes on the wall ) Masking Tape (To wrap the exposed wires temporarily and labeling the disconnected wires) Level (If necessary, to level the thermostat) Wire Stripper/Cutter (If necessary, to strip the wires) Two AA size batteries (included) - AA SIZE + - AA SIZE + See below to select a suitable place for the new thermostat installation.
CHOOSING LOCATION FOR THE NEW THERMOSTAT Thermostat should be mounted: l l l Approximately 5 ft (1.5m) from floor. Near or in a frequently used room, preferably on an inside partitioning wall. On a section of wall without pipes or duct-work Thermostat should NOT be mounted: Near a window, on an outside wall, or next to a door leading outside. With exposure to direct light or heat from a lamp, sun, fireplace, or other temperature-radiating objects which may cause false readings.
REPLACING OLD THERMOSTAT 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. l TURN OFF POWER to system at the furnace, or at the fuse/circuit breaker panel.
MOUNTING THE THERMOSTAT BACK-COVER The back-cover should be mounted horizontally with the terminals on the left side. l Thread the existing wiring through the big center hole from the back and set the back-cover horizontally on the wall. l Select two appropriate mounting holes and mark the locations with a pencil. If necessary, use a level to make sure the thermostat is leveled. l Remove the back-cover from the wall and drill two 3/16 inch holes in the marked screw positions.
CONNECTING THE WIRES TO THE TERMINALS 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. Wall Through Hole Back-Cover Wall Depending on your heating/cooling equipment, you may need to connect 2 to 9 wires to the thermostat.
WIRING DIAGRAM 2-wire heating 4-wire heating/cooling H1 H2 G RC RH O B W Y H1 H2 G RC RH O B W Y JUMPER Heating Relay Fan Relay JUMPER Heating Relay Cooling Relay 3-wire heating 5-wire heating/cooling H1 H2 G RC RH O B W Y H1 H2 G RC RH O B W Y Fan Relay JUMPER Optional Wiring Heating Relay 14 Cool Transformer Fan Relay Cool Damper Heat Damper Heating Relay Cooling Relay Heat Transformer
INSTALLING CONTROL WIRES FOR HUMIDIFIER CONTROL (THM303A 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'. l The original humidistat should be removed or set to 'OFF' position. l Noted: The 2 humidifier control terminals 'H1' and 'H2' are electrically isolated from the Heat / Cool terminals.
SETTING THE FAN OPERATION JUMPER Depending on your home's heating system, you may need to change the jumper setting for the fan operation. The jumper is located at the lower right-hand side of the back of the thermostat. l HG – Use this setting for gas or oil-fired furnaces. This setting allows the fan operation to be controlled by the heating system; not the thermostat. This is the correct setting for most systems. l HE – Use this setting for electric powered furnaces.
ATTACHING THE THERMOSTAT TO THE BACK-COVER 17
FUNCTION KEY DESCRIPTIONS LCD DISPLAY DISPLAY AHEAD PROGRAM UP SET CLOCK HOLD DOWN BACK FAN CONTROL HEAT/COOL CONTROL RESET USAGE 18
LCD DISPLAY AM/PM MODE CURENT TEMPERATURE TIME WEEKDAY SET/PROGRAM TEMPERATURE RELATIVE HUMIDITY PROGRAM SET TIME AND DAY Press SET CLOCK to start time setting. The time and SET symbol will flash. Use AHEAD or BACK to set the current time. l Press SET CLOCK again. The day and SET symbol will flash. l Use AHEAD or BACK to set the current day. l Press SET CLOCK again to exit.
PROGRAMMING PROGRAMS This thermostat is equipped with 5+1+1 day programming - separate programming for weekdays, Saturday and Sunday, with four settings per day. This thermostat is pre-programmed for your convenience or you can set your own programs as desired. PROGRAM 1: MORNING: this is typically for the morning when you may prefer a warmer temperature. PROGRAM 2: DAY: this is an energy-savings mode for the time you are away from home. The setting can be adjusted to minimize energy consumption.
Below is a Schedule of the Pre-programmed Time and Temperature Settings: PERIOD MORNING DAY EVENING NIGHT P P1 P2 P3 P4 TIME 6:00am 8:00am 5:00pm 10:00pm HEAT COOL SETPOINT SETPOINT 69.0 oF (20.5 oC) 63.5 oF (17.5 oC) 70.0 oF (21.0 oC) 62.5 oF (17.0 oC) 77.0 oF (25.0 oC) 84.0 oF (29.0 oC) 77.0 oF (25.0 oC) 79.0 oF (26.0 oC) HEATING PROGRAM 1- Slide the system switch to the HEAT position and press the PROG key once. The P1 and SET PROGRAM symbol will appear on the display.
After setting of all 12 programs, press PROG again to will take you to humidity setting (see Humidifier Control) or press PROG twice to return to normal display. Note: The PROG key can also be used anytime to review all the set programs. To terminate the programming sequence at anytime, press DISPLAY key. Tip: Press and hold the AHEAD/BACK or UP/DOWN key to change the Numbers quickly.
COOLING PROGRAM Slide the system switch to the COOL position and repeat the programming as you would for the Heating programs. Note: The Humidifier Control (THM303A) only functions in HEAT mode. TEMPORARY OVERRIDE To change the temperature temporarily, press UP or DOWN to set the desired temperature. The OVERRIDE symbol will appear. The thermostat will return to the regular program at the next scheduled program time.
CHECK PROGRAMS The current program is displayed on the lower right-hand section of the LCD screen. l Press PROG anytime to scroll through and check all other programs. l current temperature ROOM TEMPERATURE l current program Current temperature is displayed on the mid-section of the LCD screen. RELATIVE HUMIDITY l Relative humidity is displayed on the left-hand section of the LCD screen.
l l Use UP or DOWN to set the humidity level in increments of 5%. Press PROG to exit. The humidifier will turn on if the room humidity is lower than the set humidity level. Humidity level can be set from 20% to 70%. Note: The humidifier control only functions in HEAT mode. FAN CONTROL SWITCH For automatic control of the fan, set the Fan ON/AUTO switch to the AUTO position. In cooling, the fan starts/stops with the cooling equipment.
PRE-COMFORT RECOVERY 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. It is normal for the system to be activated earlier (up to ½ hour for heating and one hour for cooling) than the actual set program time. l The Pre-comfort Recovery can be disabled if desired. Please refer to Optional Settings.
FILTER CHANGE l The FILTER CHANGE indicator will display on the LCD screen when the system "ON" time (HEAT or COOL) has accumulated to approximately 500 hours. It is an indication that the filter should be changed at this time. To reset the FILTER CHANGE counter press and hold USAGE for 3 seconds until the momentarily. This brings the counter back to zero. appears OPTIONAL SETTINGS Below is the list of optional settings: - 12/24 Hour display format.
l Press SET CLOCK to move on to Pre-comfort Recovery ON/OFF and Backlight ON/OFF settings. - Choose from OP0 to OP3 by pressing UP or DOWN. See Chart 2. OP Options - Factory default is OP3 l l The backlight only comes ON in the dark. If the Backlight is ON (enabled), any key press will turn the backlight ON for 6 seconds in the "dark".
RESET If the thermostat shows an abnormal display or if you want to clear all existing programs, use a pointed object to press the 'R' key. Time and programs will need to be set again after a Reset. SPECIFICATIONS Number of Programs: 5+1+1 Day Programming with 4 programs per day Temperature display range: 0°C - 55°C (34°F - 99.
TROUBLESHOOTING GUIDE PROBLEM SOLUTION Display will not come on. 1) Check if the batteries are installed correctly. 2) Check if the batteries are fresh and the correct size. 3) Press the RESET button. Battery symbol ( Buzzer beeping. 1) Batteries are low. Replace with fresh batteries. ) is flashing. Air-conditioning will not come on (COOL symbol not flashing). 1) System switch is on the HEAT or OFF position. 2) Current temperature is lower than set temperature. Check current program.
TROUBLESHOOTING GUIDE PROBLEM SOLUTION Heating will not come on (HEAT symbol not flashing). 1) System switch is on the COOL or OFF position. 2) Current temperature is higher than set temperature. Check current program. Heating will not come on (HEAT symbol flashing). 1) Check if the furnace switch and/or pilot flame is turned on; it may have been turned off. 2) Allow some time for the heater to heat up and the fan to activate.
WARRANTY This product has a three (3) year warranty against defects in workmanship and materials. This product is not guaranteed against wear or breakage due to misuse and/or abuse. If the product is defective, - return it, with a dated proof of purchase, to the retailer from which you purchased it. Attention: IT IS STRONGLY RECOMMENDED TO HAVE A CERTIFIED ELECTRICIAN ON SITE TO ENSURE THE SAFE INSTALLATION OF YOUR THERMOSTAT.
