® PROGRAMMABLE THERMOSTAT THM501
LEAVE BLANK
Features: Extra-large LCD display with backlight — sets and displays house temperature (°C or °F), day, hour and minute (in 12- or 24-hour format) Temperature can be set in half degrees Interfaces with humidifier for automatic humidity control Interfaces with heating/air conditioning systems for automatic temperature control Automatic change-over for HEATING/COOLING programs Copy 1 day’s program to another day Automatic ventilation Selectable cycle rate Usage monitor Filter change reminder Millivolt & 24 V
** IMPORTANT - Getting Started ** This thermostat requires 2 “AA” size batteries (included) to operate. Ensure the batteries are installed correctly. (REFER TO PAGE 31). Once the batteries are installed for the first time, we recommend that you perform a HARD RESET to set the thermostat to its default settings. To do so, 1 First, press and hold the LOCK key. 2 While holding down the LOCK key, press and release the RESET (R) key located above the battery compartment on the back.
** IMPORTANT - Getting Started ** It is VERY IMPORTANT you choose your desired choice of Celsius (°C) or Fahrenheit (°F) before you proceed with the clock and program setting, as this is a one-time setup process. The temperature scale (°C or °F) CANNOT be changed afterwards unless you perform another HARD RESET on the thermostat. (REFER TO PAGES 17 and 31). RESET (R) key X Pull apart firmly to remove the back cover from the thermostat. DO NOT try to pry open with a screwdriver.
Function Key Descriptions AHEAD USAGE PROGRAM MODE SET CLOCK HOME OPTION HOLD BACK UP DOWN FAN LOCK COPY WEEKDAY 4
LCD Display OVERRIDE INDICATION FILTER CHANGE INDICATION CURRENT (ROOM) TEMPERATURE COMFORT ICONS OPERATION MODES HOLD FUNCTION RELATIVE HUMIDITY KEY LOCK SYSTEM “ON” INDICATION TEMPERATURE TREND GRAPH AUTOMATIC VENTILATION COPY PROGRAM CLOCK SET OPTIONS WEEKDAY Set Time and Day USAGE MONITOR SET / PROGRAM TEMPERATURE PROGRAM NUMBER BATTERY LOW INDICATION SET HUMIDITY Press SET CLOCK to start time setting. The time and SET symbol will flash. Use AHEAD or BACK to set the current time.
Programs This thermostat is equipped with 7 DAY PROGRAMMING. Monday + Tuesday + Wednesday + Thursday + Friday + Saturday + Sunday programming with 4 settings per day. This thermostat is pre-programmed for your convenience or you can set your own programs as desired. P1: MORNING : This is typically for the morning when you may prefer a warmer temperature. : This is an energy-savings mode for the time you are away from home. The setting P2: DAY can be adjusted to minimize energy consumption.
Heating Program 1 Press MODE until the HEAT symbol appears and press PROGRAM once. The P1 and SET PROGRAM symbols will appear on the display. 2 To select the day that you want to program first, press WEEKDAY until the desired day appears. (MON, TUE, WED, THU, FRI, SAT, SUN). 3 Use AHEAD or BACK to select the desired start time for P1. - Program times can be set in increments of 10 minutes. - Note: Program times are the same for heating and cooling.
Cooling Program Press MODE until the COOL symbol appears and repeat the programming procedure as you would for the heating program. - Note: The same program times are used for heating and cooling. Therefore, any changes made to the times here will affect the program times for the heating program. - The setpoint temperature range is 8°C to 35°C (48°F to 95°F) for cooling. Note: The PROGRAM key can also be used at any time to review all the set programs.
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. Note: The thermostat has an automatic delay function to protect the heating and cooling systems from undesired on/off sequences. Sometimes there will be a delay of several minutes before the thermostat will activate the system.
Check Programs The current program is displayed on the lower right-hand section of the LCD screen. Press PROGRAM at any time to scroll through and check all other programs. Press HOME to return to the normal display. current program current (room) temperature Room Temperature Current (room) temperature is displayed on the mid-section of the LCD screen. Relative Humidity Relative humidity is displayed on the mid-section of the LCD screen.
Humidifier Control The humidifier control only works if the humidifier is connected to the thermostat. Please refer to the installation guide on page 30 for connection details. To set the humidity level, first ensure that the thermostat is in the HEAT mode. Press SET CLOCK three times to enter the humidity setting mode. The SET HUMIDITY symbol will appear and the humidity level setting will be flashing. Use UP or DOWN to set the humidity level in increments of 5%.
Temperature Trend Graph: How to change the scale? To change the scale, press USAGE. (USAGE TODAY will appear). Press UP or DOWN to change the scale of the graph. The scale will toggle between: 1 Hour (Total 8 Hour) – 1-hour intervals showing past 8 hours, or 3 Hour (Total 24 Hour) – 3-hour intervals showing past 24 hours, appearing beneath the graph. EXAMPLE: How to read the graph? - Current temperature is about 21°C (70°F) - Approximately 2 hours ago, the temperature was about 19°C (66°F).
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 one hour) than the actual set program time. When the thermostat is in ‘recovery’, the OVERRIDE symbol will be flashing. The Pre-comfort Recovery can be disabled if desired.
Fan Control / Automatic Ventilation For automatic control of the fan, press FAN until the AUTO symbol appears. In cooling, the fan starts/stops with the cooling equipment. In heating, the fan is controlled by the heating equipment and usually starts a few minutes after the heating equipment turns on. For the fan to run continuously, press FAN until the ON symbol appears.
Optional Settings Below is the list of optional settings: - 12/24 hour display format - Heat Cycle Rate (select cycle rate to match the heating equipment) - HE/HG setting - Backlighting ON or OFF - Pre-comfort Recovery ON or OFF - LCD Contrast Selection To begin, press OPTION. The SET OPTION symbol will appear and either 12hr or 24hr will appear. - Select your preference of 12hr or 24hr by pressing UP or DOWN. Press OPTION to move on to Heat Cycle Rate. Factory default is Cr-3.
Press OPTION to move on to the HE/HG setting. Factory default is HG setting. - Select the proper HE or HG setting by pressing UP or DOWN. - Depending on your home’s heating system, you may need to change the HE/HG setting for the fan operation. - HE: Use this setting for electric heating systems. With this setting, the thermostat will turn the fan on immediately with the heating system. - HG: Use this setting for gas or oil-fired furnaces.
Changing Batteries When the battery symbol on the LCD screen 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. To replace batteries: Press MODE until the thermostat is turned to the OFF mode and have the new batteries ready on-hand. Remove the thermostat from its mounting plate (back cover) carefully. Remove the old batteries and install new ones quickly.
Specifications: Number of programs: 7 Day with 4 settings per day Temperature display range: 0 – 55°C (34 – 99.5°F) Humidity display range: 20 to 95% Temperature setting range: 5 – 35°C (41 – 95°F) Humidity setting range: 20 to 70% Storage temperature range: -20 – 50°C (-4 – 122°F) Battery: 2 x “AA” size batteries TROUBLESHOOTING GUIDE PROBLEM SOLUTION LCD screen is blank. - Check if the batteries are installed correctly. - Check if the batteries are fresh and of the correct type.
PROBLEM SOLUTION Heat will not come on but the symbol is animated. 1) Check if the furnace switch and/or pilot flame is turned on, as it may have been turned off. 2) Allow several minutes for the heating system to heat up and the fan to activate. Most heaters will heat up the system for a short while before warm air can be ventilated by the fan. Also check that the HE/HG setting is set correctly. (Refer to page 16). 3) If the heat still does not come on, check the wiring installation again.
PROBLEM SOLUTION Thermostat is set on AUTO mode, but the thermostat does not seem to automatically change-over from HEAT to COOL or vice-versa. - The thermostat has a built-in safeguard time delay of 30 minutes to prevent undesirable change-over sequences from HEAT to COOL or COOL to HEAT. For example, if the thermostat was just running the cooling system, it will take at least 30 minutes before it changes to heating.
Installation Guide 21
Installation Guide Introduction This thermostat can replace common residential thermostats and it is designed for use with most gas, oil or electric heating and air conditioning systems that use low voltage control. Please see compatibility chart for more details. Monday + Tuesday + Wednesday + Thursday + Friday + Saturday + Sunday programming with 4 settings per day Display temperature with 0.
Compatibility Generally, equipment with low voltage control is compatible with the Heating/Cooling Programmable Thermostat (52-2570-6). For details on compatibility of your particular equipment, please call our technical assistance line at 1-888-468-6876.
Installation The following tools may be required for installation: ( Power drill with a 3/16” bit ) screwdriver ( If necessary, to drill holes on the wall ) Masking Tape (To wrap the exposed wires temporarily and labeling the disconnected wires) Wire Stripper/Cutter (If necessary, to strip the wires) Level (If necessary, to level the thermostat) 2 “AA” size batteries (included) - “AA” SIZE + - “AA” SIZE + See below to select a suitable place for the new thermostat installation.
Choosing location for new thermostat Thermostat should be mounted: Approximately 5’ (1.5 m) 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. Exposed 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 systems are working properly before installation. If either does not work, contact a heating/air conditioning service person to fix the problem before installation. 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 top. Thread the existing wiring through the big center hole from the back and set the back cover horizontally on the wall. Select two appropriate mounting holes and mark the locations with a pencil. If necessary, use a level to make sure the thermostat is leveled. Remove the back cover from the wall and drill two 3/16” holes in the marked screw positions.
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. Depending on your heating/cooling equipment, you may need to connect 2 to 8 wires to the thermostat. If you have two ‘R’ wires, then connect each wire to its corresponding terminal and remove the JUMPER between the RC and RH terminals.
Wiring Diagram 2-WIRE HEATING 4-WIRE HEATING/COOLING 3-WIRE HEATING 5-WIRE HEATING/COOLING 29
Installing control wires for humidifier control 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 thermostat. 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.
INSTALLING THE BATTERIES AND SELECTING THE DISPLAY IN °C or °F Install the 2 “AA” size batteries (included) into the thermostat following the polarity as marked. The LCD screen will immediately show the room temperature. You should now perform a HARD RESET to set the thermostat to its default settings. To perform a HARD reset and select °C or °F, first press and hold the LOCK key. While holding down the LOCK key, press and release the RESET (R) key located above the battery compartment on the back.
Attaching the thermostat to the back cover Attach the thermostat body to the back cover (that is already mounted on the wall) by carefully aligning the two pieces and pressing firmly until they snap together. Limited 5-year Repair Warranty This product carries a five (5) year repair warranty against defects in workmanship and materials.
