Noma THM501 User Manual
®
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 compatible
Includes mounting hardware and 2 “AA” batteries
1
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. The LCD
screen will blank out momentarily.
3
Once the display reappears, then release the LOCK key.
The default temperature scale is Celsius (°C). The temperature display will
immediately appear and flash for several seconds. During this time, you
may quickly select Fahrenheit (°F) by pressing the UP or DOWN key. Or, if
left alone, the temperature display will stop flashing and Celsius (°C) will
be selected.
** **
2
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
SIZE
AA
SIZE
AA
Flip cover open
to access keys.
LOCK
key
Pull apart firmly to remove
the back cover from the
thermostat. DO NOT try to
pry open with a screwdriver.
X
Battery Compartment insert 2 “AA” size
batteries as marked.
3
Function Key Descriptions
AHEAD
PROGRAM
SET CLOCK
OPTION
HOLD
BACK
FAN
COPY
WEEKDAY
USAGE
MODE
HOME
UP
DOWN
LOCK
4
LCD Display
TEMPERATURE
TREND GRAPH
CLOCK
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.
HOLD FUNCTION
RELATIVE HUMIDITY
KEY LOCK
WEEKDAY
USAGE
MONITOR
SET / PROGRAM
TEMPERATURE
OVERRIDE INDICATION
FILTER CHANGE INDICATION
CURRENT (ROOM) TEMPERATURE
COMFORT ICONS
PROGRAM
NUMBER
OPERATION
MODES
SYSTEM “ON”
INDICATION
AUTOMATIC
VENTILATION
COPY PROGRAM
SET OPTIONS
BATTERY LOW
INDICATION
SET HUMIDITY
Press SET CLOCK again. The day and SET symbol will flash.
Use AHEAD or BACK to set the current day.
Press SET CLOCK to exit. (Or, if the HEAT mode is selected, press SET CLOCK twice to exit.
If you press SET CLOCK only once, the thermostat will enter into the Humidifier Control
function; refer to page 11).
5
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
P2: DAY
P3: EVENING
P4: NIGHT
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
can be adjusted to minimize energy consumption.
:
This is for the time you return home and want the house at a comfortable temperature,
typically warmer settings during winter and cooler settings during summer.
:
This is a sleep mode. You may choose to set temperature for energy savings or
comfort as desired.
SCHEDULE OF PRE-PROGRAMMED TIME AND TEMPERATURE SETTINGS
PERIOD
MORNING
DAY
EVENING
NIGHT
P TIME
P1
6:00am
P2
8:00am
P3
5:00pm
P4
10:00pm
HEAT SETPOINT COOL SETPOINT
oo
69.0 F (20.5 C)
oo
63.5 F (17.5 C)
oo
70.0 F (21.0 C)
oo
62.5 F (17.0 C)
oo
77.0 F (25.0 C)
oo
84.0 F (29.0 C)
oo
77.0 F (25.0 C)
oo
79.0 F (26.0 C)
6
Heating Program
Press MODE until the HEAT symbol appears and press PROGRAM once. The P1 and SET PROGRAM
1
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. The times you choose here will be
used for the cooling program.
4
Use UP or DOWN (on extreme right) to set the desired temperature for P1.
- Temperature can be set in increments of 0.5°.
- The setpoint temperature range is 5°C to 32°C (41°F to 89°F) for heating.
5
After setting the desired time and temperature for P1, press PROGRAM again to display P2.
6
Again, use AHEAD or BACK to set the desired time, and use UP or DOWN to set the desired temperature.
7
Press PROGRAM to display P3. Repeat above steps to set the times and temperatures for P3 and P4.
8
To program another day of the week, press WEEKDAY to select the desired day. Then repeat the above
steps to set the desired times and temperatures for P1 to P4.
NOTE: To terminate the programming sequence at any time, press HOME.
NOTE: After the first day is programmed, you can also copy that day to any other day using the
Copy Program function. (Refer to page 8).
7
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. To terminate
the programming sequence at any time, press HOME.
Tip: Press and hold down the AHEAD/BACK or UP/DOWN key to change the numbers quickly.
Copy Program Function
This thermostat can copy program settings from one day to another using the COPY key.
Make sure the thermostat is engaged in the program setting mode by pressing PROGRAM. The
SET PROGRAM symbol will appear.
Select the day you wish to copy by pressing WEEKDAY. Once selected, press COPY. The COPY
symbol will appear.
By default, the following day will appear flashing, designating the day to be copied to. If you wish
to copy to this day, press COPY again. If not, choose the desired day to be copied to by pressing
WEEKDAY, then press COPY. The program settings (HEAT and COOL) from the first day will now
have been successfully copied to the day selected. Repeat these steps for each day you wish to
copy.
8
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.
HOLD Function
This feature is used to hold the thermostat at a constant temperature and disable all set programs until
released.
Press HOLD once and use UP or DOWN button to set the desired hold temperature. The HOLD symbol
will appear to indicate that the Hold function is active.
To cancel Hold function, press HOLD again. The HOLD symbol will disappear and the thermostat will
return to the programmed temperature.
Key Lock Function
To prevent accidental tampering of the programs and temperature settings, you can lock the keypad
using the Key Lock function. To lock the keypad, press and hold LOCK for 3 seconds. The symbol
will appear.
To unlock the keypad, press and hold LOCK for 3 seconds again. The symbol will disappear.
9
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