Dimplex HTC621W User manual

Owners Manual
HTC621W
7-Day Programmable Thermostat 3600W
HTC625W
7-Day Programmable Thermostat 4000W
7213110100R02

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Congratulations on your purchase of this Dimplex line-voltage thermostat. Your new ther-
mostat is preprogrammed by the installer and ready to use. Please take the time to read
and understand this manual so you can begin to enjoy the convenience this product offers.
Features
• CSAC828PerformanceCertied
• 7 day programming with 4 settings per day
• High Power up to 4000W (HTC625W only)
• Ideal for baseboard heaters, convectors, radiant ceilings and electric fan-forced
heating systems
• Temperature setting and display in °C or °F
• Precise temperature control set in half degrees
• TRIAC system (quiet operation)
• Cycle rates for proportional heating
• Usage Monitor (tracks total run time)
• Maximum temperature limit set point feature
• Pre-comfort recovery system (begins to warm up before preset time)
• Room Temperature and Set Point Temperature display
• Heating Power Level display
• Clock display in 12 or 24-hour format
• Backlit LCD screen
• Internal Rechargeable backup for clock and settings
• Built-in surge protection
• Setting range: +5°C to +35°C (41°F to 95°F)
• Simple 2-wire installation
Specications - Rating: 120V~240V AC, 60Hz
HTC621W Maximum Load: 15A, 3600W @ 240V, 1800W @ 120V
HTC625W Maximum Load: 16.7A, 4000W @ 240V, 2000W @ 120V
Minimum Load: 300W @ 240V

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This product is for use with high voltage system (120V~240V) with a minimum load
of 300W; it is not designed for use with low voltage (24V) central heating & air condi-
tioning systems or wall mounted furnaces.
Inordertoavoidre,shockordeath,shutoffpowersupplyatthecircuitbreakeror
fuse and test that the power is off before wiring.
This product must be installed in accordance with the Canadian Electrical Code, and
intheprovinceofQuebec,byaqualiedelectrician.Dimplexassumesnorespon-
sibility for damages caused by improper wiring. Improper installation automatically
voids the warranty.
• Verify that the heating appliance that is being connected is within the speci-
edloadrange.
• Conrmvoltageiswithinthedevicerating.
• For wiring, use copper conductors only.
• Mustbemountedonacertiedelectricalbox.
Keep this manual in a safe place for future reference.
Contact us at:  www.dimplex.com/customer_support
For Troubleshooting and Technical Support
OR Toll-Free 1-888-DIMPLEX (1-888-346-7539)
Monday to Friday 8:00 a.m. to 4:30 p.m. EST
Please have your model number and product serial number ready.

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Step-by-step Installation ..........................................5
LCD Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Location of Buttons ..............................................8
Option Settings .................................................9
Option 1: Choosing 12- or 24-hour Format .........................9
Option 2: Selecting the Heat Cycle Rate ...........................9
Option 3: Enabling the Pre-Comfort Recovery Feature ............... 11
Option 4: Selecting the Temperature Unit (°C or °F) .................12
Setting Time and Day ...........................................12
Program Periods ...............................................13
Samples of Temperature Settings ..................................14
Default Setting ..............................................14
Custom Setting .............................................14
Setting Program Schedules.......................................15
Copy Program Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Restoring Default Programs and Options ............................17
Temporary Temperature Override ..................................17
Hold Function .................................................18
Heating Power Level Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Usage Monitor .................................................19
Memory Back-Up...............................................19
High Limit Function .............................................20
Troubleshooting................................................21
Limited 2-Year Warranty .........................................23
Table of Contents

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Installation
Step-by-step Installation
1. Remove the old thermostat carefully and identify the two wires from the wall box.
2. Gently remove the faceplate from the right side of the new thermostat.
Note: Do not remove the screws from the back of the unit as these screws hold the ther-
mostat together.
3. Using the wire nuts provided, securely fasten each wire from the new thermostat to a
wire in the wall box. Refer to the wiring diagram on the next page.
Note: Ensure no bare wire is exposed.
Remove Faceplate
To remove the faceplate, genly
pull the right side of the ther-
mostat. The faceplate should
come off easily.

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*120V~240V AC Lines
4. Mount the new thermostat onto the wall box using the two screws provided through
the mounting holes, and then replace the faceplate. (Place 2 screws in either the 2
right holes or the 2 left holes).
Note: If mounting on a single gang box, use the two mounting holes on the left side.
5. Reconnect power supply.
Installation
Step-by-step Installation . . . continued

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LCD Display

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Location of Buttons

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Option Settings
This thermostat has 5 OPTION settings that you can change. The OPTION data will appear
on the lower pane of the screen.
Option 1: Choosing 12- or 24-hour Format
• PressandholdSETfor3secondstoentertheOptionSettingmode.willash
on screen. (Note: The 12-hour format is the default setting.)
• Press or to toggle between the 12- and 24-hour format.
Option 2: Selecting the Heat Cycle Rate
To provide precise, consistent and economical heating, this thermostat has an adjustable
heat cycle rate. The cycle rate determines the on/off time cycles that the thermostat uses to
reach and maintain the desired temperature.
Certaincycleratesaremoreefcientwhenusedwithcertaintypesofelectricheating
systems. Selecting the correct cycle rates help maintain an even temperature, which has
proven to reduce energy usage to reduce energy usage while improving comfort.
Cr Cycle Rates
Cr-0 OFF(xedspan)
Cr-1 20 seconds
Cr-2 240 seconds (4 minutes)

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Operation
Cr 0 isaxedspan(nocycling),withavarianceof+/-0.3°C(+/-0.6°F).Theheatingunit
will operate at full power and the power bar will appear full. This function is for users who
do not want their electric heating devices turning on and off frequently. This is the recom-
mended setting for fan-assisted electric heating devices.
Cr 1 (Default) is a 20 second cycle rate with proportional heating. This means the heating
will be turned on and off once every 20 seconds to provide a stable room temperature. This
cycle rate allows a proportional level of power to the heating device. This is indicated on
thethermostatdisplaybythepowerbarwhichwillbepartiallylled;indicatingtheamount
of power going to the heater. This setting is recommended for non-fan assisted baseboards
andelectricheatingdevicesandwillprovidethemostenergyefcientheatingandastable
temperature.
Cr 2 is a 240 second span. This means the heating will be turned on and off once every
240 seconds. This is the recommended setting for fan assisted heaters, radiant ceilings
and convectors.
1. While it is still in the Options Setting mode, press SET again to advance to the
secondoption(CR:1willashonscreen).
2. Press or to select the cycle rate
Option 2: Selecting the Heat Cycle Rate . . . continued

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Operation
Option 3: Enabling the Pre-Comfort Recovery Feature
This thermostat is equipped with a Pre-comfort Recovery feature which activates the heat-
ing system in advance of the actual set program time so that the room will be at the desired
temperature at the start of the program time.
It is normal for the system to be activated earlier than the actual set program time (up to an
hour). The Pre-comfort Recovery feature can be disabled, if desired. If this feature is turned
off, heating will only be initiated at the exact start time of the program period.
1. Press SET again to advance to the third option - Pre-comfort Recovery feature
(rE:1willashonscreen)
2. Press or to adjust setting:
•rE:0Pre-comfortRecoveryfeatureisdisabled
•rE:1Pre-comfortRecoveryfeatureisenabled

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Option 4: Selecting the Temperature Unit (°C or °F)
Celsius (°C) is the default temperature unit; no action is required if this is the desired tem-
perature display.
1. PressSETagaintoadvancetothenaloption.Thecurrenttemperaturewillap-
pear on screen.
2. Press or to toggle between the °C or °F
IMPORTANT: If you wish to use Fahrenheit (°F), it is important to choose this temperature
unit before you begin programming the thermostat. If you proceed to set programs using
the default mode in Celsius (°C), then change to Fahrenheit (°F) or vice versa, all programs
set by the user will be deleted and will reset to factory defaults.
Setting Time and Day
1. Press SET to enter the clock setting mode. (SET appears and the clock symbol/
timeashes).
2. Press or to scroll to the correct time of day. (TIP: Hold the button to acceler-
ate).
3. PressDAYrepeatedlytochangethedayoftheweek.(Weekdaysymbolstoash).
4. Press SET to end the time mode; or wait 15 seconds to return to normal display.
Operation

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Program Periods
For maximum energy savings, this thermostat is equipped with 7-day programming – you
can program 4 settings per day for each day of the week. This thermostat is prepro-
grammed for your convenience, or you can set your own programs as desired. The pro-
gram periods (P1, P2, P3 and P4) allow you to set the temperature settings and start times
throughout the day.
P1: Morning During the morning, when you may prefer to wake up to a warmer tem-
perature.
P2: Day The time you leave home is usually an energy-savings period; when the
temperature can be reduced to minimize energy consumption. If you
are staying home on a particular day, you may override this setting by
manually adjusting the temperature using the button.
P3: Evening This the time you return home when you prefer to set the temperature to
a comfortable level. Generally, the temperature is set to warmer settings
during fall/winter and to cooler settings during spring/summer. If you
stay home during the day, periods 1, 2 and 3 can be set at the same
temperature level.
P4: Night This is the time you go to bed, also an energy savings period. You may
set the temperature to your desired energy saving level to save on heat-
ing cost.
Operation

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Operation
Samples of Temperature Settings
Default Setting
The factory default setting will activate automatically; convenient for people who are
away from home during the day and who wish to maximize energy savings.
Period Time Heat Set Point
Morning 6:00 AM 69.0°F (20.5°C)
Day 8:00 AM 63.5°F (17.5°C)
Evening 5:00 PM 70.0°F (21.0°C)
Night 10:00 PM 62.5°F (17.0°C)
Custom Setting
An example of a custom programming; convenient for people who are at home dur-
ing the day and want the home warm all day and cooler at night.
Period Time Heat Set Point
Morning 7:00 AM 69.0°F (20.5°C)
Day 8:00 AM 69.0°F (20.5°C)
Evening 5:00 PM 69.0°F (20.5°C)
Night 11:00 PM 62.5°F (17.0°C)

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Operation
Setting Program Schedules
First, select the day you wish to program; then select the start times and temperature set-
tings for all four programs periods. Scroll through the daily Program Periods in this order:
P1, P2, P3, P4. You may select any weekday to begin.
TemperatureSeng
Weekdays
ProgramPeriods
ClockSymbol
StartTime
1. Press PROG to enter the program setting mode.
2. Press DAY to select the day you wish to program. (P1 will appear ).
3. Press or to set the desired temperature.
4. Press or to set the start time.
5. Press PROG again to set the time and temperature for the next periods (P2, P3
and P4).
6. Press PROG to exit program mode.
7. Repeat the above steps until the time and temperature settings for each day of the
week are programmed.

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Copy Program Function
Using this thermostat’s COPY function is an easy and convenient way to copy the program-
ming for all four period settings (P1, P2, P3 and P4) from one day to another instead of
programming each day individually.
Presstoenter ProgramSeng ModePROG
Presstocopyall four programming
periods
COPY
1. If you are not already in the program mode, press PROG to enter the program setting
mode.
2. Press DAY to select the day you wish to copy from.
3. PressCOPY;theCOPYsymbolwillappearandthenextweekdaywillash.
4. Press DAY to select the day you wish to copy the programs to.
5. Press COPY again to copy settings for all four program periods; the COPY symbol will
disappear to indicate that the COPY function is complete.
6. Repeat the above steps to copy the program to another day.
Tip: If you press COPY 12 times consecutively, the programmed settings will be copied for
the entire week.
Operation

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Restoring Default Programs and Options
Ifyouhavedifcultyprogrammingyourthermostat,youmaywishtorestorethefactory
default settings and begin again.
1. Press and hold SET for 3 seconds to enter the option setting mode.
2. Press and hold PROG for 3 seconds to restore all programs to factory defaults.
Note: This will restore the default programs and option settings but will not affect the clock.
To reset the clock, press RESET (The RESET button must be pressed gently by using
a small blunt object). This will revert the clock back to 9:00 AM Monday morning.
Temporary Temperature Override
This function allows you to temporarily override the temperature setting for the current time
period. The thermostat will automatically return to the programmed settings at the next
program period.
Press or manually to adjust to the desired temperature setting. The temperature can
be set in half-degree increments (0.5 °C or 0.5 °F).
Tip: Press and hold or button to change the setting more rapidly.
Operation

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Hold Function
This function allows you to permanently adjust the temperature setting for all time periods.
It maintains a constant temperature and disables all programmed settings.
1. Press HOLD to enter the hold mode; the HOLD symbol appears.
2. Press or to manually adjust to the desired temperature setting
3. To cancel the HOLD function at anytime, press HOLD again. The HOLD symbol will
disappear
Display current output powerlevel
Indicated “HOLD” funconison
Heating Power Level Display
When the thermostat activates the heating system, the Heat “On” symbol will appear.
Equipped with an intelligent proportional regulation system, this thermostat will determine
the amount of power needed by the electric heater to maintain the room temperature at
precisely the set temperature. The “Power Bar” (A) will indicate the current output power
level. 1 BAR = 20% and 10 BARS = 100%
Operation

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Usage Monitor
The thermostat tracks the total run time, i.e. the total time the heating equipment is running.
1. Press USAGE once to view USAGE TODAY (starts at midnight).
2. Press USAGE again to view USAGE THIS WEEK (total time from Monday to current
day; automatically resets every Monday morning, after midnight on Sunday. A new
week begins Monday morning).
Displaystotal meheang
is runningper day/perweek
Memory Back-Up
Thememoryback-upwillsaveandprotectprogramsandoptionsettingsindenitely.If
an extended power outage occurs, only the clock setting may be affected. The clock will
continue to run and display on the LCD screen for up to 1 to 2 days even without power,
due to the rechargeable back-up battery inside the unit. However, if the power outage is
longer than 2 days, the clock will revert back to the factory default setting and will need to
be reset.
Operation

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High Limit Function
The High Limit Function is a security feature which allows the user to select the maximum
temperature limit. If this feature is activated, the user cannot set the temperature to go over
this limit. The High Limit setting cannot be bypassed by programs, temporary overrides or
the Hold function.
Indicates High Limit Funcon
is acvated
1. To activate the function, press or until the desired high limit temperature is shown
in the program temperature pane.
2. Press USAGE and COPY simultaneously for 3 seconds to activate this function. A
LOCK symbol will appear on screen.
3. All existing programs will be scanned and if an existing temperature setting is above
the new maximum set point, it will be reduced to the high-limit set point.
4. To deactivate, turn the thermostat off for 30 seconds, then turn it back on. The LOCK
symbol will appear on screen.
5. While the LOCK symbol is blinking, the deactivation process can be carried out by
pressing USAGE and COPY simultaneously for 3 seconds. . The LOCK symbol will
disappear upon deactivation.
Operation