Stelpro STE402P User manual

INSSTE402P0807
“STE402P”
Programmable electronic thermostat
User’s guide
www.stelpro.com
For further information or to consult this guide on line,
please visit our Web site.

INSSTE402P0807
1. Description
The electronic thermostat STE402P can be
used to control electric heating units such as
electric baseboards, convectors, or aerocon-
vectors. It keeps the temperature of the room
at the desired set point with a high degree of
accuracy. It has an easy user interface and can
manage up to four programming periods a day.
This product is designed for installations with
electrical current - with a resistive load - rang-
ing from 1.2 A to 16.7 A (150 to 2000 W at 120
VAC, 260 to 3475 at 208 VAC and 300 to 4000
W at 240 VAC).
This thermostat is not compatible with the
following installations:
• electrical current higher than 16.7 A with a
resistive load (4000 W @ 240 VAC, 3475 W @
208 VAC and 2000 W @ 120 VAC);
• electrical current lower than 1.2 A with a
resistive load (300 W @ 240 VAC, 260 W @
208 VAC and 150 W @ 120 VAC);
• inductive load (presence of a contactor or a
relay); and
• central heating system.
Parts supplied:
• one (1) thermostat;
• two (2) mounting screws; and
• two (2) solderless connectors suitable for
copper wires.
WARNING
Before installing and operating this
product, the owner and/or installer
must read, understand and follow these
instructions and keep them handy for
future reference. If these instructions
are not followed, the warranty will be
considered null and void and the manu-
facturer deems no further responsibility
for this product. Moreover, the follow-
ing instructions must be adhered to
in order to avoid personal injuries or
property damages, serious injuries
and potentially fatal electric shocks.
All electric connections must be made
by a qualified electrician, according
to the electrical and building codes
effective in your region. Do NOT con-
nect this product to a supply source
other than 120 VAC, 208 VAC or 240 VAC,
and do not exceed the load limits speci-
fied. Protect the heating system with
the appropriate circuit breaker or fuse.
You must regularly clean dirt accumu-
lations on the thermostat. Do NOT use
fluid to clean thermostat air vents.

INSSTE402P0807
2. Installation
Selection of thermostat location
The thermostat must be mounted on a con-
nection box on a wall facing the heating unit,
at around 1.5 m (5 feet) above the floor level,
on a section of the wall exempt from pipes or
air ducts.
Do not install the thermostat in a location
where temperature measurements could be
altered. For example:
• close to a window, on an external wall, or
close to a door leading outside;
• exposed directly to the light or heat of the
Sun, a lamp, a fireplace or any other heat
source;
• close or in front of an air outlet;
• close to concealed ducts or a chimney; and
• in a location with poor air flow (e.g. behind
a door), or with frequent air draft conditions
(e.g. head of stairs).
Thermostat mounting and connection
1. Cut off power supply on lead wires
at the electrical panel in order to
avoid any risk of electric shock.
2. Ensure that the air vents of the thermostat
are clean and clear of any obstruction.
3. Make the required connections using the fol-
lowing figures by selecting the proper type
of installation (2 wires or 4 wires), and us-
ing solderless connectors. For connections
with aluminium wires, you must use CO/ALR
connectors. Please note that this thermostat
does not have polarity, which means that any
wire can be connected to the other.
Two-wire installation
Four-wire installation

INSSTE402P0807
6 . Reinstall the front part of the thermostat on
the mounting base and tighten the screw at
the bottom of the unit.
7. Turn on the power.
8. Set the thermostat to the desired setting (see
the following section). Important: you must
activate the Fan mode when the heating unit
is equipped with a fan; failure of the heating
unit could occur if not doing so.
4. Using a screwdriver, loosen the screw re-
taining the mounting base and front part of
the thermostat. Remove the front part of the
thermostat from the mounting base by tilting
it upward.
5. Align and secure the mounting base to the
connection box using the two screws sup-
plied.

INSSTE402P0807
3. Operation

INSSTE402P0807
Ambient temperature
The figures displayed above the word “AM-
BIENT” indicate the ambient temperature, ±
0.5 degree. Temperature can be displayed in
degrees Celsius or Fahrenheit (see “Display
in degrees Celsius/Fahrenheit”).
Temperature set point
The figures displayed above the word “SET”
indicate the temperature set point. It can be
displayed in degrees Celsius or Fahrenheit
(see “Display in degrees Celsius/Fahren-
heit”).
Out of any adjustment mode, press down the
+ button to increase the set point, or the -
button to decrease it. Set points can only
be adjusted by increments of 0.5 degree. To
quickly scroll through the set point values,
press and hold down the button. The mini-
mum set point is 3°C (37°F), and the maxi-
mum set point is 30°C (86°F).
Adjustment of the hour and the day of the
week
Adjustment procedure of the hour and the
day of the week:
1. press down the Day/Hr button, whether it
is from Man, Auto or Pre Prog mode;
2.
at this moment, the SET icon and the day of
the week start to blink and you can adjust
the day of the week using the + or - but-
ton and confirm your choice by pressing
down the Mode or the Day/Hr button. You
can also press down the day of the week but-
ton desired without using the + or - button and
confirm your choice using the Mode or Day/Hr
button;
3. the two figures indicating the hour blink. You
must adjust them using the + or - button and
confirm your choice by pressing down the
Mode or Day/Hr button;
4. the two figures indicating the minutes blink.
You must adjust them using the + or - button
and confirm your choice by pressing down
the Mode or Day/Hr button. The adjustment
is then completed and the thermostat returns
to the previous mode.
At any time, you can exit the adjustment
mode of the day and the hour using one of
these 2 methods.
1- Press down the Exit button.
2- Press and hold down the Mode button.
3- Do not press down any button during 1 min-
ute.
The adjustment of the hour and the day of the
week can be done from any of the three modes.
In case of a power failure, the thermostat is
self-sufficient for 2 hours. If the failure lasts
less than 2 hours, the thermostat saves the ad-
justment of the hour and the day of the week.
When the power is restored after an extensive
failure, the hour and the day of the week are
recovered, but you must update them.

INSSTE402P0807
Display in degrees Celsius/Fahrenheit
The thermostat can display the ambient tem-
perature and the set point in degrees Celsius
(standard factory setting) or Fahrenheit.
Adjustment procedure for degree Celsius/
Fahrenheit display
1. To switch from the degrees Celsius to the
degrees Fahrenheit, and conversely, simulta-
neously press down the + and - buttons for
more than 3 seconds until the SET icon starts
to blink.
2. Press down the + button to switch from the
degrees Celsius to the degrees Fahrenheit,
and conversely. The degree Celsius or Fahr-
enheit symbol will be displayed.
3. When the adjustment is completed, press
down the Exit button, hold down the Mode
button or do not press down any button dur-
ing 1 minute to exit the adjustment function.
N.B. This adjustment can be done from any of
the three principal modes. From the ad-
justment mode, the figures displayed at
the top of the screen are only useful for
the manufacturer. It is not the ambient
temperature.
Manual mode (Man)
From the Manual mode, you can manually adjust
the thermostat set point by pressing down the
+ or - button to increase the value, or to de-
crease it. To quickly scroll through the set point
values, press and hold down the button. The
set points can range between 3 and 30°C and
can only be adjusted by increments of 0.5°C
(from 37 to 86°F; by increments of 1°F from the
Fahrenheit mode). The thermostat will turn off if
the set point is lowered below 3°C, and the set
point value displayed will be OFF. The standard
factory set point adjustment is 21°C. From this
mode, the screen displays the temperature, the
set point, the heating power used, the hour and
the day of the week.
This mode is initially activated when the power
is turned on for the first time. You must adjust
the hour (as describe in the section “Adjust-
ment of the hour and the day of the week”)
before switching to other modes by pressing
down the Mode or Pre Prog button.

INSSTE402P0807
Automatic mode (Auto)
To switch from the Manual mode to the Auto-
matic mode, and conversely, press down the
Mode button. The Man or Auto icon will be
displayed at the bottom of the screen as ap-
plicable.
From the Automatic mode, the thermostat
adjusts the set points according to the pro-
grammed periods. If no data were entered,
the thermostat acts the same way as from the
Manual mode and the standard factory set
point adjustment is 21°C. It is always possible
to manually adjust the set point using the + or
- button. The selected set point will be effective
until one period is programmed, which repre-
sents an hour and a day of the week. Note that
if the set point is lowered to OFF, the program-
ming will not be effective. It is possible to pro-
gram 4 periods a day, which means that the set
point can change automatically up to 4 times a
day. The period order is not important.
From this mode, the screen displays the tem-
perature, the set point, the heating power used,
the hour, the day of the week and the current
programmed period number (1 to 4; displayed
on the right-hand side of the hour).
Programming procedure of the Automatic
mode
1. To access the Programming mode, press
down the day of the week button that you
want to program (Mon to Sun). Once you
release the button, the selected day of the
week is displayed, the SET icon blinks and
the period number 1 blinks too.
2. Select the period number (1 to 4) that you
want to program using the + or - button. For
each period, the hour and the set point are
displayed. The hour displays --:-- and the set
point displays -- if there is no programming
for the period. You must confirm the period
by pressing down the Mode button.
3. The two figures representing the hour blink to
indicate that you can adjust them (from 00 to
23) using the + or – button. You must confirm
the adjustment by pressing down the Mode
button.
4. After confirmation, the figures representing
the minutes (the last 2 figures) blink and you
can adjust and confirm them in the same
manner as described above (point 3). It
should be noted that the minutes can only
be adjust by increments of 15 minutes.
5. The period set point blinks and you can ad-
just it using the + or - button.
6. After set point confirmation, the program-
ming is completed. The period number in-
creased by 1 and blinks. For example, if the
previously programmed period was 1, pe-
riod 2 blinks. It is then possible to continue
the programming of this period by pressing
down the Mode button. You can also select
another period using the + or – button.
7. At the end of the period 4 programming, you
automatically exit the Programming mode.

INSSTE402P0807
At any time, you can exit the Programming
mode using one of the 3 following methods.
1- Press down the button of the day that you
are adjusting.
2- Press down the button of another day to pro-
gram it.
3- Press down the Exit button.
Moreover, if you do not press down any but-
ton for more than 1 minute, the thermostat will
exit the Programming mode. In all cases, the
programming is saved.
Anticipated start
This mode enables the room to reach the se-
lected temperature at the programmed hour.
In fact, the thermostat estimates the delay
required to reach the set point of the next pe-
riod at the programmed hour. This delay is ob-
tained by the observation of the temperature
variations in the room and the results obtained
during the preceding anticipated starts. That
way, the results should be increasingly precise
day after day. From this mode, the thermostat
displays at any time the set point (SET) of the
current period. The “anticipated start” icon will
blink when the anticipated start of the next pe-
riod will begin.
For example, if the requested temperature be-
tween 8h00am and 10h00pm is 22°C and be-
tween 10h00pm and 8h00am is 18°C, the set
point (SET) will indicate 18°C until 7h59am and
will switch to 22°C at 8h00am. Thus, you will
not see the progression carried out by the an-
ticipated start, but only the desired result.
To activate or deactivate the anticipated start,
the thermostat must be in the Auto or Pre Prog
mode. Then, you must press down the MODE
button for at least 5 seconds. The anticipated
start icon ( ) will appear or disappear to in-
dicate the activation or the deactivation of the
mode. This modification will apply to the Auto
as well as the Pre Prog mode. If you modify
the temperature set point manually when these
modes are activated, the anticipated start of
the next period will be cancelled.
N.B. Please note that the anticipated start is
initially activated when you enter the Au-
tomatic or Preprogrammed mode. Thus,
you must deactivate it following the above
procedure if needed.
Copy of the programming
You can apply the programming of one day
of the week to other days by copying the pro-
gramming one by one or in block.
To copy the programming one by one, you must:
1. press down the source day button (day to be
copied);
2. hold down this button and press down the
destination days one by one. The screen dis-
plays the selected days as you select them.
If an error occurs when you are choosing a
day, press down the erroneous day again to
cancel the selection;
3.
after all selections are completed, release the
source day button. Then, the selected days have
the same programming as the source day.

INSSTE402P0807
To copy the programming in block, you must:
1. press down the source day button and then
the button of the last day of the block to be
copied;
2. hold down these two buttons during 3 sec-
onds. After this time, the destination days are
displayed indicating that the copy in block is
activated;
3. release the buttons. The days of the block
are not displayed anymore and the current
day is displayed.
N.B. The block order is always increasing. For
example, if the source day is Thursday
and the destination day is Monday, the
copy will only include Friday, Saturday,
Sunday and Monday.
Erasing of the programming
You must proceed as follows to erase a pro-
gramming period.
1. Access the Programming mode as described
previously by pressing down the day of the
week button to modify. The period number
will blink and you must adjust it using the +
or - button in order to select the period to be
erased.
2. It is not necessary to press down the Mode
button to confirm the period selection, but
you can do it.
3. Simultaneously press down the + and – but-
tons during 2 seconds to erase the period
programming. The hour displays --:-- and the
set point displays -- to indicate that the pro-
gramming is erased.
4. The erased period number blinks and you
can select another period to be erased or exit
the Programming mode following one of the
3 methods described in the previous page.
Preprogrammed mode
The Preprogrammed mode allows an auto-
matic programming of the thermostat. Up to
252 preprogrammings (A0 to Z1 and 0 to 9;
see appendix 1 attached) are defined in factory
and easily accessible. This mode gives you the
possibility to quickly program the thermostat
using commonly used preprogrammings with-
out having to do it manually.
As from the Automatic mode, it is possible at
any time to manually adjust the set point. This
set point will be effective until the next set point
change anticipated by the preprogramming.
Note that if the set point is lowered to OFF, the
programming will not be effective.
From this mode, the screen displays the tem-
perature, the heating power used, the set point,
the hour, the day of the week and the letter and
the current number of the pre-programming (A0
to Z1 and 0 to 9; displayed on the right-hand
side of the hour; see appendix 1 attached).

INSSTE402P0807
Choice of the preprogramming
You can only access the Preprogramming
mode when the thermostat is out of any pro-
gramming function or adjustment.
You must proceed as follows to access the Pre-
programming mode:
1. press down the Pre Prog button;
2. the Pre Prog icon is then displayed and the
saved selected preprogramming is displayed
as well. This preprogramming can range be-
tween 0 and Z1;
3. from the Pre Prog mode, you can choose the
first 10 preprogrammings by pressing down
the Pre Prog button and release it succes-
sively. Each time you press down the button,
the preprogramming switch from 0 to 9. Once
you have reach 9, you come back to 0;
4. to choose the advanced preprogrammings,
(see appendix 1), press down the Pre Prog
button during 5 seconds. Then, the letter in-
dicator blinks and you can adjust it by press-
ing down the + or - button successively or
by holding them down. Once the letter is
chosen, you must validate your choice by
pressing down the Mode button. Then, the
letter ceases to blink and the figure starts to
blink. The choice of the figure is made in the
same way as that of the letter; using the +
or - button. Once the figure is selected, you
must validate your choice by pressing down
the Mode button.
N.B. From this mode, if you do not press down
any button during more than 1 minute, the
thermostat exits the adjustment function
and saves the choice in progress. Then, the
icons cease to blink and the selected value
remains displayed.
Anticipated start
This mode enables the room to reach the se-
lected temperature at the programmed hour.
In fact, the thermostat estimates the delay
required to reach the set point of the next pe-
riod at the programmed hour. This delay is ob-
tained by the observation of the temperature
variations in the room and the results obtained
during the preceding anticipated starts. That
way, the results should be increasingly precise
day after day. From this mode, the thermostat
displays at any time the set point (SET) of the
current period. The “anticipated start” icon will
blink when the anticipated start of the next pe-
riod will begin.
For example, if the requested temperature be-
tween 8h00am and 10h00pm is 22°C and be-
tween 10h00pm and 8h00am is 18°C, the set
point (SET) will indicate 18°C until 7h59am and
will switch to 22°C at 8h00am. Thus, you will
not see the progression carried out by the an-
ticipated start, but only the desired result.
To activate or deactivate the anticipated start,
the thermostat must be in the Auto or Pre Prog
mode. Then, you must press down the MODE
button for at least 5 seconds. The anticipated
start icon ( ) will appear or disappear to in-

INSSTE402P0807
dicate the activation or the deactivation of the
mode. This modification will apply to the Auto
as well as the Pre Prog mode. If you modify
the temperature set point manually when these
modes are activated, the anticipated start of
the next period will be cancelled.
N.B. Please note that the anticipated start is
initially activated when you enter the Au-
tomatic or Preprogrammed mode. Thus,
you must deactivate it following the above
procedure if needed.
View of the preprogramming
The view of the selected preprogramming is
made in a way similar to the Auto mode pro-
gramming. However, it is impossible to modify
the preprogramming.
You must proceed as follows:
1. press down the day of the week button that
you want to view (buttons Mon to Sun). When
the selected day of the week is displayed,
the SET icon blinks and the period number 1
blinks too;
2. choose the period number (1 to 2) to view
using the + or - button. For each period, the
hour and the set point are displayed. You can
also press down the Mode button to increase
the period number. If you press down the
Mode button when period 2 is displayed, you
exit the View mode.
At any time, you can exit the View mode us-
ing one of these 3 methods.
1- Press down the button of the day that you
are viewing.
2- Press down another day to view it.
3- Press down the Exit button.
If you do not press down any button during 1 min-
ute, the thermostat exits the view mode. At any
time, it is possible to change the day to be viewed
by pressing down the desired day button.
Fan mode
When the thermostat is used to control a heat-
ing system equipped with a fan, the Fan mode
MUST be activated. This mode prevents the
system to continuously start and stop, which
could cause fan failure. The Fan mode is by
default deactivated at the factory. The status
of this mode is indicated on the display by the
Fan icon.
You can activate the Fan mode in a similar way
to the adjustment of the degrees Celsius/Fahr-
enheit.
Adjustment procedure for the Fan mode
1. Simultaneously press down the + and - but-
tons for more than 3 seconds, until the SET
icon starts to blink.
2. Press down the - button to activate or de-
activate the Fan mode. The Fan icon will be
displayed or not, as applicable.
3. When the adjustment is completed, press
down the Exit button, hold down the Mode
button or do not press down any button dur-

INSSTE402P0807
ing 1 minute to exit the adjustment function.
N.B. This adjustment can be done from any of
the three principal modes. From the ad-
justment mode, the figures displayed at
the top of the screen are only useful for
the manufacturer. It is not the ambient
temperature.
Frost-free warning
The Snowflake icon is displayed when the tem-
perature set point is between 3°C (37°F) and
5°C (41°F). A minimum temperature will be
maintained to ensure frost control.
Lock option
It is possible to impose a maximum tempera-
ture set point by activating this mode. Then, it
becomes impossible to exceed this set point,
regardless of the mode. However, it is still pos-
sible to lower the set point at your discretion.
The programming of the Auto and Pre Prog
modes also adhere to this maximum tempera-
ture set point.
Locking procedure
1. Exit any adjustment mode and manually ad-
just the set point at the desired maximum
value.
2. Simultaneously press down the + and - but-
tons during 10 seconds (note that after 3
seconds, the SET icon starts to blink and the
version numbers and the software date are
displayed. Hold down these buttons, if not,
you will enter in the degrees/fan adjustment
mode). After 10 seconds, the Lock icon is
displayed indicating that the lock option is
activated. Then, release the buttons.
Unlocking procedure
1. To deactivate the lock option, cut off the
power supply of the thermostat at circuit
breaker and wait at least 30 seconds.
2. Restore the power supply of the thermostat.
The Lock icon will blink during at least 5 min-
utes, indicating that you can deactivate the
Lock option.
3. Simultaneously press down the + and - but-
tons during more than 10 seconds. The Lock
icon will then disappear indicating that the
lock option is deactivated.
Temperature control
The thermostat controls the temperature of a
room with a high degree of accuracy.
The level of power used to maintain the tem-
perature at the set point is expressed as a
percentage indicated by the number of bars in
the thermometer displayed. The heating power
used is displayed as follows:
0 bar = no heating
1 bar = 1% to 25%
2 bars = 25% to 50%
3 bars = 50% to 75%
4 bars = 75% to 100%

INSSTE402P0807
Power failure
The thermostat can detect a power failure. In
such a case, the adjustments are automatically
saved and recovered when power is restored.
Then, the thermostat enters in a very low con-
sumption mode and only displays the hour and
the day of the week. All the other functions are
deactivated.
If the power failure lasts less than 2 hours, the
thermostat thus saves the adjustment of the
hour and the day of the week. When power is
restored after an extensive failure (more than
2 hours), it recovers the last mode (Man/Auto/
PreProg) as well as the various adjustments
that was effective when the failure occurred.
The hour and the day of the week are also re-
covered. The set point will be the same as what
was active when the failure occurred.
N.B. During the first half hour of the failure,
the hour and the day of the week are dis-
played. After half an hour, the screen turns
off in order to ensure an energy saving.

INSSTE402P0807
4. Troubleshooting
Problem Solution
The thermostat is hot.
In normal operating conditions, the thermostat housing can
reach nearly 40°C at maximum load.
That is normal and will not affect the effective operation of
the thermostat.
Heating is always on. Check if the thermostat is properly connected. Refer to the
installation section.
Heating does not run even if the
thermostat indicates it is on.
Check if the thermostat is properly connected. Refer to the
installation section.
The display does not come on.
Check if the thermostat is properly connected. Refer to the
installation section. Check the power supply at the electrical
panel. Ensure that the heating unit has a switch. If so, ensure
that this switch is turned on.
The display turns off a few
minutes and then turns on again.
The thermal protection of the heating unit has deactivated
the unit due to overheating. Ensure that the heating unit is in
good condition of operation and that clearance around the
appliance is according to the manufacturer’s specifications.
The display has low contrast
when heating is on.
The load is lower than the minimum load. Install a heating
unit that is within the load limits of the thermostat.
The displayed ambient
temperature is incorrect.
Check the presence of an air stream or a heat source near
the thermostat, and correct the situation.
The display indicates E1 or E2. Faulty thermal sensor. Contact the customer service.
Weak luminosity of the display. Possibility of a bad contact. Check thermostat wirings. Refer
to the installation section.

INSSTE402P0807
5. Technical specifications
Supply voltage:
120/208/240 VAC, 50/60 Hz
Minimum electrical current with a resistive
load:
1.2 A
300 W @ 240 VAC
260 W @ 208 VAC
150 W @ 120 VAC
Maximum electrical current with a resistive
load:
16.7 A
4000 W @ 240 VAC
3475 W @ 208 VAC
2000 W @ 120 VAC
Range of temperature:
0°C to 40°C (32°F to 99°F)
Temperature display resolution:
0.5°C (0.5°F)
Range of the temperature set points:
3°C to 30°C (37°F to 86°F)
Temperature set point increments:
0.5°C (1°F)
Storage:
-20°C to 50°C (-4°F to 120°F)
Certification:
cCSAus
Limited warranty
This unit has a 3 years warranty. If at
any time during this period the unit be-
comes defective, it must be returned to
its place of purchase with a copy of the
invoice, or simply contact our customer
service department (with a copy of the
invoice in hand). In order for the warran-
ty to be valid, the unit must have been
installed and used according to instruc-
tions. If the installer or the user modifies
the unit, he will be held responsible for
any damage resulting from this modi-
fication. The warranty is limited to the
factory repair or the replacement of the
unit, and does not cover the cost of dis-
connection, transport, and installation.
Customer service
Stelpro Design Inc.
1041, Parent Street
St-Bruno (Quebec)
J3V 6L7 Canada
Email: [email protected]
Web site: www.stelpro.com