Stelpro SDHR Series User manual

INSSDHX0622
WARNING
Before installing or using this product, you must read and understand these instructions and keep them for future reference. The manufacturer cannot be held
responsible for anything, and the warranty will be invalid if the installer and the user do not meet these guidelines.
This product must be installed by a qualied person and connected by a licensed electrician in accordance with the electrical codes and building codes
in your area.
Failure to follow these guidelines could result in personal injury, property damage, serious injury and potentially fatal electric shocks.
Protect the unit using the appropriate breakers or fuses, by referring to the information on the nameplate.
Make sure the supply voltage (volts) corresponds to the voltage indicated on the nameplate.
This unit must be grounded.
Turn off the power of the unit at the circuit breaker/fuse before proceeding with the installation, repair and cleaning.
Make sure the device is designed for the intended application (if necessary, consult the product catalog or a representative).
If the power of the unit is insufcient for the size of the house, it will operate continuously; therefore, the product will age prematurely.
Follow the distances and positions indicated in the installation section of this guide.
If the installer or the user changed the unit in any way whatsoever, they will be liable for any damages resulting from this modication and the UL certication could
be voided.
INSTALLATION
AND USER GUIDE
SDHx SERIES (SDHR, SDHI AND SDHF)
SDHXT SERIES (SDHRT, SDHIT AND SDHFT)
This unit complies
with CSA and UL
standards
Product may differ from illustrations.
For further information or to consult this guide online, please visit our website at www.stelpro.com

2INSSDHX0622
COIL
FIG. 1 FIG. 2
Minimum of 24 in. (61 cm)
between the heating coil
and the access doors or
circulators, except if a
metallic screen is
supplied with the coil.
MECHANICAL INSTALLATION OF THE SDHI(T)
DUCT HEATER – FIG. 1
• The ventilation ducts on both sides of the duct heater must be
sufciently supported, based on the weight of the unit.
• Cut an opening in the duct according to the dimensions of the duct
heater. Allow for a 1/8 in. (32 mm) tolerance for the opening you have
cut out.
• Fix the duct heater using metal screws and seal the joints and
openings.
• For the maintenance or repair of the duct heater and to permit
removal of the duct heater or its elements, keep a distance equal
to or greater than the depth dimension W+ control box + 12 in.
(30 cm) between the control box and obstructions.
MECHANICAL INSTALLATION OF THE SDHF(T)
DUCT HEATER – FIG. 2
• On the two duct openings that face each other, bend the anges
outward so as to x the corresponding anges of the duct heater.
• Fix the anges of the duct heater to those of the duct by using
metal screws.
• Seal the joints.
This product should not come into contact with a water source and must be protected from splashes. Do not use the unit if any part has been submerged. Also, do
not activate or disable the unit when you have your feet in water or wet hands.
Since this unit runs hot, there are risks even when the unit is functioning normally. Use caution, judgement and diligence when using it. To avoid burns, do
not let bare skin touch hot surfaces. Allow the unit to cool slightly before handling (it stays warm for a time after functioning).
Never block the air inlets and outlets of the unit. This obstruction could lead to overheating, which could cause a re.
Do not insert foreign objects into the air inlets and outlets of the unit, as this may cause damage and lead to electrical shock or re.
The unit includes hot working components that can produce electrical arcing (sparks). It is not designed to be used or stored in a wet location, or a location containing
ammable liquids, combustible, corrosive, abrasive or chemical materials or explosives such as, but not limited to, paint, gasoline, chlorine and cleaning products.
Some areas are dustier than others. It is therefore the responsibility of the user to evaluate whether to change the lter according to the amount of dirt
accumulated on it. There is a risk of re if the product is not installed and maintained in accordance with these guidelines.
Activation of the thermal protection indicates that the unit has been subjected to abnormal operating conditions. If it remains activated or is turned on and off repeatedly, it
is recommended to have the unit inspected by a qualied electrician or a certied repair centre to ensure that it is not damaged (refer to the limited warranty beforehand).
If the unit is damaged or defective, cut off its power at the breaker/fuse and have it repaired at a certied repair centre (refer to the limited warranty beforehand).
Identify the wiring before unplugging the unit, so as to make sure you can reconnect the unit later on. Incorrect connections may cause a malfunction and pose a danger.
WARNING
• The duct heater must be handled with care.
• Remove the protective packaging right before installation.
• Verify the condition of the elements, ceramics and components.
• Notify the manufacturer if the duct heater has been damaged.
RECEPTION AND HANDLING OF THE DUCT HEATER
CAUTION: NEVER USE A STANDARD DUCT HEATER FOR AN APPLICATION WITH A RISK OF EXPLOSION.
The air owing through the duct, where is installed the duct heater, must not contain any combustible and/or ammable material. Air temperature
at the entrance of the duct heater should not exceed 27 °C (80 °F).
SDHx(T) units must always be installed with their heating elements placed horizontally (+/-15 DEGREES). The duct heater must be installed in
the duct in accordance with the applicable codes in your area.
MECHANICAL INSTALLATION

3INSSDHX0622
VERTICAL FLOW HORIZONTAL FLOW MINIMUM DISTANCE TO AVOID OVERHEATING
OF THE ELEMENTS
X
DÉBIT VERTICALDÉBIT HORIZONTAL
DEVANT
X
X
24''
610mm
MINIMUM
24''
610mm
MINIMUM
TRANSITION
FILTER
BLOWER ELBOW BLOWER
TRANSITION
FILTER
ELBOW
For all models
with F option only.
All models• SDHR serie
• For SDHI et SDHF series
with S option only.
GOOD PRACTICES FOR MECHANICAL INSTALLATION – FIG. 3
The duct heater must be installed in a location where you can assure the air will ow over all of elements. If this is not the case, localized
overheating could occur and lead to premature failure of one or more elements. See FIG. 3 for a few examples on where the air supply may be
problematic.
TYPES OF INSTALLATION TO AVOID
FIG. 3
IMPORTANT NOTES
• Respect the 24 in. (61 cm) minimum distance to ensure proper operation.
• All of the insertion type duct heaters can be installed in ducts containing UP TO 1/2 IN. (12.7 MM) OF INSULATION providing that the unit’s
size corresponds to the interior size of the insulated duct.
• FOR INSULATION THICKNESS GREATER THAN 1/2 IN. (12.7 MM), A COLD SECTION MUST BE SPECIFIED WHEN ORDERING.
• SPECIFY INSULATION THICKNESS WHEN ORDERING.
• The number of watts per square foot of surface is calculated within the metal frame surrounding the heating elements.

INSTALLATIONTOOCLOSETOANELBOW
INSTALLATIONTOOCLOSETOATRANSITION
INSTALLATIONTOOCLOSETOABLOWER
INSTALLATIONTOOCLOSETOAFILTER
OVERHEATZONE
OVERHEATZONE
OVERHEATZONE
OVERHEATZONE
BLOWER

INSTALLATIONTOOCLOSETOANELBOW
INSTALLATIONTOOCLOSETOATRANSITION
INSTALLATIONTOOCLOSETOABLOWER
INSTALLATIONTOOCLOSETOAFILTER
OVERHEATZONE
OVERHEATZONE
OVERHEATZONE
OVERHEATZONE
BLOWER

INSTALLATIONTOOCLOSETOANELBOW
INSTALLATIONTOOCLOSETOATRANSITION
INSTALLATIONTOOCLOSETOABLOWER
INSTALLATIONTOOCLOSETOAFILTER
OVERHEATZONE
OVERHEATZONE
OVERHEATZONE
OVERHEATZONE
BLOWER
Carefully read the name plate and consult the wiring diagram before you start wiring.
Disconnect all power sources before making any electrical connections.
ELECTRICAL SUPPLY
Use insulated conductors rated for 75°C (167°F). Consult the electrical codes applicable in your area to determine the proper wire gauge.
For a 240/208 volt unit powered by 208 V, we recommend that you change the connection of the control transformer to power the electronic board
with 24 V. To do this, disconnect the “240” wire from the control transformer and connect it to the “208” wire.
WIRE CONTROL
Use low voltage wires (16 to 22 AWG solid wire).
ELECTRICAL INSTALLATION
CONFIGURATION 1 CONFIGURATION 2 CONFIGURATION 3

4INSSDHX0622
SENSOR (OPTIONAL)
SUPPLY DUCT
TEMPERATURE SENSOR
(T OPTION)
This sensor must be installed a minimum
distance of 40 in. (100 cm) downstream of
the coil according to the air ow direction in
the duct, as shown.
This sensor measures the air temperature
at the coil exit.
MIN40"
CONTROL CARD SENSOR # LENGTH
CIR-048 & CIR-017 SEN-004 60'' (5 ft)
CIR-011 SEN-006 60'' (5 ft)
CIR-048 & CIR-017 SEN-013 180'' (15 ft)
CIR-011 SEN-017 180'' (15 ft)
VENTILATION DUCT
ELECTRIC COIL
SENSOR (OPTION T)
SUPPLY DUCT TEMPERATURE
AIR FLOW
A
SENSOR # LENGTH
SEN-005* 60'' (5 ft)
SEN-012* 180'' (15 ft)
ELECTRIC COIL
VENTILATION DUCT
ELECTRONIC AIR VELOCITY
SENSOR (OPTION P)
*COMPATIBLE WITH CIR-047, CIR-048, CIR-017 AND CIR-011
AIR FLOW
AIR FLOW
ELECTRONIC AIR VELOCITY SENSOR
INSTALLATION DIRECTION
(P OPTION)
ELECTRONIC AIR VELOCITY
SENSOR (P OPTION)
This sensor must be positioned upstream of
the coil according to the air ow direction in
the ventilation duct, as shown.
This sensor measures air velocity in the
duct. If it is less than 100 fpm, the coil stops
heating.
Note: For proper operation with a P option
installed on a 240/208 unit powered at 208 V,
the control transformer connection MUST be
changed to power the electronic board with
24 V. To do this, disconnect the wire from the
“240” control transformer and connect it to the
“208” wire.
BUILT-IN TEMPERATURE LIMIT SENSOR (TT OPTION)
This sensor is integrated in the electric coil’s heating element. No installation is required.
The sensor measures the ambient air temperature near the electric coil’s elements and modulates the heating time to keep the temperature
between 30 and 45°C (86 and 113°F). When the temperature exceeds 50°C (122°F), the coil stops heating until the temperature drops below
30°C (86°F).
MINIMUM INSTALLATION DISTANCE
BEFORE THE COIL
Power A
12 kW or less 10 in. (25 cm)
more than 12 kW 40 in. (100 cm)

5INSSDHX0622
ELECTRONIC CONTROL OPERATION
CIR-047 CONNECTORS
1. Conguration switch input 24 V (AC/DC), 24 V REF (AC/DC),
0-10 V*
2. LED AC power indicator (GREEN)**
3. Electronic air velocity sensor (P option) or built-in temperature limit
sensor (TT option) input
4. Thermostat input or controller 0-10 V / 24 Vac (pwm) / 24 Vdc
5. 24 Vac power supply
* Position switches according to the input signal, default setting 24 V.
** Flashes when the air velocity is too low for the elements to work. Electronic air
velocity sensor (P option) or built-in temperature limit sensor (TT option).
1
2
R
3
J4
J3 J1
J6
J5
J2
C
4
IN
CIR-047
SCR
5
REF
24 V
0-10V
24 V REF
*
*
AB
0
1
AB
0
1
0
1
0
1
For units not equipped with the optional electronic control, operation is supported by the control installed by the client. Stelpro’s duct heater may
include low or high voltage input terminals. Each input activates one or more elements.
For more information, please see the wiring diagram supplied with the unit.
NOTE: An insufcient air ow (less than 50 cfm/kW), compared to what is required by the power of the duct heater,
will result in the triggering of the automatic thermal protection if the duct heater is not equipped with an optional
electronic control.
GENERAL OPERATION
ANNEX 1 - CIR-047
CONTROL CONNECTION
TERMINAL
POWER
BLOCK
120-600 Vac
1 ph. or 3 ph.
TERMINAL
CONTROL
BLOCK
THERMOSTAT
OR OTHER
LOW-TENSION
CONTROL
EMBEDDED
ELECTRONIC
CONTROL
SCR ELEMENTS
24 V
TRANSFORMER
DUCT
24 Vac
24 Vdc
0-10 V
R,C
IMPORTANT: The electrical hookup of the heating coil
controls must be done according to the technical diagram
included with the device.
The CIR-047 electronic control has been designed to receive the heat-
ing coil conguration of one power stage. This control allows a low-
tension connection with a 0-10 V, 24 Vac (pwm) or 24 Vdc control.

6INSSDHX0622
ELECTRONIC CONTROL OPERATION
CIR-048 CONNECTORS
1. Electronic air velocity sensor (P option) or built-in
temperature limit sensor (TT option) input
2. 24 Vac power supply
3. SCR output / Relays 1, 2, 3
4. Conguration switch input
24 V (AC/DC) / 24 V REF (AC/DC) /
0-10 V / 2-10 V (4-20 mA)*
5. Thermostat input or controller 0-10 V / 2-10 V (4-20 mA) /
24 Vac (pwm) / 24 Vdc
6. Remote duct thermostat input (D070 accessory)**
7. Supply duct temperature sensor input (T option)
8. LED heating indicator (ORANGE)
9. LED power indicator (GREEN)***
10. Potentiometer for temperature adjustment
* Position switches according to the input signal, default setting 24 V.
** Please refer to the D070 remote duct thermostat installation guide for the electronic control card diagram. When the remote duct thermostat is connected to the board, the
temperature adjustment potentiometer (item 10) is bypassed.
*** Flashes when the air velocity is too low for the elements to work. Electronic air velocity sensor (P option) or built-in temperature limit sensor (TT option).
J5
J2J6 J1
A
A
B
B
01
24 V
01 01
J4
J8
J9
24 V REF
01
0-10 V
01
2-10 V
*
*
6
1 3
5
2
4
7
C
IN
R
REF
-
5
°
1
0
°
2
5
°
4
0
°
5
5
°
7
0
°
8
5
°
1
0
0
°
1
1
5
°
1
3
0
°
1
4
5
°
1
6
0
°
-
2
0
°
-
5
°
1
0
°
2
5
°
4
0
°
5
5
°
7
0
°
°C
°F
810 9
Jumper for self mode
ANNEX 2 - CIR-048
CONTROL CONNECTION
IMPORTANT: The electrical hookup to the heating coil
controls must be done according to the technical diagram
included with this device.
The CIR-048 electronic control has been designed to receive the
heating coil conguration of 1 to 3 power stages. This control allows
a low-tension connection 0-10 V, 2-10 V (4-20 mA), 24 Vac (pwm),
24 Vdc with one heating stage.
SELF MODE
This control card allows a standalone operation when IN and R of ter-
minal block are jumped together and dip switch is congured at 24 V.
When this mode is in function, the elements are activated and modulated
without external control to reach and maintain the set point temperature.
Temperature range: from -4°F to 158°F (-20°C to 70°C)
TERMINAL
POWER
BLOCK
120-600 Vac
1 ph. or 3 ph.
R, C
TERMINAL
CONTROL
BLOCK
THERMOSTAT
OR OTHER
LOW-TENSION
CONTROL
EMBEDDED
ELECTRONIC
CONTROL
SCR ELEMENTS
24 V
TRANSFORMER
DUCT
0-10 V
2-10 V
24 Vac
24 Vdc
CONTROL CONNECTIONS
ANNEX 3 - CIR-017 AND CIR-011
IMPORTANT: The electrical hookup of the duct heater
controls must be done according to the technical dia-
gram included with the device.
This electronic control has been designed to receive the duct
heater conguration of one, two or three power stages. This
control allows a low-tension connection with one, two or three
heating stages or with a 0-10 V control.
Temperature range:
from -4°F to 158°F (-20°C to 70°C)
TERMINAL
POWER
BLOCK
120-600 Vac
1 ph. or 3 ph.
0-10 V
W1, W2, W3
R, C
TERMINAL
CONTROL
BLOCK
THERMOSTAT
OR OTHER
LOW-TENSION
CONTROL
EMBEDDED
ELECTRONIC
CONTROL
RELAYS, SCR
OR CONTROL
SWITCHES
ELEMENTS
24 V
TRANSFORMER
DUCT
FRONT VIEW CIR-048 REAR VIEW CIR-048

7INSSDHX0622
5
J2
6
3
J1
2
J9
1
J5
J3 J4
J8
4
7
J6
CIR-011 ELECTRONIC CONTROL CONNECTORS
1. 24 Vac power supply
2. Relay outputs (8) and one SCR dedicated output
3. Electronic air velocity sensor (P option) input
4. Communication expansion connector
5. Supply duct temperature sensor (T option) input
6. Display connector
7. Thermostat or controller inputs (W1, W2, W3, 0-10 V)
8. Junction point between C and C-AUX. C-AUX can be isolated from the device’s
transformer by cutting the junction with a at screwdriver.
ELECTRONIC CONTROL
FAN RELAY
The electronic control can be congured with an output fan relay (R OPTION). This factory set conguration can be deactivated if needed as following:
• Turn on the device and press ▼ at the same time for a few seconds until FAN OFF appears on the electronic control’s user interface.
To reactivate this conguration, the following step needs to be done :
• Turn on the device and press ▲ at the same time for a few seconds until FAN ON appears on the electronic control’s user interface.
CIR-017 ELECTRONIC CONTROL CONNECTORS
1. Relay outputs (2) and one SCR dedicated output
2. Relay outputs (2)
3. 24 Vac power supply
4. Supply duct temperature sensor (T option) input
5. Electronic air velocity sensor (P option) input
6. Thermostat or controller inputs (W1, W2, W3, 0-10 V)
7. Junction point between C and C-AUX. C-AUX can be isolated from device’s transformer by cutting the junction with a at screwdriver.
FRONT VIEW CIR-017 REAR VIEW CIR-017

8INSSDHX0622
MENU STRUCTURE
MAIN MENU
USER INTERFACE
The electronic control is equipped with
a user interface that displays the duct
temperature, error codes and operating
modes. The main menu displays the
air temperature after the coil identied
according to the direction of air ow.
To navigate between menus, press the
MENU button on the user interface. Use
the up ▲ and down ▼ buttons to change
the value displayed in the selected menu.
The value will ash in editing mode. To
conrm the desired value displayed, press
MENU or wait (30 sec.) and the main menu
will automatically be displayed.
To return to the main menu (duct
temperature), keep pressing and releasing
the MENU button until the main menu
displays the duct air temperature, or
wait (30 sec.) and the main menu will
automatically be displayed.
OPERATING MODES
NOTE 1: Displayed by default. Indicates the temperature after the coil in the direction of air ow.
NOTE 2: To recalibrate, press and hold down the MENU button for eight seconds. When the CAL menu is selected, the SCR/Relay outputs are
identied by r1, r2, r3, etc. The number that follows represents the power of the element in relation to the system (from 0 to 9). Recalibration can
take up to ve minutes depending on the number of stage power.
NOTE 3: In this menu, the inputs and outputs can be tested using the ▼▲ buttons. The inputs are identied as 1. for W1, 2. for W2, 3. for W3
and 10. for 0-10 V. If a signal is on for the corresponding input, the display will read ON. For the 0-10 V input, a 4 V level is required for a valid
condition. If the display reads On, the outputs may be activated one at a time for a maximum of eight seconds. If an output is identied as ON,
the corresponding output is activated.
NOTE 4: The ERR error menu only appears when there are one or more system errors. Use the ▼▲ buttons to verify the active error code(s). To
delete the resolved errors, press and hold down the MENU button for eight seconds while the ERR menu is selected.
NOTE 5: Connected to the air velocity sensor (optional).
MODE DESCRIPTION
MENU
W1 MODE If the W1 signal is on and air is owing (NOTE 5), the elements are activated and modulated to reach and
maintain the temperature setpoint (duct temperature sensor).
W12 MODE
If the W1 signal is on and air is owing (NOTE 5), 60% of the elements are activated.
If the W1 and W2 signals are on and air is owing (NOTE 5), all the elements are activated (100%).
The duct temperature is always limited to the set point temperature (duct temperature sensor).
W123 MODE
If the W1 signal is on and air is owing (NOTE 5), 40% of the elements are activated.
If the W1 and W2 signals are on and air is owing (NOTE 5), 70 % of the elements are activated.
If the W1, W2 and W3 signals are on and air is owing (NOTE 5), all the elements are activated (100%).
The duct temperature is still limited to the set point temperature (duct temperature sensor).
0-10 V MODE If there is a signal between 0-10 Vdc and air is owing (NOTE 5), a percentage of the elements is activated and
modulated. The duct temperature is still limited to the set point temperature (duct temperature sensor).
SELF MODE If air is owing, the elements are activated and modulated without external control to reach and maintain
the set point temperature (power supply temperature sensor after the coil, in the direction of air ow).
OFF MODE
The OFF mode turns the unit off.
Warning: The power circuit is still on even when the device is in OFF mode.

9INSSDHX0622
ERROR CODE CHART: CIR-011 AND CIR-017
CODE DESCRIPTION CODE DESCRIPTION
01 RELAY 1 – COIL – DISCONNECTED / GND SHORT CIRCUIT 21 RELAY 1 – ELEMENT – DISCONNECTED
02 RELAY 2 – COIL – DISCONNECTED / GND SHORT CIRCUIT 22 RELAY 2 – ELEMENT – DISCONNECTED
03 RELAY 3 – COIL – DISCONNECTED / GND SHORT CIRCUIT 23 RELAY 3 – ELEMENT – DISCONNECTED
04 RELAY 4 – COIL – DISCONNECTED / GND SHORT CIRCUIT 24 RELAY 4 – ELEMENT – DISCONNECTED
05 RELAY 5 – COIL – DISCONNECTED / GND SHORT CIRCUIT 25 RELAY 5 – ELEMENT – DISCONNECTED
06 RELAY 6 – COIL – DISCONNECTED / GND SHORT CIRCUIT 26 RELAY 6 – ELEMENT – DISCONNECTED
07 RELAY 7 – COIL – DISCONNECTED / GND SHORT CIRCUIT 27 RELAY 7 – ELEMENT – DISCONNECTED
08 RELAY 8 – COIL – DISCONNECTED / GND SHORT CIRCUIT 28 RELAY 8 – ELEMENT – DISCONNECTED
11 RELAY 1 – COIL – OVERLOAD 29 SSR – ELEMENT – DISCONNECTED
12 RELAY 2 – COIL – OVERLOAD 40 AIR VELOCITY SENSOR (COLD THERMISTOR) - DISCONNECTED
13 RELAY 3 – COIL – OVERLOAD 41 AIR VELOCITY SENSOR (COLD THERMISTOR) - SHORT CIRCUIT
14 RELAY 4 – COIL – OVERLOAD 43 AIR VELOCITY SENSOR (HOT THERMISTOR) - DISCONNECTED
15 RELAY 5 – COIL – OVERLOAD 44 AIR VELOCITY SENSOR (HOT THERMISTOR) - SHORT CIRCUIT
16 RELAY 6 – COIL – OVERLOAD 46 AIR VELOCITY SENSOR - DISCONNECTED
17 RELAY 7 – COIL – OVERLOAD 47 AIR VELOCITY SENSOR - SHORT CIRCUIT
18 RELAY 8 – COIL – OVERLOAD 48 AIR VELOCITY SENSOR - OVERLOAD
49 AIR VELOCITY SENSOR - DEFECTIVE
TROUBLESHOOTING/SDHXXX
PROBLEM DEFECTIVE PART OR PART TO CHECK
The unit does not work
• Faulty main power supply connection
• Open main circuit breaker, fuse or control switch
• No thermostat demand (defective thermostat)
• Defective transformer
• Open fuse in secondary transformer winding
The unit has power but the elements do not work
• Defective relay or contact switch
• Defective electronic controller
• Defective transformer
• Open fuse in secondary transformer winding
• Open thermal protection with automatic or manual reset
The unit runs and/or cycles constantly • Defective relay or contact switch
An element runs and/or cycles constantly • Defective relay or contact switch
The unit overheats and/or the elements cycle
when there is a heating demand • Insufficient ventilation
The breaker trips when the unit is turned on • Faulty power supply connections
• Voltage higher than that indicated on the nameplate
Unable to reach the desired room temperature
• One or more defective elements
• Defective thermostat, wrong thermostat setting, positioning or wiring
• Voltage lower than that indicated on the nameplate
• Heat loss in the building greater than the heating capacity of the unit
• Defective relay or contact switch
• Open thermal protection with automatic or manual reset
The electronic display does not light up
• Faulty power supply connections
• Open main circuit breaker, fuse or control switch
• Defective transformer
• Open fuse in secondary transformer winding
• Defective electronic card
• Defective electronic display
AUTOMATIC DIAGNOSTIC
The electronic controls have the capacity to detect operational malfunctions such as a defective contact switch or relay around the coil (open
circuit), damaged relay contacts or contact switches, damaged elements and defective or poorly connected sensors. If an abnormal condition is
detected, the control generates an error code corresponding to the system fault and displays this code on the screen.
FOR ERROR CODE DEFINITIONS, PLEASE REFER TO THE ERROR CODE CHART ON PAGE 5 OF THIS DOCUMENT.

10 INSSDHX0622
TYPICAL STELPRO CONTROL CONNECTIONS FOR CUSTOMER THERMOSTATS
Please refer to your thermostat’s installation guide to validate the connection.
For any connection issues, contact °STELPRO’s Technical Services at 1-844-441-4822.
FIG. 1
REF (-)
IN (+)
C
R
24 V - W1
24 V - R
0 1
A
24 V
B
24 VAC
CIR-047 AND
CIR-048
CONNECTION TO A BIMETAL THERMOSTAT
INPUT CONFIGURATION
ACCEPTED SIGNAL OF ENTRY
FIG. 2
REF (-)
IN (+)
C
R
C / W-
0 1
W+
A
0-10 VDC
B
0 1
A
24 V REF
B
0 1
A
2-10 VDC*
B
24 VAC, 24 VDC, 0-10 V, 2-10 V*
CIR-047 AND
CIR-048
CONNECTION TO A THERMOSTAT (AC/DC SIGNALS)
INPUT CONFIGURATIONS
ACCEPTED SIGNALS OF ENTRY
*CIR-048 ONLY
FIG. 3
REF (-)
IN (+)
C
R
(-)
(+)
0 1
A
B
2-10 V*
500 Ω
CIR-048
CONNECTION TO A THERMOSTAT (4-20 mA SIGNAL)
INPUT CONFIGURATIONS
ACCEPTED SIGNAL OF ENTRY
2-10 VDC*
*4-20mA signal converted to 2-10VDC signal (voltage differential across 500 Ohm resistor).
Notes:
a) 500 Ohm resistor not included.
b) Loop voltage supplied by others.
FIG. 4 CIR-048
REF (-)
IN (+)
C
R
0 1
A
24 V
B
CONNECTION FOR STANDALONE OPERATION
INPUT CONFIGURATION
FIG. 6
REF (-)
IN (+)
C
R
W-
W+
24V - R
24V - C
0 1
A
0-10 VDC
B
0 1
A
24 V REF
B
0 1
A
B
2-10 VDC*
24 VAC, 24 VDC, 0-10 V, 2-10 V*
CONNECTION TO A THERMOSTAT WITH ELECTRIC
REFERENCE ISOLATED FROM COMMON
CIR-047 AND
CIR-048
ACCEPTED SIGNALS OF ENTRY
*CIR-048 ONLY
INPUT CONFIGURATIONS
FIG. 5
REF (-)
IN (+)
C
R
24 V - W1
0 1
24 V - C
24 V - R
A
24 V
B
0 1
A
B
0 1
A
2-10 VDC*
B
0-10 VDC
24 VAC, 24 VDC, 0-10 V, 2-10 V*
CONNECTION TO A THREE-WIRE, ONE-STAGE THERMOSTAT (W1)
CIR-047 AND
CIR-048
INPUT CONFIGURATIONS
ACCEPTED SIGNALS OF ENTRY
*CIR-048 ONLY