Stelpro PYROBOX3 User manual

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PYROBOX3
PYROBOX3C
PYROBOX5
PYROBOX
INS-PYROBOX-051219
WWW.STELPRO.COM
CONT[email protected]
1-844-STELPRO
OWNER'S
MANUAL
THANK YOU FOR YOUR PURCHASE!
NEED ASSISTANCE? CONTACT STELPRO CUSTOMER SERVICE.
CONTROL PANEL
FOR SNOW MELTING SYSTEM
IMPORTANT INSTRUCTIONS
SAVE THESE INSTRUCTIONS
INSTALLATION NOTES
1. Familiarize yourself with the markings, warnings, components
and terminology.
2. The PYROBOX power boxes and its accessories must be
installed by a qualied electrician in accordance with local
regulations and the requirements of the NEC (NFPA 72) and
CEC part 1.
3. WARNING: Ensure the power is disconnected from all circuits
before mounting the power box and making any connections.
Contact with components carrying hazardous voltage can
cause electric shock and may result in severe personal injury
or death.
4. Installer must ensure the installation of approved discon-
nect means for all power supply circuits feeding this unit.
5. The power boxes are suitable for indoor wall-mounted instal-
lation only.
6. Ensure wiring according to the provided schematics using
copper conductors only.
7. Make sure the wire gauge (AWG) is suitable for the circuit
amperage draw, as specied in the NEC/CEC table 1.
8. Ensure that the main breakers (fuses) are suitable for the heat-
ing systems rating (80% load). Grounding means must comply
with local regulations and NEC/CEC.
9. Ensure that the heating system/de-icing system connected to
this unit complies with the UL 499 or UL 515 and CSA 22.2 #
130.3 standards and is certied / listed by an NRTL.
10. Ensure that all wiring is rated for the application at 60°C
(140°F) as per UL 515 CSA 22.2 #130 clause 12 table 12.1.
11. Ensure that any holes punched for the conduit does not com-
promise the integrity of the enclosure ratings.
GROUND FAULT CIRCUIT INTERRUPTER (GFCI)
12. The ground fault interrupter/residual current detector installed
in this system is a non-class-A GFCI, intended for equipment
protection.
13. Familiarize yourself with its operation and required settings.
14. At the installation and commissioning stages, use a calibrated
milliamp meter to read and record the heating system’s natu-
ral leakage.
15. Set the GFI/RCD to no more than 30 milliamps higher than
that of the reading. This step might have to be repeated a few
times, to avoid nuisance tripping.
16. The GFCI should be tested monthly. Please refer to the cali-
bration and testing instructions in appendix 1 of this manual.
PLEASE READ THIS MANUAL AND THE SAFETY WARNINGS CAREFULLY BEFORE INSTALLING
AND USING THE CONTROLLER AND SAVE IT FOR FUTURE USE.

2
ON
#3#4 #2 #1
ABOUT
PYROBOX GENERAL SYSTEM LAYOUT
Auxiliary control
(e.g. gutter or
pavement heaters)
(Optional)
PYROCON12
Optional third-party sensor
(e.g. Gutter or pavement sensor)
Snow and ice sensor/sensors
PYROSENSE
Upper limit sensor
PYROULSS
Zone 1 Zone 2 Zone 3 Zone 4 Zone 5
PYROBOX3/3C/5
The PYROBOX3/3C/5 power boxes together with the PYROCON12
controller and interface panel, offer smart and easy control over the
PYRO snow and ice melting system.
It can operate up to 4 snow melting zones and one auxiliary zone,
with selectable sequencing method. Typical applications include
driveways, sidewalks, loading docks, stairs, pavements and gutters.
The backlit LCD screen provides full interface and information of the
system status.
The use of several zones staggering allow covering larger area for
snow melting with a limited available electrical power.
The PYROCON12 offers various operating and programming options,
including:
• Switchable temperature scales (°F or °C)
• Both automatic and manual modes
• Adjustable heater cycle and splitting times
• Adjustable heater on, off and delay hold
• Optional third-party auxiliary control snow sensor
(e.g. gutter sensor)
• Adjustable lower ambient temperature limit to stop heaters
(lockout)
• Energy-saving upper temperature limit
• Adjustable snow sensor sensitivity (%RH)
• Commissioning/test mode

3
WIRING
PYROBOX5
21 AC C RC BRL1 N1 R
F-5A
R
IN
IN
1
2
A1
A
C1
B1
B
C
A1
A
C1
B1
B
C
A1
A
C1
B1
B
C
A1
A
C1
B1
B
C
12
Max. 60A, 600V Max. 30A, 277V
Branch circuit protection and disconnect
provided by installer
GFCI
GFCI
Transformer
130VA
120/24V
C.T. (Current transformer)
Internal connections
Black Black
Red Red
White
Blue
White
Internal connections
Shield wire
See
Appendix 1
L1, L2, L3 – 600V max.
50A max. per pole
Heater load connection
30A, 277V max. Main supply 120V Third-party
ice/snow
sensor
(optional)
PYROULS
Upper limit
temp. sensor
(by STELPRO)
PYROSENSE
Snow sensor
(by STELPRO)
HEATER LOAD CONNECTION
• Provide 3-phase contactors C1, C2, C3 and C4 with up to
600 VAC, 50 AMP maximum per pole.
• Provide contactor C5 with up to 277 VAC, 30 AMP.
• Make sure the wire gauge (AWG) is suitable for the circuit
amperage draw, as specied in the NEC/ CEC table 1.
MAIN SUPPLY FOR THE POWER BOX
• Provide terminals L1, N1 with 120 VAC supply.
CONNECTION TO THIRD-PARTY ICE/SNOW
SENSOR (GIT-1 / CIT-1 / SIT/6E) – OPTIONAL
• 3-wire shielded cable
• Up to 2,000 ft (609 m) using 12 AWG 3-wire shielded cable.
• Up to 500 ft (152 m) using 18 AWG 3-wire shielded cable.
CONNECTION TO SNOW SENSOR
(PYROSENSE)
Please refer to the PYROSENSE installation section of this
manual.
IMPORTANT! If the heaters are connected in a star configuration, the neutral must pass through the internal current
transformer ring and the external branch circuit protection.
CAUTION: Incorrect voltage may cause fire or seriously damage the unit.

4
HEATER LOAD CONNECTION
• Provide 3-phase contactors C1 and C2 with up to 600 VAC,
50 AMP maximum per pole.
• Provide contactor C5 with up to 277 VAC, 30 AMP.
• Make sure the wire Gauge (AWG) is suitable for the circuit
amperage draw, as specied in the NEC/ CEC table 1.
MAIN SUPPLY FOR THE POWER BOX
• Provide terminals L1, N1 with 120 V supply.
CONNECTION TO THIRD-PARTY ICE/SNOW
SENSOR (GIT-1 / CIT-1 / SIT/6E) - OPTIONAL
• 3-wire shielded cable
• Up to 2,000 ft (609 m) using 12 AWG 3-wire shielded cable.
• Up to 500 ft (152 m) using 18 AWG 3-wire shielded cable.
CONNECTION TO SNOW SENSOR
(PYROSENSE)
Please refer to the PYROSENSE installation section of this
manual.
21 AC C RC BRL1 N1 R
F-5A
R
IN
IN
1
2
A1
A
C1
B1
B
C
A1
A
C1
B1
B
C
IMPORTANT! If the heaters are connected in a star configuration, the neutral must pass through the internal current
transformer ring and the external branch circuit protection.
CAUTION: Incorrect voltage may cause fire or seriously damage the unit.
60A, 600V max. 30A, 277V max.
GFCI
GFCI
Transformer
130VA
120/24V
C.T. (Current transformer)
Black Black
Red Red
White
Blue
White
Internal connections
See
Appendix 1
Heater load connection
L1, L2, L3 – 600V max.
50A max. per pole
Heater load
connection
277V, 30A
max.
Main
supply
120 V
Third-party
ice/snow
sensor
(optional)
PYROULS
Upper limit
temp. sensor
(by STELPRO)
PYROSENSE
Snow sensor
(by STELPRO)
Internal connections
Branch circuit protection
and disconnect provided
by installer
Shield wire
PYROBOX3C

5
IMPORTANT! If the heaters are connected in a star configuration, the neutral must pass through the internal current
transformer ring and the external branch circuit protection.
HEATER LOAD CONNECTION
• Provide contactors C1, C2, C3 and C4 with up to 277 VAC,
30 AMP.
• Make sure the wire gauge (AWG) is suitable for the circuit
amperage draw, as specied in the NEC/CEC table 1.
MAIN SUPPLY FOR THE POWER BOX
• Provide terminals L1, N1 with 120 VAC supply.
CONNECTION TO THIRD-PARTY ICE/SNOW
SENSOR (GIT-1 / CIT-1 / SIT/6E) - OPTIONAL
• 3-wire shielded cable
• Up to 2,000 ft (609 m) using 12 AWG 3-wire shielded cable.
• Up to 500 ft (152 m) using 18 AWG 3-wire shielded cable.
CONNECTION TO SNOW SENSOR
(PYROSENSE)
Please refer to the PYROSENSE installation section of this
manual.
21 AC C RC BRL1 N1 R
F-2A
R
IN
IN
1
2
CAUTION: Incorrect voltage may cause fire or seriously damage the unit.
GFCI
GFCI
Transformer
50VA
120/24V
C.T. (Current transformer) Internal connections
See
Appendix 1
Heater load connection
277V, 30A max.
Main supply
120V
Third-party
ice/snow
sensor
(optional)
PYROULS
Upper limit
temp. sensor
(by STELPRO)
PYROSENSE
Snow sensor
(by STELPRO)
Internal connections
Branch circuit protection
and disconnect provided by
installer
30A, 277V max.
Black
Black
Red Red
White
Blue
White
Shield wire
PYROBOX3

6
R
C
A
B
A,B
R,C
A,B
R,C
1
2
Zone 1 Zone 2 Zone 3 Zone 4
PYROSENSE
The system can be congured to operate with 1, 2, 3 or 4
snow sensors.
Each snow sensor must have a different MAC address to
communicate with the main board. The PYROSESE snow
sensors series includes 4 different part numbers; each is fac-
tory pre-congured with a unique MAC address as follows:
PYROSENSE MAC adress 1
PYROSENSE2 MAC adress 2
PYROSENSE3 MAC adress 3
PYROSENSE4 MAC adress 4
IMPORTANT! When connecting more than one sensor,
snow sensor 1 must be connected last in the communi-
cation line.
The snow sensors will control zones according to the
following logic:
Number of
sensors connected Sensor # Zones controlled
by the sensor
1 1 1,2,3,4,5*
2
1 1,2
2 3,4,5*
3
1 1
2 2
3 3,4,5*
4
1 1
2 2
3 3
4 4,5*
*Zone5 - optionnelle
CONNECTING SNOW SENSORS TO THE SYSTEM
Power cable (R,C)
18 AWG – Up to 500ft / 150m
12 AWG – Up to 1000ft / 300m
THE PYROSENSE COMES WITH:
1. A plastic cap, to protect the sensor from dust and debris for when the sensor is not
in use (off season).
IMPORTANT! The protective cap must be removed before using the sensor. If
the protective cap is not removed, the sensor will not detect snow!
2. Plastic spikes, to be used if necessary, to keep birds off the sensor.
½in. NPT
Cable length from
PYROSENSE
3.28 ft / 1 m
JBOX and Conduits
(supplied by installer)
Shield Shield
Shield
Communication cable (A,B)
Jacketed shielded twisted pair
120 Ohm,
18 AWG – Up to 500 ft / 150 m
NOTES:
• The number of snow sensors connected must be
congured in section P09 of the technician settings.
• When one of the snow sensors cannot be viewed through
communication (faulty or not connected), the values on
snow sensor 1 will be used instead.
From
system

7
GREEN POWER LIGHT
The green power light will be on when power is supplied to
the unit (120 VAC).
HEATER INDICATOR
The number beneath the heater icon indicates the heater
stage (1 to 5).
RED GROUND FAULT RESET
LAMP AND BUTTON
The red GROUND FAULT RESET light will be on when
the internal GFCI is tripped. Press and hold the GROUND
FAULT RESET button for 5 seconds to reset the unit.
SNOWFLAKE ICON AND
DIGITAL TIME INDICATOR
A solid snowake icon will appear on the display while
sensing snow and during normal heater operation.
A blinking snowake icon will appear on the display during
heater off delay or when manual mode is activated. The
digital clock will count down the remaining time until the
heaters are turned off.
The snowake icon will disappear from the display as long
as the heaters are turned off.
FONCTIONS
Heater ON
Stage 1 Stage 2 Stage 3 Stage 4 Stage 5
Heater OFF
DISPLAY
FONCTIONS
TURNING THE SYSTEM
ON AND OFF
• Press and hold the [ON] button for 0.5
seconds to turn the system ON or OFF.
• The words “ON” or “OFF” will appear on
the display.
SELECTING
TEMPERATURESCALE
• Press the [+] button for Celsius.
• Press the [-] button for Fahrenheit.
SELECTING AUTOMATIC
ORMANUAL MODE
• Press the [SELECT] button to switch
between modes:
Automatic
Heating will start and stop automatically
depending on snow detection by the snow
sensor/sensors.
Manual ON
Heating will start regardless of snow sensor
measurements and will stop after a preset
time (refer to the “Manual ON” section in the
technician settings – P05 ).
Note: The mode will always return to “Auto-
matic” after switching the unit OFF and ON.
OPERATING INSTRUCTIONS

8
USE THE TECHNICIAN SETTINGS MODE TO VIEW AND
ADJUST THE FOLLOWING PARAMETERS:
P01 Temperature setpoint
P02 Low ambient temperature limit to stop heaters
P03 Energy saving, upper slab temperature limit to stop heaters
P04 Time delay before stopping the heaters
P05 ON time for manual mode
P06 Heater cycle / splitting time
P07 Sensor and heater control logic
P08 Snow sensor sensitivity
P88 Snow detection threshold
P09 Number of snow sensors connected
P10 Commissioning / Test mode
Restore defaults
1. Move DIP switch S1 located on the side of
thermostat to ON position.
2. Press the [SELECT] and [+] buttons simultaneously
to move forward to the next technician parameter.
3. Press the [SELECT] and [-] buttons simultaneously
to return to the previous technician parameter.
Move DIP switch S1 located on the side of thermo-
stat to OFF position
1ENTER TECHNICIAN
SETTINGSMODE 2SAVE CHANGES AND EXIT
TECHNICIAN SETTINGS MODE
IMPORTANT: Changes made to technician
parameters will not take effect as long as DIP
switch S1 is in ON position.
Enter technician
settings mode
Save changes and exit
technician settings mode
TECHNICIAN SETTINGS

9
temperature
on heaters
sensor
Upper limit
temperature
Set point
enabled
P03
disabled
Low limit
Temperature
P02
enabled
P02
disabled
temperature
on heaters
sensor
Upper limit
temperature
Set point
enabled
P03
disabled
Low limit
Temperature
P02
enabled
P02
disabled
temperature
on heaters
sensor
Upper limit
temperature
Set point
enabled
P03
disabled
Low limit
Temperature
P02
enabled
P02
disabled
temperature
on heaters
sensor
Upper limit
temperature
Set point
enabled
P03
disabled
Low limit
Temperature
P02
enabled
P02
disabled
temperature
on heaters
sensor
Upper limit
temperature
Set point
enabled
P03
disabled
Low limit
Temperature
P02
enabled
P02
disabled
1. Move DIP switch S1 located on the side of thermostat to ON
position to enter technician settings mode.
2. “P01” and the temperature setpoint will appear on the display.
3. Use the [+] and [-] buttons to adjust the temperature setpoint.
Range: 19…45°F / -7…+7°C
1. Press the [SELECT] and [+] buttons simultaneously. “P02”and the low
limit temperature will appear on the display. When the temperature
on the temperature sensor drops below the low temperature limit, the
heating system will stop.
2. Use the [+] and [-] buttons to adjust the temperature setpoint.
Range: -4…+23°F / -20…-5°C, Default: -4°F / -20°C
3. Press the [SELECT] and [+] buttons simultaneously again.
The word “ON” or “OFF” will appear on the display.
4. Use the [+] and [-] buttons enable (ON) or disable (OFF) the P02 parameter.
If disabled, the heating system will operate without low temperature limitations.
1. Press the [SELECT] and [+] buttons simultaneously.
“P03” and the slab upper limit temperature will appear
onthe display.
2. Use the [+] and [-] buttons to adjust the upper limit
temperature. Range: +41…+125°F / +5…+52°C
Default: 125°F / +52°C (For numbers above 100, “100”
willappear on the display.)
3. Press the [SELECT] and [+] buttons simultaneously again.
The word “ON” or “OFF” will appear on the display.
4. Use the [+] and [-] buttons enable (ON) or disable (OFF) the P03 parameter. If disabled, the heaters will work regardless
of the upper limit.
5. Press the [SELECT] and [+] buttons simultaneously again. The display will show the temperature on the upper limit
sensor.
As long as the ambient temperature is lower than the temperature setpoint P01,
the PYROCON will turn ON upon receiving a positive snow signal from the snow detector.
P01 TEMPERATURE SETPOINT
P02 LOWER LIMIT TEMPERATURE FOR HEATING
P03 UPPER LIMIT TEMPERATURE FOR HEATING
Ambient
temperature
sensor Temperature
setpoint
Low limit
Temperature
Upper limit
temperature
P02
enabled
P03
enabled
P02
disabled
P03
disabled
Temperature on
heater sensor(s)
Snow
detector

10
Splitting time
Time delay
hours
Time delay
minutes
Manual ON
hours
Manual ON
minutes
Splitting time
Time delay
hours
Time delay
minutes
Manual ON
hours
Manual ON
minutes
Splitting time
Time delay
hours
Time delay
minutes
Manual ON
hours
Manual ON
minutes
Splitting time
Time delay
hours
Time delay
minutes
Manual ON
hours
Manual ON
minutes
Splitting time
Time delay
hours
Time delay
minutes
Manual ON
hours
Manual ON
minutes
1. Press the [SELECT] and [+] buttons simultaneously. “P04”, “dL” and the time delay
before stopping the heaters (Hold ON) will appear on the display. The hours will blink.
2. Use the [+] and [-] buttons to adjust the hours of the time delay. Range: 00...99 hours.
Default: 00 hours
3. Press the [SELECT] and [+] buttons simultaneously again. The minutes will blink.
4. Use the [+] and [-] buttons to adjust the minutes of the time delay. Range: 00...59
minutes. Default: 30 minutes
Note 1. The time delay countdown will start when the snow detection signal from snow sensor will switch from positive
to negative.
Note 2. The staggering sequence will continue during the time delay period.
1. Press the [SELECT] and [+] buttons simultaneously. “P05”, “On” and the “Manual
ON” mode time period will appear on the display. The hours will blink. The time delay
parameter denes a timeframe in which the heaters remain ON after receiving a “Manual
ON” command.
2. Use the [+] and [-] buttons to adjust the hours of the working time.
Range: 00...99 hours. Default: 6 hours
3. Press the [SELECT] and [+] buttons simultaneously again. The minutes will blink.
4. Use the [+] and [-] buttons to adjust the minutes of the working time.
Range: 00...59 minutes. Default: 00 minutes
1. Press the [SELECT] and [+] buttons simultaneously. “P06”, “SP” and the splitting time will
appear on the display. The minutes will blink. The heater cycle / splitting time parameter
denes the working time of the heaters when working in sequence. Example: The splitting
time is set to 10 minutes, and 4 heaters work in sequence. Each heater will be ON for
2.5minutes (10/4=2.5).
2. Use the [+] and [-] buttons to adjust the splitting time. Range: 10...1999 minutes.
Default:24minutes.
P04 TIME DELAY BEFORE STOPPING THE HEATERS
P05 MANUAL MODE ON TIME
P06 HEATER CYCLE AND SPLITTING TIME
Heures de
laminuterie
Manual ON
hours
Minutes de
laminuterie
Manual ON
minutes
Splitting time

11
Snow sensor
sensitivity
Number of
snow sensors
Test
conditions
mode
Save changes
and return to
normal display
Snow detection
threshold
1. Press the [SELECT] and [+] buttons simultaneously. “P07”
and the gures “0,” “1,” “2” or “3” will appear on the
display.
2. Use the [+] and [-] buttons to dene the heater logic
(model dependent) as follows:
PYROBOX3 | Outputs 1, 2, 3 and 5
Value Outputs controlled
by PYROSENSE
Outputs controlled by
third-party party sensor Comments
0 All outputs - Default
1 1, 2, 3 5
2 - All outputs The display will not show the ambient temperature and will remain blank.
3 1, 2, 3, 5 Snow on any of the sensors will trigger all zones.
PYROBOX3C | Outputs 1, 2 and 5
Value Outputs controlled
by PYROSENSE
Outputs controlled by
third-party party sensor Comments
0 All outputs - Default
1 1, 2 5
2 - All outputs The display will not show the ambient temperature and will remain blank.
3 1, 2, 5 Snow on any of the sensors will trigger all zones.
PYROBOX5 | Outputs 1, 2, 3, 4 and 5
Value Outputs controlled
by PYROSENSE
Outputs controlled by
third-party party sensor Comments
0 All outputs - Outputs 4 and 5 will turn ON or OFF together. Default.
1 1, 2, 3, 4 5
2 - All outputs The display will not show the ambient temperature and will remain blank.
3 1, 2, 3, 4, 5 Snow on any of the sensors will trigger all zones.
Note: Third-party sensors – i.e. gutter or pavement sensors – CIT, GIT, SIT.
P07 HEATER OUTPUT LOGIC CONTROLLED BY PYROSENSE SNOW MELT
OR THIRD-PARTY SENSOR
1. Press the [SELECT] and [+] buttons simultaneously.
“P08” and the snow sensor sensitivity value will appear on the display.
2. Use the [+] and [-] buttons to adjust the sensitivity.
Range: 20...80 % (20% - Less sensitive, 80% - more sensitive). Default: 50%
P08 SNOW SENSOR SENSITIVITY
Snow sensor
sensitivity

12
Snow sensor
sensitivity
Number of
snow sensors
Test
conditions
mode
Save changes
and return to
normal display
Snow detection
threshold
Snow sensor
sensitivity
Number of
snow sensors
Test
conditions
mode
Save changes
and return to
normal display
Snow detection
threshold
Snow sensor
sensitivity
Number of
snow sensors
Test
conditions
mode
Save changes
and return to
normal display
Snow detection
threshold
Snow sensor
sensitivity
Number of
snow sensors
Test
conditions
mode
Save changes
and return to
normal display
Snow detection
threshold
1. Press the [SELECT] and [+]
buttons simultaneously. “P88”
and the snow sensor threshold
will appear on the display.
2. Use the [+] and [-] buttons to
adjust the threshold. Range:
00...60 minutes. Default:
1minute. If the threshold is not
reached, snow detection will
not affect the logic for turning the heaters ON
or OFF. During countdown to threshold time,
thesnowake icon will ash.
1. Press the [SELECT] and [+]
buttons simultaneously. “P09”
and the number of snow
sensors connected will appear
on the display.
2. Use the [+] and [-] buttons
to select 1, 2, 3 or 4 snow
sensors. Default: 1
Turn ON test conditions to check the functionality of the system regardless of sensor parameters (i.e.
during the summer). In test conditions, the ambient temperature is always -5°C/23°F.
Note: To trigger the system and activate the heaters, use some water to wet the circuit on top of the
snow sensor.
1. Press the [SELECT] and [+] buttons simultaneously. “P10” will appear on the display. The hours will
blink.
2. Use the [+] button to enter test/commissioning mode – “Test” will appear on the display.
3. Use the [+] button to manually exit test/commissioning mode – “Test” will disappear from display.
Note: If the technician did not manually exit test/commissioning mode, the unit will automatically
return to normal mode after 5 hours.
P88 SNOW DETECTION THRESHOLD P09 NUMBER OF SNOW
SENSORSCONNECTED
P10 TEST CONDITIONS MODE / TECHNICIAN COMMISSIONING MODE
Snow detection
threshold
Number of snow
sensors
Test conditions
mode
IMPORTANT: Make sure the unit is turned
OFF (the word “OFF” should appear on
thedisplay).
1. Move DIP switch S1 to ON position.
2. Press and hold the [ON] button for 10 seconds.
The thermostat will beep.
3. Move DIP switch S1 back to OFF position.
RESTORE DEFAULT VALUES
SAVE CHANGES AND RETURN
TO NORMAL DISPLAY
Move DIP switch S1 back to
OFF position.
Save changes and
return to normal display

13
Selected
zone
Enabled
zone
Disabled
zone
Short measuring
times (test)
Normal operation
Short measuring
times (test)
Normal operation
1. Turn the unit OFF.
2. While OFF, press the [+] and [-] buttons simultaneously for 10 seconds.
3. Press the [Select] button to select zone. Selected zone will ash.
4. Press the [+] and [-] buttons to enable/disable the selected zone.
-Black icon and “ON” on LCD - Enabled zone.
-White icon and “OFF” on LCD - Disabled zone.
5. Press and hold the [+] and [-] buttons simultaneously for 5 seconds to exit.
Note: Disabled zones will be ignored in splitting time calculations.
Example: The splitting time is set to 60 minutes, and heaters are set to work in sequence. 3 Heaters enabled and
1heater disabled.
With all heaters enabled: Each heater will be ON for 15 minutes (60/4=15).
With 3 heaters enabled and 1 heater disabled: Each heater will be ON for 20 minutes (60/3=20).
ENABLE/DISABLE ZONES
Use DIP switch S2 to short the measuring times as follows:
• “ON” – Short measuring times – for test/commissioning only
(measuringtimes will be divided by 60).
• “OFF” – Normal operation.
Short measuring times:
One real hour will take one minute, and a one real minute will take one second.
DIP SWITCH S2 – SHORT MEASURING TIMES (TEST ONLY)
Short measuring
times (test)
Normal operation
S3 OFF, S4 OFF
All 4 outputs work per request
from the snow sensor(s).
S3 OFF, S4 ON
Outputs 1 and 3 and outputs
2and 4 work together (according
tosplitting time).
DIP SWITCHES S3 AND S4
HEATER SEQUENCING LOGIC
Use DIP switches S3 and S4 to dene the sequencing logic of the heater (zones) as follows:
Enabled
zone
Selected
zone
Disabled
zone
Zone
désactivée
Note: Do not use this conguration with more than two
snow sensors connected.

14
S3 ON, S4 OFF
Outputs 1, 2 and 3 work in sequence (according to splitting time), and output 4 works continuously.
Note: Do not use this conguration with more than two snow sensors connected.
S3 ON, S4 ON
All 4 outputs work in sequence (according to splitting time).
Note: Do not use this conguration with more than two snow sensors connected.
Notes:
1. The illustrations above show the heater operation for
PYROBOX5. The logic remains the same for PYROBOX3C,
without heaters 3 and 4, and for PYROBOX3, without
heater4.
2. Heater 5, for all models, will be activated with or without
heater 4, depending on the “Heater output logic” parameter
set in section P07.
3. The logic will ignore disabled zones.
TEMPERATURE READING ERRORS
Ambient temperature sensor readings (on snow sensor) are outside reliable
measuringrange.
Ambient temperature < -9°F/-23°C, ambient temperature > 54°F/12°C
The system will continue to operate using constant predened values. In addition, the display
will alternate between “LO” and -11°F/-24°C for low temperature readings and between “HI”
and 55°F/13°C for high temperature readings.
“SensErr 1” will appear on the display.
If the system is congured to work with more than one snow sensor, the faulty snow
sensor number will appear on the display: P01, P02, P03 or P04.
The system will use readings from snow sensor 1 instead of the missing readings from
the faulty snow sensor.
Communication error
with snow sensors
1COMMUNICATION ERROR WITH ONE (OR MORE) SNOW SENSORS
ERROR

15
12
NO
NC COM
10
20
30
40
50
100
90
80
70
60
MIN MAX
“SensErr 2” will appear on the display. The system will continue to operate regardless of the upper
limit temperature.
Required actions:
1. Refer to P03 section of the technician settings.
2. Check the temperature value and disable the sensor if needed.
3. Replace the sensor. Upper limit temperature
sensor error
2UPPER LIMIT TEMPERATURE SENSOR IS NOT
CONNECTED OR HAS SHORT CIRCUITED.
ERROR
The GFCI (ground fault circuit interrupter) is designed to provide protection for electrical equipment. The “ON” time delay and
current trip should be congured to match application requirements.
APPENDIX 1
CALIBRATING AND TESTING THE INTERNAL GFCI
TIME DELAY
“ON” time delay
Turn clockwise to increase and
counter-clockwise to decrease
(Default: Minimal timedelay)
Tripped relay LED indicator
Current trip – % full scale
Model dependent – see table (Default: 20%)
SUPPLY
Remote C.T.
DANGER
HIGH VOLTAGE
GROUND
FAULT
SENSOR
TRIPPED
CURRENT TRIP
% FULL SCALE
GFCI TEST
The GFCI should be tested monthly. Press the red GFCI
TEST button located next to the R,C terminals inside
the box for three seconds to trip the outlet and break
the circuit. The RED internal LED on the GFCI and the
RED external lamp on the box door should be lit. Press
the RESET GFCI button on the box door for ve sec-
onds to return to normal operation and reset power
andprotection.
INDICATOR (%) CURRENT TRIP (AMPS)
PYROBOX5 PYROBOX3/3C
10 0.1 0.01
20 0.2 0.02
30 0.3 0.03
40 0.4 0.04
50 0.5 0.05
60 0.6 0.06
70 0.7 0.07
80 0.8 0.08
90 0.9 0.09
100 1.0 0.10

16
WWW.STELPRO.COM
CONT[email protected]
1-844-STELPRO
STELPRO DESIGN INC.
Saint-Bruno-de-Montarville, Québec, Canada, J3V 6L7
STELPRO LIMITED WARRANTY
This limited warranty is offered by Stelpro Design Inc. (“Stelpro”)
and applies to the following product made by Stelpro: model
PYROBPX.
Please read this limited warranty carefully. Subject to the terms of
this warranty, Stelpro warrants its products and their components
against defects in workmanship and/or materials for the following
periods from the date of purchase: 2 years. This warranty applies
only to the original purchaser; it is non-transferable and cannot be
extended.
CLAIM PROCEDURE
If at any time during the warranty period the unit becomes defec-
tive, you must cut off the power supply at the main electrical
panel and contact 1) your installer or distributor, 2) your service
center or 3) Stelpro’s customer service department. In all cases,
you must have a copy of the invoice and provide the information
written on the product nameplate. Stelpro reserves the right to
examine or to ask one of its representatives to examine the prod-
uct itself or any part of it before honoring the warranty. Stelpro
reserves the right to replace the entire unit, refund its purchase
price or repair a defective part. Please note that repairs made
within the warranty period must be authorized in advance in writ-
ing by Stelpro and carried out by persons authorized by Stelpro.
Before returning a product to Stelpro, you must have a Stelpro
authorization number (RMA). To obtain it, call the customer ser-
vice department at: 1-844-STELPRO. The authorization number
must be clearly written on the parcel or it will be refused.
CONDITIONS, EXCLUSIONS AND
DISCLAIMER OF LIABILITY
This warranty is exclusive and in lieu of all other representations
and warranties (except of title), expressed or implied, and
Stelpro expressly disclaims and excludes any implied warranty
of merchantability or implied warranty of tness for aparticular
purpose.
Stelpro’s liability with respect to products is limited as provided
above. Stelpro shall not be subject to any other obligations or
liabilities whatsoever, whether based on contract, tort or other
theories of law, with respect to goods or services furnished by it,
or any undertakings, acts or omissions relating thereto. Without
limiting the generality of the foregoing, Stelpro expressly dis-
claims any liability for property or personal injury damages, penal-
ties, special or punitive damages, damages for lost prots, loss
of use of equipment, cost of capital, cost of substitute products,
facilities or services, shutdowns, slowdowns, or for other types of
economic loss or for claims of a dealer’s customers or any third
party for such damages. Stelpro specically disclaims all conse-
quential, incidental and contingent damages whatsoever.
This warranty does not cover any damages or failures resulting
from: 1) a faulty installation or improper storage; 2) an abusive or
abnormal use, lack of maintenance, improper maintenance (other
than that prescribed by Stelpro) or a use other than that for which
the unit was designed; 3) a natural disaster or an event out of
Stelpro’s control, including, but not limited to, hurricanes, torna-
does, earthquakes, terrorist attacks, wars, overvoltage, ooding,
water damages, etc. This warranty does not cover any accidental
or intentional losses or damages, nor does it cover damages
caused by negligence of the user or owner of the product. More-
over, it does not cover the cost of disconnection, transport, and
installation.
The warranty is limited to the repair or the replacement of the unit
or the refund of its purchase price, at the discretion of Stelpro.
Any parts replaced or repaired within the warranty period with
the written authorization of Stelpro will be warranted for the
remainder of the original warranty period. This warranty will be
considered null and void and Stelpro will have the right to refuse
any claims if products have been altered without the written
authorization of Stelpro and if the nameplate numbers have been
removed or modied. This warranty does not cover scratches,
dents, corrosion or discoloration caused by excessive heat,
chemical cleaning products and abrasive agents. It does not
cover any damage that occurred during the shipping.
Some states and provinces do not allow the exclusion or limita-
tion of incidental or consequential damages and some of them
do not allow limitations on how long an implied warranty lasts, so
these exclusions or limitations may not apply to you. This war-
ranty gives you specic legal rights and you may have other rights
which vary from state to state or from province to province.