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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 snowflake icon will appear on the display while 
sensing snow and during normal heater operation.
A blinking snowflake 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 snowflake 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

Summary of Contents for PYROBOX3

Page 1: ...he circuit amperage draw as specified 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 regulatio...

Page 2: ...al 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 stag...

Page 3: ...actors 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 specified in...

Page 4: ...manual 2 1 A C C R C B R L1 N1 R F 5A R IN IN 1 2 A 1 A C1 B 1 B C A 1 A C1 B 1 B C IMPORTANT If the heaters are connected in a star configuration the neutral must pass through the internal current tr...

Page 5: ...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 ma...

Page 6: ...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 prot...

Page 7: ...ters are turned off The snowflake 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 TU...

Page 8: ...missioning 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 paramet...

Page 9: ...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 t...

Page 10: ...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 parame...

Page 11: ...l 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 controll...

Page 12: ...urn 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...

Page 13: ...e 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...

Page 14: ...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 ambie...

Page 15: ...NTERNAL 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 ta...

Page 16: ...shed 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 pe...

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