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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 snowflake icon will flash.

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

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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