HBX SNO-0111 User manual

HBX Control Systems Inc.
Installation Manual
Socket and Cover Plate 0111
Snowmelt Sensor 0110

HBX Snowmelt Sensor
Page 2
TABLE OF CONTENTS
Introduction ............................................................................................ 1
Description ...............................................................................................1
Safety Symbols & Warnings ................................................................... 1
Receipt & Inspection .............................................................................. 1
Technical Data ........................................................................................2
Dimensions ...............................................................................................2
Installation and Wiring .............................................................................3-6
Installation ..................................................................................................3
Wiring .........................................................................................................5
Testing and Troubleshooting Procedure..................................................7-8
SNO-0110 - Testing .....................................................................................7
SNO-0110 - Troubleshooting .....................................................................7-8
Warranty Information ................................................................................9
Index

HBX Snowmelt Sensor
© HBX Control Systems Inc. 2012 Page 3
RECEIPT & INSPECTION
The SNO-0110/SNO-0111 has gone through rigorous
quality control tests at the factory before shipment.
After receipt and before installation perform the
following checks:
Receipt
After receiving, inspect the unit for any possible
physical damage that may have occurred during
transportation.
Inspection
After unpacking the unit make sure the boxes
contain:
SNO-0110 Package:
 Optical snowmelt sensor
 100 feet of 22AWG 2 pair shielded cable
SNO-0111 Package:
 Sensor socket
 Cover plate (dud sensor)
 4 x Stainless steel 4 x 25mm machine screws
 Remote Slab Sensor
DESCRIPTION
Together the SNO-0110 (sensor & cable) and the
SNO-0111 (socket and cover plate) make up the
sensor portions of the HBX Snowmelt System. The
SNO-0110 snow/ice sensor is an optical design that
is capable of sensing snow conditions. This allows
the user to set a preferred starting condition for
the snowmelt system. The SNO-0110 is design to
be mounted in the slab however because of the
optical design it can also be remotely installed.
The SNO-0111 socket and cover plate allows for the
concrete, asphalt, etc. to be poured prior to the
installation of the Snowmelt Control, and the SNO-
0110 snow/ice sensor.
    
formal training in electrical and HVAC
controls should attempt the installation
     
     
       
    
codes and practices applicable to the
jurisdiction for the actual installation.
SAFETY SYMBOLS & WARNING
Point of Interest

or brings your attention to an action
that may have adverse effects on the
installation process.
Moderate Hazard
This action may cause personal injury or
have adverse effects on the installation
process if handled incorrectly.


mechanical drawing at the back of the
manual.
INTRODUCTION
This manual will help with the installation, parameter setting, troubleshooting and general maintenance
requirements for the snowmelt sensor, socket and cover plate. To guarantee the safe and reliable operation

warnings.
HBX SNO-0111/ SNO-0100 SNOWMELT SENSOR/ SOCKET AND COVER PLATE

HBX Snowmelt Sensor
Page 4
Nameplate Information:
     

some of the basic features. The label displays the
serial number which will match the serial number
on the SNO-XXXX Control, the lot number, the bar
code and the product’s ETL number.
TECHNICAL DATA AND DIMENSIONS
TECHNICAL DATA
Materials:
Polycarbonate and brass
Weight:
0.45 KG (1.00 lb)
Socket Dimensions:
140mm W x 103mm H x 140mm D
Sensor Dimensions:
100mm W x 38mm H x 100mm D
ETL Listings:
Meets CSA C22.2 No. 24
Meets UL Standard 873
ETL Control No. 3068143
DIMENSIONS
82 mm
140 mm
140 mm
140 mm
103 mm
100 mm
Side ViewTop View
SNO-0110
SnowMelt Sensor
and Cable
SNO-0110
SnowMelt Sensor and Cable
Made In
Canada
3068143
Lot#000000000
Serial #:00000000
Date: 00-00-0000
V1.02
100 mm
38 mm

HBX Snowmelt Sensor
© HBX Control Systems Inc. 2012 Page 5
INSTALLATION AND WIRING
INSTALLATION:
1. Slab Sensor Location
Installing the sensor at the correct location in the slab is
critical for a properly functioning snow/ice melting system.
The sensor should be located where snowfall is normal and
not affected by surrounding buildings. Also, the sensor must
not be installed where standing water could accumulate
on its surface.
The sensor location should also be halfway between the

1). There is a thermistor built into the sensor that senses the
slab temperature at all times. Keeping the sensor away
from pipes in the slab ensures the accurate operation of
your snow/ice melting system.

When mounting the socket and cover plate in the snowmelt
slab use rebar mounted in the soil below to level the socket
and cover plate so that the cover plate is level with the

When the socket and cover plate are level use a screw to

Failure to mount the socket properly may result in
incorrect or faulty sensor readings.
i) Ramp Mounting
The socket and cover plate can also be mounted on a
ramp. Make sure to locate the socket and cover plate near
the bottom of the ramp. This will allow for proper ice melting

ii) Brass Plugs
On the socket there are 4 brass plugs. These plugs are
designed to make contact with the brass ring on the sensor
so the sensor can get proper slab temperatures. Take care
not to press these plugs in or out as they are properly set
at the factory. Manipulation of the plugs may result in the

Take special care to clean the brass surfaces on the inside
of the socket. Making sure to clean any concrete that may
have accumulated on them. Failure to do so may result in
the sensor not making proper contact and not reading the
slab temperature properly.
Figure 1 - Snowment sensor location
Figure 2 - Leveling the socket and cover plate
Figure 3 - Tightening the socket onto the rebar
Top of Slab
Heating Pipe
Rebar
Underslab
Insulation Compact
Base

HBX Snowmelt Sensor
Page 6
b) Placing Concrete
A plastic cover is provided with the socket to prevent it from


          

the concrete. Also insure that the mounting plate drainage hole
remains unplugged once the concrete has cured.
          

c) Installing the Sensor
          
snow/ice sensor. Clean any excess debris from inside the socket.
Fish the snow/ice sensor wire through the pre-installed pipe.

Once the snow/ice sensor is properly inserted into the socket put
the four screws back in place to secure it.


is pressed into place prying up the sensor to line up the

the socket.
2. Remote Sensor Location
The optical nature of the snow/ice sensor allows for mounting
somewhere other than the slab (i.e. a roof or fence post). This is
possible, but take special care that it is not mounted in an area
where the surroundings cause an abnormal amount of snow fall.

remote sensor.
When remote mounting the sensor an external slab
sensor must be used in order for the control to be able
to read the slab temperature. The temperature sensor on

You must select the control setting for remote slab to yes (i.e. ‘Y’).
This will let the control know that you have remotely mounted the
snow/ice sensor. See the proper snow control manual for more
information. See drawing 2 (Page 6) for the correct wiring of a
remote slab sensor.
Please ensure that you drill a hole
through the bottom of the socket for

       
       

Brass
Plug
Figure 4 - Ramp Mounting
Figure 5 - Brass Plug
DRILL
HERE

HBX Snowmelt Sensor
© HBX Control Systems Inc. 2012 Page 7
Figure 6 - Snowmelt sensor installation
Snowmelt Module
Sensor: 12VDC SNO-0100
SNO-0100
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D
D
D
D
D
D
D
D
D
D
D
D
D
Input: 120VAC 60Hz 5A
Relays: 240VAC10A
Demand Signal: 20- 240V
Model: CPU- 1000
CAUTION, RISK OF ELECTRICAL SHOCK - DISCONNECT POWER PRIOR TO SERVICING
Certifiedto CSA C22.2 No 24
Conformsto UL Standard 873
Central Processing Unit
SNO-1000
3. Maintenance
In order to ensure the long term accuracy of your snow/ice melting system you should clear away any mud,
rocks, or other debris that might obstruct the sensors optics.
In the unlikely event that the sensor becomes inoperable carefully remove it from the socket and follow the
installation procedure to install a new sensor.
WIRING:


Take special care that the sensor wire is not run with any high voltage wiring as this may result in faulty
readings. The sensor is supplied with 100 feet of 22 awg shielded cable. If the sensor is more than 100 feet
from the control extend the wire from the end of the sensor wire. 
 When extending the cable use 18AWG shielded cable. If possible, use
2 pair shielded 18AWG for best results. You must also extend the shield wire and attach it to the same point
as the black wire on the SNO-0100 or SNO-0500. If you don’t the temperature sensor in the SNO-0110 will not
work properly.



HBX Snowmelt Sensor
Page 8
SNO-0110 - DRAWING 001
SLAB SNOW/ICE SENSOR WIRING WITH A
SNO-1000/0100
SNO-0110 - DRAWING 003
SLAB SNOW/ICE SENSOR WIRING WITH A
SNO-0500
SNO-0110 - DRAWING 002
REMOTE INSTALL - SNOW/ICE SENSOR WITH
A SNO-1000/0100
SNO-0110 - DRAWING 004
REMOTE INSTALL - SNOW/ICE SENSOR WITH
A SNO-0500



the system to meet all necessary codes for the jurisdiction of the actual installation.
SNOWMELT MODULE
SNO-0100
120 121110
1
S32
123
T12
4
20m
110
2
1
1
1413
TT
12
DO NOT
CONNECT
POWER
HERE
48
ee
ed
ie
e
Sied
ie
o e e ie d
wi e e S 0100


HBX
GR
120
16
N
L
1514
11
DM
32
2
TM TM
134
BL
1
BL
65
1
2A
DO NOT
CONNECT
POWER
HERE
2
13
C
1
1211
1C
SG
32
8
PW TM
7910
10 A 10 A
SHIELD
GREEN
RED
WHITE
BLACK
SNOWMELT MODULE
SNO-0100
120 121110
1
S32
123
T12
4
20m
110
2
1
1
1413
TT
12
DO NOT
CONNECT
POWER
HERE
e eo
mo ed i owme i
ee
ed
ie
S ie d wi e doe
o eed o e
oo ed p
48


HBX
GR
120
16
N
L
1514
11
DM
32
2
TM TM
134
BL
1
BL
65
1
2A
DO NOT
CONNECT
POWER HERE
2
13
C
1
1211
1C
SG
32
8
PW TM
7910
10 A 10 A
Do not use shield
wire or white wire for
this configuration
External slab sensor
installed in snow-melting
slab (sold separately – HBX
029-0022 10K Sensor)
GREEN
RED
BLACK

HBX Snowmelt Sensor
© HBX Control Systems Inc. 2012 Page 9
TESTING AND TROUBLESHOOTING PROCEDURE
T
T
T
º
F
º
C
º
F
º
C
º
F
º
C
- 22 - 30 177,000 - 0.4 - 18 86,463 21.2 - 6 44,617
- 18.4 - 28 156,404 3.2 - 16 77,162 24.8 - 4 40,153
- 14.8 - 26 138,482 6.8 - 14 68,957 28.4 - 2 36,182
- 11.2 - 24 122,807 10.4 - 12 61,711 32 0 32,654
- 7.6 - 22 109,075 14 - 10 55,319 35.6 2 29,498
- 4 - 20 97,060 17.6 - 8 49,640 39.2 4 26,686
SNO-0110 - TESTING
1. Thermistor Test
Resistance table for thermistors (outdoor, system)

I. Heater Element Resistance Test
With the sensor unplugged, measure the resistance between the Red wire and the black wire. The result
should be around 23 Ohms with all 100 feet of wire attached.
II. Slab Sensor Test
Using the above table measure the resistance of the white and shield wires. This will give you the slab
sensor reading when the heater is not ON. Take note if the heater was ON and the snowmelt sensor is

III. Heater Element Voltage Test
With the sensor plugged into the control (make sure heater is ON) check the voltage from Red to Black.
The voltage should be around 17 VDC.
SNO-0110 - TROUBLESHOOTING

1. Problem: The slab temperature displayed on the control is very high or shows sensor error.
Status Screen: Slab Temperature: 185 ºF or sensor error.
Explanation: The control is no longer able to read the slab sensor due an open circuit. In this case the control
assumes a slab temperature of t and continues operation, but will not turn On the boiler contacts or injection
pump or system pump.
Solution: Verify the system sensor connection as described in the Installation Manual of the SNO-0111/SNO-
0110.
2. Problem: The snow melt sensor surface temperature is too high and is possibly affecting the slab
temperature.

HBX Snowmelt Sensor
Page 10
Explanation: Inside the snow melt sensor is a heater and the function is to melt the snow on top of the sensor to
measure the percentage of snowfall rate based on the snow landing on the sensor. The temperature emitted by
the heater has already been taken into account when calculating the slab temperature. The heater will put 40 ºF
into the slab temperature when the heater is ON.
3. Problem: The slab temperature displayed on the screen differs from the actual temperature of the slab and will
not activate the SNO-0500 when its necessary.
Explanation:

reading the slab temperature properly due a improper wicking of the heater to the concrete.

in overheating the sensor.

more than the 40 ºF degrees designed.
Solution

temperature showed by the SNO -0500 and the slab.
 
options so the control knows it’s using a remote slab sensor and will no longer look at the slab sensor built into the
optical sensor but the new one in the slab. Set the SLAB SENSOR LOCATION to REM from INT. Also take note of the
drawing below to determine the proper installation of the remote sensor to the control.