HBX SNO-0500 User manual
HBX Control Systems Inc.
Installation Manual
SNO-0500
Version 1.04
SNO-0500
HBX SNO-0500 HVAC Control
Version 1.04
Control Systems Inc.
Comfort
Control
Innovation
HBX SNO-0500 HVAC Control
Version 1.04
Table of Contents
Control Systems Inc.
Comfor
t
Contro
l
Innovation
HBX SNO-0500 HVAC Control
Version 1.04
TABLE OF CONTENTS
Introduction ............................................................................................ 3
Safety Symbols & Warnings ................................................................... 3
Receipt & Inspection .............................................................................. 3
Description ...............................................................................................4
Technical data ........................................................................................ 5
Dimensions ............................................................................................... 5
Wiring and Installation .............................................................................6
Wiring .........................................................................................................6
Installation ................................................................................................ 6
Programming HBX SNO-0500 ................................................................7-18
Multicolour Backlit Display ......................................................................7
Dial Operation & Set/Status Mode ........................................................7
Programming Scroll Mode ..................................................................... 8
Programming Change Mode ................................................................8
Status Screens ..........................................................................................8
Snowmelt Programming...........................................................................9-11
Sample Wiring and Mechanical Diagrams ..........................................12-13
Testing and troubleshooting procedure..................................................16-18
SNO-0500/ SNO-0110 - Testing .................................................................16
SNO-0500/ SNO-0110 - Troubleshooting .................................................16-18
Warranty Information ...............................................................................19
HBX SNO-0500 HVAC Control
Version 1.04
© HBX Control Systems Inc. 2012 Page 3
tl
HBX SNO-0500 SNOWMELT CONTROLLER
INTRODUCTION
This manual will help with the installation, parameter setting,
troubleshooting and general maintenance requirements for the
controller. To guarantee the safe and reliable operation of this control,
and all warnings or caution directives prior to connecting to AC power.
and HVAC controls should attempt the installation of this equipment.
Incorrect wiring and installation will affect the warranty provided with
this unit. Wiring must be completed in accordance with the codes and
practices applicable to the jurisdiction for the actual installation.
The HBX SNO-0500 is a standalone snow melt control. Please consult
and install the heating appliance in accordance with manufacture’s
recommendations.
SAFETY SYMBOLS & WARNINGS
Extreme Hazard
This action poses a serious threat that could
result in personal injury or death, as well as
permanent damage to the equipment.
Proceed with caution.
Moderate Hazard
This action may cause personal injury or have
adverse effects on the installation process if
handled incorrectly.
The presence of low voltage(24VAC) or high
voltage(120VAC) could result in personal injury
or permanent damage to components or
equipment.
Point of Interest
brings your attention to an action that may
have adverse effects on the installation
process.
drawing at the back of the manual.
training in electrical and HVAC controls should
attempt the installation of this equipment.
practices applicable to the jurisdiction for the
actual installation.
The HBX SNO-0500 is a microprocessor based
controller and as such is not to be regarded as a
safety (limit) control. Please consult and install
the heating or cooling appliance in accordance
RECEIPT & INSPECTION
After receiving, inspect the unit for any possible
physical damage that may have occurred during
transportation.
After unpacking the unit make sure the box contains:
1 x Remote Outdoor sensor
1 x Universal sensors
1 x Terminal Screwdriver (2.5mm)
1 x Cable ties
HBX SNO-0500 HVAC Control
Version 1.04
Page 4
0
10
20
30
40
50
60
70
80
90
3:20:00 AM 4:30:00 AM 5:45:00 AM
HBX SNO-0500 HVAC CONTROLLER
DESCRIPTION
The SN0-0500 is a stand alone snowmelt control, and utilizes a unique sensor technology unmatched by any
other snowmelt control system on the market today. This control utilizes sensor technology to detect falling
snow. The snowmelt sensor uses a heater to melt the snow that lands on the sensor. Base on this the control
measures the percentage of snow fall rate between 0% and 100%.
The SN0-0500 consists of numerous exceptional features including settings for your snow fall intensity as well
applications and snow melt provisions over and above conventional slab sensing. With the ability to control
stand alone control is suitable for single scale projects, or multizone projects that require individual optical
sensors for each melt zone.
Some features of the HBX SNO-0500 are:
- Max. snow fall level settings
- Continuous snow fall settings
Snow Fall Rate
HBX SNO-0500 HVAC Control
Version 1.04
© HBX Control Systems Inc. 2012 Page 5
TECHNICAL DATA & DIMENSIONS
Built in 2 Amp fast acting fuse
2 x Thermistor Input
(10K Ohm)
1 x Miscellaneous Input Signal
2 x Relay Outputs
Dry Contacts
(240VAC 10Amps)
1 x 2 Amp Dry Contact
1 x Snowmelt Sensor Input
0.408Kg
100mm W x 168mm H x 70mm D
Meets CSA C22.2 No. 24
Meets UL Standard 873
ETL Control No. 3068143
50°F to 104°F (10ºC to 40ºC)
SNO-0500
SNOW
SENSOR
7 8 9 10
DEMAND
THERM(S)
1 2 3 4
BOILER
5 6
POWER
14 15 16
1/2
RELAY
11 12 13
Boiler
Enable/
TT
Outdoor
Sensor
120
VAC
System &
Injection
Pump
Floating
Valve
System
Sensor
Demand
Input
F
loat
i
n
g
SNO Sensor
70mm 66mm17
Side View Front View Rear View Top View
168mm
100mm
63.2mm
86mm
Bottom View
DIMENSIONS
HBX SNO-0500 HVAC Control
Version 1.04
Page 6
Apply snowmelt demand from a dry contact. For
force melt demand use a momentary switch.
Boiler enable contact.
Sensor Inputs
System sensor, installed on low temperature
system.
Outdoor sensor.
Snowmelt Optical Sensor: connection order:
Green – contact 7, Red – contact 8. White – contact
9, Black – contact 10, Shield – contact 10
Injection pump, can also be used with relay 2 to
System pump, can also be used with relay 1 to control
(Relays 1 & 2 are dry contacts and rated for a
maximum of 10 Amps.)
When the desired sensor location is more than
100 feet from the end of the sensor you need to
extend the cable using 18AWG shielded cable.
Jumper
This jumper is used to add or remove arc suppression from the relay 2
contacts.
If you are using the SNO-0500 in PMIp injection mode the jumper
on
SNO-0500 Rear View
Jumper
INSTALLATION
The SNO-0500 is designed to be wall mounted, DIN rail mounted or
installed in a separate electrical enclosure. The unit should be mounted
inside and protected from falling water and high humidity conditions.
With all the covers in place it is designed to protect any individual from
accidental electrical shock.
WIRING AND INSTALLATION
WIRING
All signal wiring must be with a
minimum of 18AWG wire at a
maximum of 500ft.
HBX SNO-0500 HVAC Control
Version 1.04
© HBX Control Systems Inc. 2012 Page 7
MULTICOLOUR BACKLIT DISPLAY
The Multicolour Backlit Display is one of the key features of the HBX Controls stand-alone SNO-0500 Control.
Depending on which mode of operation is selected the screen colour will change to indicate information
about the status of the system.
Screen Colours
Light Blue - No Demand
Red - Melt Mode
Dark Blue - Idle Mode
1 2 3 4
°F
110.0
Status
Set
:
1:
2:
3:
4:
M
Set
DIAL OPERATION & SET/STATUS MODE
There are 2 modes for the control, programming and status screens. The programming
by the SET icon on in the top/middle left corner. The status screen is indicated by the STATUS icon in the top/
middle left corner.
Pressing the dial in for more than one second will allow the user to access the programming section of the
control.
Page 8
PROGRAMMING SCROLL MODE
To enter this mode the dial must be pressed in for more than one second. When the SET indicator comes on
release the button, you will now be in Programming Scroll Mode.
In this mode turning the dial to the left or right will scroll through the programming options on the control. Each
setting will be indicated by the icons around the screen as well as the temperature/number of that setting.
If you allow the control to idle in Programming Scroll Mode for thirty seconds the control will automatically return
to STATUS mode.
PROGRAMMING CHANGE MODE
To change a setting you must press the dial in momentarily and an arrow will appear in the top left corner of
the screen. This will indicate the control is in the Programming Change Mode. While in the change mode the
user will be able to change the setting of that selection by turning the dial to the left or right. Once you have
will indicate that the user is no longer in Programming Change Mode.
CC
C
II
nn
pp
ut: 120VAC 60Hz 10ut: 120VAC 60Hz 10
AA
OOutput: 4-20mA/1-10Vutput: 4-20mA/1-10V
1 10V
Set
CC
C
IInn
pp
ut: 120VAC 60Hz 10ut: 120VAC 60Hz 10
AA
OOutput: 4-20mA/1-10Vutput: 4-20mA/1-10V
1 10V
Set
STATUS SCREENS
Target Temperature
Temperature
°F
System
Temp
96.0
Status
°F
Setpoint
System
Temp
90.0
Status
Outdoor Air Temperature
Slab Setpoint
3
°F
Out Temp
90.0
Status
%
15.0
Status
Slab
°F
Temp
18.0
Status
Slab Temperature
Slab
°F
Setpoint
18.0
Status
Page 9
Instant Intensity
If the snow melt sensor sees a greater snowfall rate than this set percentage, the
control will come out of idle mode and go into melt mode.
(1% to 100%) Default: 25%
%
25.0
Set
SNOWMELT CONTROL PROGRAMMING
Constant Intensity
If the snowfall rate is greater than this set percentage, for longer than the constant
time set below, the control will come out of idle mode and go into melt mode.
(1% to 100%) Default: 10%
%
10.0
Set
Demand Input Type
DEM 0: Demand forces melt mode (always in idle mode).
DEM 1: Demand starts control in Idle mode.
DEM 2: Same as DEM 0, but boiler output only closes when control goes into melt
mode.
Default: DEM 0
Constant Time
Set this time in conjunction with constant intensity.
(1h to 10hrs) Default: 3 Hours
Time
3.0
Set
Set
Set this to the minimum slab temperature when there is no snow present.
(-40°F to 70°F) Default: 25°F
Slab
Min
Temp
25.0
Set
Demand input is on pin 1
and 3. This is a dry contact.
Page 10
System Delta T
system target. The target is calculated by using system supply and system return
temperatures:
(2°F to 80°F) Default: 25°F
This setting allows for the system to stay on even after no snow is present. This will
melt any residual snow that has accumulated and not melted.
(1h to 20hrs) Default: 4 hours
This time is also used when a force melt demand is given. Once a force melt
demand is given the control will stay in melt mode for this amount of time.
Slab
Time
Max
4.0
Set
Diff
°F
System
25.0
Set
Min System Temperature
Min System Temp is the lowest water temp in your system loop.
(40°F to 200°F) Default: 75°F
Min
°F
System
Temp
75.0
Set
This setting is used to set the snow zone slab temperature when snow is present.
Going from idle to melt temperature is determined by the snow sensor. If the
amount of snow is more than the intensity settings then the control will go into melt
mode.
(1°F to 70°F) Default: 50°F
Slab
Max
°F
Temp
50.0
Set
This is the temperature at which you decide that the control will go into WWSD. Set
this to the temperature at which the slab is able to melt itself.
(2°F to 100°F) Default: 40°F
Max
°F
Out Temp
40.0
Set
If the outdoor temperature is below this setting the control goes into C.W.S.D.
This prevents the control from running in extremely cold weather when the snow is
not likely to melt properly.
(-50°F to 20°F) Default: -30°F
Min
Out Temp
30.0
Set
Page 11
Slab Sensor Location
Set this to INT when the Snow/ Ice Optical Sensor is mounted in-slab, or set to REM
when mounted remotely.
Default: INT
Slab
Sensor
int
Set
Mixing Type
This setting is used to select your mixing type.
IN: PMIp injection pump
FLO: Floating action valve (power open/ power close)
Default: IN
Celsius & Fahrenheit
Use this setting to change the display format from °C to °F
Default: °F
to go into melt mode by the instant setting
System Maximum
Set this to the maximum temperature you would like in the slab. This is for the low
temperature system loop.
(40°F to 200°F) Default: 135°F
Max
°F
System
Temp
135.0
Set
On
Off System
Setin
°F
Set.
HBX SNO-0500 HVAC Control
Version 1.04
Page 12
DRAWINGS
This system uses a PMIp injection pump to mix high
temperature water into the slab.
This system uses a PMIp injection pump to mix high temperature
water into the slab.
HBX SNO-0500 HVAC Control
Version 1.04
© HBX Control Systems Inc. 2012 Page 13
DRAWINGS
high temperature water into the slab.
(electrical).
mix high temperature water into the slab.
HBX SNO-0500 HVAC Control
Version 1.04
Page 14
M 0
M
M M
1 3
M
DEM 1
SnowMelt Time
Check for snow
DEM 0 Idle Mode
Demand on pin
1 and 3
No
Yes
Melt Mode
No
Yes
DEM
SnowMelt Time
Melt Mode
Check for Snow
or Demand on
pin 1 and 3
Idle Mode
No Yes
oiler Contact on
Demand Input DEM 0: Demand forces
melt mode (always in Idle mode)
Demand Input DEM 1: Demand starts
control in Idle mode
Demand Input DEM 2: Demand forces
melt mode (always Idle Mode) but
boiler output only closes when control
goes into melt mode
HBX SNO-0500 HVAC Control
Version 1.04
© HBX Control Systems Inc. 2012 Page 15
This function allows the installer to test the 4 Relays of the SNO-0500 and the Snowmelt Sensor-0110.
Relay Testing
This allows you to manually test/run each relay for up 30 seconds. There are 4 relays on the SNO-0500:
Relay 1: Boiler demand
Relay 2: Injection Pump
Relay 3: System Pump
Relay 4: Sensor Heat ON
Plug in the power into the SNO-0500 while holding the button in. Once the control has power, the actual
version of the control is going to appear on the screen.
Hold the dial in until relay 1 to appears in the top left hand corner then release the dial button. The sequence
of relay testing its going to start from this point until the last Relay 4.
(Light Blue Screen)
1
i ht l e Screen
2
i ht l e Screen
3
i ht l e Screen
4
Once the Relays have been tested it takes approximately 30 seconds the control to start up it’s routine and be
ready to start the snowmelt sensor testing.
FUNCTION TESTING
The objective with this testing is allows the Heater
(Relay 4 = ON) inside the snowmelt sensor to start to
heat the top of the SNO-0110 and activate the Melt
mode. The screen must change from Idle mode (Dark
Blue) to Melt Mode (Red). To achieve this testing the
Outdoor Air Temperature has been set to 10ºF and
the Low Temperature System Target has been set to
75ºF.
Rub water or snow on top of the sensor with your
should change from Idle mode (Dark Blue Screen) to
Melt Mode (Red Screen) and you should get some
Snow % showing on the Screen.
Dark l e Screen
%
4
0.0
Status
%
1 2 3 4
65
Status
HBX SNO-0500 HVAC Control
Version 1.04
Page 16
TESTING AND TROUBLESHOOTING PROCEDURE
Temperature
Resistance
Temperature
Resistance
Temperature
Resistance
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
SN0-0500 / 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.
SN0-0500 / SNO-0110 - Troubleshooting
Outdoor Sensor
Problem: The outdoor temperature displayed on the control its different from the outside temperature.
Status Screen: Outdoor Air Temperature: -37.2 ºF
Explanation: The control is no longer able to read the outdoor sensor due an open circuit. In this case the
control assumes an outdoor temperature of -37.2 ºF and will only continue operation if the CWSD is below -37.2
ºF.
Solution: Verify the outdoor sensor connection as described in the Installation Manual of the SNO-0111/SNO-
seasons.
HBX SNO-0500 HVAC Control
Version 1.04
© HBX Control Systems Inc. 2012 Page 17
System Sensor
Problem: The system temperature displayed on the control is different from the system temperature.
Status Screen: Low Temperature System Temperature: 0 ºF / System Sensor Error
Explanation: The control is no longer able to read the system sensor due an open circuit. In this case the
control assumes a system temperature of 225ºF and will shut off the injection pump.
Solution: Verify the system sensor connection as described in the Installation Manual of the SNO-0111/SNO-
0110.
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 185ºF 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.
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:
concrete and not reading the slab temperature properly due a improper wicking of the heater to the
concrete.
driveway resulting in overheating the sensor.
temperature of the sensor more than the 40 ºF degrees designed.
HBX SNO-0500 HVAC Control
Version 1.04
Page 18
Solution
the Melt Temperature according to the deviation
between the temperature showed by the SNO
-0500 and the slab.
remote sensor. To do this, you should set it in the
programming 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.
HBX SNO-0500 HVAC Control
Version 1.04
© HBX Control Systems Inc. 2012 Page 19
Limited Warranty
HBX Controls warrants each of its products to be free from defects in workmanship and materials under normal use and
service for a period of 24 months from date of manufacture or 12 months from date of purchase from an HBX Authorized
Dealer, if within the above documented period after date of manufacture.
If the product proves to be defective within the applicable warranty period, HBX on its sole discretion will repair or replace said
product. Replacement product need not be of identical design or model. Any repair or replacement product pursuant to
this warranty shall be warranted for not less than 90 days from date of such repair, irrespective of any earlier expiration of
original warranty period. When HBX provides replacement, the defective product becomes the property of HBX Controls.
a dated invoice/receipt must be provided to expedite the issuance of a Factory RMA.
After an RMA number has been issued, the defective product must be packaged securely in the original or other suitable
shipping package to ensure that it will not be damaged in transit. The RMA number must be visible on the outside of the
package and a copy included inside the package. The package must be mailed or otherwise shipped back to HBX with all
costs of mailing/shipping/insurance prepaid by the warranty claimant.
Any package/s returned to HBX without an approved and visible RMA number will be rejected and shipped back to purchaser
at purchaser’s expense. HBX reserves the right, if deemed necessary, to charge a reasonable levy for costs incurred, additional
to mailing or shipping costs.
Limitation of Warranties
If the HBX product does not operate as warranted above the purchasers sole remedy shall be, at HBX’s option, repair or
replacement. The foregoing warranties and remedies are exclusive and in lieu of all other warranties, expressed or implied,
purpose/application. HBX neither assumes nor authorizes any other person to assume for it any other liability in connection
with the sale, installation maintenance or use of HBX Controls products.
HBX shall not be liable under this warranty; if its testing and examination discloses that the alleged defect in the product
does not exist or was caused by the purchasers or third persons misuse, neglect, improper installation or testing, unauthorized
Limitation of Liability
consequential or indirect damages arising out of the installation, maintenance, commissioning, performance, failure or
interruption of an HBX product, however caused and on any theory of liability. This limitation will apply even if HBX has been
advised of the possibility of such damage.
from state to state in the United States, from Province to Province in Canada and from Country to Country elsewhere in the
world.
consistent with such local law. Under such local law, certain disclaimers and limitations of this statement may not apply to the
purchaser. For example, some states in the United States, as well as some governments outside the United States (including
Canadian Provinces), may:
Preclude the disclaimers and limitations in this statement from limiting the statutory rights of a consumer (e.g. United Kingdom);
Otherwise restrict the ability of a manufacturer to enforce such disclaimers or limitations; or
Grant the purchaser additional warranty rights which the manufacturer cannot disclaim, or not allow limitations on the
duration of implied warranties.
HBX Control Systems Inc. 2012
Phone: +1 (403) 720-0029 Fax: +1 (403) 720-0054
Email: info@hbxcontrols.com Web: www.hbxcontrols.com
HBX Control Systems Inc.
4516 - 112th Avenue SE
Calgary, AB Canada T2C 2K2
v1.2
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