WarmlyYours SCV-DUAL Installation Manual

WarmlyYours SCV-DUAL Installation Manual
Dear Customer,
Thank you for purchasing your radiant heating control from WarmlyYours.
WarmlyYours is dedicated to making comfort easy and we continually strive to
provide our customers with the best controls in the industry.
WarmlyYours sells this product under part number SCV-DUAL. The control’s
manufacturer identifies this same part with the model number of LCD-8 in all
the documentation provided with the control.
If you have any technical questions related to this control or the installation of
any of our radiant heating systems, please call our 24/7 installation team at
(800) 875-5285 or visit our website at www.WarmlyYours.com.
Technical Team
Installation Support • No Nonsense™ Warranty •(800) 875-5285 • www.WarmlyYours.com
We Manage Heat ®
Automatic Snow/Ice Melting System Controller
Installation and Operation Manual
Environmental Technology, Inc.
1850 N Sheridan Street
South Bend, Indiana 46628
(574) 233-1002 or (800) 234-4239
FAX (574) 233-2152 or (888) 234-4238
24782 Rev. A
(800) 234-4239
Environmental Technology, Inc.
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
2 of 14
Environmental Technology, Inc.
(800) 234-4239
24782 Rev. A
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
Make all electrical connections in compliance with the National Electrical Code
(NFPA 70) and local electrical code. If you have questions concerning the installation
or application, contact Customer Service.
Abnormal Odor or Smoke
In the event of smoke or a burning or abnormal odor, immediately interrupt
power to the unit by unplugging the unit or by turning off the circuit breaker protecting the unit.
Electrical Shock / Fire Hazard
Even when the snow melting elements are disconnected, as long as the circuit
breaker is on and power is running to the unit, voltage is still being applied to the
system’s yellow leads. Therefore, never touch the ends of the yellow leads or let the
two leads touch each other. Do not let the two yellow leads contact any component
inside the unit.
Any installation involving electric heater wiring must be grounded to earth to
protect against shock and fire hazard. Suitable ground fault detection and interrupting
systems must be in use at all times to reduce shock and fire hazard and to protect
Electric wiring to heating elements must be installed in accordance with National
Electrical Code (NEC) requirements and all other local and applicable electrical codes
and any third party standards. Follow the installation instructions contained herein and
those provided by the heater manufacturer.
Use a GFEP (Ground Fault Equipment Protection) circuit breaker on each branch
circuit connected to the ice melting system. Clearly label each circuit breaker with its
function. This is vitally important when there is more than a single point of disconnect.
Size the circuit breaker in accordance with the size of the expected load. The
maximum current load for the LCD-8 is 16 Amp resistive. This product is intended for
use in residential or light commercial applications.
Make certain that the heater shield is properly grounded. Failure to do so may
result in damage to the equipment or fire.
Following installation and prior to beginning system operation, refer to and perform
the Post-Installation Tests (page12) described in this manual.
Additional Information
More information is made available regularly through our website,
www.networketi.com. Please visit us online for Data Sheets, Manuals, White Papers,
technical articles, and more. The most current and up to date version of this and
every other manual for our products can be found in Acrobat (PDF) format to view
online or to print. This is to assist you in installing and using our products to the
best effect possible. If you have any comments about this or any other product from
Environmental Technology, Inc., please contact us.
Contacting Environmental Technology, Inc.
For assistance, contact Customer Service. Office hours are from 8:00 AM until
5:00 PM ET.
(800) 234-4239 (USA and Canada) or (574) 233-1002 (elsewhere)
(888) 234-4238 (USA and Canada) or (574) 233-2152 (elsewhere)
[email protected]
Environmental Technology, Inc.
1850 North Sheridan Street
South Bend, IN 46628
24782 Rev. A
(800) 234-4239
Environmental Technology, Inc.
3 of 14
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
LCD-8 Overview
Figure 1. LCD-8
The Snow Switch® Model LCD–8 (Figure 1) is a configurable aerial snow melting system controller which makes automatic snow melting a cost-effective alternative in even the smallest applications. Heaters operate at temperatures below the
LCD-8’s configurable set point, 38°F (3.3°C) default, only when required. The adjustable hold-on period, 3 hours default, continues heater operation after snow stops to
ensure complete melting. The LCD–8 controller includes an internal magnetic reed
switch used for manual heater cycling and configuring the controller’s operational
temperature set point and hold-on time.
The LCD–8 controller is available as a model which operates from either an
automatic selecting 100VAC – 240VAC or as a model which operates from 24VAC.
These two voltage options combine with the configurable hold-on time and temperature set point to meet the need of a wide number of applications using just two
part numbers.
It controls heater loads up to 16 amps resistive or 3 amps inductive. The
operating temperature range extends from –40°F to 140°F (–40°C to 60°C). The
redesigned, patent pending, rugged polycarbonate enclosure provides excellent
protection at temperature extremes, while allowing snow to shed to prevent iglooing
over the moisture sensor.
The internal magnetic reed switch allows for both configuration and manual
heater operation without the need for external switches—which are susceptible to
damage—or the need to open the enclosure.
Verifying system functionality after installation or when troubleshooting used
to require spray circuit cooler or ice for controller activation. The Sno-Test™ feature
eliminates this need by performing a self-test after power application and operating
heaters in a unique pattern for a few seconds. Reading the test results takes only an
AC voltmeter or clamp-on ammeter.
A configurable snow sensor with two light-emitting diode (LED) indicator
lamps (Figure 2), the LCD-8 features a hold-on timer which allows its system to
operate to a drier surface after melting snow.
• The hold-on timer can be configured for off, 1 hour, 3 hours or 5 hours.
The operating temperature can be configured for none (precipitation sensor),
36°F, 38°F or 40°F.
• The low-temperature lockout (17°F), which disengages unit operation, can be
enabled or not.
• Default configuration: 38°F operating temperature; 3 hour hold-on; no lockout.
• The LCD-8 uses an internal magnetic switch. The user swipes a magnet
externally across this switch to start a hold-on cycle or to terminate a running
hold-on cycle.
This switch may also be used to reconfigure the unit, or to view the current
• The green LED, ordinarily on steady, blinks to indicate a concern with the unit.
This LED is also used in the LCD-8’s configuration process.
• The yellow LED indicator is lit whenever the output relay is powered (“on”).
• There is an initialization period where the heaters are tested.
green LED
Ambient Air
yellow LED
Figure 2. LCD-8 LEDs
4 of 14
Environmental Technology, Inc.
(800) 234-4239
24782 Rev. A
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
Immediately upon receipt, inspect the container and packing material for any
noticeable damage. Unpack the unit, taking care not to damage the packing materials. Confirm all components noted in “Packing List” above are included. Save the
shipping container and related materials until normal operation has been established. If the unit must be returned, take care to ensure that it is repackaged as it
was received.
As soon as the unit arrives at your facility, inspect it for mechanical damage.
if any of the following problems is found, contact WarmlyYours Customer
Service immediately.
• contents incomplete or incorrect;
• internal or external mechanical damage; or
• defective operation
WarmlyYours can be reached 24/7 @ (800) 875-5285.
24782 Rev. A
(800) 234-4239
Environmental Technology, Inc.
5 of 14
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
With user-supplied hardware, mount the LCD-8 securely in an upright position (sensor grid at top; see Figure 3) in a clear and open area typical of the area to
be melted, either above the roof line or removed from the building and exposed to,
rather than protected from, falling snow.
Avoid overhead trees, shrubs, wires, eaves, etc., and falling or blowing debris.
Avoid vehicle and foot traffic. Do not create a safety hazard.
Avoid exposure to artificial heat sources and excessive shock and vibration.
The LCD-8 also should be positioned at a height above ground that reduces,
eliminates or discourages damage caused by animals or vandals.
Sensor grid
Be certain sensor grid is in a clear
and open area identical to that
requiring melting and exposed
to falling snow.
Ø 4.60”
Ø 117mm
Ambient air temperature sensor
Cool this area per instructions when testing
Designed to be mounted using PVC conduit
using either 3/4" inserted
into the flange (0.82"/21mm ID)
or, with a coupler, 1" mounted
around the flange (1.32"/34mm OD).
Consider PVC adaptor if using metal conduit.
Weatherproof conduit body
or junction box supplied by customer.
Make all threaded joints weathertight.
Insulate splices with wire nuts.
Mount rigidly in an upright position,
as shown, at a height above ground
as necessary to discourage
animal damage and vandalsim.
Figure 3. LCD-8 installation
6 of 14
Environmental Technology, Inc.
(800) 234-4239
24782 Rev. A
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
Install in accordance with the requirements of all applicable electrical and building codes and regulations. Ensure
that all conduit and cable terminations are watertight.
NEC Article 426.28 requires Equipment Ground Fault
Protection (GFEP) for Ice and Snow Melting Equipment.
This functionality is not provided as part of this controller
and shall be provided as part of the overall system.
Wiring: Direct Heater
100–240 VAC
50/60 Hz
Resistive load, up to 16 amps
(Self-limiting Cable, ConstantWattage Cable, MI Cable, etc.)
Wiring: External Contactor
100–240 VAC
50/60 Hz
Inducitve load, up to 3 amps
(Contactor, Pump Motor,
Motorized Valve, etc.)
Wiring: Dry Contact
100–240 VAC
50/60 Hz
Dry Contacts
24782 Rev. A
(800) 234-4239
Environmental Technology, Inc.
7 of 14
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
Initialization Sequence
Upon power up, the LCD-8 performs an initialization sequence, allowing a user
or technician to verify its operation.
First, the external relay energizes for ten seconds. Next, the relay powers off
and the cup heaters energize for ten seconds. Finally, both are off for another ten
seconds. During this time, the green LED blinks slowly—one (1) second on, one (1)
second off. Normal operation follows.
When energized, the controller’s green LED is on continuously. During an
alarm condition, the green LED blinks quickly, alternating between on and off twice a
second. Exceptions are when the green LED conveys information during the configuration process or when the unit is in an automated testing device.
When the system detects moisture and the ambient temperature is below the
operating temperature, if there is one, this defines a “snow” event. For a precipitation sensor (operating temperature off), moisture is detected at any temperature:
this could be snow or rain.
Four States of LCD-8 Controlled System
The system can be in one of four states, three with lockout disabled or one in
lockout enabled:
• Idle: the LCD-8 monitors during conditions lacking moisture and/or cold
air temperature
• Call for Heat: the LCD-8’s sensors recognize snow or ice as moisture
• Holding: the LCD-8 continues system operation for hold-on duration unless snow begins again; when hold-on time is over or parameter is set to
zero (0), systems returns to Idle state
• Lockout enabled: low-temperature lockout, where temperature is too
cold for system to operate effectively and energy is conserved
The heater is on during a snow event or within its holding state.
Initiating Hold-On State
The user can also swipe the magnet to start a hold-on cycle or to terminate
a hold-on cycle. If a manual cycle is started, it operates for the normal hold-on
duration (note: if the hold-on time is set to 0, operation lasts one hour). However,
if the ambient temperature is above 50°F when the cycle starts, the cycle duration
is ten (10 ) minutes. If the temperature rises above 50°F during the cycle, operation
truncates to 10 minutes. This 10-minute constraint is only for manually-triggered
hold-on cycles; a cycle resulting from snow proceeds for the full duration. Note: this
does not apply to a precipitation sensor.
8 of 14
Environmental Technology, Inc.
(800) 234-4239
24782 Rev. A
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
Special Case: Hold-On Time is 0
For the special case that only occurs with a manual swipe when the hold-on
time is set to zero (0), the heater operates for at least one hour, even if there is a
snow condition. In terms of a strict state description in this one case, a snow condition does not cause the system to enter the snow state, but rather to stay in the
hold-on state. If the snow remains after the one hour, the heater remains energized.
In the “enabled” Lockout state, the heater is not on. When snow is detected,
the system enters the Snow state if the ambient air temperature is above 17°F, but
it enters the Lockout state instead if the temperature is below 17°F. Additionally, this
Lockout state is entered if the temperature falls below 17°F during an automatic
hold-on cycle. If the temperature rises above 17°F in the Lockout state but with no
moisture detected (not snowing), the hold-on timer is restarted. In the Lockout state,
the heater is not on.
If in the Idle state and the temperature is below 17°F when a magnet swipes
the magnetic switch, the system initiates its manual cycle as usual. If the temperature falls below 17°F during the cycle, it is ignored. If the unit is in the Lockout state
and the user swipes the magnetic switch, the temperature reading is ignored. This
will be maintained until the end of the snow event (that is, until a return to the Idle
The override ends when the heaters turn off. However, if a manual cycle is
initiated while when the environment is frigid, and then snow starts, the heaters
remain energized until the snow stops and for the hold-on time thereafter.
Note: Avoid selecting both low-temperature lockout and a hold-on time of zero
(0) hours, as the heaters may not energize.
When the LCD-8 operates normally, its green LED is lit continuously. Under an
alarm condition, this LED will flash rapidly—on and off twice a second. The alarm
may or may not inhibit operation, depending on circumstances.
Three possible conditions exist which initiates an alarm:
• Bad cup thermistor. If the cup thermistor is bad, the unit will not do
automatic snow melting. The rationale is that we can’t turn on the cup
heater without risking damage to the unit; and if snow or freezing rain
falls with the cup cold, it may stay there for weeks, and the unit would
never shut off. The manual hold-on cycle will work.
• Bad ambient thermistor. If the ambient thermistor is bad, the unit will
operate normally if it is configured as a precipitation sensor; if it is configured as a snow sensor, it will not do automatic snow melting. The manual
hold-on cycle will work.
• Corrupted configuration. If the configuration is corrupted, the unit will
operate under its default configuration.
The bad thermistor alarms will clear if the thermistor repairs itself. The corrupted configuration alarm will clear if the unit is reconfigured: in that case the user
is advised to cycle power, confirming reconfiguration.
24782 Rev. A
(800) 234-4239
Environmental Technology, Inc.
9 of 14
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
Prior to learning how to change the configuration of the LCD–8, it is first necessary to understand how the device communicates with the user; see Table 1. As
there is no display on the unit, the only means of communicating with the device is
to carefully observe the pulse pattern of the green LED.
Hold-On Time
(in hours)
0 Hours
(1 Pulse)
1 Hour
(2 Pulses)
3 Hours
(3 Pulses)
5 Hours
(4 Pulses)
Set Point (in °F)
(1 Pulse)
36°F (2.22°C)
(2 Pulses)
38°F (3.33°C)
(3 Pulses)
40°F (4.44°C)
(4 Pulses)
Low Temperature
(1 Pulse)
(2 Pulses)
*When the Temperature Set-Point feature is configured to be in the “OFF” setting, the LCD–8 senses
moisture only and activates the heaters regardless of temperature.
LCD-8 Magnetic Reed Switch
The LCD-8 uses an internal magnetic reed switch (Figure 4), where the user
swipes a magnet (Figure 5) externally across this switch (Figure 6) to start a holdon cycle or to terminate a running hold-on cycle. The magnetic switch determines
whether the user’s action “swipes” or “holds” the magnet during LCD-8 configuration.
(inside unit)
Figure 4. Magnetic Reed Switch
Figure 5. Magnet (external)
10 of 14
Figure 6. Positioning (left) and swiping (right)
external Magnet over internal Magnetic Switch
Environmental Technology, Inc.
(800) 234-4239
24782 Rev. A
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
LCD-8 Configuration
The user is able to configure three operating parameters on the Snow Switch
Model LCD–8.
These are:
• the hold-on time in hours;
• the temperature set point in degrees Fahrenheit; and
• low temperature lock-out operation.
The definitions of each of these parameters, as well as how to determine their
current setting and how to change those settings, will be explained in this section of
the manual.
Hold-on time refers to the number of hours that the heaters will continue to
operate once the unit no longer detects precipitation. Hold-on time ensures that
not only is all the snow melted from the protected surface, but also that the system
continues to dry and evaporate the surface without refreezing. The factory default
hold-on time setting is 3 hours.
The temperature set-point refers to the temperature at which the LCD-8
activates the heaters given the presence of moisture. When set to its default, “Off,”
the controller activates the heaters based only on the presence of moisture at any
temperature. The factory default temperature set point is 38°F (3.33°C).
The low temperature lock-out function disables unit operation in temperatures less than 17°F (–8.33°C) in those climates or during those seasons where it
is simply too cold to make operation practical. The factory default low temperature
lock-out setting is Off, meaning that the unit will try to activate the heaters regardless of ambient temperature.
Setting the configuration
There are three fields available for configuration. Each has several numerical
values possible, as follows:
3 hour hold-on
2 second pause
38°F / 3.3°C
2 second pause
Low temperature
lockout disabled
4 second pause; to top
Figure 7. LED response, default configuration
24782 Rev. A
(800) 234-4239
Field 1: Hold-On Time
1: off
2: 1 hour
3: 3 hours*
4: 5 hours
Field 2: Operating Temperature
1: none (precipitation sensor)
2: 36°F / 2.2°C
3: 38°F / 3.3°C*
4: 40°F / 4.4°C
Field 3: Low Temperature Lockout
1: disabled*
2: enabled
*default value
Environmental Technology, Inc.
11 of 14
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
To Enter the Configuration Process
• Hold the magnet to the switch for 3 seconds
• The green LED will go off
• Remove the magnet
• Process begins
The unit will flash the values of the three Field parameters in order, repeatedly.
The pattern begins with
• Field 1’s green LED pulses
• 2 seconds between Field 1 and Field 2
• Field 2’s green LED pulses
• 2 seconds between Field 2 and Field 3
• Field 3’s LED pulses
• 4 seconds between Field 3 and returning to Field 1;
the four (4) second gap helps the user identify Field 1, the starting point of the
sequence, even after the sequences of pulses have repeated several times. The
LCD-8’s default configuration is represented in Figure 6, above.
After changing the parameters of any field, the LCD-8 returns to the display
To Display the Current Values
Hold the magnet over the magnetic switch for 3 seconds. The green LED turns
off then flashes a brief message (3 short pulses and a long pulse), and return to
normal mode. This can be done even if the parameters have not been changed.
To Change a Field’s Parameters
Hold the magnet to the switch during the pause after that field. The green
LED turns and remains on until the magnet is removed. That sets the value to 1.
Positioning the magnet on again, the LED turns on, then remove the magnet: that
sets that value to 2. Continue in this fashion.
There are two (2) seconds between swipes. After 2 seconds, the LCD-8 maintains the entered value and returns to display mode. If a value exceeds parameters,
the green LED flickers briefly and returns to displaying the previous values.
Note: if the magnet is held for 3 seconds during the process of setting a value
(having been released at least once), the green LED flickers briefly and restarts the
display process.
To Abandon the Process with No Changes
Allow the LCD-8 to sit for two (2) minutes. The unit will flash the green LED
quickly for 2 seconds and return to normal operation, displaying a steady green LED.
This can be done at any time in the process.
Note: changes to the operating temperature or the state of the lowtemperature lockout take effect immediately. Changing the hold-on time does
not affect any active hold-on cycles; new values will be used the next time a
hold-on cycle initiates.
12 of 14
Environmental Technology, Inc.
(800) 234-4239
24782 Rev. A
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
Post–Installation LCD-8 Test
Most problems result from installation errors. Before testing, verify that unit is properly installed.
1. Connect power to snow melting system. Wait 15 seconds; system should
not actuate.
2. Using ice water or other cooling agent, cool ambient air temperature sensor
to below 38°F (3.3ºC); system should not actuate. Apply moisture to moisture
sensing grid. System should actuate in less than 15 seconds.
3. Dry moisture sensing grid. Disconnect power to snow melting system. Wait 1
minute, then reconnect power. If system actuates, ensure sensing grid is dry
and ambient air temperature is above 38°F (3.3°C), then repeat this step.
Area of use
Nonhazardous locations
Type 873
Temperature Regulating Equipment
Cover attachment
Type 873
Temperature Regulating Equipment
109R 3R
Polycarbonate with machine screws
1 x 3/4" entry (bottom)
Pole mount
4.6" (W) x 6.1" (H) / 117mm (W) x 155mm (H)
Supply voltage
ETI PN 24619: 100VAC – 240VAC; 50/60 Hz
ETI PN 24781: 24VAC; 50/60 Hz
3 amp maximum inductive
16 amp maximum resistive
0, 1, 3 (default) or 5 hours; configured by magnetic reed switch
Off (moisture only), 36°F, 38°F (default), 40°F;
configured by magnetic reed switch
Heater Hold-On timer
Set point temperature
Status indicators
SUPPLY (green): Power on; will flash while in configuration mode
HEAT (yellow): Heating cycle in progress
Wire and Cable Ratings
Power cable
Heater cable
Size for heater load (16 amps maximum)
Size for maximum heater load
Operating temperature
Storage temperature
–40°F to 104°F (–40°C to 40°C)
−67°F to 167°F (−55°C to 75°C)
24782 Rev. A
(800) 234-4239
Environmental Technology, Inc.
13 of 14
Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC
Order Number
LCD–8 Aerial Snow Controller, 100–240 VAC (QTY 1)
LCD–8, 24VAC
Red Wire Nuts (QTY 4)
LCD–8 Manual (QTY 1)
ETI’s two year limited warranty covering defects in workmanship and materials applies. Contact Customer Service for complete
warranty information.
Environmental Technology, Inc., makes no representations or warranties, either expressed or implied, with respect to
the contents of this publication or the products that it describes, and specifically disclaims any implied warranties of
merchantability or fitness for any particular purpose. Environmental Technology, Inc., reserves the right to revise this
publication, and to make changes and improvements to the products described in this publication, without the obligation of
Environmental Technology, Inc. to notify any person or organization of such revisions, changes or improvements.
The ETI logo, Snow Switch, We Manage Heat are registered trademarks of Environmental Technology, Inc. LCD-8 is a trademarks of Environmental Technology, Inc.
Copyright © 2013 Environmental Technology, Inc. All rights reserved.
14 of 14
Environmental Technology, Inc.
(800) 234-4239
24782 Rev. A
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF