WarmlyYours SCV-DUAL User 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
[phone] or visit our website at www.WarmlyYours.com.

WarmlyYours
Technical Team

Installation Support • No Nonsense™ Warranty •[phone] • www.WarmlyYours.com

®

MANUAL

We Manage Heat

®

Automatic Snow/Ice Melting System Controller

SNOW SWITCH

®

MODEL LCD–8 100–240 VAC

Installation and Operation Manual

Environmental Technology, Inc.

1850 N Sheridan Street
South Bend, Indiana 46628
[phone] or [phone]
FAX [phone] or [phone]
http://www.networketi.com/

24782 Rev. A 03/13 [phone] http://www.networketi.com Environmental Technology, Inc.

Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC

2 of 14 Environmental Technology, Inc.

24782 Rev. A 03/13[phone]http://www.networketi.com

Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC

Safety

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
equipment.

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.

Voice: [phone] (USA and Canada) or [phone] (elsewhere)

Fax: [phone] (USA and Canada) or [phone] (elsewhere)

E-mail: [e-mail]

Mail: Environmental Technology, Inc.

1850 North Sheridan Street
South Bend, IN 46628

24782 Rev. A 03/13 [phone] http://www.networketi.com 3 of 14Environmental Technology, Inc.

Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC

General

LCD-8 Overview

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.

Figure 1. LCD-8

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 congured 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 conguration: 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

configuration.

 • 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

yellow LED

Figure 2. LCD-8 LEDs

4 of 14 Environmental Technology, Inc.

Ambient Air
Temperature
Sensor

24782 Rev. A 03/13[phone]http://www.networketi.com

Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC

As soon as the unit arrives at your facility, inspect it for mechanical damage.
if
Service

WarmlyYours

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 @ [phone].

UNPACKING THE LCD-8

Immediately upon receipt, inspect the container and packing material for any

noticeable damage. Unpack the unit, taking care not to damage the packing materi-

als. Conrm 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.

any of the following problems is found, contact WarmlyYours Customer

immediately.

• contents incomplete or incorrect;

• internal or external mechanical damage; or

• defective operation
can be reached 24/7 @ [phone].

24782 Rev. A 03/13 [phone] http://www.networketi.com 5 of 14Environmental Technology, Inc.

Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC

Installation

With user-supplied hardware, mount the LCD-8 securely in an upright posi-

tion (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

Ø 4.60”

Ø 117mm

requiring melting and exposed
to falling snow.

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.

6.35”

161mm

0.50”

13mm

0.75”

29mm

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.

24782 Rev. A 03/13[phone]http://www.networketi.com

Wiring: Direct Heater

100–240 VAC

50/60 Hz

Resistive load, up to 16 amps
(Self-limiting Cable, Constant-

Wattage Cable, MI Cable, etc.)

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.

BLKL1

YEL

YEL

WHT

L2/N

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

BLKL1

YEL

YEL

K1

WHT

L2/N

BLKL1

WHT

L2/N

YEL

Dry Contacts

YEL

24782 Rev. A 03/13 [phone] http://www.networketi.com 7 of 14Environmental Technology, Inc.

Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC

Operation

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 denes 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 un-
less 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.

24782 Rev. A 03/13[phone]http://www.networketi.com

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
state).

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.

Alarms

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 congured as a precipitation sensor; if it is cong­ured as a snow sensor, it will not do automatic snow melting. The manual
hold-on cycle will work.

• Corrupted conguration. 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 03/13 [phone] http://www.networketi.com 9 of 14Environmental Technology, Inc.

Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC

STEADY PULSING

GREEN LED PULSE PATTERN

Prior to learning how to change the configuration of the LCD–8, it is first nec-

essary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)

Temperature

Set Point (in °F)

Low Temperature

Lock-Out

*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.

Table 1. LCD–8 CONFIGURATION OPTIONS AND GREEN LED PULSE PATTERN

0 Hours

(1 Pulse)

OFF*

(1 Pulse)

36°F (2.22°C)

OFF

(1 Pulse)

1 Hour

(2 Pulses)

(2 Pulses)

3 Hours

(3 Pulses)

38°F (3.33°C)

(3 Pulses)

(2 Pulses)

5 Hours

(4 Pulses)

40°F (4.44°C)

(4 Pulses)

ON

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 conguration.

Magnetic

Switch

(inside unit)

Figure 5. Magnet (external)

Figure 4. Magnetic Reed Switch
(internal)

Magnet

Figure 6. Positioning (left) and swiping (right)
external Magnet over internal Magnetic Switch

10 of 14 Environmental Technology, Inc.

24782 Rev. A 03/13[phone]http://www.networketi.com

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

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.

TEMPERATURE SET-POINT

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

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).

LOW TEMPERATURE LOCK-OUT

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:

Field 1: Hold-On Time

Values 1: off

2: 1 hour

3: 3 hours*

4: 5 hours

Field 2: Operating Temperature

Values 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

Values 1: disabled*

2: enabled

*default value

24782 Rev. A 03/13 [phone] http://www.networketi.com 11 of 14Environmental Technology, Inc.

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

mode.

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.

24782 Rev. A 03/13[phone]http://www.networketi.com

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.

SPECIFICATIONS

General

Area of use Nonhazardous locations
Approvals

Enclosure

Protection NEMA 3R
Cover attachment Polycarbonate with machine screws
Entries 1 x 3/4" entry (bottom)
Material Polycarbonate
Mounting Pole mount
Dimensions 4.6" (W) x 6.1" (H) / 117mm (W) x 155mm (H)

Type 873
Temperature Regulating Equipment

109R

Control

Supply voltage ETI PN 24619: 100VAC – 240VAC; 50/60 Hz

ETI PN 24781: 24VAC; 50/60 Hz

Load 3 amp maximum inductive

16 amp maximum resistive

Heater Hold-On timer 0, 1, 3 (default) or 5 hours; configured by magnetic reed switch
Set point temperature Off (moisture only), 36°F, 38°F (default), 40°F;

configured by magnetic reed switch

Interface

Status indicators SUPPLY (green): Power on; will flash while in configuration mode

HEAT (yellow): Heating cycle in progress

Wire and Cable Ratings

Power cable Size for heater load (16 amps maximum)
Heater cable Size for maximum heater load

Environmental

Operating temperature –40°F to 104°F (–40°C to 40°C)
Storage temperature −67°F to 167°F (−55°C to 75°C)

24782 Rev. A 03/13 [phone] http://www.networketi.com 13 of 14Environmental Technology, Inc.

Snow Switch® Model LCD–8 Aerial Snow Controller, 100 – 240 VAC

ORDERING INFORMATION

Order Number Description

24619 LCD–8 Aerial Snow Controller, 100–240 VAC (QTY 1)

24781 LCD–8, 24VAC

18703 Red Wire Nuts (QTY 4)
24782 LCD–8 Manual (QTY 1)

LIMITED WARRANTY

ETI’s two year limited warranty covering defects in workmanship and materials applies. Contact Customer Service for complete
warranty information.

DISCLAIMER

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.

24782 Rev. A 03/13[phone]http://www.networketi.com