ASD Controller...10m (10 min) Function: E (ON Delay) Function E (ON Delay) delays operation of a specified group of heaters for the timer's specified interval. Two events can initiate

Ambient Sensing for Roof & Gutter Deicing Systems Installation Manual

ASD Controller

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OVERVIEW

The nVent RAYCHEM ASD Controller is a UL Listed ambient sensing digital unit that allows on/off operation of nVent RAYCHEM heating cables by energizing up to four (model ASD-4C) or eight (model ASD-8C) branch circuits according to the temperature set points on the digital temperature controller. A set point for heater on/off operation as well as a set point for low temperature cutout of the circuits are provided. The Low Temp Cutout mode serves to save energy by keeping the heaters off when temperatures are so low that no snow and ice melting occurs. Both temperature set points are easily field adjustable to suit local conditions.

DESCRIPTION

The ASD Controller uses a NEMA 4X polyester outdoorenclosure with lockable hasps. Enclosure outside dimensionsfor each model are:ASD-4C: 11-1/8" h x 9-1/4" w x 5-1/4" dASD-8C: 15-1/4" h x 13-1/4" w x 9-3/8" d

OPERATION

The ASD Controller uses a remote ambient temperature sensor to measure the ambient temperature. When the sensed temperature falls below the Heater On set point, the temperature controller causes the branch circuits to be energized. Conversely, when the sensed temperature raises above the Heater On set point the branch circuits are de-energized. If the sensed temperature falls below the Low Temp Cutout set point, the branch circuits will be deenergized and remain so until the ambient temperature rises back above the Low Temp Cutout set point. A 3-position rocker switch allows the controller to operate in automatic or hand (manual) mode, or to be turned off completely (switch set to the center off position). On the eight-circuit model, an additional timer allows a power on delay (field-adjustable) of four of the eight branch circuits in order to reduce overall heater system peak current. The ambient temperature sensor is mounted outdoors in a shaded location representative of minimum ambient conditions, and away from any heat source, such as a utility room exhaust vent, so that the sensor gives an accurate reading of the actual ambient conditions. The sensor comes with a standard 15 ft lead, but its range can be extended up to hundreds of feet using ordinary stranded copper wire.

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Date TitleDrawn BySL

Dwg SizeScale

17-Mar-2011

None ADrawing Number

R50-019-A010Rev

2! " #$%$& ! $' ()*+#*, -

Typical System LayoutAS-Digital Controller

. /

North

AS-Digital Controller(switches up to four 30A

branch circuits)

Branch CircuitBreaker Panel

(GFCB 30mA Trip)(by others)

JunctionBox

(typical)

Ambient Sensor(outdoors, shaded,

North side of building)

Cable feedthrough bottomof downspout

Cable feedat soffit

Cable feedthrough bottomof downspout

Cable feedat soffit

Indoor Location(garage or similar)

0 1234(#31205 67%$&*' $8 96! (, - #), ::$) +; , #, < %=!

Thermal Building Solutions4800 Golden Foothill Parkway

El Dorado Hills, CA 95762Phone: 916-933-5666 / Fax: 916-933-5959

1 0>3?@- $3120A 67B, - #" (#" - 8 :, C, @+8" #$'


Dwg SizeScale

01-Sept-2015

None B

Wiring DiagramASD-4C Controller

1 to 4 Circuits

Drawing Number

R50-050-A022-4CRev

0

= Factory Wiring= Field Wiring, As Req’d*

(contactor general purpose AC1 rating = 30A)

Key:

*Consult NEC for proper wire gauge to use with CB size.

DateRev Description By



X2

A1A2X1

AUTO

OFF

HAND

13

57

24

68

C1

A1A2

13

57

24

68

C2

A1A2

Line208V or 240V

Supply

UL ListedGround Fault

Circuit Breakers(by others)

ToHeatingCable

Ground Braid(typical)

120V Supply(Protected

Circuit)

L

N

AmbientSensor

Bulb

ToHeaterCircuit

If using extension wiring forremote placement of sensor bulb,refer to drawing R50-052-A020

ASD-4C Controller

15 ft LongSensorLead

Field Wiring(by others, typ)

Heater On Indication Light

When rocker switchis set to HAND

position, heaters areenergized, regardlessof ambient conditions

120V or 277VSupply

Line

Neutral

LineToHeaterCircuit

Sample Wiring

TYPICAL SYSTEM LAYOUT

WIRING DIAGRAM ASD-4C CONTROLLER (1 TO 4 CIRCUITS)

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Dwg SizeScale

01-Sept-2015

None B

Drawing Number

R50-050-A022-8CRev

0

= Factory Wiring= Field Wiring, As Req’d*

(contactor general purpose AC1 rating = 30A)

Key:

*Consult NEC for proper wire gauge to use with CB size.

DateRev Description By



Wiring DiagramASD-8C Controller

1 to 8 Circuits

AUTO

OFF

HAND

13

57

24

68

C2

A1A2

X2

A1A2X1

13

57

24

68

C1

A1A2

A115

16

A2

18

B1

TRL04

13

57

24

68

C3

A1A2

13

57

24

68

C4

A1A2

ToHeatingCable

Ground Braid(typical)

AmbientSensor

Bulb

If using extension wiringfor remote placement of

sensor bulb, refer todrawing R50-052-A020

ASD-8C Controller

15 ft LongSensorLead

Heater On Indication Light

When rocker switchis set to HAND

position, heaters areenergized, regardlessof ambient conditions

ToHeaterCircuit

Line208V or 240V

Supply

UL ListedGround Fault

Circuit Breakers(by others)

120V Supply(Protected

Circuit)

L

N

Field Wiring(by others, typ)

120V or 277VSupply

Line

Neutral

Line

Sample WiringTo

HeaterCircuit

THE INTERVAL TIMER IS USED ONLY IN THE ASD-8C MODEL:

In order to reduce heating system overall peak current, the ASD-8C Controller uses an interval timer to delay the powering of specified heater circuits at system start-up. When the ambient temperature falls below the Heater On set point, all heaters wired through contactors C1 & C2 are energized upon call for power from the controller, and the timer begins its programmed ON Delay countdown. Upon completion of the countdown, heaters wired through contactors C3 & C4 are then energized.ON Delay Function:

A1

15

16

A2

18

B1

Time:.2 (0.2 x Range)

Range:10m (10 min)

Function:E (ON Delay)

Function E (ON Delay) delays operation of a specified group of heaters for the timer's specified interval. Two events can initiate this interval period: 1. Control system's HOA switch is reset from Off or Auto mode to Hand mode.2. Control system's HOA switch is set to Auto mode and ambient conditions cause temperature controller to call for heater power. The timer’s settings can be field adjusted for local ambient conditions

WIRING DIAGRAM ASD-8C CONTROLLER (1 TO 8 CIRCUITS)

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Junction Box

Control Panel

TempController

Terminal Blocks(refer to control panel

drawing for properconnections)

RTD Lead / Extension WireField Connections

(route wires to provide physicalprotection and for aesthetics)Note: When joining the small

gauge RTD lead wires to heavierguage extension wires, strip back

the insulation far enough todouble over the RTD wires.

15 ftFactoryLead

MountingScrew

(by others)


Dwg SizeScaleNone A

Drawing Number Rev

DateRev Description

10-June-2003 Ambient RTD SensorInstallation

R50-052-A020 7

Place Ambient RTD Sensor in shaded area(typically on North side of building under thesoffit) away from any heat source (such assolar gain or heated vents) that would createa false (and higher) reading.

Place Loop Strap around RTD, betweenpieces of shrink tube. Secure with a mountingscrew (by others)

Route the RTD lead wire to junction box.

Route copper extension wire (note gauge vslength) to the proper terminal blocks in thecontrol panel, as specified in the ControlPanel drawing.

IMPORTANT: Do not exceed maximumextension wire length versus wire gauge.(refer to listing at left)

1.

2.

3.

4.

1 01-Aug-2003 Change RTD lead to 15 ft2 07-Dec-2009 Revised installation procedure Step 1

BySLSL

Installation Procedure:

Note: The NEC (NationalElectrical Code) allows therouting of control wiring inthe same conduit andjunction box as the powerwiring. The electricalinsulation rating on thecontrol wiring must beequal to or greater than thepower wiring rating. Forexample, if the powerwiring is 300Vac, then thecontrol wiring leads mustbe 300Vac rated or greater.

Copper extension wire,300 Vac rated insulation:

- 16 gauge up to 60 ft max- 14 gauge up to 120 ft max- 12 gauge up to 240 ft max- 10 gauge up to 480 ft max

3 19-Aug-2010 Added NECNote SL4 04-May-2011 Show RTD positioned under eave SL

AmbientRTD

Sensor

BBllddggWWaall

ll

LoopStrap

MountingClip

SSooffffiitt

AmbientRTD

Sensor

5 06-June-2011 Added RTD wire note SL6 21-Oct-2014 Added "Typical Location" note SL

TY PIC A LL O C A TIO N



7 16-June-2015 Contact and logo updates SLAMBIENT TEMPERATURE SENSING WITH LOW TEMP CUTOUT FOR ROOF ICE MELT SYSTEMS ASD CONTROLLER

Ambient Temperature Sensing with Low Temp Cutout for Roof Ice Melt SystemsASD Controller

Heater On Set Value

When the ambient temperature falls below theHeater On set value (SEt 1), the Heater OnIndication Light will illuminate, indicating that theheater circuits are energized (unless theambient temperature falls below the Low TempCutout set value).

Adjusting Set Values

Two set values are available:SEt 1 = Heater OnSEt 2 = Low Temp Cutout

To toggle between which set value is displayed,press the up arrow. To change the displayed setvalue, hold down the square button and press theup or down arrow (the longer the arrow button isheld down, the faster the value will change).

TC544A DescPg AmbRIM LTcutout ASD 34F 10F v02 Page 1 of 1

Heater OnIndicationLight

Low TempCutoutIndicationLight (light onindicates lowtemp cutout isnot activated)

Heater OnSet Value [SEt 1](SV=Set Value)

AmbientTemperature(PV=Process Value)

Low Temp Cutout Set Value

If the ambient temperature falls below the LowTemp Cutout set value (SEt 2), the Low TempCutout Indication Light will turn off, indicating thatthe heater circuits have been de-energized (theHeater On Indication Light remains on). Theheater circuits will be re-energized when theambient temperature rises above the Low TempCutout set value.

Note: Low Temp Cutout can be avoided bysetting its value below the lowest expectedambient temperature (for example: –150).


Low TempCutoutIndicationLight (light offindicates lowtemp cutout isactivated)

Low Temp CutoutSet Value [SEt 2](SV=Set Value)


Temperature Controller

Thermal Building Solutions4800 Golden Foothill Parkway, El Dorado Hills, CA 95762Office: +1.916.933.5666 / Fax: +1.916.933.5959 / www.BylinUSA.com


Heater On Set Value



















AMBIENT RTD SENSOR INSTALLATION

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Heater On Set Value



















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PROGRAM VALUES - AMBIENT TEMPERATURE SENSING WITH LOW TEMP CUTOUT FOR ROOF ICE MELT APPLICATIONS, ASD CONTROLLER

Pro

gram

Val

ues

-Am

bien

tTem

pera

ture

Sen

sing

with

Low

Tem

pC

utou

tfor

Roo

fIce

Mel

tApp

licat

ions

,AS

DC

ontr

olle

r

Pag

e1

of1

Sel

ecTC

544A

Pro

gVal

Am

bRIM

LTcu

tout

AS

D34

F10

Fv0

3

0.5

0.5

LOC

K

LOC

K

AB

S

Not

allp

aram

eter

ssh

own

are

avai

labl

efo

ruse

onth

isco

ntro

llerm

odel

.

=M

anuf

actu

rer's

defa

ultv

alue

.

=P

rogr

amm

edva

lue

fort

his

appl

icat

ion.

Def

ault

Set

Val

ues:

1)H

eate

rOn

(SE

t1)=

342)

Low

Tem

pC

utou

t(S

Et2

)=10

Err

orD

ispl

ay

Err

orC

ontr

olO

utpu

tSta

tus

Mea

ning

Sen

sorb

reak

/ov

erra

nge

cond

ition

Sen

sorr

ever

se/

unde

rran

geco

nditi

on

OFF

OFF

DTR

F

-150

150

ON

F

FD

– –

–

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©2019 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without notice.

RAYCHEM-IM-H59371-RIMASD-EN-1908

North America Tel: +1.800.545.6258Fax: [email protected]

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Documents

ASD Controller...10m (10 min) Function: E (ON Delay) Function E (ON Delay) delays operation of a specified group of heaters for the timer's specified interval. Two events can initiate