Ambient Sensing for Roof & Gutter Deicing Systems
Installation Manual
ASD Controller
2 | nVent.com
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 outdoor
enclosure with lockable hasps. Enclosure outside dimensions
for each model are:
ASD-4C: 11-1/8" h x 9-1/4" w x 5-1/4" d
ASD-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.
nVent.com | 3
Date TitleDrawn By
SL
Dwg Size
Scale
17-Mar-2011
None
A
Drawing Number
R50-019-A010
Rev
2
! " #$%$& ! $' ()*+#*, -
Typical System Layout
AS-Digital Controller
. /
North
AS-Digital Controller
(switches up to four 30A
branch circuits)
Branch Circuit
Breaker Panel
(GFCB 30mA Trip)
(by others)
Junction
Box
(typical)
Ambient Sensor
(outdoors, shaded,
North side of building)
Cable feed
through bottom
of downspout
Cable feed
at soffit
Cable feed
through bottom
of downspout
Cable feed
at soffit
Indoor Location
(garage or similar)
0 1234(#31205 67%$&*' $8 96! (, - #), ::$) +; , #, < %=!
Thermal Building Solutions
4800 Golden Foothill Parkway
El Dorado Hills, CA 95762
Phone: 916-933-5666 / Fax: 916-933-5959
1 0>3?@- $3120A 67B, - #" (#"- 8 :, C, @+8"#$'
Date TitleDrawn By
SL
Dwg SizeScale
01-Sept-2015
None B
Wiring Diagram
ASD-4C Controller
1 to 4 Circuits
Drawing Number
R50-050-A022-4C
Rev
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
Thermal Building Solutions
4800 Golden Foothill Parkway
El Dorado Hills, CA 95762
Phone: 916-933-5666 / Fax: 916-933-5959
X2
A1
A2
X1
AUTO
OFF
HAND
1 3 5 7
2 4 6 8
C1
A1 A2
1 3 5 7
2 4 6 8
C2
A1 A2
Line
208V or 240V
Supply
UL Listed
Ground Fault
Circuit Breakers
(by others)
To
Heating
Cable
Ground Braid
(typical)
120V Supply
(Protected
Circuit)
L
N
Ambient
Sensor
Bulb
To
Heater
Circuit
If using extension wiring for
remote placement of sensor bulb,
refer to drawing R50-052-A020
ASD-4C Controller
15 ft Long
Sensor
Lead
Field Wiring
(by others, typ)
Heater On Indication Light
When rocker switch
is set to HAND
position, heaters are
energized, regardless
of ambient conditions
120V or 277V
Supply
Line
Neutral
Line
To
Heater
Circuit
Sample Wiring
TYPICAL SYSTEM LAYOUT
WIRING DIAGRAM ASD-4C CONTROLLER (1 TO 4 CIRCUITS)
4 | nVent.com
Date TitleDrawn By
SL
Dwg SizeScale
01-Sept-2015
None B
Drawing Number
R50-050-A022-8 C
Rev
0
= Factory Wiring
= Field Wiring, As Req’d*
(contactor general p urpose AC1 rating = 30A)
Key:
*Consult NEC for proper wire gauge to use with CB size.
DateRev Description By
Thermal Building Solutions
4800 Golden Foothill Parkway
El Dorado Hills, CA 95762
Phone: 916-933-5666 / Fax: 916-933-5959
Wiring Diagram
ASD-8C Controller
1 to 8 Circuits
AUTO
OFF
HAND
1 3 5 7
2 4 6 8
C2
A1 A2
X2
A1
A2
X1
1 3 5 7
2 4 6 8
C1
A1 A2
A1
15
16
A2
18
B1
TRL04
1 3 5 7
2 4 6 8
C3
A1 A2
1 3 5 7
2 4 6 8
C4
A1 A2
To
Heating
Cable
Ground Braid
(typical)
Ambient
Sensor
Bulb
If using extension wiring
for remote placement of
sensor bulb, refer to
drawing R50-052-A020
ASD-8C Controller
15 ft Long
Sensor
Lead
Heater On Indication Light
When rocker switch
is set to HAND
position, heaters are
energized, regardless
of ambient conditions
To
Heater
Circuit
Line
208V or 240V
Supply
UL Listed
Ground Fault
Circuit Breakers
(by others)
120V Supply
(Protected
Circuit)
L
N
Field Wiring
(by others, typ)
120V or 277V
Supply
Line
Neutral
Line
Sample Wiring
To
Heater
Circuit
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)
nVent.com | 5
Junction Box
Control Panel
Temp
Controller
Terminal Blocks
(refer to control panel
drawing for proper
connections)
RTD Lead / Extension Wire
Field Connections
(route wires to provide physical
protection and for aesthetics)
Note: When joining the small
gauge RTD lead wires to heavier
guage extension wires, strip back
the insulation far enough to
double over the R TD wires.
15 ft
Factory
Lead
Mounting
Screw
(by others)
Date TitleDrawn By
SL
Dwg SizeScale
None A
Drawing Number Rev
DateRev Description
10-June-2003
Ambient RTD Sensor
Installation
R50-052-A020 7
Place Ambient RTD Sensor in shaded area
(typically on North side of building under the
soffit) away from any heat source (such as
solar gain or heated vents) that would create
a false (and higher) reading.
Place Loop Strap around R TD, between
pieces of shrink tube. Secure with a mounting
screw (by others)
Route the R TD lead wire to junction box.
Route copper extension wire (note gauge vs
length) to the proper terminal blocks in the
control panel, as specified in the Control
Pane
l drawing.
IMPORTANT: Do not exceed maximum
extension wire length versus wire gauge.
(refer to listing at left)
1.
2.
3.
4.
1 01-Aug-2003 Change RTD lead to 15 ft
2 07-Dec-2009 Revised installation procedure Step 1
By
SL
SL
Installation Procedure:
Note: The NEC (National
Electrical Code) allows the
routing of control wiring in
the same conduit and
junction box as the power
wiring. The electrical
insulation rating on the
control wiring must be
equal to or greater than the
power wiring rating. For
example, if the power
wiring is 300Vac, then the
control wiring leads must
be 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 g
auge up to 480 ft max
3 19-Aug-2010 Added NEC Note SL
4 04-May-2011 Show RTD positioned under eave SL
Ambient
RTD
Sensor
BBl
ld
dg
g
W
Wa
al
ll
l
Loop
Strap
Mounting
Clip
SSooffffiitt
Ambient
RTD
Sensor
5 06-June-2011 Added RTD wire note SL
6 21-Oct-2014 Added "Typical Location" note SL
TYPIC AL
L O C ATIO N
Thermal Building Solutions
4800 Golden Foothill Parkway
El Dorado Hills, CA 95762
Phone: 916-933-5666 / Fax: 916-933-5959
7 16-June-2015 Contact and logo updates SL
AMBIENT TEMPERATURE SENSING WITH LOW TEMP CUTOUT FOR ROOF ICE MELT SYSTEMS ASD CONTROLLER
Ambient Temperature Sensing with Low Temp Cutout for Roof Ice Melt Systems
ASD Controller
Heater On Set Value
When the ambient temperature falls below the
Heater On set value (SEt 1), the Heater On
Indication Light will illuminate, indicating that the
heater circuits are energized (unless the
ambient temperature falls below the Low Temp
Cutout set value).
Adjusting Set Values
Two set values are available:
SEt 1 = Heater On
SEt 2 = Low Temp Cutout
To toggle between which set value is displayed,
press the up arrow. To change the displayed set
value, hold down the square button and press the
up or down arrow (the longer the arrow button is
held down, the faster the value will change).
TC544A DescPg AmbRIM LTcutout ASD 34F 10F v02 Page 1 of 1
Heater On
Indication
Light
Low Temp
Cutout
Indication
Light (light on
indicates low
temp cutout is
not activated)
Heater On
Set Value [SEt 1]
(SV=Set Value)
Ambient
Temperature
(PV=Process Value)
Low Temp Cutout Set Value
If the ambient temperature falls below the Low
Temp Cutout set value (SEt 2), the Low Temp
Cutout Indication Light will turn off, indicating that
the heater circuits have been de-energized (the
Heater On Indication Light remains on). The
heater circuits will be re-energized when the
ambient temperature rises above the Low Temp
Cutout set value.
Note: Low Temp Cutout can be avoided by
setting its value below the lowest expected
ambient temperature (
for example: –150).
Heater On
Indication
Light
Low Temp
Cutout
Indication
Light (light off
indicates low
temp cutout is
activated)
Low Temp Cutout
Set Value [SEt 2]
(SV=Set Value)
Ambient
Temperature
(PV=Process Value)
Temperature Controller
Thermal BuildingSolutions
4800 Golden Foothill Parkway, El Dorado Hills, CA 95762
Office: +1.916.933.5666 / Fax: +1.916.933.5959 / www.BylinUSA.com
Ambient Temperature Sensing with Low Temp Cutout for Roof Ice Melt Systems
ASD Controller
Heater On Set Value
When the ambient temperature falls below the
Heater On set value (SEt 1), the Heater On
Indication Light will illuminate, indicating that the
heater circuits are energized (unless the
ambient temperature falls below the Low Temp
Cutout set value).
Adjusting Set Values
Two set values are available:
SEt 1 = Heater On
SEt 2 = Low Temp Cutout
To toggle between which set value is displayed,
press the up arrow. To change the displayed set
value, hold down the square button and press the
up or down arrow (the longer the arrow button is
held down, the faster the value will change).
TC544A DescPg AmbRIM LTcutout ASD 34F 10F v02 Page 1 of 1
Heater On
Indication
Light
Low Temp
Cutout
Indication
Light (light on
indicates low
temp cutout is
not activated)
Heater On
Set Value [SEt 1]
(SV=Set Value)
Ambient
Temperature
(PV=Process Value)
Low Temp Cutout Set Value
If the ambient temperature falls below the Low
Temp Cutout set value (SEt 2), the Low Temp
Cutout Indication Light will turn off, indicating that
the heater circuits have been de-energized (the
Heater On Indication Light remains on). The
heater circuits
will be re-energized when the
ambient temperature rises above the Low Temp
Cutout set value.
Note: Low Temp Cutout can be avoided by
setting its value below the lowest expected
ambient temperature (for example: –150).
Heater On
Indication
Light
Low Temp
Cutout
Indication
Light (light off
indicates low
temp cutout is
activated)
Low Temp Cutout
Set Value [SEt 2]
(SV=Set Value)
Ambient
Temperature
(PV=Process Value)
Temperature Controller
Thermal BuildingSolutions
4800 Golden Foothill Parkway, El Dorado Hills, CA 95762
Office: +1.916.933.5666 / Fax: +1.916.933.5959 / www.BylinUSA.com
AMBIENT RTD SENSOR INSTALLATION
6 | nVent.com
Ambient Temperature Sensing with Low Temp Cutout for Roof Ice Melt Systems
ASD Controller
Heater On Set Value
When the ambient temperature falls below the
Heater On set value (SEt 1), the Heater On
Indication Light will illuminate, indicating that the
heater circuits are energized (unless the
ambient temperature falls below the Low Temp
Cutout set value).
Adjusting Set Values
Two set values are available:
SEt 1 = Heater On
SEt 2 = Low Temp Cutout
To toggle between which set va
lue is displayed,
press the up arrow. To change the displayed set
value, hold down the square button and press the
up or down arrow (the longer the arrow button is
held down, the faster the value will change).
TC544A DescPg AmbRIM LTcutout ASD 34F 10F v02 Page 1 of 1
Heater On
Indication
Light
Low Temp
Cutout
Indication
Light (light on
indicates low
temp cutout is
not activated)
Heater On
Set Value [SEt 1]
(SV=Set Value)
Ambient
Temperature
(PV=Process Value)
Low Temp Cutout Set Value
If the ambient temperature falls below the Low
Temp Cutout set value (SEt 2), the Low Temp
Cutout Indication Light will turn off, indicating that
the heater circuits have been de-energized (the
Heater On Indication Light remains on). The
heater circuits will be re-energized when the
ambient temperature rises above the Low Temp
Cutout set value.
Note: Low Temp Cutout can be avoided by
setting its value below the lowest expected
ambient temperature (
for example: –150).
Heater On
Indication
Light
Low Temp
Cutout
Indication
Light (light off
indicates low
temp cutout is
activated)
Low Temp Cutout
Set Value [SEt 2]
(SV=Set Value)
Ambient
Temperature
(PV=Process Value)
Temperature Controller
Thermal BuildingSolutions
4800 Golden Foothill Parkway, El Dorado Hills, CA 95762
Office: +1.916.933.5666 / Fax: +1.916.933.5959 / www.BylinUSA.com
nVent.com | 7
PROGRAM VALUES - AMBIENT TEMPERATURE SENSING WITH
LOW TEMP CUTOUT FOR ROOF ICE MELT APPLICATIONS, ASD CONTROLLER
Program Values - Ambient Temperature Sensing with Low Temp Cutout for Roof Ice Melt Applications, ASD Controller
Page 1 of 1Selec TC544A ProgVal AmbRIM LTcutout ASD 34F 10F v03
0.5
0.5
LOCK
LOCK
ABS
Not all parameters shown are available
for use on this controller model.
= Manufacturer's default value.
= Programmed value for this
application.
Default Set Values:
1) Heater On (SEt 1) = 34
2) Low Temp Cutout (SEt 2) = 10
Error Display
Error Control Output Status
Meaning
Sensor break /
over range condition
Sensor reverse /
under range condition
OFF
OFF
DTR
F
-150
150
ONF
FD
–
–
–
©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: +1.800.545.6258
Fax: +1.800.527.5703
nVent.com
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Raychem ASD Controller Installation guide
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