Viega ProRadiant Basic Digital Snow Melt Control... Instruction sheet

VIEGA • Viega... The global leader in plumbing and heating systems.
301 N. Main, Floor 9 • Wichita, KS 67202 • Ph: 877-Viega-NA • Fax: [phone] • E-Mail: [email protected] • www.viega.com
Product Instructions
Basic Digital Snow Melt Control II
PI-PR-17023 05/08 1 of 5
Applications
The Viega Basic Digital Snow Melt Control II
provides automatic snow melt system
activation with slab high limit.This control
senses low air temperature and precipitation
to activate the snow-ice melting system. A
slab sensor prevents overheating of the
slab. Equipped with a timer switch for
manual activation.
Features
• Snow melting by demand only
• Automatic snow melt activation
• Manual override
• Senses both temperature
and precipitation
• Simple installation and programming
• Large digital LCD display
• Reliable, economical
Specications
Digital Setpoint Control II
Input: 24VAC
Output: 2 sets of SPDT dry
contacts,
1/2 hp @ 120VAC
9.8 FLA, 58.8 LRA
Environment: -40 - 140°F
5 to 95% rH,
non-condensing
Power draw: 8 VA
Dimensions: 4.91 x 8.16 x 2.37 in.
Timer
Input: 12 to 120V, 20A
Range: 2 to 12 hours
Dimensions: 2.75 x 4.5 x 1.2 in.
Snow Detector
Input: 24VAC
Output: 24VAC signal to relay
Power draw: 2.5 watts (2.5VA)
Dimensions: 3.5 x 3.5 x 2.5 in.
o
l II
ion
A
Timer
Digital Setpoint Control II
Snow Detector

VIEGA • Viega... The global leader in plumbing and heating systems.
301 N. Main, Floor 9 • Wichita, KS 67202 • Ph: 877-Viega-NA • Fax: [phone] • E-Mail: [email protected] • www.viega.com
Product Instructions
Basic Digital Snow Melt Control II
PI-PR-17023 05/08 2 of 5
Installation
The components of the Basic Digital
Snow Melt Control II
Snow Detector (17002)
Digital Setpoint Control II
with watertight sensor (17029)
Timer Switch (17013)
Timer Face Plate (17014)
Watertight Sensor (17031)
The snow detector should be placed in
a location where it will not be covered
with drifting snow. Install a secure 1/2”
rigid conduit to show a clearance above
ground level of 2 to 3 feet minimum
(depending upon annual snowfall). The
snow detector may also be located on
an exterior wall with full exposure to
snow and ice (no overhang). The snow
detector does not have to be located
near the snow melting area, but should
have full exposure to snow and ice
(away from trees, roof overhangs, etc...).
For proper control, the sensor for the
setpoint control must be located within
the snow melting slab, and should be
placed midway between rows of
tubing. The sensor should be placed in
conduit which is cast into the slab, so
that replacement is possible. The sensor
is extendable up to 100'.
Install the timer in a 3” deep electrical
wall box with “TOP” (indicated on front
cover) in proper position. Fasten cover
to outlet box using two screws provided.
Place calibrated wall plate on timer unit
and fasten with nut provided. Push knob
onto timer shaft. If knob is not centered
on “0”, either the plate or the timer can
be rotated slightly.
Typical Snow Melt Installation
(showing additional equipment)
Typical Snow Melting Cross-Section

VIEGA • Viega... The global leader in plumbing and heating systems.
301 N. Main, Floor 9 • Wichita, KS 67202 • Ph: 877-Viega-NA • Fax: [phone] • E-Mail: [email protected] • www.viega.com
Product Instructions
Basic Digital Snow Melt Control II
PI-PR-17023 05/08 3 of 5
Wiring
Wiring the Basic Digital Snow Melt Control II with a system circulator pump and a boiler circulator pump.
Wiring the Basic Digital Snow Melt Control II with a system circulator pump and the Viega Pump and
Boiler Relay (sold separately) to control boiler activation and/or a boiler circulator pump.
Note: Installation by a licensed electrician is recommended. Installation and use of this equipment should be in
accordance with provisions of the U.S. national electric code, applicable local code and pertinent industry standards.
Note:
Connect wiring to N/O
side of Timer.
Do NOT connect 120V to
Digital Setpoint Control II.
24V power is supplied by
Timer or Snow Detector.
When connecting the
sensor connect both red
wires to one terminal and
the white wire to the other
terminal. Terrminals for
sensor marked "T".
Note:
Connect wiring to N/O side
of Timer.
Do NOT connect 120V to
Digital Setpoint Control II.
24V power is supplied by
Timer or Snow Detector.
When connecting the
sensor connect both red
wires to one terminal and
the white wire to the other
terminal. Teminals for
sensor marked "T".

VIEGA • Viega... The global leader in plumbing and heating systems.
301 N. Main, Floor 9 • Wichita, KS 67202 • Ph: 877-Viega-NA • Fax: [phone] • E-Mail: [email protected] • www.viega.com
Product Instructions
Basic Digital Snow Melt Control II
PI-PR-17023 05/08 4 of 5
Programming
Turn the timer knob clockwise past
2 to power up the digital setpoint
control. Press "MENU" button on the
control to adjust settings:
At any point during the programming
you may press the "HOME" button
to return back to the sensor viewing.
1. Press "MENU", then press the
right arrow button when the
"Program Screen" appears
2. When the "Relay Screen"
appears, press right arrow
button to select Relay 1
3. Select Setpoint 1 by pressing
the right arrow button
4. Use the up and down
arrows to adjust the Setpoint 1
to 38°F (this is the maximum
slab temperature setting of the
snow melt system)
5. Once the setpoint has been
adjusted press the right arrow
to accept and to display the
"Relay 1" menu
6. Select "Diffrntl" by pressing the
right arrow button
7. Using the up and down arrows,
adjust the differential to 2°F,
then press the right arrow button
to accept and return to the menu
8. Once you have completed
these steps either press the
"HOME" key or scroll down
using the down arrow to
"EXIT" and then press the
right arrow button
Once all programming is
complete the conguration
can be locked to prevent any
unauthorized changes.
To Lock or Unlock the
keypad simply press and hold
the "MENU" and "HOME"
buttons simultaneously for ve
seconds.
Turn the timer back to zero to
reset the system to automatic
operation.
Operation
The snow melting system will be
automatically activated when low
temperature and precipitation are
detected. The system will then
operate until the temperature rises
and/or the precipitation stops plus
a ve hour purge time to ensure
melting of all slab areas. During
operation, the setpoint control
limits the maximum slab
temperature at the setpoint
(38°F recommended) to ensure
melting while preventing the slab
from overheating.
To turn the snow melting system
on manually, turn the knob of the
timer clockwise to the desired time
period (at least 2 hours). The timer
will automatically turn the system
off at the end of this time period
(unless system has been activated
automatically by the snow
detector).

VIEGA • Viega... The global leader in plumbing and heating systems.
301 N. Main, Floor 9 • Wichita, KS 67202 • Ph: 877-Viega-NA • Fax: [phone] • E-Mail: [email protected] • www.viega.com
Product Instructions
Basic Digital Snow Melt Control II
PI-PR-17023 05/08 5 of 5
Troubleshooting
If the snowmelting system is not operating correctly, rst
check that all electrical connections have been made
properly. Check for power to all components
(120V and 24V).
If the snow detector does not activate the system during
snowfall, turn on the timer switch. If this activates the
system, replace the snow detector.
If neither the timer or snow detector turns the system on,
check the setpoint control conguration.
If the conguration is correct disconnect the slab sensor
and check its resistance. Replace the sensor if its
resistance value does not match the temperature in the
accompanying chart to the right.
Temp °F Temp °C Resistance
Ohms
-40 -40.0 851
-30 -34.4 872
-20 -28.8 893
-10 -23.3 914
0 -17.7 935
10 -12.2 956
20 -6.6 977
30 -1.1 998
40 4.4 1019
50 10.0 1040
60 15.5 1061
70 21.1 1082
80 26.6 1103
90 32.2 1124
100 37.7 1145
110 43.3 1166
120 48.8 1187
130 54.4 1208
140 60.0 1229
150 65.5 1250
160 71.1 1271
170 76.6 1292
180 82.2 1313
190 87.7 1334
200 93.3 1355
210 98.8 1376
220 104.4 1397
230 110.0 1418
240 115.5 1439
250 121.1 1460