Viega Basic Heating Control User manual

Radiant
Basic Heating Control
Installation Manual
March 2009

2VIEGA 1-800-976-9819 PI-16015-03/09
The Viega Basic Heating Control is designed to control the supply water temperature to a hydronic system in order
to provide outdoor reset operation. The Basic Heating Control uses a oating action actuator mounted on a divert-
ing or mixing valve to regulate the supply water temperature. The control has a Liquid Crystal Display (LCD) to view
system status and operating information.
Additional functions include:
• User comfort adjustment to increase or decrease building space temperature
• Advanced settings to ne-tune building requirements
• Optional indoor sensor for room air temperature control
• Test sequence to ensure proper component operation
• 120 VAC power supply
• Powered system circulator pump output
• CSA C US certied (approved to applicable UL standards)

3VIEGA 1-800-976-9819 PI-16015-03/09
CONTENTS
1 General Operation
1.1 Using the Control 4
1.2 Description of Display 4
2 Control Operation
2.1 General Operation 5
2.2 Control Features 5
3 Temperature Control
3.1 General Information 6
3.2 Installer Information 6
3.3 Advanced Information 6
4 Boiler Control 7
5 Installation
5.1 Mounting & Rough-in 8
5.2 Electrical Connections 10
5.3 Testingthe Wiring 11
5.4 DIP Switch Settings 13
5.5 View Menu Settings 13
5.6 Adjust Menu Settings 14
5.7 Testing 15
6 Troubleshooting 16
7 Mechanical and
Electrical Diagrams 18
8 Technical Data 20
How To Use This Instruction Manual
This manual is organized into the following four main topics:
Operation (Sections 1 and 2), which describes how to read the control and use the LCD display
Control (Sections 3 and 4), which discusses how the mixing device and boiler are controlled
Installation (Section 5), which details the mounting and connection process for the control and sensors
Troubleshooting, Mechanical, and Technical Data (Sections 6, 7, and 8), which provide help with xing problems
and correcting errors.
We recommend rst reading Sections 1 and 2, as these contain important information on the overall operation and use
of the control. For a quick installation and setup of the control, refer to Section 5, Installation. Mount and connect the
control as described in Sections 5.1 - 5.3, and then set the DIP switches and the parameters of the control as discussed
in Sections 5.4 and 5.6.
The Installation section (starting at 5.4 DIP Switch Settings) of this manual describes the various items that are adjusted
and displayed by the control. The control functions of each adjustable item are described in Sections 3 and 4.

4VIEGA 1-800-976-9819 PI-16015-03/09
Item
The abbreviated name of the
selected item will be displayed in
the item eld of the display. To view
the next available item, press and
release the Item button. Once you
have reached the last available item,
pressing and releasing the Item
button will return the display to the
rst item.
1 General Operation
1.1 Using the Control
The Basic Heating Control uses a
Liquid Crystal Display (LCD) as the
method of supplying information.
You use the LCD in order to set up
and monitor the operation of your
system. The Basic Heating Control
has three push buttons (Item, , )
for selecting and adjusting settings.
As you program your control, record
your Adjust Menu settings for future
reference or troubleshooting.
1.2 Description of Display
Circulator
Displays when the system
circulator is in operation
Burner
Displays when the boiler
relay is turned on
°F, °C
Displays the units of
measurement that all of
the temperatures are to be
displayed in the control
Pointer
Displays the actuator
operation as indicated
(open/close)
Adjust
To make an adjustment to a setting
in the control, press and hold
simultaneously for 1 second, the
Item, and buttons. The display
will then show the word ADJUST in
the top right corner. Then select the
desired item using the Item button.
Finally, use the and/or button to
make the adjustment.
To exit the adjust menu, the control
must be left alone for 20 seconds.
When the Item button is pressed
and held in the VIEW menu, the
control scrolls through all the control
adjust items in both access levels.
Additional information can be gained
by observing the Status eld and
Pointers of the LCD. The Status eld
will indicate which of the control’s
outputs are currently active. Most
symbols in the status eld are
only visible when the VIEW menu
is selected.
°F
°C
GENERAL OPERATION - CHAPTER 1

5VIEGA 1-800-976-9819 PI-16015-03/09
2 Control Operation
2.1 General Operation
When the Basic Heating Control is
powered up, the control displays the
control type number in the LCD for 2
seconds. Next, the software version
is displayed for 2 seconds. Finally,
the control enters into the normal
operating mode.
The Basic Heating Control uses a
oating action mixing or injection valve
to vary the supply water temperature
to a hydronic system. The supply
water temperature is based on
the outdoor temperature.
The maximum water temperature
setting in the Basic Heating Control
should not be used as a safety high
limit control. To protect oors from
high water temperatures in case of
main control failure or removal, use a
Viega Modulating Safety High Limit
Control (stock code 16116) on the
outlet injection valve of the
Injection Station.
2.2 Control Features
2.2.1 Outdoor Reset
The Basic Heating Control calculates
a mixing supply water temperature
based on the outdoor air temperature.
The Basic Heating Control uses a
heating curve and optional indoor
temperature feedback from an indoor
sensor in this calculation.
2.2.2 Floating action
A 24 V (AC) oating action actuator
motor is connected directly to
the Basic Heating Control on the
Com, Opn and Cls terminals (7, 8,
and 9). The Basic Heating Control
pulses the actuator motor open
or closed to maintain the correct
mixed supply water temperature at
the supply sensor. The valve that
the actuator is connected to can
be either an injection valve (on the
Injection Station), a mixing valve, or
a diverting valve. A visual indication
as to whether the control is currently
opening or closing the mixing valve
is displayed in the LCD.
2.2.3 Warm Weather Shut Down
The Basic Heating Control monitors
the outdoor temperature and shuts
off the heating system seasonally
when outdoor temperatures exceed
the WWSD setting. This reduces
energy use during the summer
when the heating system is not
needed and saves wear on system
components. To prevent the system
from seizing due to long periods of
no use, the circulator, actuator, and
valve are exercised periodically (see
below).
2.2.4 Exercising
The Basic Heating Control has a
built-in exercising function. If the
system pump or valve has not
been operated at least once every
3 days, the control turns on the
output for a minimum of 10 seconds.
This minimizes the possibility of
a circulator pump or valve seizing
during a long period of inactivity.
The Basic Heating Control ensures
that the mixing valve operates over
its entire range at least once each
exercising period. While the control
is exercising, the Test LED ashes.
Note: The exercising function does
not work if power to the control,
circulator, or valve is disconnected.
CONTROL OPERATION - CHAPTER 2

6VIEGA 1-800-976-9819 PI-16015-03/09
3 Temperature Control
3.1 General Information
SYSTEM CIRCULATOR PUMP
OPERATION
(Sys Pmp)
The system circulator pump contact
(Sys Pmp, terminal 3) remains closed
as long as the Basic Heating Control
is not in Warm Weather Shut Down.
During WWSD, the system Circulator
is operated periodically based on the
Exercise feature.
MIXING TARGET TEMPERATURE
(MIX TARGET)
The MIX TARGET temperature is
calculated from the heating curve
settings, outdoor air temperature,
and optionally, indoor air
temperature. The control displays
the temperature that it is currently
trying to maintain as the mixing
supply temperature.
INDOOR SENSOR (optional)
An indoor sensor may be used in
order to provide indoor temperature
feedback. The indoor sensor is
connected to the Com and Indr
terminals (11 and 13). With the
indoor sensor connected, the Basic
Heating Control is able to sense
the actual room temperature. With
this information, the Basic Heating
Control ne-tunes the supply water
temperature in the mixing system to
prevent overheating or underheating.
To adjust the room temperature for
the mixing zone, use the ROOM
setting in the ADJUST menu at
the control.
If a multiple zone system with
thermostats is used with an indoor
sensor, proper placement of the
indoor sensor is essential. The
indoor sensor should be located
in an area that best represents the
highest heat loss of the zones.
Mount it on an inside wall, away
from drafts, heat sources, or
direct sunlight.
3.2 Installer Information
OUTDOOR DESIGN
(OUTDR DSGN)
The OUTDR DSGN is the outdoor
air temperature that is typically
the coldest temperature of the
year where the building is located.
This temperature is used when
performing the heat loss calculations
for the building. If a cold outdoor
design temperature is selected, the
mixing supply temperature rises
gradually as the outdoor temperature
drops. If a warm outdoor design
temperature is selected, the mixing
supply temperature rises rapidly as
the outdoor temperature drops.
ROOM
(ROOM)
The ROOM is the desired room
temperature for the mixing zones
and it provides a parallel shift
TEMPERATURE CONTROL - CHAPTER 3
3.3 Advanced Information
MIXING INDOOR (MIX INDR)
The MIX INDR is the room
temperature used in the original
heat loss calculations for the
building. This setting establishes the
beginning of the Heating Curve for
the mixing zones.
MIXING MAXIMUM (MIX MAX)
The MIX MAX sets the highest
water temperature that the control
is allowed to calculate as the MIX
TARGET temperature. If the control
does target the MIX MAX setting,
and the MIX temperature is near the
MIX MAX, the MAX segment will be
displayed in the LCD while either the
MIX TARGET temperature or the MIX
temperature is being viewed.
WARM WEATHER SHUT DOWN
(WWSD)
When the outdoor air temperature
rises above the WWSD setting, the
Basic Heating Control turns on the
WWSD segment in the display. When
the control is in Warm Weather Shut
Down, the control does not operate
the heating system (except for
exercising - see section 2.2.4).
of the Heating Curve. The room
temperature desired by the
occupants is often different from
the design indoor temperature (MIX
INDR). If the room temperature is not
correct, adjusting the ROOM setting
increases or decreases the amount
of heat available to the building.
MIX DESIGN (MIX DSGN)
The MIX DSGN temperature is the
supply water temperature required
to heat the mixing zones when the
outdoor air is as cold as the OUTDR
DSGN temperature.

7VIEGA 1-800-976-9819 PI-16015-03/09
4 Boiler Control
4.1 Boiler Operation
When the Basic Heating Control
determines that boiler operation
is required, the Boiler contact
terminals (5 and 6) close. While the
Boiler contact is closed, the burner
segment in the LCD is displayed.
4.2 Boiler Enable
(Boiler Enable 30% / Boiler Enable
10%)
The Basic Heating Control has
a DIP switch that allows for the
selection between a 30% boiler
enable and a 10% boiler enable.
In the 30% position, the Basic
Heating Control closes the boiler
contact when the position of the
mixing valve exceeds 30%. The
boiler contact remains closed until
the position of the mixing valve
reduces below 15%. This setting
would normally be chosen for low
mass boilers (copper n tube, etc.),
or systems with low thermal mass in
the loop between the boiler and the
mixing valve (recommended for most
Viega applications).
In the 10% position, the Basic
Heating Control closes the boiler
contact when the position of the
mixing valve exceeds 10%. The
boiler contact remains closed until
the position of the mixing valve
reduces below 5%. This setting
is normally chosen for high mass
boilers (cast iron, steel re tube, etc.)
or systems with large thermal mass
in the loop between the boiler and
the mixing valve.
BOILER CONTROL - CHAPTER 4

8VIEGA 1-800-976-9819 PI-16015-03/09
5 Installation
CAUTION
Improper installation and operation
of this control could result in damage
to the equipment and possibly
even personal injury. It is your
responsibility to ensure that this
control is safely installed according
to all applicable codes and
standards. This electronic control
is not intended for use as a primary
limit control. Other controls that
are intended and certied as safety
limits must be placed into the control
circuit.
5.1 Mounting and Rough-in
Check the contents of this package.
If any of the contents listed are
missing or damaged, please
contact your wholesaler or sales
representative for assistance.
The Basic Heating Control includes:
One Basic Heating Control,
One Outdoor Sensor, and One
Supply Sensor.
Note: Carefully read the details of
the Sequence of Operation to ensure
that you have chosen the proper
control for your application.
Mounting
Remove the control from its base by
pressing down on the release clip in
the wiring chamber and sliding the
control upward. The base may then
be mounted by screwing it to a wall
or mounting board (screws
not included).
Rough-in
All electrical wiring terminates in the
control base wiring chamber. The
base has standard 7/8" (22 mm)
knockouts, which accept common
wiring hardware and conduit ttings.
Before removing the knockouts,
check the wiring diagram and select
those sections of the chamber with
common voltages. Do not allow the
wiring to cross between sections as
the wires will interfere with safety
dividers that should be installed at a
later time.
Power must not be applied to any
of the wires during the rough-in
wiring stage.
• Install the Outdoor Sensor and
Supply Sensor according to the
instructions on page 9 and run the
wiring back to the control.
• If an Indoor Sensor (optional) is
used, install the sensor according to
the instructions included with it and
run the wiring back to the control.
• Run wire from other system
components (circulator pump, boiler,
actuating motor, etc.) to the control.
• Run wires from the 120 VAC power
to the control. Use a clean power
source to ensure proper operation.
Multi-strand 16 AWG wire is
recommended for all 120 VAC wiring
due to its superior exibility and ease
of installation into the terminals.
Mounting holes
Release
clip
Conduit knockouts on back and bottom
Press down at grips on top of cover, then
pull out and down to release cover.
Loosen screws at front
and pull wiring cover straight out.
Remove safety dividers by pulling them
straight out.
Press release clip on base and slide
control upward.
The control lifts up and away from the
base, which is ready for mounting.
Wiring can enter from bottom or back of
enclosure. Knockouts allow wiring to be
run in conduit.
INSTALLATION - CHAPTER 5

9VIEGA 1-800-976-9819 PI-16015-03/09
Installing the Outdoor Sensor
The Outdoor Sensor includes a
10kΩ thermistor that provides an
accurate measurement of the
outdoor temperature. The sensor
is protected by a white U.V. resistant
plastic enclosure.
Remove the screw and pull the front
cover off the sensor enclosure.
The Outdoor Sensor can either be
mounted directly onto a wall or a
2" x 4" electrical box. When the
sensor is wall mounted, the wiring
should enter through the back or
bottom of the enclosure. Do not
mount the sensor with the conduit
knockout facing upward as rain
could enter the enclosure and
damage the sensor.
In order to prevent heat transmitted
through the wall from affecting the
sensor reading, it may be necessary
to install an insulating barrier behind
the enclosure.
The Outdoor Sensor should be
mounted on a wall that best
represents the heat load on the
building (a northern wall for most
buildings, and a southern facing wall
for buildings with large south facing
glass areas). The sensor should not
be exposed to heat sources such as
ventilation or window openings.
The Outdoor Sensor should be
installed at an elevation above the
ground that will prevent accidental
damage or tampering, and where it
will not be covered by drifting snow
during the winter.
Connect 18 AWG or similar wire to
the two terminals provided in the
enclosure and run the wires from
the sensor to the control. Do not
run the wires parallel to telephone
or power cables. If the sensor
wires are located in an area with
strong sources of electromagnetic
interference (EMI), shielded cable or
twisted pair should be used or the
wires can be run in a grounded metal
conduit. If using shielded cable, the
shield wire should be connected
to the COM sensor terminal on the
control and not to earth ground.
Replace the front cover of the
sensor enclosure.
When more than one Basic Heating
Control is used on a project, the
Outdoor Sensors can be combined
into one enclosure by adding the
Multiple Outdoor Sensor module
(stock code 16020). This mounts
in the Outdoor Sensor enclosure
and allows up to four controls to
have outdoor sensors within
one enclosure.
Installing the Supply Sensor
Note: This sensor is designed to
mount on a pipe or in a temperature
immersion well.
The Supply Sensor can be strapped
directly to the pipe using a plastic
cable tie. Insulation should be
placed around the sensor to reduce
the effect of air currents on the
sensor measurement.
The Supply Sensor should be placed
downstream of a pump or after
an elbow or similar tting. This is
especially important if large diameter
pipes are used, as the thermal
stratication within the pipe can
result in erroneous sensor readings.
Proper sensor location requires that
the uid is thoroughly mixed within
the pipe before it reaches the sensor.
When using the Supply Sensor with
a Viega Mixing or Injection Station,
insert the sensor into the immersion
well on the elbow below the
circulator pump.
Connect 18 AWG or similar wire
to the two wires of the sensor
and then to the control. Do not
run the wires parallel to telephone
or power cables. If the sensor
wires are located in an area with
strong sources of electromagnetic
interference (EMI), shielded cable or
twisted pair should be used or the
wires can be run in a grounded metal
conduit. If using shielded cable, the
shield wire should be connected
to the COM sensor terminal on the
control and not to earth ground.
INSTALLATION - CHAPTER 5

10VIEGA 1-800-976-9819 PI-16015-03/09
5.2 Electrical Connections
The installer should test to conrm that no voltage is present at any of the
wires. Push the control into the base and slide it down until it snaps rmly
into place.
Powered Input Connection
120 VAC POWER
Connect the 120 VAC power supply to the Power L and Power N terminals
(1 and 2). This connection provides power to the microprocessor and display
of the control. As well, this connection provides power to the Sys Pmp
terminal (3) from the Power L terminal (1).
Output Connections
SYSTEM CIRCULATOR PUMP CONTACTS (SYS PMP)
The Sys Pmp output terminal (3) on the Basic Heating Control is a powered
output. When the relay in the Basic Heating Control closes, 120 VAC is
provided to the Sys Pmp terminal (3) from the Power L terminal (1). To
operate the system circulator, connect one side of the system circulator
circuit to terminal (3) and the second side of the circulator circuit to the
neutral (N) terminal (4).
VALVE ACTUATOR
Terminals 7, 8, and 9 are powered with 24 VAC from the control. There is no
need to provide a separate 24 VAC power source for the valve actuator.
R Opn (7) is connected to the open terminal of the actuating motor and R
Cls (8) is connected to the close terminal of the actuating motor. C (9) is then
connected to the common terminal of the actuating motor.
Three Position Actuator for Stations (18003)
White wire is common
Green wire is open
Brown wire is close
Mixing Valve Actuator (20040)
Blue wire is common
Brown wire is clockwise rotation
Black wire is counter-clockwise rotation
(Whether clockwise is open or close will depend on the orientation of the
Mixing Valve – see valve instructions for details)
BOILER CONTACT
The Boiler terminals (5 and 6) are an isolated (dry) output in the Basic
Heating Control. There is no power available on these terminals from the
control. These terminals are to be used as a switch to either make or break
the boiler circuit. When the Basic Heating Control requires the boiler to re, it
closes the contact between terminals 5 and 6.
INSTALLATION - CHAPTER 5

11VIEGA 1-800-976-9819 PI-16015-03/09
5.3 Testing the Wiring
Each terminal block must be unplugged from its header on the control
before power is applied for testing. To remove the terminal block, pull
straight down from the control.
The following tests are to be performed using standard testing practices
and procedures and should only be carried out by properly trained and
experienced persons.
A good quality electrical test meter, capable of reading at least 0 - 300 VAC
and at least 0 - 2,000,000 Ohms, is essential to properly test the wiring
and sensors.
Test the Sensors
In order to test the sensors, the actual temperature at each sensor location
must be measured. A good quality digital thermometer with a surface
temperature probe is recommended for ease of use and accuracy. Where
a digital thermometer is not available, a spare sensor can be strapped
alongside the one to be tested and the readings compared. Test the sensors
according to the instructions on page 15.
Test the Power Supply
Make sure exposed wires and bare terminals are not in contact with other
wires or grounded surfaces. Turn on the power and measure the voltage
between the Power L and Power N terminals (1 and 2) using an AC voltmeter.
The reading should be between 108 and 132 VAC.
Sensor and Unpowered Input Connections
Do not apply power to these terminals as this will damage the control.
OUTDOOR SENSOR
Connect the two wires from the Outdoor Sensor to the Com and Out
terminals (11 and 12). The Outdoor Sensor is used by the Basic Heating
Control to measure the outdoor air temperature.
SUPPLY SENSOR
Connect the two wires from the Supply Sensor to the Com and Mix terminals
(10 and 11). The Supply Sensor is used by the Basic Heating Control to
measure the supply water temperature downstream of the mixing or
injection valve.
INDOOR SENSOR
If an optional indoor sensor is used, connect the two wires from the sensor
to the Com and Indr terminals (11 and 13).
INSTALLATION - CHAPTER 5

12VIEGA 1-800-976-9819 PI-16015-03/09
Test the Outputs
SYSTEM CIRCULATOR PUMP (SYS PMP)
If a system circulator pump is connected to the Sys Pmp terminal (3) and
N terminal (4), make sure that power to the terminal block is off and install
a jumper between the Power L and the Sys Pmp terminals (1 and 3). Install
a second jumper between the Power N and N terminals (2 and 4). When
power is applied to the Power L and Power N terminals (1 and 2), the system
circulator pump should start. If the circulator pump does not turn on, check
the wiring between the terminal block and circulator pump and refer to any
installation or troubleshooting information supplied with the circulator pump.
If the pump operates properly, disconnect the power and remove the
jumpers.
BOILER
If the boiler is connected to the Boiler terminals (5 and 6), make sure power
to the boiler circuit is off and install a jumper between the terminals. When
the boiler circuit is powered up, the boiler should  re. If the boiler does not
turn on, refer to any installation or troubleshooting information supplied with
the boiler. (The boiler may have a  ow switch that prevents  ring until the
boiler pump is running.) If the boiler operates properly, disconnect the power
and remove the jumper.
Connecting the Control
Make sure all power to the devices and terminal blocks is off and remove
any remaining jumpers from the terminals.
Reconnect the terminal blocks to the control by carefully aligning them with
their respective headers on the control and then pushing the terminal blocks
into the headers. The terminal blocks should snap  rmly into place.
Install the supplied safety dividers between the unpowered sensor inputs
and the powered 120 VAC or 24 VAC wiring chambers.
Apply power to the control. The operation of the control on power up is
described in section 2.1.
MIXING OR INJECTION VALVE ACTUATOR
If a  oating action actuating motor circuit is connected to the R Opn, R Cls,
and C terminals (7, 8, and 9), the control’s Test Sequence can be used to
check the motor circuit. Once the Test button is pressed, the valve should
move to the fully open position. If the motor closes instead of opening, the
wiring of the actuating motor must be reversed. Next, the actuator should
move the valve to the fully closed position. If it does not, check the wiring
between the terminals and the actuating motor. Refer to any installation or
troubleshooting information supplied with the actuator.
INSTALLATION - CHAPTER 5

13VIEGA 1-800-976-9819 PI-16015-03/09
OUTDR
Current outdoor air temperature as measured by the outdoor sensor. This is
also the default display for the control.
ROOM
Measured room air temperature as measured by the indoor sensor.
(Only visible when Indoor Sensor is connected).
MIX
Current mixed supply water temperature as measured by the supply sensor.
MIX TARGET
Target mixed supply is the temperature the control is currently trying
to maintain at the supply sensor.
(Only visible with the Advanced/Installer DIP switch set to Advanced).
5.4 DIP Switch Settings
The DIP switch settings on the
control are very important and
should be set to the appropriate
settings prior to making any
adjustments to the control through
the User Interface. The DIP switch
settings change the items that
are available to be viewed and/or
adjusted in the User Interface.
Advanced / Installer
The Advanced/Installer DIP switch
is used to select which items are
available to be viewed and/or
adjusted in the User Interface (see
Display Settings below).
Boiler Enable 30% -
Boiler Enable 10%
The position of this switch determines
at which valve position the control will
close the Boiler contact under normal
conditions. Refer to section 4.2
(page 7) for a description of the
Boiler Enable DIP.
5.5 View Menu Display Settings
Visible when the control is operating
(no buttons pressed for at least
20 seconds).
INSTALLATION - CHAPTER 5
Bloc / Station
The Bloc/Station switch is used to
select which method the system
will use to adjust supply water
temperature. The Mixing Station,
Injection Station, and Diverting
Valves use the Three Position
Actuator (stock code 18003) with
a 24 VAC oating signal to adjust
the water temperature. It takes 70
seconds for full valve travel. At 50
Hz, it takes 150 seconds to fully
open from fully closed. At 60 Hz it
takes 120 seconds to fully open from
fully closed. If using Mixing Station,
Injection Station and/or Diverting
Valves, set DIP switch to “Station.” If
using Viega’s 3-4 Way Mixing Valves
with Viega’s Mixing Valve Actuator
or the ProBloc, set DIP switch to
“Bloc.” The Mixing Valve Actuator
(stock code 20040) takes 102
seconds to fully open from
fully closed.

14VIEGA 1-800-976-9819 PI-16015-03/09
ROOM
The desired room temperature.
OUTDR DSGN
The design outdoor temperature used for calculating heat-loss. Obtained
from the Design Outdoor Temperature Chart, or Viega’s Radiant Wizard.*
MIX DSGN
The design supply water temperature obtained from the Supply Water
Temperature / BTU Output Chart, or Viega’s Radiant Wizard.
MIX INDR
The design indoor air temperature used in the heat loss calculation* for the
heating system (only visible with the Advanced/Installer DIP switch set to
Advanced). Should be equal to “ROOM,” the desired room temperature.
MIX MAX
The maximum supply temperature for the mixing system (only visible with
the Advanced/Installer DIP switch set to Advanced). This setting should not
be relied upon for a safety high limit. Install a Modulating Safety High Limit
Control (stock code 16108) on the Injection Station to protect control in case
of main control failure or removal. Set higher than “MIX DSGN” and account
for the heat loss of distribution piping.
WWSD
Warm Weather Shut Down; the design outdoor air temperature at which the
control only operates in exercising mode (only visible with the Advanced/
Installer DIP switch set to Advanced).
UNITS
The units of measure that all of the temperatures are to be displayed in the
control; either °F or °C.
* See corresponding installation manuals, i.e. Concrete System, Climate Panel, or Climate Trak,
for appropriate charts.
5.6 Adjust Menu Display Settings
To make an adjustment to a setting in the control, press and hold simultaneously for 1 second, the Item, and
buttons. The display will then show the word ADJUST in the top right corner. Then select the desired item using the
Item button. Finally, use the and/or button to make the adjustment. See sections 3.2 and 3.3 (page 6) for further
discussion on these items and their effect on control operation.
INSTALLATION - CHAPTER 5

15VIEGA 1-800-976-9819 PI-16015-03/09
TEST SEQUENCE
Each step in the test sequence lasts
10 seconds.
During the test routine, the test
sequence may be paused by
pressing the Test button. If the Test
button is not pressed again for 5
minutes while the test sequence is
paused, the control exits the entire
test routine. If the test sequence
is paused, the Test button can be
pressed again to advance to the
next step. This can also be used
to rapidly advance through the test
sequence. To reach the desired
step, repeatedly press and release
the Test button until the appropriate
device and segment in the display
turn on.
5.7 Testing the Control
The Basic Heating Control has a
built-in test routine that is used to
test the main control functions. The
Basic Heating Control continually
monitors the sensors and displays
an error message whenever a fault
is found. See the following pages for
a list of the Basic Heating Control’s
error messages and possible causes.
When the Test button is pressed, the
test light is turned on. The individual
outputs and relays are tested in the
following test sequence.
Testing Sensors
A good quality test meter capable
of measuring up to 5,000kΩ
(1kΩ = 1000Ω) is required to
measure the sensor resistance.
In addition to this, the actual
temperature must be measured with
a good quality digital thermometer.
If a thermometer is not available,
a second sensor can be placed
alongside the one to be tested and
the readings compared.
First measure the temperature using
the thermometer and then measure
the resistance of the sensor at the
control. The wires from the sensor
must not be connected to the
control while the test is performed.
Using the chart below, estimate
the temperature measured by the
sensor. The sensor and thermometer
readings should be close. If the test
meter reads a very high resistance,
there may be a broken wire, a poor
wiring connection, or a defective
sensor. If the resistance is very low,
the wiring may be shorted, there
may be moisture in the sensor,
or the sensor may be defective.
To test for a defective sensor,
measure the resistance directly
at the sensor location.
Do not apply voltage to a sensor at
any time as damage to the sensor
may result.
INSTALLATION - CHAPTER 5
Step 1 - The mixing valve is run
fully open.
Step 2 - The mixing valve is run fully
closed, and then the system
pump (Sys Pmp) is turned on.
Step 3 - The Boiler contact is turned on
for 10 seconds. After 10
seconds, the Boiler and Sys Pmp
contacts are shut off.
Step 4 - After the test sequence is
completed, the control resumes
its normal operation.

16VIEGA 1-800-976-9819 PI-16015-03/09
Establish the problem. Get as much
information from the customer as
possible about the problem. Is there
too much heat, not enough heat, or
no heat? Is the problem only in one
particular zone or area of the building
or does the problem affect the entire
system? Is this a consistent problem
or only intermittent? How long
has the problem existed? This
information is critical in diagnosing
the problem.
Understand the sequence of
operation of the system. If a
particular zone is not receiving
enough heat, which circulators or
valves in the system must operate in
order to deliver heat to the affected
zone? If the zone is receiving too
much heat, which pumps, valves, or
check valves must operate in order
to stop the delivery of heat?
Press the Test button on the control
and follow the control through the
test sequence as described in the
Testing section. Pause the control as
necessary to ensure that the correct
device is operating as it should.
Sketch the piping of the system.
This is a relatively simple step that
tends to be overlooked; however,
it can often save hours of time in
troubleshooting a system. Note
ow directions in the system paying
close attention to the location of
circulators, check valves, pressure
bypass valves, and mixing valves.
Ensure correct ow direction on all
pumps. This is also a very useful
step if additional assistance
is required.
6 Troubleshooting
When troubleshooting any heating
system, it is always a good idea to
establish a set routine to follow. By
following a consistent routine, many
hours of potential headaches can be
avoided. Below is an example
of a sequence that can be
used when diagnosing or
troubleshooting problems in
a hydronic heating system.
Document the control for future
reference. Before making any
adjustments to the control, note
all of the items that the control is
currently displaying. This includes
items such as error messages,
current temperatures and settings,
and which devices should be
operating as indicated by the LCD.
This information is an essential step
if additional assistance is required to
diagnose the problem.
Isolate the problem between the
control and the system. Now that the
sequence of operation is known and
the system is sketched, is the control
operating the proper circulators and
valves at the correct times? Is the
control receiving the correct signals
from the system as to when it should
be operating? Are the proper items
selected in the menus of the control
for the device that is to be operated?
Test the contacts, voltages, and
sensors. Using a multimeter, ensure
that the control is receiving adequate
voltage to the power terminals as
noted in the technical data. Use
the multimeter to determine if the
internal contacts on the control
are opening and closing correctly.
Follow the instructions in the Testing
the Wiring section on page 11 to
simulate closed contacts on the
terminal blocks as required. Test the
sensors as described on page 15.
What to do if the building
temperature is incorrect:
Underheating:
If the building is too cool during
cold weather, this indicates that the
upper portion of the programmed
heating curve is too low, or that the
supply water high limit (MIX MAX)
has been reached. If the supply
temperature is close to MIX MAX,
then this setting must be increased
to provide more heat (if possible
without damaging oors). Otherwise
increase the MIX DSGN temperature,
which will increase the supply water
temperature (by increasing the slope
of the heating curve).
If the building is too cool in warm
weather, increase the value of the
ROOM setpoint in the Adjust menu.
This will shift the heating curve up to
provide higher water temperatures.
Overheating:
If the building is too warm during
cold weather, decrease the value of
the MIX DSGN setting in the Adjust
menu. This will reduce the slope
of the heating curve, providing less
heat to the building at low outdoor
temperatures.
If the building is too warm during
warmer weather, reduce the value
of the ROOM setpoint in the adjust
menu. This will shift the heating
curve downward to reduce
water temperatures.
TROUBLESHOOTING - CHAPTER 6

17VIEGA 1-800-976-9819 PI-16015-03/09
E01
The control was unable to read a piece of information from its EEPROM.
This error can be caused by a noisy power source. The control will load the
factory defaults and stop operation until the settings are veried.
Shr (OUTDR)
The control is no longer able to read the Outdoor sensor due to a short
circuit. In this case the control assumes an outdoor temperature of 32°F
(0°C) and continues operation. Locate the problem as described in Section
5.7. To clear the error message from the control after the sensor has been
repaired, press the Item button.
OPn (OUTDR)
The control is no longer able to read the Outdoor sensor due to an open
circuit. In this case the control assumes an outdoor temperature of 32°F
(0°C) and continues operation. Locate the problem as described in Section
5.7. To clear the error message from the control after the sensor has been
repaired, press the Item button.
Shr (MIX)
The control is no longer able to read the Mixing Supply sensor due to a short
circuit. In this case the control will operate the mixing valve at a xed output.
Locate the problem as described in Section 5.7. To clear the error message
from the control after the sensor has been repaired, press the Item button.
OPn (MIX)
The control is no longer able to read the Mixing Supply sensor due to a open
circuit. In this case the control will operate the mixing valve at a xed output.
Locate the problem as described in Section 5.7. To clear the error message
from the control after the sensor has been repaired, press the Item button.
Shr (ROOM)
The control is no longer able to read the Indoor sensor due to a short circuit.
The control will continue to operate as if there was nothing connected to the
Indoor sensor input. Locate the problem as described in Section 5.7. To clear
the error message from the control after the sensor has been repaired, press
the Item button.
OPn (ROOM)
The control is no longer able to read the Indoor sensor due to an open
circuit. The control will continue to operate as if there was nothing connected
to the Indoor sensor input. Locate the problem as described in Section
5.7. To clear the error message from the control after the sensor has been
repaired, press the Item button.
Error Messages
TROUBLESHOOTING - CHAPTER 6

18VIEGA 1-800-976-9819 PI-16015-03/09
MECHANICAL AND ELECTRICAL DIAGRAMS - CHAPTER 7
Pump
Pump
Pump
Pump

19VIEGA 1-800-976-9819 PI-16015-03/09
MECHANICAL AND ELECTRICAL DIAGRAMS - CHAPTER 7
* Three Position Actuator: White wire common, green wire open, brown wire close.
Mixing Valve Actuator: Blue wire common, brown wire clockwise rotation, black wire counter-clockwise
rotation
*

20VIEGA 1-800-976-9819 PI-16015-03/09
Technical Data
Control Microprocessor PID control; this is not a safety (limit) control
Packaged Weight 3.1 lbs. (1420 g) Enclosure black PVC plastic
Dimensions 6-5/8" H x 7-9/16" W x 2-13/16" D (170 x 193 x 72 mm)
Approvals CSA C US, meets ICES & FCC regulations for EMI/RFI
Ambient Conditions Indoor use only, 32 to 102°F (0 to 39°C), <90% RH non-condensing
Power Supply 120 VAC +/- 10% 50/60 Hz 1300 VA
Floating Output 24 VAC 0.34 A 8 VA
Relays 240 VAC 10 A 1/3 hp, pilot duty 240 VA
Sensors NTC thermistor
Sensor Resistances
TECHNICAL DATA - CHAPTER 8