Viega Basic Heating Control Installation Manual

Radiant
Basic Heating Control

Installation Manual

March 2009

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 divert­ing 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)

2VIEGA 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.

3VIEGA 1-800-976-9819 PI-16015-03/09

GENERAL OPERATION - CHAPTER 1

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.

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.

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.

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

°F

measurement that all of

°C

the temperatures are to be

displayed in the control

Pointer
Displays the actuator

operation as indicated
(open/close)

4VIEGA 1-800-976-9819 PI-16015-03/09

CONTROL OPERATION - CHAPTER 2

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.

5VIEGA 1-800-976-9819 PI-16015-03/09

TEMPERATURE CONTROL - CHAPTER 3

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.

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.

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.

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.

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.

ROOM
(ROOM)

The ROOM is the desired room

temperature for the mixing zones
and it provides a parallel shift

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).

6VIEGA 1-800-976-9819 PI-16015-03/09

BOILER CONTROL - CHAPTER 4

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.

7VIEGA 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.

INSTALLATION - CHAPTER 5

Press down at grips on top of cover, then

pull out and down to release cover.

Wiring can enter from bottom or back of
enclosure. Knockouts allow wiring to be

run in conduit.

Rough-in

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).

Mounting holes

Release
clip

Conduit knockouts on back and bottom

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.

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.

8VIEGA 1-800-976-9819 PI-16015-03/09

INSTALLATION - CHAPTER 5

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.

9VIEGA 1-800-976-9819 PI-16015-03/09

INSTALLATION - CHAPTER 5

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.

10VIEGA 1-800-976-9819 PI-16015-03/09

INSTALLATION - CHAPTER 5

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).

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.

11VIEGA 1-800-976-9819 PI-16015-03/09

INSTALLATION - CHAPTER 5

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.

12VIEGA 1-800-976-9819 PI-16015-03/09

INSTALLATION - CHAPTER 5

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).

5.5 View Menu Display Settings

Visible when the control is operating
(no buttons pressed for at least

20 seconds).

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.

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.

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).

13VIEGA 1-800-976-9819 PI-16015-03/09

5.6 Adjust Menu Display Settings

INSTALLATION - CHAPTER 5

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.

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.

14VIEGA 1-800-976-9819 PI-16015-03/09

INSTALLATION - CHAPTER 5

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.

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.

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.

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.

15VIEGA 1-800-976-9819 PI-16015-03/09

TROUBLESHOOTING - CHAPTER 6

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.

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.

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.

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.

16VIEGA 1-800-976-9819 PI-16015-03/09

TROUBLESHOOTING - CHAPTER 6

Error Messages

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.

17VIEGA 1-800-976-9819 PI-16015-03/09

MECHANICAL AND ELECTRICAL DIAGRAMS - CHAPTER 7

Pump

Pump

Pump

Pump

18VIEGA 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

19VIEGA 1-800-976-9819 PI-16015-03/09

Technical Data

TECHNICAL DATA - CHAPTER 8

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

20VIEGA 1-800-976-9819 PI-16015-03/09

NOTES

21VIEGA 1-800-976-9819 PI-16015-03/09

NOTES

22VIEGA 1-800-976-9819 PI-16015-03/09

NOTES

23VIEGA 1-800-976-9819 PI-16015-03/09

Basic Heating Control

Installation and Operation Manual

ProPress® System

Flameless copper
press technology.

ProPress® System

Flameless copper re safety

press technology.

ProPressG™ System

Flameless copper fuel gas

press technology.

PureFlow® System

The global leader
in plumbing and

heating systems.

Rely on Viega for the most complete line

of high tech/high quality plumbing, heating,

and snow melting systems…plus the most
comprehensive customer support in
the industry.

Flexible PEX tubing

plumbing technology.

ProRadiant™ Systems

Comfortable, efcient

heating technology.

S-no-Ice® System

Snow and ice

melting technology.

Viega

301 N. Main

Wichita, KS 67202

Phone: [phone]

1-800-976-9819

Fax: [phone]

www.viega.com

PI-IM-16016-03/09

Product

Instructions

3 Position Actuator for Stations

Applications

The Three Position Actuator for Stations is designed
to provide oating action control of Viega Mixing
Stations, Enhanced Mixing Stations and diverting
valves. The actuator is used in electronic temperature
control systems which use hot and/or cold water as
the controlled medium in radiant heating systems,
snowmelting, or other temperature mixing applications.
The actuator is designed for operation by any 24V
oating signal controller such as the Basic Heating

Control.

Features

• Small size allows installation where space is limited

• Maintenance free actuator in plastic housing

• Synchronous motor

• Magnetic coupling for torque limitation independent
of voltage

• Suitable for 3-position modulating control (oating)
without proportional feedback

• No tools required for mounting

stock code # 18003

Specifications

Power supply: 24 VAC, 50/60 Hz
Power consumption: 0.7 VA
Control mode: 3-position (oating)
Stroke: 0.25 inches
Running time: 150 sec at 50 Hz
120 sec at 60 Hz
(70 sec for full valve travel)
Stem force: 40 lbs
Connecting cable: 5 ft
Ambient Temp. Limits: 32 - 140°F
Weight: 0.33 lbs
Mounting thread: M30 x 1.0

301 N. Main, 9th Floor • Wichita, KS 67202 • Ph: 800-976-9819 • Fax: [phone] • www.viega.com

©2011, ProPress®, FostaPEX®, Seapress®, MegaPress®, MegaPressG

®

, Radiant Wizard®, S-no-Ice®, Snap Panel®, XL® and XL-C® are registered trademarks of Viega LLC. MiniBloc™, ProRadiant™, PolyAlloy™, SmartLoop™, GeoFusion™, and Zero Lead™ are trademarks of

BLOC
Viega LLC; GeoFusion

PI-PR-561170 0512 (3 Position Actuator for Stations)

EN0B-0471GE51-VIEGA R0412B

™

, ProPressG™ and ViegaPEX™ are trademarks of Viega GmbH & Co. KG.

Viega... The global leader in plumbing, heating and pipe joining systems

®

and Viega® are registered trademarks of Viega GmbH & Co. PureFlow®, Smart Connect®, Climate Panel®, Climate Mat®, Climate Trak®, MANA-

1 of 2

Product

Instructions

Operation

The movement of the electric actuator is produced by
the rotation of a screw spindle which is driven in both
directions by a synchronous motor through a set of
gears. A magnetic coupling limits the torque of the
gear assembly and the driving force of the actuator.
The actuator is xed to the valve body by means of
a coupling ring requiring no tools for mounting. The
actuator is maintenance free and supplied complete
with a ready-to-wire connecting cable.

Mounting

For ease of installation, make sure that the actuator is
in the open position (factory supplied) before xing the
actuator to the valve body. Thread the nut hand tight
only (do not use pliers or a wrench).

Troubleshooting

A functional check of the valve actuator can be made
by suddenly changing the heating curve adjustment.
The movement of the actuator stem indicates whether
the valve is opening or closing.

If the direction of travel is incorrect, the green and
brown wires should be exchanged.

Dimensions

Wiring Diagram

301 N. Main, 9th Floor • Wichita, KS 67202 • Ph: 800-976-9819 • Fax: [phone] • www.viega.com

©2011, ProPress®, FostaPEX®, Seapress®, MegaPress®, MegaPressG

®

, Radiant Wizard®, S-no-Ice®, Snap Panel®, XL® and XL-C® are registered trademarks of Viega LLC. MiniBloc™, ProRadiant™, PolyAlloy™, SmartLoop™, GeoFusion™, and Zero Lead™ are trademarks of

BLOC
Viega LLC; GeoFusion

PI-PR-561170 0512 (3 Position Actuator for Stations)

EN0B-0471GE51-VIEGA R0412B

™

, ProPressG™ and ViegaPEX™ are trademarks of Viega GmbH & Co. KG.

Viega... The global leader in plumbing, heating and pipe joining systems

Green wire: open valve (warmer water)
Brown wire: close valve (cooler water)
White wire: ground

®

and Viega® are registered trademarks of Viega GmbH & Co. PureFlow®, Smart Connect®, Climate Panel®, Climate Mat®, Climate Trak®, MANA-

2 of 2

Product Instructions

Zone Control

Applications

The Viega Zone Control is a wiring and
switching center for individual and / or multi­room control. The Zone Control simplies
wiring between Thermostats and Powerheads.
LED lights on housing indicate individual zone
heat demand. Available as a 4 or 6 zone, both
with priority. Zone Control includes optional
circulator activation function and built in
transformer.

Features

• LED indicator lights

• 4 or 6 Zone Control options

• Simplied wiring

• Built in transformer

Specifications

6 Zone

120 VAC
24 VAC
2 x 40 VA
7 Amp Max
16 per control
UL Approval

Control Input:
Control Output:
Transformer:
Fuse:
Powerheads:
Codes and Standards:

4 Zone

120 VAC
24 VAC
40 VA
5 Amp Max
8 per control
UL Approval

Operation

The green LED indicates that the control is
powered on. When any thermostat calls for
heat that corresponding yellow LED light
is illuminated. A call for heat energizes the
corresponding powerhead(s) and the end
switch relays illuminating the red LED light.

Viega... The global leader in plumbing and heating systems.

301 N. Main, 9th Floor • Wichita, KS 67202 • Ph: 877-843-4262 • Fax: [phone] • E-Mail: [e-mail] • www.viega.com

Stock

Code

18060

18062

Description Width Height Depth

4 Zone with

priority

6 Zone with

priority

10.75" 6.75" 2.75"

11.75" 7.5" 3"

PI-PR-18060 (Zone Control) xxxxxx 0209 Plant ID No.9300-2856 Rev

1 of 2

Product Instructions

INDIRECT
WATER HEATER
AQUASTAT
OR THERMOSTAT

24 VAC

FACTORY

INSTALLED

TRANSFORMER

120 VAC

INPUT

WHITE

BLACK

POWER IN

24 VAC

FACTORY

INSTALLED

TRANSFORMER

120 VAC

INPUT

WHITE

BLACK

Zone Control

Wiring Thermostats

Connect the "R" terminal of the thermostat 1.
to the "R" terminal of the Zone Control. "R"
supplies power to the thermostat.
Connect the "W" terminal of the thermostat to 2.
the "W" terminal of the Zone Control. "W" is
the switching signal.
Connect the "C" terminal of the thermostat to 3.
the "C" terminal of the Zone Control. "C" is
common.

(See diagram to right)

Digital Thermostat

C C R W

Wiring Powerheads

Connect the black wire of the powerhead to 1.
the "Y1" terminal of the Zone Control.
Connect the white wire of the powerhead to 2.
the "Y2" terminal of the Zone Control.
Connect a jumper from the "R1" terminal to 3.
"R2" terminal of the Zone Control.

(See diagram to right)

Priority Operation

Switching the DIP switch to Priority "ON" will
cause all other zones to stop operation until the
prioritized zone is satised. When Priority is "OFF"
all zones work independently.

Warning

Wiring connections must be made in accordance
with all applicable electrical codes. Use copper
wire only with a minimum temperature rating of
60/75°C. Failure to follow this instruction can
result in personal injury or death and / or property
damage. 12 - 18 gauge wire recommended for 120
VAC connections, 14 - 22 gauge wire for 24 VAC
connections.

R W C

Y1 Y2 R1 R2

MAIN

END

SWITCH

T

BOILER

T

4 & 6 Zone Control

Powerheads

EXTRA

N/OCOM N/C

END

SWITCH

120 VAC

SYSTEM CIRCULATOR

DHW CIRCULATOR

NEUTRAL

HOT

301 N. Main, 9th Floor • Wichita, KS 67202 • Ph: 877-843-4262 • Fax: [phone] • E-Mail: [e-mail] • www.viega.com

Viega... The global leader in plumbing and heating systems.

PI-PR-18060 (Zone Control) xxxxxx 0209 Plant ID No.9300-2856 Rev

2 of 2

Application

T200 Series

T200 series thermostats provide temperatur e control
on a variety of heating, cooling and single stage heat
pump applications.

The large LCD window displays room temperature
including degree increments indicated by a series of
dashes. The system heat output cycles on a 1 or 2F
degree field selectable differential. The cool output
differential is fixed at 2F degrees. The setpoint is
displayed and changed by pressing one of the setpoin t
buttons up or down. Installation is simplified by having
all of the field wires mounted to the separate wall pla te.

This is a powered thermostat, which must receive
75 mA of power at all times.

T200 Series

Digital, On/Off Thermostat

General Instructions

Features

• LCD window display

• Jumper selectable 5 minute time delay for heating

and cooling applications

• Mechanical contact for 40

(optional)

°

F limit freeze protection

Printed in U.S.A. 5/10 © Copyright 2010 Schneider Electric All Rights Reserved. F-27027-5

SPECIFICATIONS
Inputs

Outputs

Environment

Table-1 Model Chart.

Power Input: 20 to 32 Vac, 75 mA to 1.2 amps.

Electrical:

Battery, Setpoint backup (Energizer 357 or equivalent).

Mechanical:

Operating Differential, Heating 1 or 2F degrees (0.6 or 1.1C degrees), Cooling 2F

degrees (1.1C degrees).

Setpoint Adjustment Range, 50 to 86° F (10 to 30°C).
Material, Rigid vinyl.
Finish, Off-white.

Temperature limits:

Shipping & Storage, -40 to 125°F (-40 to 52°C).

Operating, 40 to 125°F (5 to 53°C).
Humidity: 95% non-condensing.
Shipping Weight: 0.4 lbs (170 g).
Location: NEMA Type 1.

Model Control Outputs

T201 Heating Only None Heat/Off None No No

T201-FP

T205-FP

T207-FP

a On T20X-FP (freeze protection) models a relay will provide power to a valve or relay if the thermostat fails.

a

T204 Cooling Only On/Auto Cool/Off None No No
T205 Cooling & Heating On/Auto Cool/Off/Heat Manual No No

a

T207 Cooling & Heating On/Auto Cool/Off/Heat Manual No Yes

a

Heating Only None Heat/Off None Yes No

Cooling & Heating On/Auto Cool/Off/Heat Manual Yes No

Cooling & Heating On/Auto Cool/Off/Heat Manual Yes Yes

Fan

Control

System

Switch

Changeover Mechanical Contact

B & O

Terminals

2 © Copyright 2010 Schneider Electric All Rights Reserved. F-27027-5

TYPICAL APPLICATION (wiring diagram)

Figure-1 Terminal Identification.

DISPLAY

HEATING OPERATING

DIFFERENTIAL

HEAT CONTROL

COOL CONTROL

AUTO

FAN

CONTROL

HC

TH

RH
RC

W

Y
G
B
O

Table-2 Field Selectable Jumper Options.

Feature Jumpered Not Jumpered

1. Display Celsius Fahrenheit

2. Heating operation differential 2 degrees 1 degree

3. Heat control No delay 5 minute delay

4. Cool control* No delay 5 minute delay

* T201, heat only model, only has jumper options 1 thru 3. A fourth jumper location exists but is non-functional in heat only models.

F-27027-5 © Copyright 2010 Schneider Electric All Rights Reserved. 3

RH

Figure-2 T201 Typical Wiring to Heating System With Single Transformer.

24 V AC

TRANSFORMER

24 V AC

120 V AC

FAN

RELAY

COOLING

RELAY

RC

Y

G

Optional 250 Ohm 5 watt resistor is needed
only if power drops below 75 milliamps.

1

1

1

Figure-3 Typical T204 Wiring to Cooling System With Single Transformer.

Figure-4 Typical T205 Wiring to Heating/Cooling System With Single Transformer.

W

24 VAC

1

HEATING

RELAY

24 VAC

TRANSFORMER

120 VAC

1

Optional 250W 5 watt resistor is needed
only if power drops below 75 milliamps.

FACTORY
INSTALLED
JUMPER

RH

RC

W

G

24 VAC HEATING

1

TRANSFORMER

24 VAC

Y

HEATING

RELAY

COOLING

RELAY

FAN

RELAY

120 VAC

1

If one of the secondary sides
of both transformers are grounded,
grounded sides must be connected
together.

4 © Copyright 2010 Schneider Electric All Rights Reserved. F-27027-5

INSTALLATION

24 VAC HEATING
TRANSFORMER

24 VAC

120 VAC

24 VAC COOLING

TRANSFORMER

120 VAC

FAN

RELAY

COOLING

RELAY

RC

RH

Y

W

G

HEATING

RELAY

1

11If one of the secondary sides

of both transformers are grounded,
grounded sides must be connected
together.

FAC TORY
INSTALLED
JUMPER

Figure-5 Typical T205 Wiring to Heating/Cooling System With Dual Transformer.

24 VAC HEATING

TRANSFORMER

24 VAC

120 VAC

FAN

RELAY

COOLING

RELAY

RC

RH

Y

W

G

B

O

HEATING

RELAY

REVERSING

VALVE

1

1

Either the B or O output
will be connected to the
reversing valve. Terminal
O supplies 24V on a call
for cooling. Terminal B
supplies 24V on a call for
heat.

FACTORY
INSTALLED
JUMPER

Figure-6 Typical T207 Wiring To Heating/Cooling System With Single

Transformer & Reversing Valve.

Inspection

F-27027-5 © Copyright 2010 Schneider Electric All Rights Reserved. 5

Inspect the package for damage. If damaged, notify the appropriate carrier immediately.
If undamaged, open the package and inspect the device for obvious damage.
Return damaged products.

Requirements

• Tools (not provided)

— Writer’s Note: Need list.

• Training: Installer must be a qualified, experienced technician

• Other accessories as appropria te

Precautions

]

W A R N I N G

]

C A U T I O N

N O T E

N O T E

]

W A R N I N G

General

• Electrical shock hazard! Disconnect power before installation to prevent electrical shock

or equipment damage.

• Make all connections in accordance with the electrical wiring diagram and in accordance

with national and local electrical codes.

• Avoid locations where excessive moisture, corrosive fumes, explosive vapors, or vibra-

tion are present.

• Avoid electrical noise interference. Do not install near large conductors, electrical

machinery, or welding equipment.

Federal Communications Commission (FCC)

This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reason­able protection against harmful interference in residential installations. This equipment gen­erates, uses, and can radiate radio frequency energy and may cause harmful interference if
not installed and used in accordance with the instructions. Even when instructions are fol­lowed, there is no guarantee that interference will not occur in a particular installation. If this
equipment causes harmful interference to radio and television reception—which can be
determined by turning the equipment off and on—the user is encouraged to try to correct the
interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment to an outlet on a circuit different from that to which the receiver

is connected.

• Consult the dealer or an experienced radio/television technician for help.

Canadian Department of Communications (DOC)

This class B digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.

Cet appareil numerique de la classe B respecte toutes les exigences du Reglement sur le
material broilleur du Canada.

European Standard EN 55022

This is a class B (European Classification) product. In a domestic environment this product
may cause radio interference in which case the user may be required to take adequate mea­sures.

6 © Copyright 2010 Schneider Electric All Rights Reserved. F-27027-5

Mounting

N O T E

Wiring

Mount the T200 series to a suitable surface. The T200 is shipped with an adapter plate
(4-1/4 x 4-3/4 in.) that covers the mounting blemishes of a previous thermostat. New
installation will not need the adapter plate. Do not mount on a surface that exceeds 125°F
(52°C).

• The T200 series is a powered thermostat which must receive 75 mA of power at all times.

• Some systems may require a 250 ohm, 5 watt resistor (includ ed) to be installed across

the "W" and "C" terminals of the furnace or boiler control board (Figure-2) to assure
proper current draw for the thermostat. Install the resistor if the thermostat setpoint
cannot be adjusted, if the heating relay cycles too often (1-15 seconds), or if the heating
relay will not cycle.

• The T200 serie s cannot operate with a millivolt automatic self-powered gas heating

system unless an isolation relay and a separate 24 Vac transformer are used. Install an
isolation relay if the ignition blower runs continuously or if the furnace will not shut off
when the thermostat reaches the set temperature. Another symptom is that the furnace
may not turn on.

T201

The T201 models are a heat only model with a "HEAT/OFF" system switch and no fan
control. Applications include hydronic and radiant floor heating systems as well as gas and
electric forced air heating systems. Refer to Figure-2.

T204

The T204 model is a cool only model with a "COOL/OFF" system switch and a "FAN
ON/AUTO" fan switch. Applications include direct expansion cooling only systems. Refer to
Figure-3.

T205

The T205 models are heat/cool models with manual changeover. The unit consists of a
"COOL/OFF/HEAT" system switch and a "FAN/ON/AUTO" fan switch. Applications include
hydronic heating and radiant floor heating systems as well as gas and electric forced air
heating with conventional air conditioning systems. Refer to Figure-4 and Figure-5.

T207

The T207 models are heat/cool models with manual changeover and B (powered on heat
demand) and O (powered on cool demand) terminals. The unit consists of a
"COOL/OFF/HEAT" system switch and a "FAN ON/AUTO" fan switch. Applications include
all of the T205 applications plus single stage heat pumps and forced air zoning systems that
require B and O outputs. Refer to Figure-6.

For field selectable jumper options see Table-2.
For jumper and terminal locations see Figure-1.

Auto Fan Control (HC/TH)

A three-pin jumper (Figure-1) is set to enable the HC or TH mode.
The HC mode is used in electric heat applications to energize the fan relay at the same time

the heating relay is energized. The TH mode is used in fossil fuel applications where the
furnace, not the thermostat, controls the fan directly. In this application, a call for heat only
energizes the heating relay.

F-27027-5 © Copyright 2010 Schneider Electric All Rights Reserved. 7

Optional Freeze Protection

When the T200 thermostat is ordered with the FP option a limit switch is wired in parallel with
the terminals R and W. This will provide power to a heating valve or relay if the thermostat
fails. This provides freeze protection to 40
source.

°

F (4°C) as long as heat is available from the heat

On October 1st, 2009, TAC bec am e t h e Buildings bus iness of its parent c om pany Schneider Electric . This document re flects the visual identity of Schneider Electric,
however there remains references to T AC as a corporate brand in the body copy. As each document is updated, the body copy will be cha nged to r e flect ap propriate

g

CHECKOUT

7272

3-1/4

(81)

1-7/16

(36)

4-3/4

(121)

2-1/2

(64)

4-1/4
(108)

SYSTEM

SWITCH

FAN

SWITCH

Figure-7 T200 Series Dimensions.

MAINTENANCE

1. Verify jumper pin selections.

2. Verify that the T200 is wired correctly to your heating and or cooling loads.

3. Confirm that 75 milliamps are available at all times. To measure the current draw
connect an ammeter (set to measure milliamps) in series with the heat or cool output.
If power value is below 75 milliamps install a 250 ohm 5 watt resistor in parallel across
the switched load. Recheck for 75 milliamps. The T200 thermostats must have 75
milliamps to function properly.

4. Verify system Heat/Cool/Fan outputs:
Heating — Connect a voltmeter in parallel across the heat output terminal, W, and
common of the power source.
Cooling — Connect a voltmeter in parallel across the cooling output terminal, Y, and
common of the power source.
Fan — Connect a voltmeter in parallel across the fan terminal, G, and common of the
power source.

5. The display will show the current room temperature as a number. Up to five dashes will
appear under the number. Each dash represents 1/5 of a degree. The thermostats
ON/OFF switching is based on whole degrees.

The T200 series requires no maintenance. Replace defective modules.
Regular maintenance of the total system is recomended to assure sustained, optimum

performance.

FIELD REPAIR

DIMENSIONAL DATA

Replace battery with Energizer 357 or equivalent as needed. Replace any damaged or failed
components with functional replacements.

corporate brand chan

Copyright 2010, Schneider Electric
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.

F-27027-5

es.

Schneider Electric

1354 Clifford Avenue
P.O. Box 2940
Loves Park, IL 61132-2940

www.schneider-electric.com/buildings

TechData

2.36 in

Powerhead for Brass Manifolds

The Powerhead 18028 is a two position actuator for
zone control which mounts on the return valve of the
manifold. A 24V signal actuates the head to open the
valve. The position of the valve is normally closed. The
Powerhead may be used on all Brass 1" Viega heating
manifolds. These powerheads are not compatible with
Viega’s 1-1/4" Stainless Steel Manifolds.

Features

• Grey cap allows for easy distinction between the

brass powerhead and the Stainless Powerhead with
the white cap.

• Three indicator windows allow the position of the

valve to be veried (valve is open when red bar is
visible in window).

• Compact design provides additional clearance

for installation.

• 48 in. cable length allows most connections to be

made without additional wiring.

Dimensions

Specifications

Operating Voltage: 24 V

Current Consumption: Short increase to max. 2A
when unit is cut in. Constant current during operation
approx. 0.125 A at 24 V (3 VA).

Cable length: 48 in.

Transformer Capacity Required: Up to 8 Powerheads
on a 40 VA transformer up to 15 Powerheads on a 75

VA transformer

This document subject to updates. For the most current Viega technical literature please visit www.viega.us.

Click Services -> Click Electronic Literature Downloads -> Select Product Line -> Select Desired Document

.

1.54 in.

Viega LLC, 100 N. Broadway, 6th Floor • Wichita, KS 67202 • Ph: 800-976-9819 • Fax: [phone]

TD-PR 0412 (Powerhead for Brass Manifolds)

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