Watts 356 Installation Instructions

Installation & Operation Manual

Mixing Control 356

The Mixing Control 356 is designed to operate a mixing pump to control the temperature in a hot water heating system using

Outdoor Temperature Reset. It can be used in applications ranging from in-floor radiant to commercial baseboard systems for boiler protection with full reset. This control regulates a single heating water temperature through Outdoor Temperature Reset.

It provides mixing by speeding up or slowing down a single permanent capacitor (standard wet rotor) circulator.

Additional functions include:

•

•

•

Quick Setup for easy installation and programming of control

User comfort adjustment to increase or decrease building space temperature

Advanced settings to fine-tune building requirements

•

•

•

Boiler Control for improved energy savings

Test sequence to ensure proper component operation

CSA C US certified (approved to applicable UL standards)

Input

Supply Sensor

Included

Input

Outdoor Sensor

Included

Input

Boiler Sensor

Included

Press & Hold:

Item , to view settings

, to test

Press & Release:

all 3 buttons, to adjust menu tektra 911-09

Power:

Var. Pmp:

Relay:

24 V ±10% 50/60 Hz 3 VA

120 V (ac) 2.4 A 1/6 hp

120 V (ac) 5 A 1/6 hp

Meets Class B:

Canadian ICES

FCC Part 15

VIEW

°F

MIX

Terminal Unit

Return Supply

10 30 50 70 90

% Out

Mixing

Demand

Item

Mixing Control 356

Variable Speed

Order #81000134

Do not apply power

1 2 3

Com Sup Out

4

Boil

Signal wiring must be rated at least 300V

5 6

Boiler

158033

7

T

8 9

Power

R+ C-

Output

Variable Speed

Injection Pump

(through back

of control)

Input

24 V (ac)

Power Supply

Output

Boiler

Input

Mixing Demand

Signal

1 of 20 © 2013 Watts Radiant

Important Safety Information

It is

the installers

responsibility to ensure that this control is safely installed according to all applicable codes and standards. Watts Radiant is not responsible for damages resulting from improper installation and/or maintenance.

To avoid serious personal injury and damage to the equipment:

•

•

•

Read Manual and all product labels BEFORE using the equipment. Do not use unless you know the safe and proper operation of this equipment.

Keep this Manual available for easy access by all users.

Replacement Manuals are available at

WattsRadiant.com

•

•

•

Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury or death.

This electronic control is not intended for use as a primary limit control. Other controls that are intended and certified as safety limits must be placed into the control circuit.

Do not attempt to service the control. There are no user serviceable parts inside the control. Attempting to do so voids warranty.

• Disconnect all power before opening the control.

Radio Frequency Interference

The installer must ensure that this control and its wiring are isolated and/or shielded from strong sources of electromagnetic noise.

Conversely, this Class B digital apparatus complies with Part 15 of the FCC Rules and meets all requirements of the Canadian

Interference-Causing Equipment Regulations. However, if this control does cause harmful interference to radio or television reception, which is determined by turning the control off and on, the user is encouraged to try to correct the interference by re-orientating or relocating the receiving antenna, relocating the receiver with respect to this control, and/or connecting the control to a different circuit from that to which the receiver is connected.

Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

Getting Ready

Check the contents of this package. If any of the contents listed are missing or damaged, please contact your wholesaler or

Watts Radiant sales representative for assistance.

Type 356 includes: One Mixing Control 356, One Outdoor Sensor 070, Two Universal Sensors 082, Installation and Operation

Manual IOM-WR-Mixing_Control_356.

Carefully read the details of the Sequence of Operation to ensure that you have chosen the proper control for your application.

How to Use the Brochure

This brochure is organized into four main sections. They are: 1) Sequence of Operation, 2) Installation, 3) Control Settings, and

4) Troubleshooting. The Sequence of Operation section has three sub-sections. We recommend reading Section A: General

Operation of the Sequence of Operation, as this contains important information on the overall operation of the control. Then read the sub-sections that apply to your installation. For quick installation and setup of the control, refer to the Installation and

DIP Switch Setting sections.

The Control Settings section (starting at DIP Switch Setting) of this brochure, describes the various items that are adjusted and displayed by the control. The control functions of each adjustable item are described in the Sequence of Operation.

Table of Contents

Application Drawings .......................................................... Pg 3

User Interface ..................................................................... Pg 5

Description of Display Elements ......................................... Pg 5

Sequence of Operation ....................................................... Pg 6

Section A: General Operation ............................................. Pg 6

Section B: Mixing ............................................................... Pg 8

Section C: Boiler Operation .............................................. Pg 10

Installation ........................................................................ Pg 10

IOM-WR-Mixing_Control_356 1330 2 of 20

Control Settings ................................................................ Pg 13

DIP Switch Setting ............................................................ Pg 14

View Menu ........................................................................ Pg 15

Adjust Menu ...................................................................... Pg 15

Testing and Troubleshooting ............................................. Pg 17

Error Messages ................................................................ Pg 18

Technical Data ................................................................. Pg 19

Limited Warranty............................................................... Pg 20

Application Drawing

120 V (ac)

Class II

Transformer

24 V (ac)

356

R1

A 356 - 1 Mechanical

Outdoor

Sensor (S2) 070

M

Z3

M

Z2

T2

M

Z1

T3 T1

Mix

Sensor

(S1) 082

P3 P1

Boiler

Sensor

(S3) 082

P2

V1

*Read the ‘Piping for Variable Speed Injection Mixing’ section in the Sequence of Operation for important details about pipe diameters and spacing.

Application Drawing

P1 = Variable Speed Injection Pump

P2 = Boiler Pump

P3 = Mixing System Pump

R1 = 24 V Coil Relay

S1 = Mix Supply Sensor 082

S2 = Outdoor Sensor 070

S3 = Boiler Supply Sensor 082

T1, ..., T3 = Thermostats

V1 = Balancing or Globe Valve

Z1, ..., Z3 = Zone Valve Motor End Switches

2.4A

Do not apply power

1 2 3 4

Com Sup Out Boil

5A

356

5 6 7 8 9

Boiler Power

T R+ C-

S1

S2

S3

P1

Zone Valve

Motor End

Switches

Z1

Z2

Z3

Boiler

A 356 - 1 Electrical

7

8

1

2

R1

6

5

4

3

P2

P3

120 V (ac)

L

N

Class II

Transformer

24 V (ac)

C

R


Application Drawing A 356 - 2 Mechanical

356

Outdoor

Sensor (S2) 070

120 V (ac)

Class II

Transformer

24 V (ac)

R2

R1

A2

M

Z3

T3

M

Z2

T2

M

Z1

T1

Mix

Sensor

(S1) 082

P3 P1 P2

P4

DHW

Tank

A1

Boiler

Sensor

(S3) 082

V1

*Read the ‘Piping for Variable Speed Injection Mixing’ section in the Sequence of Operation for important details about pipe diameters and spacing.

Application Drawing

A1 = DHW Aquastat

A2 = DHW High Limit Aquastat

P1 = Variable Speed Injection Pump

P2 = Boiler Pump

P3 = Mixing System Pump

P4 = DHW Pump

R1, R2 = 24 V Coil Relay

S1 = Mix Supply Sensor 082

S2 = Outdoor Sensor 070

S3 = Boiler Supply Sensor 082

T1, ..., T3 = Thermostats

V1 = Balancing or Globe Valve

Z1, ..., Z3 = Zone Valve Motor End

Switches

120 V (ac)

L

N

Class II

Transformer

24 V (ac)

C

R


A 356 - 2 Electrical

2.4A

Do not apply power

1 2 3 4

Com Sup Out Boil

5A

356

5 6 7 8 9

Boiler Power

T R+ C-

S1

S2

S3

P1

Zone Valve

Motor End

Switches

Z1

Z2

Z3

Boiler

7

8

1

2

R1

6

5

4

3

P2

P3

5

6

3

4

R2

8

7

2

1

A2

P4

A1

User Interface

The 356 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 356 has three push buttons (Item, Up, Down) for selecting, viewing, and adjusting settings. As you program your control, record your settings in the ADJUST menu table which is found in the second half of this brochure.

Item

---------------------------------------------------------------------------

The abbreviated name of the selected item will be displayed in the item fi 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 fi rst item.

Item

Adjust

-------------------------------------------------------------------------

To make an adjustment to a setting in the control, press and hold simultaneously for 1 second, the

Item, Up and Down 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 Up and / or Down button to make the adjustment.

Item

To exit the ADJUST menu, either select the ESC item and press the Up or Down button, or leave the adjustment buttons alone for 20 seconds. When the Item button is pressed and held in the VIEW menu, the display scrolls through all the control adjust items in both access levels.

Additional information can be gained by observing the status field and pointers of the LCD. The status field will indicate which of the control’s outputs are currently active. Most symbols in the status field are only visible when the VIEW menu is selected.

Display

Item Field

Displays an abbreviated name of the selected item

Number Field

Displays the current value of the selected item

OUTDR

BOIL

MIX

DSGN DIFF

TARGET

MIN MAX

ROOM WWSD

INDR

VIEW ADJUST

°F

°C

Menu Field

Displays the current menu

Status Field

Displays the current status of the control’s inputs, outputs and operation

Terminal Unit

Return

10 30 50 70 90

Supply % Out

{

Mixing

Demand

Buttons

Selects Menus, Items and adjusts settings

Item

Symbol Description

° F, ° C

Burner

Displays when the boiler relay is turned on.

°F, °C

Displays the unit of measure that all of the temperatures are to be displayed in the control.

Pointer

Displays the control operation as indicated by the text.


Sequence of Operation

Section A - General Operation

POWERING UP THE CONTROL

When the Mixing Control 356 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 and the LCD defaults to displaying the current outdoor air temperature.

OPERATION

The 356 uses a variable speed injection pump to control the supply water temperature to a hydronic system. The supply water temperature is based on either the current outdoor temperature, or a fixed setpoint.

Outdoor Reset

When the outdoor design (OUTDR DSGN) setting is not set to OFF, the 356 calculates a mixing supply temperature based on the current outdoor air temperature and the

Characterized Heating Curve settings.

Terminal Unit

Indoor Design

Design Supply

Outdoor Design

Setpoint Control

When the outdoor design (OUTDR DSGN) setting is set to OFF, the 356 supplies a fixed mixing supply temperature equal to the MIX TARGET setting. An outdoor sensor is not required during this mode of operation.

Decreasing Outdoor Temperature

VARIABLE SPEED INJECTION

A standard wet rotor circulator is connected to the 356 at the back of the control. The 356 increases or decreases the power output to the circulator when there is a mixing demand. The circulator speed varies to maintain the correct mixed supply water temperature at the mix sensor. A visual indication of the current variable speed output is displayed in the LCD in the form of a horizontal bar graph.

Current output of variable speed injection pump

10 30 50

% Out

70 90

PIPING FOR VARIABLE SPEED INJECTION MIXING

Variable speed injection systems require complete isolation between the boiler loop and system loop. For example, when the injection pump is turned off, there must be no heat transfer from the boiler loop to the system loop. In order to avoid this unwanted heat transfer, standard primary-secondary piping techniques are used as shown.

•

•

This piping arrangement requires that the injection piping be at least one pipe diameter smaller than the piping of the boiler and system loops.

The tees in the boiler and system loops must be closely spaced (not exceeding 4 pipe diameters) in order to prevent ghost flow when the variable speed injection pump is off and either the boiler pump or system pump is on. (refer to A )

•

•

There must be at least 6 pipe diameters of straight pipe on either side of the tees in order to prevent the momentum of water in the boiler and system loops from pushing flow through the injection loop. (refer to B )

There should be a minimum 1 foot drop to create a thermal trap in order to prevent convective heat transfer through the injection loop. (refer to C )

Boiler

Loop

(Tb)

Variable Speed

Injection Pump

Balancing

Valve

System

Loop

(Ts)

Ts

Injection Panel

S1

P1

V1

P2

S2

This panel shows a typical piping arrangement for a variable speed injection pump system.

P3

P1 = Boiler Pump

P2 = Variable Speed

Injection Pump

P3 = System Pump

S1 = Boiler Sensor

S2 = Supply Sensor

V1, V2 = Globe Valve

V2

Tb = Boiler supply temperature

Ts = System supply temperature

ΔTs = System temperature drop (Typically 20°F for convectors and 10°F for radiant floor heating)


DESIGN PROCEDURE FOR VARIABLE SPEED INJECTION MIXING

•

•

•

STEP 1

----------------------------------------------

Determine the following design values:

Boiler Supply Temperature (Tb)

System Supply Temperature (Ts)

System Flow Rate (US GPM) and System Loop Temperature

Drop (ΔTs). If one of these variables is unknown, use Equation

1 or 2 to calculate the other variable.

STEP 2

----------------------------------------------

Calculate Tb - Ts

STEP 3

----------------------------------------------

Look up the required Flow Ratio in the table below.

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

0.10

0.00

10 20 30 40 50

Tb - Ts (°F)

60 70 80 90

Δ Ts (°F)

25

20

15

10

STEP 4

----------------------------------------------

Calculate the design injection flow rate using Equation 3.

STEP 5

----------------------------------------------

Decide whether or not to include a balancing valve in the injection piping. A balancing (globe) valve allows adjustment when the injection pump is larger than needed. A balancing valve also provides the possibility of manual operation of the heating system by turning the injection pump fully on and adjusting the balancing valve to obtain the desired system supply water temperature.

STEP 6

----------------------------------------------

The injection piping size and model of pump to install can now be looked up in the table on page 16.

Equation 1

System Flow Rate

(US GPM)

=

Design Heating Load (Btu/hr)

500 x ΔTs (°F)

Equation 2

ΔTs (F°) =

Design Heating Load (Btu/hr)

500 x System Flow Rate (US GPM)

Equation 3

Design Injection Flow

Rate (US GPM)

=

System Flow Rate (US

GPM) x Flow Ratio

SEE PG.16 FOR MANUFACTURER APPROVED PUMP MODELS

BOILER PROTECTION (BOIL MIN)

The 356 is capable of providing boiler protection from cold mixing system return water temperatures. If the boiler sensor temperature is cooler than the BOIL MIN setting while the boiler is firing, the 356 reduces the output to the variable speed injection pump. This limits the amount of cool return water to the boiler, and allows the boiler temperature to recover. This feature can only be used if a boiler sensor is installed.

Mixing sensor

Boiler supply sensor or

Boiler return sensor

EXERCISING

The 356 has a built-in exercising function. If the pump has not been operated at least once every 3 days, the control turns on the output for 10 seconds. This minimizes the possibility of the pump seizing during a long period of inactivity.

The exercising function does not work if power to the control or pump is disconnected.

FACTORY DEFAULTS

The control comes preset with several factory defaults. These defaults are based on the terminal unit selection

(see section B2). To fine-tune building requirements, these defaults may be changed. If a factor y default value for a terminal unit is changed, the terminal unit number will flash when selected in the ADJUST menu.

To reload the factory defaults listed in section B2, power down the control and wait for 10 seconds. Power up the control while simultaneously holding the Item and down buttons. The terminal unit number should now be displayed constantly in the LCD rather than flashing.


Section B: Mixing Operation

SECTION B1: GENERAL

Mixing Demand

A mixing demand is required in order for the 356 to provide heat. A mixing demand is generated by connecting terminal T(7) to terminal C-(9) through a switching device. Once the switching device closes, the Mixing Demand pointer is displayed in the LCD. The 356 calculates a MIX TARGET supply temperature based on the outdoor air temperature and settings. If required, the 356 operates the boiler in order to provide heat to the variable speed injection pump.

Zone Valve Motor

End Switches

M

M

To control

C

R

Characterized Heating Curve

When used as a mixing reset control, the 356 varies the supply water temperature based on the outdoor air temperature. The control takes into account the type of terminal unit that the system is using. Since different types of terminal units transfer heat to a space using different proportions of radiation, convection and conduction, the supply water temperature must be controlled differently. Once the control is told what type of terminal unit is used, the control loads the factory defaults and varies the supply water temperature according to the type of terminal unit. This improves the control of the air temperature in the building.

Mixing Temperature Target (MIX TARGET)

When used as a mixing reset control, the MIX TARGET temperature is determined from the Characterized Heating Curve settings and outdoor air temperature. When used as a setpoint control, the installer will set the MIX TARGET temperature. The control displays the temperature that it is currently trying to maintain as the mixing supply temperature. If the control does not have a mixing demand, “---” is displayed as the MIX TARGET.

SECTION B2: INSTALLER SETTINGS

Outdoor Design (OUTDR DSGN)

The OUTDR DSGN is the outdoor air temperature that is the typical coldest temperature of the year where the building is located. This temperature is used when doing 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.

Setpoint Operation (MIX TARGET)

For setpoint operation, set the OUTDR DSGN to OFF. The MIX TARGET becomes the setpoint supply temperature that the control is to maintain. The MIX TARGET temperature is set by the installer in the ADJUST menu. An outdoor sensor is not required during this mode of operation.

Room (ROOM)

The ROOM is the desired room temperature for the mixing zones, and it provides a parallel shift of the Characterized 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.

Terminal Units

When using a Characterized Heating Curve, the control requires the selection of a terminal unit. The terminal unit determines the shape of the Characterized

Heating Curve according to how the terminal unit delivers heat into the building space. The 356 provides for selection between six different terminal unit types: two types of radiant floor heat, fancoil, fin-tube convector, radiator and baseboard.

When a terminal unit is selected, the control automatically loads the design supply temperature (MIX DSGN) and maximum supply temperature (MIX MAX). The factory defaults are listed below. To change defaults, refer to section B3. If a default has been changed, refer to section A to reload the factory defaults.

Terminal Unit High Mass Radiant

(1)

Low Mass Radiant

(2)

MIX DSGN 120°F (49°C) 140°F (60°C)

MIX MAX 140°F (60°C) 160°F (71°C)

Fancoil

(3)

190°F (88°C)

210°F (99°C)

MIX DSGN

MIX INDR cold

OUTDR

DSGN warm


Ac tu al

Te mp

.

N or m al

De sig n

ROOM

MIX INDR

Fin-tube Convector

(4)

180°F (82°C)

200°F (93°C)


Radiator

(5)

160°F (71°C)

180°F (82°C)

Baseboard

(6)

150°F (66°C)

170°F (77°C)


High Mass Radiant (1)

This type of a hydronic radiant floor is embedded in either a thick concrete or gypsum pour.

This heating system has a large thermal mass and is slow acting.

Default values: MIX DSGN = 120°F (49°C), MIX MAX = 140°F (60°C)

Low Mass Radiant (2)

This type of radiant heating system is either attached to the bottom of a wood sub-floor, suspended in the joist space, or sandwiched between the sub-floor and the surface. This type of radiant system has a relatively low thermal mass and responds faster than a high mass system.


Fancoil (3)

A fancoil terminal unit or air handling unit (AHU) consists of a hydronic heating coil and either a fan or blower. Air is forced across the coil at a constant velocity by the fan or blower, and is then delivered into the building space.


Fin-tube Convector (4)

A convector terminal unit is made up of a heating element with fins on it. This type of terminal unit relies on the natural convection of air across the heating element to deliver heated air into the space. The amount of natural convection to the space is dependant on the supply water temperature to the heating element and the room air temperature.

Default values: MIX DSGN = 180°F (82°), MIX MAX = 200°F (93°C)

Radiator (5)

A radiator terminal unit has a large heated surface that is exposed to the room. A radiator provides heat to the room through radiant heat transfer and natural convection.


Baseboard (6)

A baseboard terminal unit is similar to a radiator, but has a low profile and is installed at the base of the wall. The proportion of heat transferred by radiation from a baseboard is greater than that from a fin-tube convector.

Default values: MIX DSGN = 150°F (66°C), MIX MAX = 170°F (77°)

SECTION B3: ADVANCED SETTINGS

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 Characterized Heating Curve for the mixing zones.

Mixing 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.

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.

Mixing Characterized

Heating Curve

MIX MAX

MIX DSGN

210 °F

(99 °C)

190

(88)

170

(77)

150

(66)

130

(54)

Warm Weather Shut Down (WWSD)

When the outdoor air temperature rises above the WWSD setting, the 356 turns on the WWSD segment in the display. When the control is in Warm Weather Shut Down, the Mixing Demand pointer is displayed, if there is a demand. However, the control does not operate the heating system to satisfy this demand. If the control is in setpoint mode, the WWSD feature is not functional.

MIX INDR

ROOM

80°F

(27 °C)

WWSD

OUTDR DSGN

60

(16)

40

(5)

20

(-7)

Outdoor Air Temperature

0

(-18)

110

(43)

90

(32)

70

(21)

50

-20

(-29)

(10)


Section C: Boiler Operation

SECTION C1: GENERAL OPERATION

Boiler Operation

When the 356 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.

Boiler Minimum (BOIL MIN)

Most boilers require a minimum water temperature in order to prevent flue gas condensation. The BOIL MIN adjustment is set to the boiler manufacturer’s minimum recommended operating temperature. Only when the boiler temperature is measured by a boiler sensor can the 356 provide boiler protection. In this case, when the boiler is firing and the boiler temperature is below the BOIL MIN setting, the 356 turns on the MIN segment and reduces the heating load on the boiler by limiting the output of the variable speed injection pump. If the installed boiler is designed for low temperature operation, set the BOIL MIN adjustment to OFF.

Boiler Protection

Refer to section A for a description of boiler protection.

SECTION C2: BOILER SENSOR PLACEMENT

Boiler Sensor on the Supply (BOIL = Supply)

The boiler sensor can be located on the boiler supply if the 356 is the only control that is operating the boiler. When in the supply mode, the 356 determines the required operating temperature of the boiler using Boiler Load Reset. With Boiler Load Reset, the 356 operates the boiler at the lowest possible supply temperature that is sufficient to satisfy the requirements of the variable speed injection pump. If this mode of operation is selected, the boiler pump should operate continuously.

The boiler pump should not be operated by the boiler’s aquastat, as this may lead to improper cycling of the boiler because of inconsistent flow past the boiler supply sensor.

Boiler Sensor on the Return (BOIL = Return)

The boiler sensor should be located on the boiler return if the 356 is one of many controls that can call for boiler operation. When in the return mode, the 356 provides a boiler enable. The

356 no longer tries to control the boiler supply water temperature directly, but allows the boiler to operate at its operating aquastat setting when required. If this mode of operation is selected, the boiler pump should operate continuously.

The boiler pump should not be operated by the boiler’s aquastat, as this may lead to improper cycling of the boiler because of inconsistent flow past the boiler return sensor.

No Boiler Sensor

The 356 is capable of operating without a boiler sensor if desired. Without a boiler sensor the

356 provides a boiler enable, and is unable to provide boiler protection. This type of application is typical if the 356 is drawing heat from a heat source that already incorporates some form of boiler protection.

Boiler supply sensor


No boiler sensor

Installation

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 certified as safety limits must be placed into the control circuit.

The nonmetallic enclosure does not provide grounding between conduit connections. Use grounding type bushings and jumper wires.

Un boîtier nonmétallique n’assure pas la continuité électrique des conduits. Utiliser des manchons ou des fils de accord spécialement conçus pour la mise á la terre.


Mounting the Control

Grasp the front cover by the fingertip grips on the top and bottom of the enclosure and pull the front cover off. Remove the wiring cover screw. The mounting holes in the enclosure accept #6 screws.

The control can be mounted on a 2" x 4" duplex electrical box with a minimum depth of 1.75". Rough-in wiring is made to the electrical box using standard wiring practices. High voltage wiring connections are made inside the electrical box directly to the wires exiting the back of the control. Low voltage and sensor wiring enters the wiring chamber through the back or bottom of the enclosure depending on local electrical code requirements.

Outdoor Sensor Installation

The temperature sensor (thermistor) is built into the sensor 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 outdoor sensor is wall mounted, the wiring should enter through the back or bottom of the enclosure. Do not mount the outdoor sensor with the conduit knockout facing upwards 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 which 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 outdoor 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.

Sensor with rear entry wiring

Sensor with bottom entry wiring

•

•

•

Connect 18 AWG or similar wire to the two terminals provided in the enclosure and run the wires from the outdoor 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 terminal on the control and not to earth ground.

Follow the sensor testing instructions in this brochure and connect the wires to the control.

Replace the front cover of the sensor enclosure.

11 of 20

Sensor mounted onto 2" x 4" electrical box

Wires from outdoor sensor to control’s outdoor sensor and sensor common terminals

Sensor is built into the enclosure

© 2013 Watts Radiant

Universal Sensor Installation

These sensors are designed to mount on a pipe or in a temperature immersion well.

The Universal Sensor should be placed downstream of a pump or after an elbow or similar fitting. This is especially important if large diameter pipes are used as the thermal stratification within the pipe can result in erroneous sensor readings. Proper sensor location requires that the fluid is thoroughly mixed within the pipe before it reaches the sensor.

Strapped to Pipe

The Universal Sensor can be strapped directly to the pipe using the cable tie provided. Insulation should be placed around the sensor to reduce the effect of air currents on the sensor measurement.

Immersion Well

If a Universal Sensor is mounted onto 1" (25 mm) diameter L type copper pipe, there is approximately an 8 second delay between a sudden change in water temperature and the time the sensor measures the temperature change. This delay increases considerably when mild steel (black iron) pipe is used. In general, it is recommended that a temperature well be used for steel pipe of diameter greater than 1-1/4" (32 mm). Temperature wells are also recommended when large diameter pipes are used and fluid stratification is present.

Universal

Sensor

Sensor Well

Testing the Wiring

No wires should be connected to the control during testing.

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 from at least 0 - 300

V (ac) and at least 0 - 2,000,000 Ohms, is essential to properly test the wiring and sensors.

Test the Sensors

A good quality test meter capable of measuring up to 5,000 kΩ

(1 kΩ = 1000 Ω) is required to measure the sensor resistance. In addition to this, the actual temperature must be measured with either a good quality digital thermometer, or 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.

Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance

0

5

10

15

-20

-15

-10

-5

°F

-50

-45

-40

-35

-30

-25

°C

-46

-43

-40

-37

-34

-32

-29

-26

-23

-21

-18

-15

-12

-9

490,813

405,710

336,606

280,279

234,196

196,358

165,180

139,403

118,018

100,221

85,362

72,918

62,465

53,658

°F

20

25

30

35

40

45

50

55

60

65

70

75

80

85

°C

-7

-4

-1

2

4

7

10

13

16

18

21

24

27

29

46,218

39,913

34,558

29,996

26,099

22,763

19,900

17,436

15,311

13,474

11,883

10,501

9,299

8,250

°F

90

95

100

105

110

115

120

125

130

135

140

145

150

155

°C

32

35

38

41

43

46

49

52

54

57

60

63

66

68

7,334

6,532

5,828

5,210

4,665

4,184

3,760

3,383

3,050

2,754

2,490

2,255

2,045

1,857

°F

160

165

170

175

180

185

190

195

200

205

210

215

220

225

°C

71

74

77

79

82

85

88

91

93

96

99

102

104

107

829

763

703

648

598

553

1,689

1,538

1,403

1,281

1,172

1,073

983

903


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 across the 24 V (ac) power supply with an AC voltmeter. The reading should be between

22 and 26 V (ac).

Test the Powered Inputs

Mixing Demand

Measure the voltage between the mixing demand wire and the power wire that goes to R+ of the control. The voltmeter should read between 22 and 26 V (ac) when the mixing demand device calls for heat.

Test The Outputs

Boiler

Make sure power to the boiler circuit is off and short the boiler wires. When the boiler circuit is powered up, the boiler should fire. If the boiler does not turn on, refer to any installation or troubleshooting information supplied with the boiler. (The boiler may have a flow switch that prevents firing until the boiler loop pump is running). If the boiler operates properly, remove power from the boiler circuit.

Variable Speed Injection Pump

Short the variable speed injection pump wires and power up the pump circuit; the variable speed pump should operate at full speed. If the pump does not operate, check the wiring, and refer to any installation or troubleshooting information supplied with the pump. If the pump operates properly, remove the power from the variable speed injection pump circuit.

Electrical Connections to the Control

The installer should test to confirm that no voltage is present at any of the wires.

Powered Input Connections

24 V (ac) Power

Connect the 24 V (ac) power supply to the Power R+ and

Power C-terminals (8 and 9). This connection provides power to the microprocessor and display of the control.

24 V (ac)

T

7 8 9

Power

R+ C-

8 9

Power

R+ C-

Mixing Demand

To generate a mixing demand, terminal T(7) must be connected to terminal C-(9) through a switching device.

24 V (ac) Mixing demand switches


Output Connections

Boiler Contact

The Boiler terminals (5 and 6) are an isolated output in the 356. 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 356 requires the boiler to fire, it closes the contact between terminals 5 and 6.

T T

Variable Speed Injection Pump

The 356 can vary the speed of a permanent capacitor, impedance protected, or equivalent pump motor that has a locked rotor current of less than 2.4 A.

Most small wet rotor circulators are suitable as described in section A. The

356 has an internal overload protection circuit which is rated at 2.5 A 250 V

(ac). Contact your Watts Radiant sales representative for details on the repair procedures if this circuit is blown.

Connect one of the wires from the variable speed injection pump to one of the black wires from the back of the control. Connect the second black wire from the back to the live (L) side of the 120 V (ac) power source. The other wire on the variable speed injection pump must be connected to the neutral

(N) side of the 120 V (ac) power supply. Connect the green wire on the back of the control to ground.

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 070 to the Com and Out terminals (1 and 3). The outdoor sensor is used by the 356 to measure the outdoor air temperature.

Boiler Sensor

Connect the two wires from the Boiler Sensor 082 to the Com and Boil terminals (1 and 4). The boiler sensor is used by the 356 to measure the boiler temperature.

1

Com

2 3

Sup Out

4

Boil

Mixing Sensor

Connect the two wires from the Mixing Sensor 082 to the Com and Sup terminals (1 and 2). The mixing sensor is used by the 356 to measure the supply water temperature after the variable speed injection pump. Normally the sensor is attached to the pipe downstream of the system pump.

1 2

Com Sup

5

Boiler

6

1

Com

2 3

Sup Out

DIP Switch Setting

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.

Do not apply power

1 2 3 4

Com Sup Out Boil

Boiler supply sensor or


Mixing sensor

System pump


View

Menu (1 of 1)

OUTDR

MIX

D i s p l a y

VIEW

° F

VIEW

° F

B3

D e s c r i p t i o n

Section Advanced

Current outdoor air temperature as measured by the outdoor sensor. This is also the default display for the control.

(OUTDR DSGN

≠

OFF)

Current mixed supply water temperature as measured by the mixing sensor.

MIX

TARGET

BOIL

VIEW

° F

B1

B2

B3

VIEW

° F

Target mixed supply is the temperature the control is currently trying to maintain at the mixing sensor.

“---” is displayed when the control is not operating the mixing device.

Current boiler temperature as measured by the boiler sensor.

(Boiler sensor is present)

R a n g e

-67 to 149 ° F

(-55 to 65 ° C)

14 to 266 ° F

(-10 to 130 ° C)

---, 14 to 266 ° F

(---, -10 to 130 ° C)

14 to 266 ° F

(-10 to 130 ° C)

Adjust

Menu (1 of 2)

ROOM

D i s p l a y D e s c r i p t i o n

ADJUST

° F

B2

Section Advanced

The desired room air temperature.

(OUTDR DSGN

≠

OFF)

MIX

TARGET

ADJUST

° F

B2

Mixing setpoint temperature.

(OUTDR DSGN = OFF)

OUTDR DSGN ADJUST

° F

B2

Terminal Unit

MIX

INDR

MIX

DSGN

ADJUST

B2

ADJUST

° F

B3

ADJUST

° F

B3

R a n g e

35 to 100 ° F

(2 to 38 ° C)

OFF, 60 to 200 ° F

(OFF, 16 to 93 ° C)

The design outdoor air temperature used in the heat loss calculation for the heating system. For setpoint operation, set the OUTDR DSGN to OFF.

-60 to 32 ° F, OFF

(51 to 0 ° C, OFF)

The type of terminal units that are being used in the heating system.

(OUTDR DSGN

≠

OFF)

1 (High Mass Radiant), 2 (Low Mass

Radiant), 3 (Fancoil),

4 (Fin-tube Convector), 5 (Radiator),

6 (Baseboard)

The design indoor air temperature used in the heat loss calculation for the heating system.

(OUTDR DSGN

≠

OFF)

35 to 100 ° F

(2 to 38 ° C)

The design supply water temperature used in the heat loss calculation for the heating system.

(OUTDR DSGN

≠

OFF)

70 to 220 ° F

(21 to 104 ° C)

Actual

Setting


Adjust

Menu (2 of 2)

D i s p l a y

MIX MAX

ADJUST

° F

B3

D e s c r i p t i o n

Section Advanced

The maximum supply temperature for the mixing system.

(OUTDR DSGN

≠

OFF)

ADJUST

BOIL

C2

The location of the boiler sensor. This effects operation of the boiler contact.


Return Supply

BOIL

MIN

ADJUST

° F

C1

The minimum temperature allowed for the boiler target temperature.


ADJUST

° F

B3 The system’s warm weather shut down.

WWSD

ADJUST

° F

The units of measure that all of the temperatures are to be displayed in the control.

ADJUST

This item exits the ADJUST menu by pressing either the or button.

R a n g e

80 to 225 ° F

(27 to 107 ° C)

Return, Supply

OFF, 80 to 180 ° F

(OFF, 27 to 82 ° C)

35 to 100 ° F, OFF

(2 to 38 ° C, OFF)

° F, ° C

Actual

Setting

Manufacturer Approved Pump Models

Design Injection Flow Rate (US GPM)

Without Globe Valve With Globe Valve

Turns open of the Nominal Pipe

Globe Valve (%) Diameter (inches)

Manufacturer Approved Pump Models

Grundfos (F)

15-42

2* 3**

Taco B&G

NRF

9

NRF

22

NRF

33

Armstrong

Astro

30 50

-

2.5

4 - 5.5

4.5 - 6.5

9 - 10.5

9

1.5 - 2.0

2

3.0 - 4.5

4 - 5.5

7.5 - 8.5

8

20

100

100

100

100

100

0.5

0.5

0.5

0.75

0.75

1

14 - 15

19

22 - 24

26 - 28

35 - 37

33

12 - 13

17

19 - 21

-

31 - 32

30

100

100

100

100

100

100

1

1.25

1.25

1.5

1.5

2

41 - 45 39 - 42 100 2

* Speed 2, ** Speed 3 (Brute)

This table assumes there are 5 feet of pipe, 4 elbows, and 4 branch tees of the listed diameter.These circulators have been tested and approved by the manufacturers for use with the tekmar variable speed electronics.


Testing the Control

The Mixing Control 356 has a built-in test routine which is used to test the main control functions. The 356 continually monitors the sensors and displays an error message whenever a fault is found. See the following pages for a list of the 356’s error messages and possible causes.

Quick Test

Press and hold the up button, the Boiler relay closes and the variable speed injection pump turns on to 100% of its output speed.

Once the up button is released, the output relays return to normal operation.

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

Understand the

Sequence of

Operation

Sketch the

Piping in the

System

Document the

Control

Isolate the

Problem

Test the Contacts

Voltages

& Sensors

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 for? This information is critical in correctly diagnosing the problem.

Understand the sequence of operation of the system. If a particular zone is not receiving enough heat, which pumps 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?

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 flow directions in the system paying close attention to the location of pumps, check valves, pressure bypass valves, and mixing valves.

Ensure correct flow direction on all pumps. This is also a very useful step if additional assistance is required.

Document the control for future reference. Before making any adjustments to the control, note down 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 pumps 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 and the demand 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 to simulate closed contacts on the terminal blocks as required. Test the sensors and their wiring as described in the sensor testing section.


Error Messages

VIEW

OUTDR VIEW

OUTDR VIEW

MIX

MIX

BOIL

BOIL

VIEW

VIEW

VIEW

VIEW

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 all the settings are verified.

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 and repair the problem as described in the testing section of this brochure. To clear the error message from the control after the sensor has been repaired, press the Item button.

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 and repair the problem as described in the testing section of this brochure. To clear the error message from the control after the sensor has been repaired, press the Item button.

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 injection pump at a fixed output as long as there is a mixing demand.

Locate and repair the problem as described in the testing section of this brochure. To clear the error message from the control after the sensor has been repaired, press the Item button.

The control is no longer able to read the mixing supply sensor due to an open circuit. In this case the control will operate the injection pump at a fixed output as long as there is a mixing demand.

Locate and repair the problem as described in the testing section of this brochure. To clear the error message from the control after the sensor has been repaired, press the Item button.

The control is no longer able to read the boiler sensor due to a short circuit. If the BOIL MIN adjustment is higher than 100°F (38°C), the control closes the Boiler contact when the injection pump starts to operate. The boiler temperature is limited by the operating aquastat. If the BOIL MIN adjustment is lower than 100°F (38°C), the control does not operate the Boiler contact. Locate and repair the problem as described in the testing section of this brochure. To clear the error message from the control after the sensor has been repaired, press the Item button.

The control is no longer able to read the boiler sensor due to an open circuit. If the BOIL MIN adjustment is higher than 100°F (38°C), the control closes the Boiler contact when the injection pump starts to operate. The boiler temperature is limited by the operating aquastat. If the BOIL

MIN adjustment is lower than 100°F (38°C), the control does not operate the Boiler contact. Locate and repair the problem as described in the testing section of this brochure. If the boiler sensor is deliberately removed, the control must be powered down, and then powered back up. To clear the error message from the control after the sensor has been repaired, press the Item button.


Technical Data

Mixing Control 356 Variable Speed, includes outdoor & 2 universal sensors

Control - Microprocessor control. This is not a safety (limit) control

Packaged weight - 1.5 lb. (670 g)

Dimensions - 4-3/4” H x 2-7/8” W x 1-7/8” D (120 x 74 x 48 mm)

Enclosure

Approvals

- White PVC plastic, NEMA type 1

- CSA C US, meets class B: ICES & FCC Part 15

Ambient conditions - Indoor use only, 32 to 104°F (0 to 40°C), RH ≤90% Non-condensing

Power supply

Var. pump

Relays

Mixing demand

Sensors

-Included

- 24 V (ac) ±10%, 50/60 Hz, 3 VA

- 120 V (ac) 2.4 A, 1/6 hp

- 120 V (ac) 5 A, 1/6 hp

- 24 V (ac) 2 VA

- NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892

Outdoor Sensor 070 and 2 of Universal Sensor 082

Outdoor Sensor 070


Dimensions - 4-1/2" H x 2-7/8" W x 1-1/2" D (73 x 114 x 38 mm)

Enclosure

Approvals

- White PVC plastic, NEMA type 2

- CSA C US

Operating range

Sensor

- -58 to 140°F (-50 to 60°C)

- NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C), ß=3892

Universal Sensor 082


Dimensions - 3/8” OD x 3/4” (9.5 OD x 19 mm)

Sensor material - Brass sleeve, 8’ (2438 mm) 20 AWG, 300V PVC insulated zipcord

Approvals

Operating range

Sensor

- CSA C US

- -58 to 221°F (-50 to 105°C)

- NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C), ß=3892

Press & Hold:

Item , to view settings

, to test

Press & Release:

all 3 buttons, to adjust menu tektra 911-09

Power:

Var. Pmp:

Relay:

24 V ±10% 50/60 Hz 3 VA

120 V (ac) 2.4 A 1/6 hp

120 V (ac) 5 A 1/6 hp

Meets Class B:

Canadian ICES

FCC Part 15

VIEW

F

MIX

Terminal Unit

Return Supply

10 30 50 70 90

% Out

Mixing

Demand

Item

Mixing Control 356

Variable Speed

Order #81000134

Do not apply power

1 2 3

Com Sup Out

4

Boil

Signal wiring must be rated at least 300V

®

158033

US

5 6

Boiler

7

T

8 9

Power

R+ C-


Hydronic System Electronic Controls and Thermostats Limited Warranty

Watts Radiant (the Company) warrants its hydronic system electronic controls and thermostats (the Product) to be free from defects in materials and workmanship under normal usage for a period of one year from the documented date of installation of the Product. In the event of defects within the warranty period, the Company will replace the Product without charge. This remedy is the sole and exclusive remedy for breach of warranty. This warranty is transferable to subsequent owners.

Under this Limited Warranty, the Company will provide the following:

In order to make a claim, you must:

(a) Provide the Company with sufficient details relating to the nature of the defect, the installation, the history of operation, and any repairs that may have been made.

(b) At the Company’s discretion and at the owner’s expense, ship the Product to the Company or the Company’s local representative or distributor.

(c) Provide proof that the Product was installed in accordance with the applicable Product Installation Manual and any special written design or installation guidelines by the Company for this project.

(d) Provide proof that the Product was installed in accordance with the National Electrical Code (NEC) or the Canadian Electrical Code (CEC), and all applicable local building and electrical codes.

(e) Provide a retail sales receipt or proof of purchase.

The following are not covered by this Limited Warranty:

(a) Any incidental or consequential damage, including inconvenience, loss of time or loss of income.

(b) Any labor or materials required to repair or replace the Product that are not authorized in writing by the Company.

(c) Any labor or materials required to remove, repair or replace materials other than the Products.

(d) Any freight or delivery costs related to the Product or any related electrical products.

Watts Radiant assumes no responsibility under this Limited Warranty for any damage to the Product caused by any trades people, visitors on the job site, or damage caused as a result of post-installation work. This Limited Warranty shall be invalidated by any abuse, misuse, misapplication or improper installation of the Products.

The staff at the Company is available to answer any questions regarding the proper installation or application of the Product at this toll-free phone number: 800-276-2419

(USA/International) or 888-208-8927 (Canada). If you are ever in doubt about the correct installation procedure to follow, or if the Product appears to be damaged, you must call us before proceeding with the installation or proposed repair.

WATTS RADIANT DISCLAIMS ANY WARRANTY NOT PROVIDED HEREIN, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR IMPLIED WARRANTY

OF FITNESS FOR A PARTICULAR PURPOSE. WATTS RADIANT FURTHER DISCLAIMS ANY RESPONSIBILITY FOR SPECIAL, INDIRECT, SECONDARY, INCIDENTAL,

OR CONSEQUENTIAL DAMAGES ARISING FROM OWNERSHIP OR USE OF THIS PRODUCT, INCLUDING INCONVENIENCE OR LOSS OF USE. THERE ARE NO

WARRANTIES WHICH EXTEND BEYOND THE FACE OF THIS DOCUMENT. NO AGENT OR REPRESENTATIVE OF WATTS RADIANT HAS ANY AUTHORITY TO EXTEND

OR MODIFY THIS WARRANTY UNLESS SUCH EXTENSION OR MODIFICATION IS MADE IN WRITING BY A CORPORATE OFFICER.

Some states/provinces do not allow the exclusion or limitation of incidental or consequential damages and some states/provinces do not allow limitations on how long implied warranties may last. Therefore, the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights and you may also have other rights, which vary from state to state or province to province. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE/PROVINCIAL LAW, ANY IMPLIED WARRANTIES THAT

MAY NOT BE DISCLAIMED, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED IN DURATION

TO ONE YEAR FROM THE DATE OF MANUFACTURE.

Effective: May 1, 2013. This warranty applies to all Products purchased after this date.

A Watts Water Technologies Company

USA: Springfi eld, MO • Tel. (800) 276-2419 • Fax: (417) 864-8161 • www.wattsradiant.com

Canada: Burlington, ONT. • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca

IOM-WR-Mixing_Control_356 1330 © 2013 Watts Radiant

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