tekmar 356 User Manual

- Data Brochure

D 356

Mixing Control 356

09/08

The Mixing Control 356 is designed to control the supply water temperature to a hydronic system in order to provide outdoor reset or setpoint operation. The control uses a variable speed injection pump to regulate the supply water temperature, while protecting the boiler against ﬂue gas condensation. The control has a Liquid Crystal Display (LCD) to view system status and operating information.

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

Press & Hold

Item,

to view settings

, to test

Press & Release

Item + + , to adjust menu tektra 911-02

MIX

• Boiler Control for improved energy savings

• Test sequence to ensure proper component operation

• CSA C US certiﬁed (approved to applicable UL standards)

Power:

24 V

Var. Pmp: Relay:

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

H1193C

Output

Variable Speed

Injection Pump

(through back

of control)

Input

Supply Sensor

Included

Input

Outdoor Sensor

Included

Terminal Unit

Return Supply

Item

Mixing Control 356

Variable Speed

Do not apply power

1234

Inst/Adv

Com

Sup

Out

Input

Boiler Sensor

Included

Made in Canada

Signal wiring

must be rated

Boil

at least 300 V

10 30 50 70 90

% Out

Mixing

Demand

C US

Date Code

56789

Boiler

Power

R+

Output

Boiler

C-

Input

24 V (ac)

Power Supply

Input

Mixing Demand

Signal

Note:

Mix demand must have an electrical closure between terminals 7 and 9 before the mix injection pump is able to operate and the boiler is able to ﬁre.

How To Use The Data Brochure

This brochure is organized into four main sections. They are: 1)

Troubleshooting

of the

Sequence of Operation

that apply to your installation. For quick installation and setup of the control, refer to the followed by the

The

Control Settings

by the control. The control functions of each adjustable item are described in the

Sequence of Operation

. The

, as this contains important information on the overall operation of the control. Then read the sub-sections

Quick Setup

section (starting at

section.

section has three sub-sections. We recommend reading Section A:

DIP Switch Setting

) of this brochure, describes the various items that are adjusted and displayed

Sequence of Operation

Table of Contents

User Interface .................................................... Pg 2

Description of Display Elements ..................... Pg 3

Sequence of Operation ..................................... Pg 3

Section A: General Operation ..............

Section B: Mixing ..................................

Section C: Boiler Operation .................

Installation ......................................................... Pg 8

Pg 3

Pg 4

Pg 7

Quick Setup ..................................................... Pg 11

Control Settings .............................................. Pg 12

View Menu ...........................................

Adjust Menu ........................................

Testing and Troubleshooting ......................... Pg 14

Error Messages ..................................

Technical Data ................................................. Pg 16

Installation

, 2)

Installation

section,

Control Settings

, 3)

General Operation

DIP Switch Setting

Pg 12

Pg 15

, and 4)

section,

DIP Switch Setting .......................................... Pg 10

Reference Material: Essay E 003 “Characterized Heating Curve and Reset Ratio”

Essay E 021 “Mixing Methods and Sizing of Variable Speed Injection Pumps”

Limited Warranty ............................................. Pg 16

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 ( 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 ﬁeld of the display. To view the next available item, press and release the have reached the last available item, pressing and releasing the the display to the ﬁrst item.

Adjust

To make an adjustment to a setting in the control, press and hold simultaneously for 1 second, all 3 buttons. The display will then show the word ADJUST in the top right corner. Then select the desired item using the

to make the adjustment.

To exit the ADJUST menu, either select the ESC item and press the or button, or leave the adjustment buttons alone for 20 seconds.

Item

button. Finally, use the

Item

, , ) for selecting, viewing, and adjusting settings. As you program

button. Once you

Item

button will return

and / or

button

Item

When the 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.

Item

button is pressed and held in the VIEW menu, the display scrolls through all the control adjust items in both access

Display

Item Field

Displays an abbreviated name of the selected item

OUTDR BOIL MIX

DSGN

TARGET

MAXMIN ROOM WWSD INDR

DIFF

Number Field

Displays the current value of the selected item

VIEW ADJUST

Menu Field

Displays the current menu

Terminal Unit

Status Field

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

Symbol Description

Burner

Displays when the boiler relay is turned on.

F, °C

°F, °C

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

Return

10 30 50 70 90

Supply

% Out

Item

Mixing

Demand

Buttons

Selects Menus, Items

{

and adjusts settings

Pointer

Displays the control operation as indicated by the text.

Sequence of Operation

Section A

General Operation

Page 3-4

Section B

Mixing

Page 4-6

Section C

Boiler Operation

Page 7

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.

Design Supply

Terminal Unit

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

acterized Heating Curve

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.

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. For correct sizing and piping of the variable speed injection driven circulator, refer to essay E 021. A visual indication of the current variable speed output is displayed in the LCD in the form of a horizontal bar graph.

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.

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.

Note:

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

Indoor Design

Char-

settings.

Outdoor Design

Decreasing Outdoor Temperature

Current output of

variable

speed injection pump

3010 7050 90

% Out

Mixing sensor

Boiler supply

sensor

Boiler return

sensor

Increasing Water Temperature

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 factory 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 than flashing.

Item

and buttons. The terminal unit number should now be displayed constantly in the LCD rather

Section B: Mixing

Section B1

General

Section B2

Installer

Section B3

Advanced

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 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.

Mixing Demand

pointer is displayed in the LCD. The 356

Zone Valve Motor

End Switches

C R

To control

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 TARGET TEMPERATURE (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

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 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.

Characterized Heating Curve

MIX DSGN

cold

OUTDR

DSGN

warm

Increasing Water Temperature

. The room

Increasing Water Temperature

MIX INDR

Decreasing Outdoor Temperature

ROOM

MIX INDR

Decreasing Outdoor Temperature

TERMINAL UNITS

When using a shape of the

Characterized Heating Curve

, the control requires the selection of a terminal unit. The terminal unit determines the

according to how the terminal unit delivers heat into the building space (refer to Essay E 003). 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

MIX DSGN MIX MAX

High Mass Radiant

(1)

120°F (49°C) 140°F (60°C)

Low Mass Radiant

(2)

140°F (60°C) 160°F (71°C)

Fancoil

(3)

190°F (88°C) 210°F (99°C)

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)

+ 11 hidden pages