tekmar 356 User Manual

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- 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

•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

Press & Hold			Power:		24 V ±10% 50/60 Hz 3 VA
Item, to view settings			Var. Pmp:120 V (ac) 2.4 A 1/6 hp
, to test			Relay:		120 V (ac) 5 A 1/6 hp
Press & Release					Meets Class B:
Item + + , to adjust menu
					Canadian ICES
tektra 911-02
					FCC Part 15
							H1193C
				VIEW
	MIX

Terminal Unit			10 30 50 70 90			Mixing
	Return	Supply	% Out			Demand

Item

Miixiing Conttroll 356

Code

Date

Inst/Adv

Variiablle Speed

Do not apply power

Made in Canada

1 2

Signal wiring

5 6 7

Com Sup

Out

Boil

must be rated

Power

Boiler

at least 300 V

R+

C-

Input

Output

Boiler Sensor

Included

Boiler

Output

Variable Speed

Injection Pump

(through back

of control)

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.

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How To Use The Data 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 section, DIP Switch Setting section, followed by the Quick Setup section.

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

User Interface ....................................................	Pg 2	Quick Setup .....................................................	Pg 11
Description of Display Elements .....................	Pg 3	Control Settings ..............................................	Pg 12
Sequence of Operation .....................................	Pg 3	View Menu ...........................................	Pg 12
Section A: General Operation ..............	Pg 3	Adjust Menu ........................................	Pg 12
Section B: Mixing ..................................	Pg 4	Testing and Troubleshooting .........................	Pg 14
Section C: Boiler Operation .................	Pg 7	Error Messages ..................................	Pg 15
Installation .........................................................	Pg 8	Technical Data .................................................	Pg 16
DIP Switch Setting ..........................................	Pg 10	Limited Warranty .............................................	Pg 16

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

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

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, , ) 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 ﬁeld 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 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 Item button. Finally, use the and / or button to make the adjustment.

Item

To exit the ADJUST menu, either select the ESC item and press the or 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.

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Display

Item Field

Displays an abbreviated name of the selected item

Status Field

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

				Number Field
				Displays the current value
				of the selected item
OUTDR DSGN		DIFF	VIEW	ADJUST	Menu Field
BOIL TARGET				°F	Menu Field
BOIL TARGET				°F	Displays the
MIX	MINMAX			°C	current menu
MIX	MINMAX			°C
ROOM WWSD
INDR

Terminal Unit		10	30 50 70 90	Mixing
Return		Supply	% Out	Demand

{Buttons

Selects Menus, Items and adjusts settings

Item

Symbol Description

	Burner	Pointer
	Burner	Displays the control operation as indicated by
	Displays when the boiler relay is turned on.	Displays the control operation as indicated by
	Displays when the boiler relay is turned on.	the text.
		the text.

°F, °C	°F, °C
°F, °C	Displays the unit of measure that all of the
	temperatures are to be displayed in the control.

Sequence of Operation

Section A	Section B	Section C
General Operation	Mixing	Boiler Operation
Page 3-4	Page 4-6	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.

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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.

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 sys-			Mixing
			sensor
tem return water temperatures. If the boiler sensor temperature is cooler			sensor

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 re-

cover. This feature can only be used if a boiler sensor is installed.

Design Supply
Terminal Unit	Temperature
Indoor Design	Temperature
Outdoor Design	Increasing Water
	Increasing Water

Decreasing Outdoor Temperature

Current output of variable

speed injection pump

10 30 50 70 90

% Out

Boiler supply

sensor

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.

Note: 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 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 Item and buttons. The terminal unit number should now be displayed constantly in the LCD rather than flashing.

Section B: Mixing

Section B1	Section B2	Section B3
General	Installer	Advanced

Section B1: General

To control

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.

C R

Zone Valve Motor

End Switches

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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 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.

	MIX DSGN
Temperature	cold
Temperature	OUTDR
Water	DSGN
	warm

Increasing	MIX INDR
Increasing

Decreasing Outdoor Temperature

		.
		p
		m
		e
		T
		l
		a
TemperatureWater		tu
	c
	A		n
			ig
		s
		e
		D
		l
		a
		rm
		o
		N
Increasing		ROOM
Increasing		MIX INDR
		MIX INDR

Decreasing Outdoor Temperature

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 (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	High Mass Radiant	Low Mass Radiant	Fancoil	Fin-tube Convector	Radiator	Baseboard
Terminal Unit	(1)	(2)	(3)	(4)	(5)	(6)
	(1)	(2)	(3)	(4)	(5)	(6)
MIX DSGN	120°F (49°C)	140°F (60°C)	190°F (88°C)	180°F (82°C)	160°F (71°C)	150°F (66°C)
MIX MAX	140°F (60°C)	160°F (71°C)	210°F (99°C)	200°F (93°C)	180°F (82°C)	170°F (77°C)

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