tekmar 423 User Manual

- Data Brochure

D423

Universal Reset Module 423

08/07

1

Information

2

Application

3

Rough-in

4

Wiring

5

Data

6

Job

Brochure

Brochure

Wiring

Brochure

Brochure

Record

Choose controls

Design your

Rough-in

Wiring and

Control settings

Record settings &

to match

mechanical

wiring

installation of

and sequence of

wiring details for

application

applications

instructions

specific control

operation

future reference

Introduction

The Universal Reset Module 423 provides outdoor reset to a hydronic heating system in order to maximize comfort and efficiency. The 423 can operate two on / off boilers or two modulating boilers. The 423 can override the outdoor reset water temperature to provide Domestic Hot Water or Setpoint operations. The 423 can operate four outdoor reset water temperatures, up to three of these water temperatures can be mixing water temperatures. To operate a mixing device, a Mixing Expansion Module must be connected to the 423 for each mixing water temperature.

Features:

•tN4 Compatible

•Four tN4 Buses

•Up to One Boiler and Three Mixing Water Temperatures

•Two On-Off or Modulating Boilers

•Equal Run Time Rotation

•Powered Pump Outputs

•DHW Operation

•Optional DHW Sensor

•Setpoint Operation

Stage1/

Stage 2/

Boil Enbl

Setp Enbl

50

51

52

53

Meets Class B: Canadian

H7010A

ICES & FCC Part 15

Made in Canada

/

Boil Sens Sup / Ret

O / DHW Sensor

O / tekmar Stager

Boilers On-O / Mod

O / Rotation

Powered

Outputs

24 V (ac)

Test		8 VA	1 VA
	71	72	73	74
	DHW		24 V (ac)
	C	Vlv	C	R

	+		–		+	–	C1	tN4	C	tN4	C2	tN4	C3	tN4		DHW Com		Boil	Com	Out
	Mod1 (dc)				Mod2 (dc)		Boiler			1		2		3
	54		55		56	57	58	59	60	61	62	63	64	65		66	67	68	69	70
																Do not apply power
									Universal Reset Module 423										tN4

Menu

Item

tektra 1006-01

Demands: 20 - 260 V (ac)

Relay Rating: 115 V (ac) 5 A

10 A

75

76

77

78

79

80

81

82

max

DHW

Setpoint

DHW

Primary

Demand

Demand

Pump

N

Pump

N

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Table of Contents

Table of Contents ...........................................................	2
Display and DIP Switches ..............................................	2
Dip Switch Settings ................................................	2
Access Level ...........................................................	3
Display and Symbols Description............................	4
User Interface ........................................................	5
Display Menus ................................................................	6
View Menu ..............................................................	6
Adjust Menu ............................................................	8
Miscellaneous Menu .............................................	15
Testing the Control .......................................................	16
Sequence of Operation.................................................	18
tekmarNet®4 Communication ...............................	18

Outdoor Reset ......................................................	18
Boiler Temperature Control ..................................	21
tekmar Stager Operation ......................................	23
Boil Enable............................................................	24
Zone Load Shedding ............................................	24
Mixing Operation ..................................................	24
Domestic Hot Water Temperature Operation .......	25
DHW with Low Temperature Boilers .....................	27
Setpoint Temperature Operation...........................	28
Pump Operation....................................................	29
Pump Exercising ...................................................	29
Error Messages ............................................................	31
Warranty .......................................................................	36

Display and DIP Switches

Dip Switch Settings

Set the DIP switch settings prior to making adjustments to the control through the user interface. Setting the DIP switches determines which menu items are displayed in the user interface.

If you change a DIP switch setting while the control is powered up, the LCD display returns to the View Menu.

Lock / Unlock

Use the Lock / Unlock DIP switch to lock and unlock the Access Level of the 423 and all connected tN4 devices, including tN4 thermostats. For details, see “Access Level”.

•Once locked, the access level in all devices cannot be viewed or changed.

•To determine if the control is currently locked a small segment representing a padlock is viewed in the bottom right hand corner of the display.

•To unlock the Access Level, set the DIP switch to Unlock.

•To lock the Access Level, set the DIP switch to Lock.

/

Boil Sens Sup / Ret O / DHW Sensor O / tekmar Stager Boilers On-O / Mod O / Rotation

	Meets Class B: Canadian
H7010A	ICES & FCC Part 15
	Made in Canada
			/
			Boil Sens Sup / Ret
			O / DHW Sensor
			O / tekmar Stager
			Boilers On-O / Mod
			O / Rotation
						Powered
						Outputs
						24 V (ac)
		Test		8 VA		1 VA
			71		72	73	74
				DHW		24 V (ac)
				C	Vlv	C	R

+	–	+	–	C1	tN4	C	tN4	C2	tN4	C3	tN4	DHW Com			Boil	Com	Out
Mod1 (dc)		Mod2 (dc)		Boiler			1		2		3
54	55	56	57	58	59	60	61	62	63	64	65	66		67	68	69	70

Do not apply power

Menu

Universal Reset Module 423

tN4

Item

tektra 1006-01

Demands: 20 - 260 V (ac)

Relay Rating: 115 V (ac) 5 A

75

76

77

78

79

80

81

82

10 A

max

DHW

Setpoint

DHW

Primary

Demand

Demand

Pump

N

Pump

N

© 2007

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Boiler Sup / Ret	Off / DHW Sensor

Use the Boiler Sensor Supply / Return DIP switch to select the location of the boiler sensor.

•If the boiler sensor is located on the supply, this DIP switch should be set to Sup. The 423 is the control that determines the boiler water temperature. Set the boiler’s aquastat at least 20°F (11.0°C) higher than the Boiler Maximum setting.

•If the 423 provides a heat demand to an external boiler control, this DIP switch must be set to Ret. Install the boiler sensor on the return side of the boiler loop. The boiler’s operating temperature is controlled by its aquastat, or an external boiler reset control.

Boil On-Off / Mod

The Boil On-Off / Mod DIP switch selects whether the control operates an On-Off boiler or the firing rate of a Modulating boiler.

•If set to Boil On-Off, the control operates up to two On-Off boilers.

•If set to Mod, the control operates up to two Modulating boilers.

Off / tekmar Stager

Use the Off / tekmar Stager DIP switch when a tekmar staging control is be connected to the 423 in order to operate multiple boilers. A tekmar stager may include Boiler Controls 264, 265, and 268.

•If a tekmar Stager is installed, set to tekmar Stager. The 423 will then provide the stager with a target temperature via a 0-10 V (dc) signal. When the Off / tekmar Stager DIP switch is set to tekmar Stager, the Boiler Sensor DIP switch must be set to Sup.

•If a tekmar Stager is not installed, set to Off.

Use the Off / DHW Sensor DIP switch when a tekmar sensor is be connected to the 423 in order to operate a DHW storage tank.

•If a tekmar sensor is installed for DHW, set to DHW Sensor. When the Off / DHW Sensor DIP switch is set to DHW Sensor, a regular DHW aquastat cannot be used.

•If a tekmar sensor is not installed for DHW, set to Off.

Off / Rotation

Use the Off / Rotation DIP switch when the Equal Run Time Rotation feature is to be used. This feature changes the firing order of the boilers in order to maintain a similar amount of running time on each boiler.

•If Equal Run Time Rotation is required, set the Off / Rotation DIP switch to Rotation.

•If Equal Run Time Rotation is not required, set to Off.

Access Level

The Access Level restricts the number of Menus, Items, and Adjustments that can be accessed by the user. The Access Level setting is found in the Miscellaneous (MISC) Menu. Select the appropriate access level for the people who work with the control on a regular basis.

There are two Access Level settings:

•Installer (InS): This is the factory default setting. This access level is sufficient for the normal set up of the control.

•Advanced (Ad): All of the control settings are available to the user.

In the following menu tables, the access level the item is visible in is shown in the access column.

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Display

Menu Field

Displays the current menu

Status Field

Displays the current status of the control’s inputs, outputs and operation. Most symbols in the status field are only visible when the VIEW Menu is selected

Item Field

Displays an

abbreviated name

of the selected item

Number Field

Displays the

current value of

the selected item

Symbols Description

	PUMP	BOILER DEMAND
	Displays when the primary pump is in	Displays when a Boiler Demand is
	operation.	present.
	BURNER	MIX 1 DEMAND
	Displays when the Stage 1 or Stage 2
		Displays when a Mix 1 Demand is present.
	contacts are closed.
	LOCK	MIX 2 DEMAND
	Displays when the access levels are
		Displays when a Mix 2 Demand is present.
	locked.
	WARNING	MIX 3 DEMAND
	Displays when an error exists.	Displays when a Mix 3 Demand is present.
	COMMUNICATION BUS	DHW DEMAND
	Displays when tN4 thermostats are
		Displays when a DHW Demand is present.
	connected.
	DHW PUMP OR VALVE	SETPOINT DEMAND
	Displays when the DHW Pump or DHW
		Displays when a Setpoint Demand is present.
	Valve is in operation.
	°F, °C, %, HOURS, MINUTES	DEVICE OUTPUT SCALE
		Displays the output of the modulating boiler(s)
	Units of measurement.
		or the variable speed injection pump.

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User Interface

Use the User Interface available on the Liquid Crystal Display (LCD) to setup and monitor the operation of the system. Use the four push buttons to the left of the LCD (Menu, Item, Up, Down) to select settings. As you enter settings, record the settings in the Job Record J 423.

Menu

The menus display in the Menu Field at the top left side of the LCD. Three menus are available: View, Adjust, and Miscellaneous.

• To select a menu, press and release the Menu button.

Item

In each menu, a group of items can be selected. The abbreviated name of the selected item displays in the Item field of the LCD display.

•To view the next available item, press and release the Item button.

•To view the previous item, hold down the Item button. and press and release the Up button.

Back to View Menu

Adjusting a Setting

To adjust a setting

1.Select the appropriate menu using the Menu button.

2.Select the item using the Item button.

3.Use the Up or Down button to make the adjustment.

Default Item

•To set the default item in the View Menu, display the item for more than five seconds.

After navigating menus, the display reverts back to the default item after 60 seconds of button inactivity.

Continue

to next Item

Continue

to next Item

Continue

to next Item

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Display Menus

View Menu (1 of 2)

The View Menu items display the current operating temperatures and status information of the system.

Item Field

Range

Access

Description

-67 to 149°F

InS

OUTDOOR

SECTION B

Current outdoor air temperature as measured by the

(-55.0 to 65.0°C)

Ad

outdoor sensor.

MIX 1 SUPPLY

SECTION B

-22 to 266°F

InS

Current Mix 1 supply water temperature as measured

by the Mix 1 supply sensor.

(-30.0 to 130.0°C)

Ad

Note: This item is only available when Bus 1, 2 or

3 is set to Mix 1.

MIX 1 TARGET

SECTION B

The Mix 1 target is the temperature the control

– – –, 35 to 230°F

Ad

is currently trying to maintain at the Mix 1 supply

sensor. “– – –” is displayed when no heat is required

(– – –, 1.5 to 110.0°C)

for Mix 1 zones.

Note: This item is only available when Bus 1, 2 or

MENU

3 is set to Mix 1.

MIX 2 SUPPLY

SECTION B

-22 to 266°F

InS

Current Mix 2 supply water temperature as measured

VIEW

(-30.0 to 130.0°C)

Ad

by the Mix 2 supply sensor.

Note: This item is only available when Bus 2 is set

to Mix 2.

MIX 2 TARGET

SECTION B

The Mix 2 target is the temperature the control

– – –, 35 to 230°F

Ad

is currently trying to maintain at the Mix 2 supply

sensor. “– – –” is displayed when no heat is required

(– – –, 1.5 to 110.0°C)

for Mix 2 zones.

Note: This item is only available when Bus 2 is set

to Mix 2.

MIX 3 SUPPLY

SECTION B

-31 to 266°F

InS

Current Mix 3 supply water temperature as measured

by the Mix 3 supply sensor.

(-35.0 to 130.0°C)

Ad

Note: This item is only available when Bus 3 is set

to Mix 3.

MIX 3 TARGET

SECTION B

The Mix 3 target is the temperature the control

– – –, 35 to 230°F

Ad

is currently trying to maintain at the Mix 3 supply

sensor. “– – –” is displayed when no heat is required

(– – –, 1.5 to 110.0°C)

for Mix 3 zones.

Note: This item is only available when Bus 3 is set

to Mix 3.

Continued on next page.

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View Menu (2 of 2)

VIEW MENU

			Item Field		Range	Access	Description
							BOILER SUPPLY	SECTION B
					-31 to 266°F	InS	Current boiler supply water temperature as measured
							by the boiler sensor.
					(-35.0 to 130.0°C)	Ad
							Note: This item is only available when the Boiler
							Sensor Sup / Ret DIP switch is set to Sup.
							BOILER TARGET	SECTION C
							The boiler target is the temperature the control
					– – –, 35 to 230°F		is currently trying to maintain at the boiler supply
						Ad	sensor. “– – –” is displayed when no heat is required
					(– – –, 1.5 to 110.0°C)
							for boiler zones.
							Note: This item is only available when the Boiler
							Sensor Sup / Ret DIP switch is set to Sup.
							BOILER RETURN	SECTION E
					-31 to 266°F	InS	Current boiler return water temperature as measured
							by the boiler sensor.
					(-35.0 to 130.0°C)	Ad
							Note: This item is only available when the Boiler
							Sensor Sup / Ret DIP switch is set to Ret.
							DHW	SECTION H
					-31 to 266°F	InS	Current DHW tank temperature as measured by the
							DHW sensor.
					(-35.0 to 130.0°C)	Ad
							Note: This item is only available when the Off / DHW
							Sensor DIP Switch is set to DHW sensor.
							BOILER 1 MODULATION	SECTION C
							Current percent modulation of the Boiler 1 burner.
					0 to 100%	Ad	Note: This item is only available when the Boiler
							On-Off / Mod DIP switch is set to Mod, the Boiler
							Sensor Sup / Ret DIP switch is set to Sup, and
							Boiler 1 is set to Auto.
							BOILER 2 MODULATION	SECTION C
							Current percent modulation of the Boiler 2 burner.
					0 to 100%	Ad	Note: This item is only available when the Boiler
							On-Off / Mod DIP switch is set to Mod, the Boiler
							Sensor Sup / Ret DIP switch is set to Sup and Boiler 2
							is set to Auto.
							BOILER 1
							The total running time of Boiler 1 since this item was
						InS	last cleared. To clear this item, press the Up and Down
					0 to 999 hr		buttons simultaneously while viewing this item.
						Ad
							Note: This item is only available when the Boiler
							Sensor Sup / Ret DIP switch is set to Sup and Boiler 1
							is set to Auto.
							BOILER 2
							The total running time of Boiler 2 since this item was
						InS	last cleared. To clear this item, press the Up and Down
					0 to 999 hr		buttons simultaneously while viewing this item.
						Ad
							Note: This item is only available when the Boiler
							Sensor Sup / Ret DIP switch is set to Sup and Boiler 2
							is set to Auto.

After the last item, the control returns to the first item in the menu.

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Adjust Menu (1 of 7)

ADJUST MENU

The Adjust Menu items are the programmable settings used to operate the mechanical equipment.

			Item Field		Range	Access	Description
					boil, M1 (Mix 1), OFF	Ad	BUS 1	SECTION C
					Default = boil		Select the water temperature for tN4 Bus 1.
					boil, M1 (Mix 1),		BUS 2	SECTION C
							Select the water temperature for tN4 Bus 2.
					M2 (Mix 2), OFF	Ad
							Note: M1 is only available if Bus 1 is set to M1
					Default = boil
							(Mix 1).
					boil, M1 (Mix 1),		BUS 3	SECTION C
							Select the water temperature for tN4 Bus 3.
					M3 (Mix 3), OFF	Ad
							Note: M1 is only available if Bus 1 is set to M1
					Default = boil
							(Mix 1).
					-60 to 45°F		OUTDOOR DESIGN	SECTION B
							The design outdoor air temperature used in the heat
					(-51.0 to 7.0°C)	InS
					Default = 10°F	Ad	loss calculations for the heating system. Typically
							set to the outdoor temperature of the coldest day
					(-12.0°C)
							of the year.
					1 HRF1		MIX 1 TERMINAL	SECTION B
					2 HRF2
							The type of heating terminal units that are being
					3 Fancoil	InS
					4 Fin-tube Convector		used in Mix 1 zones.
						Ad
					5 Radiator		Note: This item is only available when Bus 1 is set
					6 Baseboard
							to Mix 1.
					Default = 1
							MIX 1 INDOOR	SECTION B
					40 to 100°F		The design indoor air temperature used in the heat
							loss calculation for Mix 1 zones. Typically set to
					(4.5 to 38.0°C)	Ad
							70°F (21.0°C).
					Default = 70°F (21.0°C)
							Note: This item is only available when Bus 1 is set
							to Mix 1.
					70 to 220°F		MIX 1 DESIGN	SECTION B
							The supply water temperature required for the Mix 1
					(21.0 to 104.5°C)	InS
							zones on the typical coldest day of the year.
					Default = 120°F	Ad
							Note: This item is only available when Bus 1 is set
					(49.0°C)
							to Mix 1.

Continued on next page.

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Adjust Menu (2 of 7)

ADJUST MENU

			Item Field		Range	Access		Description
					OFF, 40 to 150°F		MIX 1 MINIMUM	SECTION G
							The minimum allowed Mix 1 target temperature.
					(OFF, 4.5 to 65.5°C)	Ad
							Note: This item is only available when Bus 1 is set
					Default = OFF
							to Mix 1.
					80 to 220°F, OFF		MIX 1 MAXIMUM	SECTION G
					(26.5 to 104.5°C, OFF)	Ad	The maximum allowed Mix 1 target temperature.
					Default = 140°F		Note: This item is only available when Bus 1 is set
					(60.0°C)		to Mix 1.
							MIX 1 MOTOR	SECTION G
							The time that the Mix 1 actuating motor requires to
					30 to 230 seconds	Ad	operate from fully closed to fully open.
							Note: This item is only available when Bus 1 is set
					Default = 105
							to Mix 1 and the Mixing Expansion Module is set to
							Floating Action. Availability also depends on the type
							of mixing module used.
					1 HRF1		MIX 2 TERMINAL	SECTION B
					2 HRF2
							The type of heating terminal units that are being
					3 Fancoil	InS
					4 Fin-tube Convector		used in Mix 2 zones.
						Ad
					5 Radiator		Note: This item is only available when Bus 2 is set
					6 Baseboard
							to Mix 2.
					Default = 1
							MIX 2 INDOOR	SECTION B
					40 to 100°F		The design indoor air temperature used in the heat
							loss calculation for Mix 2 zones. Typically set to
					(4.5 to 38.0°C)	Ad
							70°F (21.0°C).
					Default = 70°F (21.0°C)
							Note: This item is only available when Bus 2 is set
							to Mix 2.
					70 to 220°F		MIX 2 DESIGN	SECTION B
							The supply water temperature required for the Mix 2
					(21.0 to 104.5°C)	InS
							zones on the typical coldest day of the year.
					Default = 120°F	Ad
							Note: This item is only available when Bus 2 is set
					(49.0°C)
							to Mix 2.
					OFF, 40 to 150°F		MIX 2 MINIMUM	SECTION G
							The minimum allowed Mix 2 target temperature.
					(OFF, 4.5 to 65.5°C)	Ad
							Note: This item is only available when Bus 2 is set
					Default = OFF
							to Mix 2.
					80 to 220°F, OFF		MIX 2 MAXIMUM	SECTION G
					(26.5 to 104.5°C, OFF)	Ad	The maximum allowed Mix 2 target temperature.
					Default = 140°F		Note: This item is only available when Bus 2 is set
					(60.0°C)		to Mix 2.

Continued on next page.

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Adjust Menu (3 of 7)

ADJUST MENU

			Item Field		Range	Access		Description
							MIX 2 MOTOR	SECTION G
							The time that the Mix 2 actuating motor requires to
					30 to 230 seconds	Ad	operate from fully closed to fully open.
							Note: This item is only available when Bus 2 is set
					Default = 105
							to Mix 2, and the Mixing Expansion Module is set
							to Floating Action. Availability also depends on the
							type of mixing module used.
					1 HRF1		MIX 3 TERMINAL	SECTION B
					2 HRF2
					3 Fancoil	InS	The type of heating terminal units that are being
					4 Fin-tube Convector		used in Mix 3 zones.
						Ad
					5 Radiator		Note: This item is only available when Bus 3 is set
					6 Baseboard
							to Mix 3.
					Default = 1
							MIX 3 INDOOR	SECTION B
					40 to 100°F		The design indoor air temperature used in the heat
							loss calculation for Mix 3 zones. Typically set to
					(4.5 to 38.0°C)	Ad
							70°F (21.0°C).
					Default = 70°F (21.0°C)
							Note: This item is only available when Bus 3 is set
							to Mix 3.
					70 to 220°F		MIX 3 DESIGN	SECTION B
							The supply water temperature required for the Mix 3
					(21.0 to 104.5°C)	InS
							zones on the typical coldest day of the year.
					Default = 120°F	Ad
							Note: This item is only available when Bus 3 is set
					(49.0°C)
							to Mix 3.
					OFF, 40 to 150°F		MIX 3 MINIMUM	SECTION G
							The minimum allowed Mix 3 target temperature.
					(OFF, 4.5 to 65.5°C)	Ad
							Note: This item is only available when Bus 3 is set
					Default = OFF
							to Mix 3.
					80 to 220°F, OFF		MIX 3 MAXIMUM	SECTION G
					(26.5 to 104.5°C, OFF)	Ad	The maximum allowed Mix 3 target temperature.
					Default = 140°F		Note: This item is only available when Bus 3 is set
					(60.0°C)		to Mix 3.
							MIX 3 MOTOR	SECTION G
							The time that the Mix 3 actuating motor requires to
					30 to 230 seconds	Ad	operate from fully closed to fully open.
							Note: This item is only available when Bus 3 is set
					Default = 105
							to Mix 3, and the Mixing Expansion Module is set
							to Floating Action. Availability also depends on the
							type of mixing module used.
					Au (Auto)		BOILER 1	SECTION C
						InS	Selects Whether Boiler 1 is operational or not.
					OFF		Note: This item is only available when the Boil Sensor
						Ad
					Default = Au
							Sup / Ret DIP Switch is set to Sup, and the tekmar
							stager DIP switch is set to OFF.

Continued on next page.

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Adjust Menu (4 of 7)

ADJUST MENU

			Item Field		Range	Access	Description
					Au (Auto)		BOILER 2	SECTION C
						InS	Selects whether Boiler 2 is operational or not.
					OFF		Note: This item is only available when the Boil Sensor
						Ad
					Default = Au
							Sup / Ret DIP Switch is set to Sup, and the tekmar
							stager DIP switch is set to OFF.
					1 HRF1		BOILER TERMINAL	SECTION B
					2 HRF2
					3 Fancoil	InS	The type of heating terminal units that are being
					4 Fin-tube Convector		used in boiler zones.
						Ad
					5 Radiator		Note: This item is only available when the Boiler
					6 Baseboard
							Sensor Sup / Ret DIP switch is set to Sup.
					Default = 4
							BOILER INDOOR	SECTION B
					40 to 100°F		The design indoor air temperature used in the heat
					(4.5 to 38.0°C)	Ad	loss calculation for the boiler zones. Typically set to
					Default = 70°F		70°F (21.0°C).
					(21.0°C)		Note: This item is only available when the Boiler
							Sensor Sup / Ret DIP switch is set to Sup.
					70 to 220°F		BOILER DESIGN	SECTION B
							The supply water temperature required for boiler
					(21.0 to 104.5°C)	InS
							zones on the typical coldest day of the year.
					Default = 180°F	Ad
							Note: This item is only available when the Boiler
					(82.0°C)
							Sensor Sup / Ret DIP switch is set to Sup.
					OFF, 80 to 180°F		BOILER MINIMUM	SECTION C
							The minimum allowed boiler target temperature and
					(OFF, 26.5 to 82.0°C)	InS
					Default = 140°F	Ad	boiler return protection temperature. Check the boiler
							manufacturer’s manual for recommend supply water
					(60.0°C)
							temperatures.
					90 to 225°F, OFF		BOILER MAXIMUM	SECTION C
							The maximum allowed boiler target temperature.
					(32.0 to 107.0°C, OFF)
						Ad	Note: This item is only available when the Boiler
					Default = 200°F
							Sensor Sup / Ret DIP switch is set to Sup and the
					(93.5°C)
							tekmar stager DIP switch is set to OFF.
							BOILER DIFFERENTIAL	SECTION C
					Au (Auto), 2 to 42°F		The temperature differential that the control is to use
							to cycle the boiler On and Off.
					(Au, 1 to 23.5°C)	Ad
							Note: This item is only available when the Boiler
					Default = Au
							Sensor Sup / Ret DIP switch is set to Sup and the
							tekmar stager DIP switch is set to OFF.
							STAGE DELAY	SECTION C
					Au (Auto), 0.5 to		The minimum time delay between the operation of
							stages.
					20.0 minutes	Ad
							Note: This item is only available when the Boiler
					Default = Au
							Sensor Sup / Ret DIP switch is set to Sup and the
							tekmar stager DIP switch is set to OFF.

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D 423 - 08/07