tekmar 420 User Manual

- Data Brochure

•

Boiler Reset Module 420

D 420

08/07

Information

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Application

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instructions

Wiring

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Wiring

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Wiring and

installation of

specific control

Data

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Control settings

and sequence of

operation

Job

Record

Record settings &

wiring details for

future reference

Introduction

The Boiler Reset Module 420 provides outdoor reset to a hydronic heating system in order to maximize comfort and efficiency. The 420 can operate a single on / off boiler or a single modulating boiler. The 420 can override the outdoor reset water temperature to provide Domestic Hot Water or Setpoint operations.

Features:

• tN4 Compatible

• Boiler Outdoor Reset

• Single On-Off or Modulating Boiler

• Powered Pump Outputs

• Setpoint Operation

• DHW Operation

• Includes Sensors

C Com Boil OutVlv

PoweredOutput 1 VA

Mod (dc)

Do not apply power

66 67 68 69

DHW Primary

Pump NPump

Item

Meets Class B: Canadian ICES & FCC Part 15 Made in Canada

DHW Valve: 24 V (ac) 8 VA

Boiler Reset Module 420

Boiler DHW Setpoint C

H7006B

Demand Demand 24 V (ac) DHW

52 53 54 55 56 57 58 60 61 62 63 64

Boil On-Oﬀ / Mod Oﬀ / tekmar Stager

Test

–

tN4

tektra 991-01

Demands: 20 - 260 V (ac) Relay Rating: 115 V (ac) 5 A

10 A max.

Table of Contents

•

Boil On-Oﬀ / Mod Oﬀ / tekmar Stager

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 ............................................................7

Miscellaneous Menu .............................................10

Testing the Control .......................................................10

Sequence of Operation ................................................. 12

tekmarNet

4 Communication ...............................12

Outdoor Reset ......................................................12

Boiler Temperature Control .................................. 14

tekmar Stager Operation ...................................... 17

Zone Load Shedding ............................................ 17

Domestic Hot Water Temperature Operation ....... 17

DHW with Low Temperature Boilers ..................... 19

Setpoint Temperature Operation ........................... 19

Pump Operation ....................................................20

Pump Exercising ...................................................20

Error Messages ............................................................ 21

Troubleshooting ............................................................23

Warranty ....................................................................... 24

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 420 and all connected tN4 devices, including tN4 thermostats. For details, see “Access Levels”

• 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.

C Com Boil OutVlv

DHW Valve: 24 V (ac) 8 VA

PoweredOutput 1 VA

Boiler Reset Module 420

Mod (dc)

66 67 68 69

DHW Primary

Pump NPump

Item

Meets Class B: Canadian ICES & FCC Part 15 Made in Canada

Boiler DHW Setpoint C

Demand Demand 24 V (ac) DHW

52 53 54 55 56 57 58 60 61 62 63 64

H7006B

Boil On-Oﬀ / Mod Oﬀ / tekmar Stager

Test

–

Do not apply power

tektra 991-01

Demands: 20 - 260 V (ac) Relay Rating: 115 V (ac) 5 A

tN4

10 A max.

Boil On-Off / Mod

•

tekmar Stager / Off

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 an On-Off boiler.

• If set to Mod, the control operates a Modulating boiler.

Use the tekmar Stager / Off DIP switch when a tekmar staging control is be connected to the 420 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 420 will then provide the stager with a target temperature via a 0-10 V (dc) signal. When the tekmar Stager / Off 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.

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.

Display

Symbols Description S

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

Symbols Description

PUMP

Displays when the primary or mixing pump is in operation.

Item Field

Displays an abbreviated name of the selected item

Number Field

Displays the current value of the selected item

°F, °C, %, HOURS, MINUTES

Units of measurement.

BURNER

Displays when the burner contact is closed.

LOCK

Displays when the access levels are locked.

WARNING

Displays when an error exists.

COMMUNICATION BUS

Displays when tN4 thermostats are connected.

DHW PUMP

Displays when the DHW Pump is in operation.

BOILER DEMAND

Displays when a boiler demand is present.

DHW DEMAND

Displays when a DHW demand is present.

SETPOINT DEMAND

Displays when a Setpoint demand is present.

DEVICE OUTPUT SCALE

Displays output of the modulating boiler.

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 420.

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.

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.

Back to View Menu

Continue to next Item

Display Menus

View Menu (1 of 1)

Item Field Range Access Description

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

VIEW MENU

-76 to 149°F

(-60.0 to 65.0°C)

-22 to 266°F

(-30.0 to 130.0°C)

– – –, 35 to 230°F

(– – –, 1.5 to 110.0°C)

InS

OUTDOOR SECTION B

Current outdoor air temperature as measured by the outdoor sensor.

BOILER SUPPLY SECTION C

Current boiler supply water temperature as measured by the boiler sensor.

BOILER TARGET SECTION C

The boiler target is the temperature the control is currently trying to maintain at the boiler supply sensor. “– – –” is displayed when no heat is required for boiler zones.

0-100% Ad

0 to 9999 hr

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

InS

BOILER MODULATION SECTION C

Current percent modulation of the boiler’s burner. Note: This item is only available when the Boiler

On-Off / Mod DIP switch is set to Mod.

BOILER RUN TIME

The total running time of the boiler since this item was last cleared. To clear this item, press the Up and Down buttons simultaneously while viewing this item.

Adjust Menu (1 of 3)

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

Item Field

Range

-60 to 45°F

(-51.0 to 7.0°C)

Default = 10°F

(-12.0°C)

1 HRF1 2 HRF2 3 Fancoil 4 Fin-tube Convector 5 Radiator 6 Baseboard

Default = 4

40 to 100°F

(4.5 to 38.0°C)

Default = 70°F

(21.0°C)

70 to 220°F

(21.0 to 104.5°C)

Default = 180°F

(82.0°C)

Access Description

OUTDOOR DESIGN

InS

The design outdoor air temperature used in the heat loss calculations for the heating system. Typically set to the temperature of the coldest day of the year.

BOILER TERMINAL SECTION B

The type of heating terminal units that are being used in boiler zones.

BOILER INDOOR SECTION B

The design indoor air temperature used in the heat loss calculation for the boiler zones. Typically set to 70°F (21.0°C).

BOILER DESIGN SECTION B

The supply water temperature required for boiler zones on the typical coldest day of the year.

SECTION B

ADJUST MENU

Continued on next page.

OFF, 80 to 180°F

(OFF, 26.5 to 82.0°C)

Default = 140°F

(60.0°C)

120 to 225°F, OFF

(49.0 to 107.0°C, OFF)

Default = 200°F

(93.5°C)

0:00 to 3:00 min

Default = 0:10 min

BOILER MINIMUM

InS

The minimum allowed boiler target temperature and boiler return protection temperature. Check the boiler manufacturer’s manual for recommend supply water temperatures.

BOILER MAXIMUM

The maximum allowed boiler target temperature.

FIRE DELAY SECTION C

The time delay the control can expect between the time that the relay contact closes to fire the boiler and when the burner actually fires.

SECTION C

Adjust Menu (2 of 3)

Item Field

Range

Au, 2 to 42°F

(Au, 1 to 23.5°C)

Default = Au

10 to 230 seconds

Default = 30 seconds

0 to 50%

Default = 0%

50 to 100%

Default = 100%

Access Description

BOILER DIFFERENTIAL SECTION C

The temperature differential that the control is to use when it is operating the boiler.

BOILER MOTOR SECTION C

The amount of time required for the modulating actuating motor to fully open the gas valve or operate the fan speed from a stopped position to full speed on a modulating boiler.

Note: This item is only available when the Boiler On-Off / Mod DIP switch is set to Mod and the tekmar Stager DIP switch is set to OFF.

MINIMUM MODULATION SECTION C

The minimum percent modulation of the burner. Note: This item is only available when the Boiler

On-Off / Mod DIP switch is set to Mod and the tekmar Stager DIP switch is set to OFF.

MAXIMUM MODULATION SECTION C

The maximum percent modulation of the burner. Note: This item is only available when the Boiler

On-Off / Mod DIP switch is set to Mod and the tekmar Stager DIP switch is set to OFF.

ADJUST MENU

Continued on next page.

Au, 5 to 30 min

Default = Au

OFF, Mb1, Mb2, Mb3,

Mb4

Default = OFF

OFF,

1 (parallel, no priority) 2 (parallel, priority) 3 (pri-sec, no priority) 4 (Pri-sec, priority)

Default = 1

InS

CYCLE LENGTH

The cycle length to which all tN4 devices will synchronize.

SCHEDULE

Selects which network setback schedule the control will follow.

DHW MODE

Selects the DHW mode of operation. This determines the operation of the primary pump in combination with the DHW pump and whether or not DHW priority is required.

SECTION F

+ 16 hidden pages