Tekmar 420 Data Brochure
  1. Manuals
  2. Brands
  3. Tekmar Manuals
  4. Boiler Supplies
  5. 420
  6. Data brochure

Tekmar 420 Data Brochure

Boiler reset module
Hide thumbs
Table of Contents

Advertisement

Quick Links

- Data Brochure
Boiler Reset Module 420
1
2
Information
Application
Brochure
Brochure
Choose controls
Design your
to match
mechanical
application
applications
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
Boiler
DHW
Demand
51 52
53
54 55
/
Boil On-Off / Mod
Off / tekmar Stager
Test
3
Rough-in
Wiring
Rough-in
wiring
instructions
Setpoint
C
R
Demand
24 V (ac)
56
57
58
Output 1 VA
Menu
Item
4
Wiring
Brochure
Wiring and
installation of
specific control
• • Setpoint Operation
• • DHW Operation
• • Includes Sensors
C
DHW Valve:
DHW
24 V (ac) 8 VA
59
Powered
Boiler Reset Module 420
Meets Class B: Canadian
ICES & FCC Part 15
Made in Canada
1 of 24
5
6
Data
Brochure
Control settings
Record settings &
and sequence of
wiring details for
operation
future reference
Vlv
+
–
Com Boil Out
Mod (dc)
60
61
62 63
64
65
Do not apply power
tN4
tektra 991-01
Demands: 20 - 260 V (ac)
Relay Rating: 115 V (ac) 5 A
66
67
68
69
DHW
Primary
Pump
Pump
N
N
© 2005
D 420
06/05
Job
Record
10 A
max.
D 420 - 06/05

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 420 and is the answer not in the manual?

Questions and answers

Related Manuals for Tekmar 420

Summary of Contents for Tekmar 420

  • Page 1 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.

  • Page 2: Table Of Contents

    Do not apply power Use the Lock / Unlock DIP switch to lock and unlock the Access Boiler Reset Module 420 Menu Level of the 420 and all connected tN4 devices, including tN4 thermostats. For details, see “Access Levels” Item tektra 991-01...

  • Page 3: Access Level

    Use the tekmar Stager / Off DIP switch when a tekmar control operates an On-Off boiler or the firing rate of a staging control is be connected to the 420 in order to Modulating boiler. operate multiple boilers. A tekmar stager may include Boiler Controls 264, 265, and 268.

  • Page 4: Display And Symbols Description

    Displays when an error exists. present. COMMUNICATION BUS DEVICE OUTPUT SCALE Displays when tN4 thermostats are Displays output of the modulating boiler. connected. DHW PUMP Displays when the DHW Pump is in operation. © 2005 D 420 - 06/05 4 of 24...

  • Page 5: User Interface

    Item, Up, Down) to select settings. As you enter settings, 1. Select the appropriate menu using the Menu button. record the settings in the Job Record J 420. 2. Select the item using the Item button. 3. Use the Up or Down button to make the adjustment.

  • Page 6: Display Menus

    To clear this item, press the Up and Down buttons simultaneously while viewing this item. After the last item, the control returns to the first item in the menu. © 2005 D 420 - 06/05 6 of 24...

  • Page 7: Adjust Menu

    The time delay the control can expect between the time that the relay contact closes to fire the boiler Default = 0:10 min and when the burner actually fires. Continued on next page. 7 of 24 © 2005 D 420 - 06/05...
  • Page 8 (38.0 to 104.5°C) heat exchanger during the Occupied period. Default = 180°F Note: This item is only available when DHW Mode is (82.0°C) set 1 through 4. Continued on next page. © 2005 D 420 - 06/05 8 of 24...
  • Page 9 Default = 60°F (15.5°C) Note: This item is only available when the Schedule is not set to OFF. After the last item, the control returns to the first item in the menu. 9 of 24 © 2005 D 420 - 06/05...

  • Page 10: Miscellaneous Menu

    Displays the type number of this product. The software version is displayed when the Up button is held. After the last item, the control returns to the first item in the menu. © 2005 D 420 - 06/05 10 of 24...

  • Page 11: Testing The Control

    IF the On-Off / Modulating DIP switch is set to Modulating Access to the Test button requires the removal of the or the tekmar Stager / Off DIP switch is set to tekmar front cover and exposes hazardous voltage while the Stager: control is powered.

  • Page 12: Sequence Of Operation

    Outdoor Reset Module (thermostats, Reset Module and Expansion Modules). Each The Boiler Reset Module 420 is the system control for a tN4 device is connected to a tN4 communication bus using hydronic heating system. The 420 operates a single heat two wires.
  • Page 13 The amount of natural convection is dependant on the supply water temperature to the heating element and the room air temperature. 13 of 24 © 2005 D 420 - 06/05...

  • Page 14: Boiler Temperature Control

    • • Locate the Boiler Design setting in the Adjust menu. Boiler Temperature Control Section C The 420 is able to operate a single, hot water, on-off or menu. If the control does not presently have a requirement modulating boiler as a heat source. For proper operation of for heat, it does not show a boiler target temperature.
  • Page 15 • • Locate the Fire Delay setting in the Adjust menu. The 420 can operate a single hot-water modulating boiler. This requires the use of the Mod (dc) output on the 420. Boiler Contact Closed To operate a modulating boiler, the Boil On - Off / Mod DIP switch must be set to Mod.
  • Page 16 Example: For boilers with electronic operators, the boiler’s input A boiler’s input signal range is 2 - 9 V (dc). The 420 control signal range may not match the output signal range of has an output signal range of 0 - 10 V (dc).

  • Page 17: Tekmar Stager Operation

    Control 264, 265, or 268. The 420 uses the modulating 1. Set the 420 Off / tekmar Stager DIP switch to tekmar output to provide a 0 - 10 V (dc) signal to the external input Stager.
  • Page 18 DHW priority, the Primary control limits the amount of time for DHW priority. As the Pump outdoor air temperature becomes colder, the length of time © 2005 D 420 - 06/05 18 of 24...

  • Page 19: Dhw With Low Temperature Boilers

    UnOccupied and Sleep periods. Setpoint Modes The Setpoint Mode determines the operation of the primary Primary Pump pump. The Setpoint Mode setting is found in the Adjust menu. 19 of 24 © 2005 D 420 - 06/05...

  • Page 20: Pump Operation

    DHW Priority Override. • • There is a Setpoint Demand and the control is set to Setpoint Mode 3 or Mode 4. Primary Pump Pump © 2005 D 420 - 06/05 20 of 24...

  • Page 21: Error Messages

    Boil Minimum setting is less than 100°F (38.0°C). Locate and repair the problem as described in the Data Brochure D 070. Once the error is corrected, press any button to clear the error. 21 of 24 © 2005 D 420 - 06/05...
  • Page 22 Boiler zones have a bus number of b. If there is more than one device error, the highest priority error will be displayed. Once the error is cleared on the tN4 device, the error message will clear automatically. © 2005 D 420 - 06/05 22 of 24...

  • Page 23: Troubleshooting

    No voltage present on demand Test voltage across demand terminals terminals. using voltmeter. Control in Unoccupied and DHW Check which schedule the 420 is Unoccupied or Setpoint Unoccupied Boiler does not fire when there is a operating on. set to OFF.

  • Page 24: Warranty

    Purchaser shall indem- such Product sale and acknowledges that it has read nify and hold tekmar harmless from and against any and all and understands same. claims, liabilities and damages of any kind or nature which...

Table of Contents