Tekmar 304P Installation & Operation Manual
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Tekmar 304P Installation & Operation Manual

Switching relay
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Installation & Operation Manual
Switching Relay 304P
Introduction
The Switching Relay
304 P connects up to four thermostats and operates circulators to provide heating to a zoned hydronic
heating system. Zone 1 has optional priority over zones 2 through 4 and can be used to provide heat to an indirect
domestic hot water tank. The 304P includes optional exercising to prevent circulator seizure when not in use, and optional
post purge operation of the last operating zone to maximize energy savings. The 304P provides a RoomResponse
signal to modulating-condensing boilers to optimize comfort while improving boiler efficiency.
Features
• RoomResponse
TM
signal
• Compatible with all low voltage thermostats
• Unlimited zone expansion
• Zone priority
• Priority override
• Pump exercising
• Post purge
Switching Relay 304P
Four Zones with Priority
© 2018 tekmar 304P _ D - 12/18
• LED for each zone, priority, end switch and RoomResponse
• Away signal shared between tekmar thermostats
• Four ground screws
• Top, bottom and back conduit knockouts
• Fuses protect transformers and pumps
• Two spare fuses included
• CSA approved
Power
TM
RoomResponse
Zone 1
Zone 2
Priority
Zone 3
Zone 4
304P _ D
12/18
Zoning
Replaces: 11/16
TM
H3020A
TM

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Summary of Contents for Tekmar 304P

  • Page 1 Zone 1 has optional priority over zones 2 through 4 and can be used to provide heat to an indirect domestic hot water tank. The 304P includes optional exercising to prevent circulator seizure when not in use, and optional post purge operation of the last operating zone to maximize energy savings.

  • Page 2: Table Of Contents

    Application 304P–3 ............6 Important Safety Information It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards. tekmar is not responsible for damages resulting from improper installation and/or maintenance. This is a safety-alert symbol. The safety alert symbol is shown alone or used with a signal word (DANGER, WARNING, or CAUTION), a pictorial and/or a safety message to identify hazards.

  • Page 3: Installation

    All work must be done with power to the circuit being worked on turned off. Please be aware local codes may require this control to be installed or connected by an electrician. © 2018 tekmar 304P _ D - 12/18 3 of 12...

  • Page 4: Application 304P-1

    Application 304P–1 The Switching Relay 304P operates the circulators for four heating zones when the corresponding thermostat calls for heat. The boiler is fired whenever a zone calls for heat. Mechanical - - - - - - -- - - - ----------- -- ------ ------ --------- ------------ ----------- ----------------- -- --- ---...

  • Page 5: Application 304P-2

    Application 304P–2 The Switching Relay 304P operates four heating zone circulators when the corresponding thermostat calls for heat. Zone 1 heats a domestic hot water tank. When priority is selected, zones 2 through 4 shut off when zone 1 is heating. The boiler is fired when there is a call for heat.

  • Page 6: Application 304P-3

    Two Switching Relay 304P's operate eight heating zone circulators. The two controls are connected together using an expansion bus wire. The master 304P fires the boiler when any zone calls for heat. If priority is selected, zones 2 through 8 shut off when zone 1 is calling for heat.

  • Page 7: User Interface

    This prevents building freeze up if the DHW tank aquastat fails in the closed position. Exercising DIP Switch ON: Each circulator pump is energized for 30 seconds every 72 hours. OFF: Circulator pump exercising disabled. © 2018 tekmar 304P _ D - 12/18 7 of 12...
  • Page 8 Viessmann 100-W, WB1B 0-10 V 100% Module Viessmann 200-W, B2HB and 300 CU3A Not required 0-10 V Not required 0-10 V 100% Weil-McLain ® Evergreen * Requires changes to boiler's settings © 2018 tekmar 304P _ D - 12/18 8 of 12...
  • Page 9 • Change Installer Parameter 26 "0-10V to outlet setpoint" to Modulation Source" to 4-20 mA. Disabled. • Change "Energy Management" setting "Central Heat 4-20 mA Setup, 4 mA Water Temperature" to 80°F (26.5°C). © 2018 tekmar 304P _ D - 12/18 9 of 12...
  • Page 10 • Set SIGNAL parameter to 0-10Vdc • Set SETP LO to 70°F 304P NTI Trinity LX • Set SETP HI to 180°F • Enter boiler password. • Set Parameter "Setpoint source" to 4-20mA © 2018 tekmar 304P _ D - 12/18 10 of 12...
  • Page 11 Vitocrossal 300 CU3A ---- ---------------- -- ----- ---- ----------- ----------- - – – Viessmann 304P Extension Module EA1 Plug 0-10V • Connect to the Viessmann Extension Module EA1 Plug 0-10V. © 2018 tekmar 304P _ D - 12/18 11 of 12...

  • Page 12: Technical Data

    The liability of tekmar under the Limited Warranty shall be limited to, at tekmar’s OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, DURA- sole discretion: the cost of parts and labor provided by tekmar to repair defects in BILITY OR DESCRIPTION OF THE PRODUCT, ITS NON-INFRINGEMENT OF materials and / or workmanship of the defective product;...

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