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Installation & Operation Manual
Switching Relay 301P
Introduction
The Switching Relay 301P operates a circulator to provide heating to a hydronic
heating system when the connected thermostat calls for heat. The 301P includes
optional exercising to prevent circulator seizure when not in use, and optional post
purge operation to maximize energy savings.
Switching Relay 301P
© 2018 tekmar 301P _ D - 02/18
Features
• Compatible with all low voltage thermostats
• Pump exercising
• Pump post purge
• LED for power and zone
Power
• Top, bottom and back conduit knockouts
Zone 1
• Fuse protects pump
• Spare fuse included
• 20 VA transformer
• Thermal circuit breaker protects transformer
• Hinged cover
• CSA approved
• 3-year warranty
301P _ D
02/18
Zoning
Replaces: New
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Summary of Contents for Tekmar 301P
- Page 1 Replaces: New Introduction The Switching Relay 301P operates a circulator to provide heating to a hydronic heating system when the connected thermostat calls for heat. The 301P includes optional exercising to prevent circulator seizure when not in use, and optional post purge operation to maximize energy savings.
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Page 2: Table Of Contents
Important Safety Information It is your responsibility to ensure that this thermostat 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: Radio Frequency Interference
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada. © 2018 tekmar 301P _ D - 02/18 3 of 8... -
Page 4: Installation
All work must be done with power to the circuit being worked on turned off. Please be aware local codes may require this thermostat to be installed or connected by an electrician. © 2018 tekmar 301P _ D - 02/18 4 of 8... -
Page 5: Mechanical
Mechanical The Switching Relay 301P operates a circulator when the thermostat calls for heat. The boiler is fired whenever a zone calls for heat. Legend B1 = Boiler P1 = Pump Zone T1 = Thermostat 301P Electrical Legend B1 = Boiler... -
Page 6: Sequence Of Operation
• On during pump post purge after the thermostat stops calling for heat and the Post Purge DIP switch is on. • Off when thermostat 1 not calling for heat and post purge expired. © 2018 tekmar 301P _ D - 02/18 6 of 8... -
Page 7: Technical Data
7.5 VA Fuse T5A, 250 V slow blow, spare fuse included Pump relay 230 V (ac), 5 A, 1/3 hp Boiler XX end switch 24 V (ac), 5 A © 2018 tekmar 301P _ D - 02/18 7 of 8... -
Page 8: Limited Warranty And Product Return Procedure
(24) months from the production date. The liability of tekmar under the Limited Warranty shall be limited to, at tekmar’s sole discretion: the cost of parts and labor provided by tekmar to repair defects in materials and / or workmanship of the defective product; or to the exchange of the defective product for a warranty replacement product;...
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