Argo thermostat wiring diagrams
for HVAC systems
Argo thermostat wiring schematics
For people who prefer to see an actual wiring schematic or diagram when wiring up a room thermostat, those illustrations are provided here to help understand what wires are being connected and what each wire is doing.
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Argo AR61 Triple Aquastat Switching Relay Thermostat Connections & Wiring Diagrams

This wiring diagram illustrates the Argo AR61 triple switching aquastat equipped to connect with three thermostats.
Unlike the remaining wiring diagrams in this article series, the AR61 is a controller, not a thermostat.
In our page top photo you can see the three thermostat terminal connection pairs.
This controller can control multiple circulator relays and is also used with tankless coil boilers and cold-start boilers - options reflected in the wiring diagrams, below left.
[Click any image or thermostat wiring schematic to see an enlarged, detailed version]
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Continue reading at THERMOSTAT INSTALLATION STEPS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.
Or see these
Thermostat Wiring & Installation Articles
- THERMOSTAT INSTALLATION STEPS - how to replace or install a new thermostat
- THERMOSTAT WIRING COLOR CODES & methods for identifying which thermostat wire is which if yours have lost their labels or have unclear color codes.
- THERMOSTAT WIRE CONNECTIONS detailed room thermostat installation & wiring guide for each heating or cooling system type and each thermostat brand / model
- COMMON WIRE at THERMOSTATS
- CONVERT LINE to LOW VOLTAGE THERMOSTAT
- THERMOSTAT WIRE CONNECTIONS - 2-WIRE like the T87F
- THERMOSTAT WIRE CONNECTIONS - 3-WIRE Red, White, Blue Wires
- THERMOSTAT WIRE CONNECTIONS - 4-WIRE Red, Yellow, Green, White
- THERMOSTAT WIRE CONNECTIONS - 5-WIRE Blue/Black, Red, White, Yellow, Green
- THERMOSTAT WIRE CONNECTIONS - 6-WIRE Red, White, Blue, Yellow, Green, Orange Wires
- THERMOSTAT WIRE CONNECTIONS - 8-WIRE Black, Red, White, Yellow, Green, Orange, Brown, Blue
- THERMOSTAT WIRE SORTING to ID R W B
- THERMOSTAT WIRING OPENING SEAL
- THERMOSTAT WIRING in PARALLEL / MULTIPLES
- THERMOSTAT WIRE TERMINAL ID CODES / FUNCTIONS - what are the R, W, and other thermostat wire terminals used for?
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Citations & References
In addition to any citations in the article above, a full list is available on request.
- [8] "Automatic Oil Burner Controls - Thermostats", Domestic and Commercial Oil Burners, 3rd Ed., Charles H. Burkhardt, McGraw Hill, 1969 (and later editions), ASIN B0000EG4Y8
- [10] Domestic Central Heating Wiring Systems and Controls, 2d Ed., Raymond Ward, Newnes, ISBN-10: 0750664363, ISBN-13: 978-0750664363, Quoting from Amazon.com:
This unique A-Z guide to central heating wiring systems provides a comprehensive reference manual for hundreds of items of heating and control equipment, making it an indispensable handbook for electricians and installers across the country. The book provides comprehensive coverage of wiring and technical specifications, and now includes increased coverage of combination boilers, recently developed control features and SEDBUK (Seasonal Efficiency of Domestic Boilers in the UK) boilers ratings, where known.
In addition to providing concise details of nearly 500 different boilers fuelled by electric, gas, oil and solid fuel, and over 400 programmers and time switches, this invaluable resource also features numerous easy-to-understand wiring diagrams with notes on all definitive systems. Brief component descriptions are provided, along with updated contact and website details for most major manufacturers.
- In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested
CONTINUE READING or RECOMMENDED ARTICLES.
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