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Environmental & Combustion Controls
AQ475A1004
Outdoor Temperature Compensator for Boilers

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Overview
The AQ475A Aquatrol Outdoor Temperature Compensator automatically regulates boiler water temperature to provide outdoor reset. The DHW Priority option operates the boiler at the Boiler Maximum Temperature setting to heat domestic hot water and can operate or shut down the system circulator. The boiler High Limit safety function must still be provided by the boiler manufacturer's high limit.

This product is obsolete. It can be purchased while supply lasts, or you can look for a replacement in the cross-reference.
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Features

• Adjustable settings for boiler maximum temperature, boiler minimum temperature and outdoor low (design) temperature.
• Selectable Warm Weather Shut Down (WWSD) at 70 F (21 C) to prevent summer boiler operation.
• Domestic Hot Water (DHW) priority.
• Replaceable circulator relay common to other
• Supply and outdoor sensors included.
• Automatic boiler operating differential.
• Automatic system circulator exercising. Long life DC relay drive control technology.
• Troubleshooting LEDs.
• Push-to-test button.
• Full size screw terminals.
• Functional replacement for Honeywell T475A Outdoor Reset.
• Controller and W964F Aquatrol (on-off mode).
Product Specifications  Back To Top
Description The AQ475A automatically cycles the boiler to regulate heating supply water temperature using an outdoor reset curve. The AQ475A includes supply and outdoor sensors, tie-clamp, mounting bracket and wire-nuts.
Application Outdoor Temperature Compensator for Boilers
Thermostat Compatibility Contemporary Honeywell electromechanical and electronic 2-wire thermostats
User Interface (Setting, Programming) Rotating Dials and DIP Switches
Boiler (Supply) Max. Control Temperature (F) 120 F to 225 F
Boiler (Supply) Max. Control Temperature (C) 50 C to 107 C
Boiler Min. Control Temperature (F) OFF, 80 F to 180 F
Boiler Min. Control Temperature (C) OFF, 27 C to 82 C
Outdoor Low Design Control Temperature (F) -50 F to +30 F
Outdoor Low Design Control Temperature (C) -45 C to -1 C
Power Supply 120V/60Hz, 1200 VA
Heat Demand (Thermostat R-W) Input 24 Vac, 0.10 A (Dry contacts from thermostat or end switches)
DHW Demand Input 24 to 240 Vac (opto-isolated)
Boiler (T-T) Output Rating 24 to 120 Vac, 3.7 AFL/22.2 ALR max.; 240VA pilot duty, dry contacts
Boiler Pump (C1-C2) Output Rating 120 Vac, 10A; 1/3 HP (7.4 AFL, 44.4 ALR); 240 VA pilot duty powered contact
Electrical Connections Wire-clamp screw terminals
Control and Zoning Panel Temperature Rating (F) 32 F to 122 F
Control and Zoning Panel Temperature Rating (C) 0 C to 50 C
Operating Humidity Range (% RH) Less than 90% RH, non-condensing
Sensor Temperature Rating (F) -50 F to +255 F
Sensor Temperature Rating (C) -45 C to +125 C
Dimensions (in.) 6 1/4 in. high x 4 3/8 in. wide x 3 1/4 in. deep
Dimensions (mm) 159 mm high x 111 mm wide x 83 mm deep
Approvals C/US Certified, LR: 95329-1
Tradeline Value Tradeline
Replacement Parts 32002190-001 Circulator Replacement Relay
Outdoor Sensor 10 kilohm at 25 C (77 F), NTC +/- 1%, beta=3950.
Outdoor Sensor Lead Length: 42 in. (1067 mm).

Literature and other Resources Download Back To Top
Sell Sheet - (AQ475 AQ475 Aquatrol Outdoor Temperature Compensators)
Product Data - (AQ475A Aquatrol Outdoor Temperature Compensator for Boilers)
Stuffer - (AQ475 Aquatrol Outdoor Temperature Compensator - Lower Your Energy Costs)
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