Honeywell Aquastat Controller

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Honeywell Aquastat Controller

1/4 In-Line Filter

High limit, low limit and/or circulator controllers used to regulate boiler water temperature in gas- or oil-fired hydronic heating systems.

An immersion type liquid-filled sensing element actuates two snap switches.
One switch operates as a high limit control.
The other switch operates as a low limit and/or circulator control, depending on the model.
Controller may be mounted in any positioning and needs no leveling.
Separate, easy-to-read, calibrated dial and setpoint adjustments for each switch.
Differential adjustment on low limit or circulator switch on select models.
All adjustments accessible inside front cover.
Push-in terminals for quick connecting.
Single sensing element for easy installation.
Two SPST snap switches act independently at respective temperature settings.


Hazmat Information UN1294 Toluene
Application High and Low limit
Dimensions (in.) 3 7/8 in. high x 4 1/8 in. wide x 2 3/4 in. deep.
Dimensions (mm) 98 mm high x 105 mm wide x 70 mm deep.
Temperature Range (F) Maximum--150 F at switches; 265 F at sensing element
Temperature Range (C) Maximum--66 C at switches; 129 C at sensing element
Mounting Horizontal
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