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4 Zone Expansion Panel for Pumps or Zone Valves WITHOUT End Switches

4 Zone Expansion Panel for Pumps or Zone Valves WITHOUT End Switches

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Model: Honeywell AQ25542B

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Model: Honeywell AQ25542B

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If ordered by 1PM CST M-F, ships same day. All items on your order must be in stock for same-day shipping.

The AQ255 and AQ257 family of AQUATROL Expansion Zoning panels work with AQ2000 Boiler Control Panels and AQ1000 Communicating Thermostat to control up to 4 space heating zones (or 8, for the AQ25542B Panel). Can be combined with additional expansion zoning panels and an AQ2000 control panel for a total of 16 space heating zones.


  • AQ255 for zoning with pumps or zone valves without end switches.
  • Use with 2-wire polarity insensitive communicating thermostats.
  • Allows zone synchronization through Zone of Greatest Demand control.
  • Auto test function to test zones at system start up. It allows for operator controlled testing of zones; includes pause/restart capability.
  • LED lights for easy diagnostic of zone operation.
  • Allows zoning with either "Normally Open" or "Normally Closed" zone valves.
  • Adjacent zoning panels can operate different zone equipment - one panel may control 4 pumps while another may control 4 zone valves.
  • Easily switch from zone valves to pumps with same zoning module - just flip one DIP switch. Ensure correct voltage is applied (120 Vac for pumps, 24 Vac for valves)
  • R-C transformer and B-B data bus terminal connections and network communication for easy expansion.
  • Zones can be set to energize a parallel group pump.
  • Line or low-voltage output for zoning equipment (pumps or valves) 38 VA Transformer with self resetting electronic fuse.
System Information
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Product Type
Product Dimensions
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9 1/2 Inches
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3 3/8 Inches
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8 Inches
Product Weight
2.1 lbs
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