| Electrical Connections | Wire-clamp screw terminals, Maximum 2 x 14 AWG each on line voltage terminals |
| Operating Humidity | 5 to 90% RH, non-condensing |
| Application | Zoning control for hydronic zoning system |
| Dimensions | 9 1/2 in wide x 8 in. high x 3 3/8 in. deep |
| CSA | CSA C/US Certified to CSA and UL Standards, File No. LR76030 |
| Weight (lb) | 3.9 lbs |
| Weight (kg) | 1.8 kg |
| Thermostat Compatibility | AQ1000 Series 2-wire communicating thermostats and most digital thermostats |
| User Interface | DIP Switches |
| Number of Zones | 4 |
| Zoning Devices Controlled | 2-wire valve (24 Vac) |
| R-C Input (on Control and Zoning Modules) | 24 Vac Class II (input on Control and Zoning Modules) |
| B-B Communication Bus Terminals | Low voltage, Class II, 2-wire polarity-insensitive, digital communicating link to other Control or Zoning modules. |
| Zone Module Thermostat Input | Low voltage, Class II, 2-wire polarity-insensitive, digital communicating with power link to AQ1000 series thermostat. |
| Zone Output Contact Rating | 120 Vac/250 Vac, 0.5A, 12VA |
| Replacement Parts | AQ10X38 24 Vac 38 VA transformer,AQ15540B 4-zone pump expansion module |
| Temperature Ratings (F) | Panel--32 F to 130 F |
Description
The AQ25742B is a zoning panel from Resideo (Honeywell Home).
A zoning control is what lets one boiler serve rooms that do not all want heat at the same time. Each zone gets its own thermostat and its own valve or pump; the panel takes the calls, drives the valves, and starts the boiler and circulator only when something actually needs heat.
The part that matters on installation is what the panel expects from the valve. A 2-wire valve is simply driven open; a 4-wire valve has an end switch that reports back when it has finished opening, and the panel waits for that before starting the circulator. Matching the panel to the valve type is what keeps the pump from running against a closed zone.
This panel is built for 2-wire zone valves.
Size the panel to the zone count you will have, not the count you have today. Adding a zone later means replacing the panel, and the cost difference between four zones and six at the time of install is small compared with doing it twice.
- Brand: Resideo (Honeywell Home)
- Manufacturer Part #: AQ25742B/U
- Type: Zoning panel
- Category: Zone Controls