Honeywell AQ25042B Aquastat Boiler Relay Control Panel
The AQ250 family of AQUATROL Boiler Controls provides simplified, energy-efficient control of single temperature, residential hydronic heating systems. The AQ250 easily converts a single zone heating system into a room-by-room comfort control system, or upgrades a basic, relay-logic zoning system to intelligent Zone of Greatest Demand control for increased energy efficiency with reduced boiler cycling. AQ250 boiler controls can ensure ample supply of hot water for both space heating and priority generation of domestic hot water for bathing, dishes and laundry.
Features:
- Controls up to 2 stages of heat from a single thermostat.
- Use with AQ1000 2-wire communicating thermostats, or most dry contact digital thermostats.
- Zoning Control for up to 4 zones as shipped; can be expanded to a total of 16 zones with AQ255 or AQ257 expansion zoning panels and up to 64 zones when used with AQ254 Add-A-Temp panels.
- Line or low-voltage output for zoning equipment (pumps or valves).
- Zone synchronization through Zone or Greatest Demand control.
- Domestic hot water priority and priority override protection.
- Boiler short cycling protection.
- Boiler post purge.
- Freeze protection.
- Pump/valve exercise.
- Boiler shock prevention from cold water returning to boiler.
- Automated test feature for quick start-up and simplified troubleshooting.
- Integral 38 VA transformer with self-resetting electronic fuse.
Product Specifications:
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| Application |
Boiler control for zoned hydronic systems |
| Thermostat Compatibility |
AQ1000 Series 2-wire communicating thermostats and most digital thermostats |
| User Interface (Setting, Programming) |
DIP Switches |
| Number of Zones Controlled |
4 |
| Boiler Heat Post Purge |
30 seconds (sent to DHW tank or Zone of Greatest Demand - selectable) |
| Pump/Valve exercise |
30 seconds per 2 weeks of space heating inactivity |
| R-C Output (on transformer) |
38 VA, 24 Vac Class II |
| R-C Input (on Control and Zoning Modules) |
24 Vac Class II |
| Supply/Return Sensor |
Lead Length: 10 ft. (3050 mm). 10 kilohm NTC thermistor at 25 C (77 F) ±0.5F (±0.3C) up to 500 ft (150 M) using 18 AWG or larger wire |
| Heat Demand (Thermostat R-W) Input |
External dry contacts connection only |
| DHW Demand Input |
External dry contacts connection only |
| Boiler (T-T) Output Rating |
24 Vac, 0.5A, 12VA |
| 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. |
| ZR-ZC Contact Rating |
120 to 240 Vac, 1/3 HP |
| Boiler Pump Output Rating |
120 Vac/250 Vac 5A, 1/3HP |
| DHW Pump/Valve Output Rating |
120 Vac/250 Vac 5A, 1/3HP |
| Auxiliary Pump Output Rating |
Dry contact output, 120 Vac/250 Vac 5A, 1/3 HP |
| Zone Output Contact Rating |
Pumps: 120 Vac/250 Vac, 5A, 1/3 HP |
| Zone Output Contact Rating |
Valves: 24 Vac, 0.5 A, 12 VA |
| Control and Zoning Panel Temperature Rating (F) |
32 F to 130 F |
| Control and Zoning Panel Temperature Rating (C) |
0 C to 55 C |
| Operating Humidity Range (% RH) |
5 to 90% RH, non-condensing |
| Sensor Temperature Rating (F) |
-58 F to +230 F |
| Sensor Temperature Rating (C) |
-50 C to +110 C |
| Dimensions (in.) |
13 in wide x 8 in. high x 3 3/8 in deep |
| Dimensions (mm) |
33 cm wide x 20.3 cm high x 8.5 cm deep |
| Tradeline Value |
Tradeline |
| Type of Zoning Devices Controlled |
Zone pumps or 2-wire valves (line voltage) |
| Electrical Connections (Line Voltage) |
Wire-clamp screw terminals, Maximum 2 x 14 AWG each on line voltage terminals |
| Outdoor Sensor |
Lead Length: 10 ft. (3050 mm). 10 kilohm NTC thermistor at 25 C (77 F) +/- 0.5F (+/-0.3C) up to 500 ft (150 M) using 18 AWG or larger wire, beta=3892. |
| Replacement Parts |
AQ15000B boiler control module |
| Replacement Parts |
AQ15540B 4-zone pump expansion module |
| Replacement Parts |
AQ10X38 24 Vac 38 VA transformer |
| Replacement Parts |
AQ12C11 supply/return/mixed loop sensor |
| Approvals, Canadian Standards Association |
CSA C/US Certified to CSA and UL Standards, File No. LR76030 |
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