Technical data and installation notes for Belimo's 1756 and ZONE225N-80 zone valves, including flow, pressure, temperature specs, wiring, and actuator…
This document provides technical specifications for Belimo’s Zone Valve 1756 and ZONE225N-80, including flow characteristics, pressure ratings, temperature ranges, and materials. It details suitable actuators, dimensions, and electrical specs. Installation notes and wiring diagrams are included for proper setup in hydronic systems.
The valve is designed for compact spaces and supports 2-wire control with 24 VAC or 120 VAC. It features fail-safe operation, an integrated auxiliary switch, and is rated for use in fan coil units or baseboards with variable or constant flow.
| Flow Characteristic | on/off |
|---|---|
| Size | 1” [25] |
| Body Material | forged brass |
| Body Pressure Rating | 300 psi |
| Media Temperature Range | 32°F to 212°F [0°C to 100°C] |
| Close-Off Pressure | 20 psi |
| Weight | 1.3 lb [0.6 kg] |
| Leakage Class | ANSI Class III 0.1% |
| Power Supply | 24 VAC ± 10%, 50/60 Hz |
| Power Consumption (Running) | 6.5 W |
| Transformer Sizing | 7 VA (class 2 power source) |
| Angle of Rotation | 90° |
| Ambient Temperature Range | 32°F to 104°F [0°C to 40°C] |
| Storage Temperature Range | -40°F to 176°F [-40°C to 80°C] |
| Housing Material | UL94-5VB |
| Noise Level (Motor) | <35 dB (A) |
| Weight | 0.9 lb [0.4 kg] |
| Auxiliary Switch | 1 x SPST, .4A resistive (.4A inductive) @ 24 VAC |
The valve has an on/off flow characteristic.
The body pressure rating is 300 psi.
The media temperature range is 32°F to 212°F (0°C to 100°C).
The power supply is 24 VAC ± 10%, 50/60 Hz.
The noise level is less than 35 dB (A).