The C-22G-50 is a Belimo relay unit providing four SPDT relays with visual alarms for the 22G gas monitor system. It collects gas and alarm data over the CAN bus and switches up to four independent loads — fans, dampers, BAS alarm inputs, or signal beacons — from a centralized location. All relay units wire via a daisy chain and carry a 5-year warranty.
Works with any Belimo 22G gas monitor on the CAN bus. Especially useful with CAN-bus-only monitors that need downstream relay output: 22G02-5C, 22G14-5C, 22G0214-5C, 22G15-5C6, 22G21-5C. Full 22G range: 22G02-5A, 22G02-5B, 22G02-5C, 22G14-5A, 22G14-5B, 22G14-5C, 22G0214-5A, 22G0214-5B, 22G0214-5C, 22G15-5A3, 22G15-5A5, 22G15-5B3, 22G15-5B5, 22G15-5B6, 22G15-5C6, 22G21-5C.
Multi-zone ventilation control where several fans, dampers, or alarm circuits must be switched from one centralized panel — parking structures, mechanical rooms, and refrigeration plants.
Key Features
Four dry-contact SPDT relays rated 5 A @ 125 VAC drive fans, dampers, BAS alarm inputs, or beacons — independently switched from the CAN bus network.
Wires into the 22G CAN bus network alongside monitors and communication modules; centralizes relay switching without per-monitor wiring.
On-unit visual alarms indicate active relay/alarm states for at-a-glance status at the panel.
Accepts AC or DC 24 V supply, 5 VA AC / 1.7 W DC, with auto-reset thermal PTC fuse.
Technical Specifications
| Specification | Detail |
|---|---|
| Type | Relay Unit |
| Number of Relays | 4 |
| Relay Output | SPDT, 5 A @ 125 VAC, non-inductive |
| Number of Analog Outputs | 0 |
| Communication | CAN bus |
| Nominal Voltage | AC/DC 24 V, 50/60 Hz |
| Power Consumption | 5 VA AC / 1.7 W DC |
| Cable Entry | 2 top, 2 bottom, 1 rear — 1/2" EMT |
| Cable Specification | Power: 18-20 AWG; Comm: 22-24 AWG twisted pair, shielded |
| Fuse | Thermal PTC, auto-reset |
| Max Altitude | 6,562 ft (2,000 m) |
| Enclosure Rating | NEMA 2 / IEC IP44 |
| Pollution Degree | 2 |
| Ambient Humidity | 15-90% RH continuous; 0-99% intermittent, non-condensing |
| Ambient Temperature | -4 to 104°F (-20 to 40°C) |
| Housing Material | UL94 5VA |
| Manufacturer | Belimo |
| Manufacturer Part Number | C-22G-50 |
| Warranty | 5-year factory warranty |
Documentation
Frequently Asked Questions
What is the C-22G-50 used for?
It provides four SPDT relays driven by the 22G monitor network over the CAN bus, letting you switch fans, dampers, or alarm circuits from one centralized location instead of wiring relays at each monitor.
Which monitors work with the relay unit?
Any Belimo 22G gas monitor on the CAN bus. It is particularly useful with CAN-bus-only monitors such as 22G02-5C, 22G14-5C, 22G0214-5C, which have no on-board relays.
What are the relay ratings?
Four SPDT (changeover) dry-contact relays rated 5 A at 125 VAC, non-inductive.
- Accessory Type:
- Relay Unit
- Number of Relays:
- 4
- Number of Analog Outputs:
- 0
- Communication:
- CAN bus
- Compatible With:
- Belimo 22G Gas Monitors
