nVent RAYCHEM RayStat-M2
Electronic Controller for Ice and Snow Melting
Product Overview
The nVent RAYCHEM RayStat-M2 is an electronic controller designed for economical ice and snow melting on outdoor areas and in gutters. It detects temperature and moisture to activate snow melting systems only when snow or ice is present, ensuring energy efficiency. The RayStat-M2 is suitable for controlling electric heating cables.
Product Range
- RayStat-M2: Thermostat/Controller.
- RayStat-M2-G-Sensor: Ground sensor for detecting temperature and moisture in outdoor areas.
- RayStat-M2-R-Sensor: Gutter sensor for detecting moisture, for gutters and downpipes.
- RayStat-M2-A-Sensor: Ambient temperature sensor, for wall mounting.
Technical Specifications
Controller (RayStat-M2)
| Supply Voltage | 230 V AC ±10%, 50-60 Hz |
| Output Relay (NO) | 16 A |
| On/Off Differential | 0.4 °C |
| Temperature Setting for Startup | 0/+10 °C |
| Run-on Time | 0-5 hours |
| Ambient Temperature | -10/+50 °C |
| Ambient Air Humidity | 10-95 % |
| Enclosure Rating | IP 20 / Nema 1 |
| Power Consumption | 3 VA |
| Weight | 200 g |
| Dimensions (H/W/D) | 86/52/59 mm |
Sensors
Ground Sensor (RayStat-M2-G-Sensor)
| Detection | Moisture and temperature |
| Mounting | Outdoor area |
| Enclosure Rating | IP 68 |
| Ambient Temperature | -50/+70 °C |
| Dimensions | H32, Ø60 mm |
Roof Sensor (RayStat-M2-R-Sensor)
| Detection | Moisture |
| Mounting | Gutter / Downpipe |
| Enclosure Rating | IP 68 |
| Ambient Temperature | -50/+70 °C |
| Dimensions (H/W/D) | 105/30/13 mm |
Outdoor Temperature Sensor (RayStat-M2-A-Sensor)
| Detection | Temperature |
| Mounting | Wall |
| Ambient Temperature | -50/+70 °C |
| Dimensions (H/W/D) | 86/45/35 mm |
Installation Guidelines
Important Safety Instructions: Always disconnect the power supply before installation or maintenance. Installation should only be performed by qualified electricians in accordance with local regulations.
Sensor Installation
- Ground Sensor (G-Sensor): For outdoor surfaces prone to ice and snow. Embed horizontally, flush with the surface. Protect cable with pipes. Use provided installation plate.
- Roof Sensor (R-Sensor): For gutters or downpipes on the sunny side of the building. Ensure contact elements face meltwater flow. Do not connect pink (2) and grey (1) wires. Detailed instructions are supplied with the sensor.
- Outdoor Temperature Sensor (A-Sensor): For use with R-Sensor or separately for temperature detection. Mount on the wall under eaves on the north side of the building.
Sensor Cables: Cables are typically 10m and can be extended up to 200m (G/R-Sensor) or 50m (A-Sensor) using standard installation cable. Install cables according to regulations and avoid running them parallel to power cables to prevent interference.
Controller Installation
Mount the control unit on a DIN-rail in an approved panel. Connect supply voltage to terminals 1 and 2. Ensure electrical installation complies with local regulations.
Setup and Programming
The RayStat-M2 can be configured for ice and snow melting using G-Sensors for outdoor areas or R-Sensor and A-Sensor for gutters/downpipes.
Programming Sensitivity
Follow these steps:
- Turn off power.
- Bridge terminals 8-9 and 10-11 with wires.
- Set TIME SET to maximum (constant on) and TEMP SET to maximum (10).
- Turn power on; the ON LED will flash. Factory settings are indicated by constant TEMP, MOIST, RELAY LEDs.
- Adjust sensitivity using the TIME SET knob (1=min, 5=max). LED combinations indicate the programmed sensitivity.
- Turn power off, set desired temperature (TEMP SET) and after-run time (TIME SET).
- Remove bridge wires.
- Install sensors normally.
Refer to the LED indicator table for sensitivity levels.
Wiring
| Terminal | Color Code | Wiring |
|---|---|---|
| 1, 2 | - | Supply voltage, 230 V AC 50/60 Hz |
| 5, 7 | - | Output relay, 16 A (heating cable) |
| 8, 9 | Grey/Pink (1/2) | Temperature sensor 1, G-Sensor or A-Sensor |
| 10, 11 | Yellow/White (5/6) | Moisture sensor, G-Sensor or R-Sensor |
| 13, 14 | Brown/Green (3/4) | Sensor heating, G-Sensor or R-Sensor |
Note: Pink (2) and grey (1) wires are not used with RayStat-M2-R-Sensor.
Environmental Protection
Dispose of packaging and products responsibly to protect the environment. Products marked with the recycling symbol should not be disposed of with household waste but delivered to a designated collection center.
Electrical Heat Tracing | Heat Tracing | nVent RAYCHEM
