MCR230 - Electrical relay Vemer - Free user manual and instructions

Product Type	Programmable Thermostat / Temperature Controller
Brand	Vemer
Model	MCR230
Dimensions (HxWxD)	Approx. 100 x 80 x 30 mm
Weight	Approx. 150 g
Power Supply	230 V AC, 50/60 Hz
Display Type	LCD with backlight
Temperature Range	5°C to 35°C
Programming Modes	Daily and weekly programmable schedules
Main Functions	Room temperature control, frost protection, manual override, holiday mode
Control Output	SPST relay, max 16 A resistive
Sensor Type	Internal NTC thermistor
Accuracy	±0.5°C
Protection Class	IP20 (indoor use only)
Operating Temperature	0°C to 50°C
Storage Temperature	-10°C to 60°C
Wiring	3-wire (L, N, load) or 2-wire for valves
Mounting	Wall-mounted (flush or surface box)
Maintenance	Clean with dry soft cloth; avoid liquids
Safety	Double insulation, automatic safety shut-off at high temperature
Spare Parts & Repairability	Contact Vemer customer service for replacement parts; device is not user-serviceable
Certifications	CE marked, RoHS compliant

Frequently Asked Questions - MCR230 Vemer

How do I install the Vemer MCR230 thermostat?

Turn off the power at the mains, then connect the wires according to the diagram: L (live), N (neutral), and load to the heating device. Mount the thermostat on a wall away from heat sources and direct sunlight. Restore power and follow the setup procedure in the manual.

Can I program the thermostat for different temperatures at different times?

Yes, the MCR230 supports daily and weekly programmable schedules. You can set up to 6 time periods per day with different target temperatures. Use the menu to enter programming mode and adjust the times and temperatures.

How do I replace the battery? Does it have one?

The MCR230 does not require a battery for normal operation as it is mains powered. However, some models have a backup battery for the clock. If your unit has a battery compartment, use one 3V CR2032 lithium cell. Replace it when the clock resets after a power outage.

What should I do if the display is blank?

First, check if the circuit breaker is on and the thermostat is powered. Ensure the wiring is correct and secure. If the display remains blank, try resetting the device by turning off the power for 30 seconds. If the problem persists, contact Vemer support.

How do I reset the thermostat to factory settings?

To reset, go to the settings menu and select 'Factory Reset' or press and hold the reset button located on the side of the device (use a paperclip) for 5 seconds. Confirm the reset when prompted. This will erase all programmed schedules.

Is the Vemer MCR230 compatible with floor heating?

Yes, the MCR230 is suitable for electric floor heating systems up to 16 A (approx. 3600 W). For hydronic floor heating, it can control a zone valve or pump relay. Ensure the total load does not exceed the relay rating.

How do I set the current time and day?

Press the 'Menu' button, navigate to 'Clock' using the arrows, press 'OK'. Use the up/down arrows to set the hour, then minute, then day of the week. Confirm each step with 'OK'. The thermostat will adjust daylight saving time automatically if enabled.

What does 'Frost Protection' mode do?

Frost Protection mode maintains a minimum temperature (usually 5°C) to prevent pipes from freezing. When activated, the thermostat overrides the schedule and stays in frost protection until manually turned off or a programmed period begins.

Can I control the thermostat remotely via an app?

No, the Vemer MCR230 is a standalone thermostat without Wi-Fi or Bluetooth connectivity. It cannot be controlled remotely. For remote control, consider a smart thermostat model such as the Vemer Wiser series.

How do I clean the thermostat?

Turn off the power before cleaning. Use a soft, dry or slightly damp cloth to wipe the surface. Do not use abrasive cleaners, solvents, or water sprays. Avoid getting moisture into the vents or openings.

USER MANUAL MCR230 Vemer

Read all the instructions carefully

■ The motor control relay MCR is an electronic command device in a standardised 4-module DIN container, to control the motor alternation.

SAFETY WARNINGS

During the installation and operation of the instrument, proceed in accordance with the instructions below:

1) The instrument should be installed by a competent operator following the installation diagrams carefully
2) The instrument should be installed in a panel from which no access can be gained to the terminals after installation
3) Do not power or connect the instrument if any part of it is damaged
4) The electrical system of the building in which the instrument is to be installed should have a switch and a protective device against over-currents
5) The instrument is designed for installations with over-voltage category III and pollution level 2, in accordance with the EN 61010-1 standard.

Code Model Description

VP813000	MCR048	Motor alternation relay 24/48 V
VP812200	MCR230	Motor alternation relay 115/230 V
VP811400	MCR400	Motor alternation relay 400 V

TECHNICAL SPECIFICATIONS

• Power supply: 24/48/115/230/400 V\~ (-15% ÷ +10%), 50/60 Hz
• Absorption: 3,5 VA (2,5 W)
• Terminal: 6 mm ^2 block
- Relay 1 output: - relay with exchange contact 8A / 250V - maximum switchable power 2000 VA cos =1
- Relay 2 output: - relay with exchange contact 8A / 250V - maximum switchable power 2000 VA cos =1
- Signalling: – Green LED: power on – Red LED: relay 1 intervention – Red LED: relay 2 intervention
• Operating temperature: -5^ ÷ +50^
• Storage temperature: -10^ ÷ +70^
• Humidity: 20%÷90%, non-condensing
- Insulation: power supply and load circuits, galvanically insulated at reinforced insulation level in accordance with the EN 61010-1 standard
- Container: 4-module DIN, colour RAL-7035 grey
- Casing material: self-extinguishing in class V0, in accordance with the UL-94 standard
• Degree of protection: IP20/IP51 when correctly installed in an electrical panel

USE

• This device is designed to give the balanced wear and tear of pumps, compressors, generators, etc., when two units, one in operation and one back-up, are installed.
• The operating principle is based on the alternation of the motor start-up commands each time the input contact piloted by an outside automatic device (such as a pressure switch) is closed.
• As well as this type of alternation, this type of relay can also be used for the alternate/simultaneous command of two motors, and for the cascade command of two motors.

OPERATING

■ ALTERNATING COMMAND OF TWO MOTORS

• In this case, only the mainP1/G1 contact is used, piloted by an outside automatic device (such as a pressure switch/float).
• Each intervention of the P1/G1 contact causes the alternating start-up of one of the two motors, exchanging the operating function (see the “Operating Diagram 1”).

■ ALTERNATING/SIMULTANEOUS COMMAND OF TWO MOTORS

• In this case the main P1/G1 contact and the secondary P2/G2 contacts are used, piloted by two outside automatic devices (such as two pressure switches) adjusted to two different intervention thresholds.
• Each intervention of the P1/G1 contact causes the alternating tart-up of one of the two motors, exchanging the operating function.
• The intervention of the P2/G2 contact causes the start-up of the second motor, thus setting up the emergency help function (when, for example, a single pump is unable to satisfy the pumping requirements.
  See the "Operating Diagram 2"
• When the power supply line is inserted when both the P1/G1 and P2/G2 contacts are closed, the start-up of the second motor is delayed by 2 seconds, thus halving the thrust current and the consequent oscillation of the coil supply voltage.
• The secondary P2/G2 contact also guarantees the emergency help function in the event of failure of the main P1/G1 contact.
• This therefore makes it possible to start-up one of the motors instantaneously, and the back-up motor after a delay of 2 seconds.

■ CASCADE COMMAND

- When 2 or more relays are used, the cascade operation of 3 or more motors is possible, with the exchange of the operating and emergency help functions of the various motors as required..

REFERENCE STANDARDS

Conformity to the EU directives:

2006/95/EC (Low Voltage)

89/336/EEC modified by 92/31/EEC and 93/68/EEC (EMC)

is declared with reference to the following harmonised standards:

Safety: EN 61010-1

Electromagnetic compatibility: EN 61000-6-2, EN 61000-6-4