Questions about Vaillant ecoTEC Plus 837

[bverduijn]

We have a VRC430 Weather Compensator control panel installed on our Vaillant ecoTEC Plus 837 boiler and also have a VR81 remote control unit installed in the living room.

1. What is the relationship and interaction between the programmed times for heating and hot water, and the two big control dials on the left handside of the boiler control panel? For example, what temperature does the hot water go to if the time programme dictates 52 degrees, but the temperature control dial on the left is set to, say, 45 degrees? Similarly for the heating: the heating dial on the left is turned to the lowest setting (30 degrees) and the time programme for heating is set to, say 18 degrees. Which setting takes precedent?

2. In relation to the question above, the radiators do not start heating up until the bottom-left dial is turned up, even though the target temperatures on both the time programme and remote control unit have been set to well above the actual room temperature. What's going on?

3. Section 4.3.3 in the user manual for the VRC 430 Weather Compensator states that the display should return from the basic display to the default display after 5 minutes or by clicking either dial. This does not happen. In fact, I've never seen the default display. Can you clarify?

4. Should the room temperature control (Menu C8 - HC1 parameters) be set to 'none', 'modulating' or 'thermostat'?

5. In menu A5 ("Installation Assistant Module Test Menu") there is an option for Heat Source Choice, which can be set to either 'OFF' or '50 degrees'. What does this mean and what value should I select?

6. The heating is set to automatically go on at 15 degrees, but it seems to kick in when the outside temperature falls below 15 rather than the inside temperature. (I have two sensors). Could they be connected incorrectly? What's going on?

 

[wnjswozo]

ring your installer,he would have to be there to check it,and to explain to you,me personnaly would take out weather comp,and val control
and fit a more user freindley control ,thats the only thing thats vaillant down ,controls to complicated for end user

 

[oldplumber]

All these controls are great and work well, however the customers dont seem to be able to leave alone once set up, then it all goes wrong, Im off first the tommorrow to reset a worcester rf compensated room stat thats been fiddled with, another£45-00 charge to the custard, she'll never learn!