automated Dual fuel control Novus P2000
Got a call to a dual fuel system that has an error flashing on the controller. The controller is a Novus P2000. At least that's the process controller that's installed on the box. The Box in question had two wires coming from the zone valve on a hydronic heating system, WM Gold oil boiler pretty straightforward. The two wires from the zone valve from the process controller have been disconnected and tied back. I'm not sure when that happened. But the boiler is running fine. I serviced this boiler and made a repair on it back in the fall last year. I didn't even notice the extra thermostat wire from the dual fuel controller wrapped up in the overhead.
The other wires go out to a Fujitsu three head mini split system. The wires are routed into the line hide that go to the individual heads.
The mini split system is running fine as well. When I remove power from the dual fuel controller at least that's what I think it is, the Mini Splits keep working.
The only reason anybody ever identified that there was a problem is that the Novus controller is flashing Err1.
The gray box that the process controller is installed on does not have a name or model number the only identifying feature is on the process controller, Novus and P2000. Searching for those, all I get is a manual for the process controller which is not specific to this function as best I can tell does anybody ever seen one of these?
The customers don't seem interested is the dual fuel control system and want it isolated. I would like to find a diagram for it and be able to properly isolate it from the mini splits or reconnect the boiler and the intended functionality if they change their minds.
Comments
-
This is the box in question.
from the P2000 manual, Err1 is "Configuration or connection problem in the Pt100cable"
PT100 is an RTD input, probably the disconnected zone valve.
0 -
That looks like a generic process control. Sounds like it isn't made specifically for HVAC use but can be used for that if configured right.
This control probably has a sensor of some kind I would guess an outdoor air sensor to change over from heat to cool.
These controls can usually be configured for different outputs
0 -
Here is the manual. I haven't read it yet. There is also a U tube video on this control
I have worked with similar controls but not in a while. There is a learning curve. First thing is to pull the control out of the box and sit down and make a wiring diagram. Then you will probably be able to figure out what it is doing. As I said there must be at least 1 sensor or other input to the control.
1 -
I found this N2000 and this one too N2000 Spanish
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
0 -
Can't use the Spanish one. Didn't you see the news today? Spain is not paying there share to NATO so someone is going to Tariff them.
3 -
Those process controls are pretty good you can configure them to do a lot of different things. Good for controlling 0-10vdc or 0-20ma valves and dampers but they used to cost around $250. kind of overkill for residential.
1 -
Good point, I probably need to reverse engineer a diagram. The annoying thing is that there is no instruction manual that is suitable for the homeowner. Like how to change the cross over temp if needed when the cost of the two fuels changes. in this case oil and electricity
0
Categories
- All Categories
- 86.9K THE MAIN WALL
- 3.2K A-C, Heat Pumps & Refrigeration
- 57 Biomass
- 425 Carbon Monoxide Awareness
- 111 Chimneys & Flues
- 2.1K Domestic Hot Water
- 5.7K Gas Heating
- 106 Geothermal
- 160 Indoor-Air Quality
- 3.6K Oil Heating
- 70 Pipe Deterioration
- 978 Plumbing
- 6.3K Radiant Heating
- 387 Solar
- 15.4K Strictly Steam
- 3.4K Thermostats and Controls
- 54 Water Quality
- 44 Industry Classes
- 47 Job Opportunities
- 18 Recall Announcements