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Context. This is the heating system at our village hall, an industrial sized Dimplex Ground Source Heat Pump operating from a borehole.
We have the instruction manual for the heat pump, that is a basic unit and only details what is inside it, compressors and valves etc.
The HP is controlled by two boxes that were supplied and fitted by a company who now no longer exist, so they can't help us. One box contains a PLC like programmer and the other box connected to that contains various relays and contactors.
The nub of the problem is the controller has stopped working, it is dead, no display. Its internal fuse was blown, fitting a new fuse resulted in smoke.
Here is the controller.
There is a label on the back, I don't recognise the manufacturer
And another label on the end which might be the software version loaded?
We have the manual for the control box, but neither the manual not the control box itself states who made it. It might be Dimplex it might not. Someone else is trying to find out.
This controller is fed by 24V ac straight from a small transformer, so clearly it has a power supply inside. I thought I would take a look.
This is the PCB inside
The internal PSU is this bit.
One of the blue electrolytics has the classic domed top of a failed capacitor. Some of the surface mount components partly hidden by the heatsink are where the smoke came from.
I am minded to try and fix it, or at least determine where the output of the PSU is and try converting it for an external DC power supply. But the hall management committee have told me not to do that while they try and find a replacement.
Thoughts please, has anyone seen anything similar?
We have the instruction manual for the heat pump, that is a basic unit and only details what is inside it, compressors and valves etc.
The HP is controlled by two boxes that were supplied and fitted by a company who now no longer exist, so they can't help us. One box contains a PLC like programmer and the other box connected to that contains various relays and contactors.
The nub of the problem is the controller has stopped working, it is dead, no display. Its internal fuse was blown, fitting a new fuse resulted in smoke.
Here is the controller.
There is a label on the back, I don't recognise the manufacturer
And another label on the end which might be the software version loaded?
We have the manual for the control box, but neither the manual not the control box itself states who made it. It might be Dimplex it might not. Someone else is trying to find out.
This controller is fed by 24V ac straight from a small transformer, so clearly it has a power supply inside. I thought I would take a look.
This is the PCB inside
The internal PSU is this bit.
One of the blue electrolytics has the classic domed top of a failed capacitor. Some of the surface mount components partly hidden by the heatsink are where the smoke came from.
I am minded to try and fix it, or at least determine where the output of the PSU is and try converting it for an external DC power supply. But the hall management committee have told me not to do that while they try and find a replacement.
Thoughts please, has anyone seen anything similar?
