My friend aked me to try to figure out the CH & DHW controls in his new flat, but unfortunately I'm unfamiliar with the system he has installed so was looking for some insights. Apologies but I didn't get any photos so will try to explain what I saw and hopefully this will trigger an "ah yes that's a totally standard X installation" response!
The property is electric only (no gas). There's a 300ltr direct unvented cylinder, and CH is via typical wet CH system of radiators. The cylinder has 2 heating elements. The upper one is controlled by a Horstman economy 7 controller (both standard and boost cables are wired to the same element). The lower one had a wire heading off into a FCU on the wall. Above the horstman control there was a drayton controller with no visible wires, so I'm guessing this controls the lower element via wires buried in the wall to the FCU.
I have a few questions:
- Is it typical to have 2 seperate controllers, independently connected to the two heating elements? If so is one for CH and the other for DHW?
- What does the inside of the tank look like? Are there 2 compartments, one containing water for the CH and the other DHW?
EDIT: I just discovered that a strange white box I saw was an electric boiler, so clearly this is inline with the CH and must be time-controlled by the drayton programmer. My only query then is what's going on with the 2 separate time-controllers? I'm not sure if the boiler is providing indirect DHW heating, so the immersion heaters are backup only, or if the immersion heaters are the primary source, in which case I have no idea what controls the bottom element...
The property is electric only (no gas). There's a 300ltr direct unvented cylinder, and CH is via typical wet CH system of radiators. The cylinder has 2 heating elements. The upper one is controlled by a Horstman economy 7 controller (both standard and boost cables are wired to the same element). The lower one had a wire heading off into a FCU on the wall. Above the horstman control there was a drayton controller with no visible wires, so I'm guessing this controls the lower element via wires buried in the wall to the FCU.
I have a few questions:
- Is it typical to have 2 seperate controllers, independently connected to the two heating elements? If so is one for CH and the other for DHW?
- What does the inside of the tank look like? Are there 2 compartments, one containing water for the CH and the other DHW?
EDIT: I just discovered that a strange white box I saw was an electric boiler, so clearly this is inline with the CH and must be time-controlled by the drayton programmer. My only query then is what's going on with the 2 separate time-controllers? I'm not sure if the boiler is providing indirect DHW heating, so the immersion heaters are backup only, or if the immersion heaters are the primary source, in which case I have no idea what controls the bottom element...