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Re: Newbie start with Homematic CCU3: Initiation
Verfasst: 05.12.2018, 12:40
von tomi_cc16
blueznl hat geschrieben: ↑05.12.2018, 12:27
Buy a spare CCU. And a spare boiler. Redundancy everywhere!
And spare house
RE: Junkers Euroline from Homematic & Homematic IP
Verfasst: 05.12.2018, 16:17
von Sergo
blueznl hat geschrieben: ↑05.12.2018, 12:27
Buy a spare CCU. And a spare boiler. Redundancy everywhere!
Funny
In real world, folks who live just 600 km north from me, usually have up to 3 independent heating systems in the house. Not for fun, just because they are living at border of polar circle
My place in much warmer and we are getting below -15-20C in January & February. In case of heating system failure we usually have about 24-48h until everything will freeze out. Gas heating service promise to fix problems in 12h after call. But nobody will research what is the problem in home automation, when owner is out of country.
So, heating system have to be with double, even triple safety margin.. if you want to be on the safe side.
Hope this helps to uncover motivation to minimize/remove additional, unnecessary chains in heating command line & build duplication of routes to master heater(s).
Re: Newbie start with Homematic CCU3: Initiation
Verfasst: 05.12.2018, 23:08
von blueznl
Ah okay, that makes everything much clearer!
(I have been building datacenters for a living so I know something about availability and reliability
)
Now let's think...
I think you could do the following:
- use an actuator (read swtich, for example the 4 relais board)
- use a controlled valve
- use a thermostat
- create a direct link between thermostat and controlled valve
- create a direct link between thermostat and actuator
Repeat the above as many times as required.
I assume the boiler is a regular open / close contact, normally open, so you could connect several actuators (switches) in parallel.
I used a similar config for a while, but I wanted my pumps to run for an extra 15 minutes, so I used a CCU to add that delay. I can't recall if I used two direct connections, but I tried to set up one at home, and that seemed to work fine.
Unless I completely misunderstood your purpose...
RE: Junkers Euroline from Homematic & Homematic IP
Verfasst: 06.12.2018, 09:07
von Sergo
blueznl hat geschrieben: ↑05.12.2018, 23:08
(I have been building datacenters for a living so I know something about availability and reliability
)
I used a similar config for a while, but I wanted my pumps to run for an extra 15 minutes, so I used a CCU to add that delay. I can't recall if I used two direct connections, but I tried to set up one at home, and that seemed to work fine.
Great to meet soul who knows what reliability of 99.99 mean
That is exactly what I'm after: nothing fancy, just couple of thermostats from first floor to drive directly heater and in back-end, with delay, same handled via CCU + radiator's by other pair of switches.
Similar setup repeated for second floor. This way I hope to get system almost fault proof, at least to desired level.
.
P.S. Long ago I have installed simple gas heater (not condensed type) with pump embedded. There is positive & negative aspects of this solution, but as benefit, this gas heater may operate continuously(by design) in ON mode , in case thermostat switch is stuck in ON.. but I would consider this as an emergency mode..
Re: Newbie start with Homematic CCU3: Initiation
Verfasst: 15.12.2018, 09:06
von Sergo
Through discussion here
viewtopic.php?f=49&t=46217&p=476195#p476195 on HM-IP-MIOB realized that there is a risk of not being able to manipulate with heater switch HM-IP-WHS2 by wall thermostats
The only related topic
https://www.elv.de/topic/potenzialfrei-schalten.html not promising, at all. Added my question there..
Re: Newbie start with Homematic CCU3: Initiation
Verfasst: 27.12.2018, 13:07
von tomi_cc16
Sadly no feedback yet from ELV for your question to HmIP-WHS2
https://www.elv.de/topic/potenzialfrei-schalten.html
Re: Newbie start with Homematic CCU3: Initiation
Verfasst: 05.02.2019, 17:52
von Sergo
Ok, HmIP-WHS2 in da house!
Time to play, hope to provide initial feedback even before weekend.
Text on packaging increased worry about ability to connect wall thermostat to HmIP-WHS2
Re: Newbie start with Homematic CCU3: Initiation
Verfasst: 05.02.2019, 19:11
von tomi_cc16
I keep fingers crossing for you
Re: playing with HmIP-WHS2
Verfasst: 06.02.2019, 16:14
von Sergo
Ok, its a right time
What boys do first with new toy? Right, disassemble it into pieces
- A lot of space.. even for extra, higher amperage relay
.
- Lets go one step further. Classic relay's, what else you may want in this life :wink:
.BTW, relay produce noise, dont count for installing WHS2 in bedroom
.
And.... looking also on back side of PCB... conclusion: YES, it seems like we can easily get "dry" contacts with HmIP-WHS2
Time to prepare test bench.... stay tuned
Re: playing with HmIP-WHS2
Verfasst: 07.02.2019, 10:59
von Sergo
Quick update:
Setup of HmIP-WHS2 in "emulator" mode done (for now managing light bulb, as indicator)
Connected
two HmIP-WTH2 to HmIP-WHS2 via direct connection on CCU3 as heat pump, all run on latest firmware version (details later, today)
- WTS2_2.png (156.5 KiB) 4369 mal betrachtet
All seem to work according to expectations
- bulb is ON on by request from
any of two connected HmIP-WTH2
- bulb is OFF only
when both HmIP-WTH2 are no longer require heating
Will monitor for few days and plan is to engage HmIP-WHS2 in "real work" on this weekend.
P.S.
PLEASE, forgive me for letting power and signal cable to go in to same hole of HmIP-WHS2..its an workbench setup