Override max CH temperature

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Moderator: hvxl

Override max CH temperature

Postby matts430 » Thu Feb 14, 2019 4:13 pm

Hi,

I have recently got started with OTGW with Honeywell Evohome and an Ideal Vogue c32 gen2 boiler. The reason for investigating OTGW was to try to set the maximum flow temperature of the boiler.

By default when using opentherm with the Ideal boiler the central heating flow temperature is set to 80 celsius, I was hoping to be able to change that.

When I use the configure>heater menu to set max CH setpoint it seems to be immediately overwritten.

Is anyone able to suggest a way that I can limit my flow temperature?

Many Thanks


Here is a section of my log file which I think covers it (I tried to set the max temperature to 58):

15:00:39.341273 Command (via websocket): SH=58
15:00:39.363043 SH: 58.00
15:00:39.424005 T80000200 Read-Data Status: 00000010 00000000
15:00:39.569938 B40000200 Read-Ack Status: 00000010 00000000
15:00:39.966009 T80000200 Read-Data Status: 00000010 00000000
15:00:40.072930 B40000200 Read-Ack Status: 00000010 00000000
15:00:40.505983 T80000200 Read-Data Status: 00000010 00000000
15:00:40.670982 B40000200 Read-Ack Status: 00000010 00000000
15:00:41.046939 T80000200 Read-Data Status: 00000010 00000000
15:00:41.170926 B40000200 Read-Ack Status: 00000010 00000000
15:00:41.587977 T80000200 Read-Data Status: 00000010 00000000
15:00:41.772049 B40000200 Read-Ack Status: 00000010 00000000
15:00:42.128381 T80385000 Read-Data DHW setpoint: 80.00
15:00:42.271007 B40385000 Read-Ack DHW setpoint: 80.00
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Re: Override max CH temperature

Postby hvxl » Tue Feb 19, 2019 6:18 pm

Unfortunately your very short piece of logs shows not much relevant to the max CH temperature setting. You included the DHW setpoint message (msgID 56), but that's something different than the max CH setpoint (MsgID 57). Also, the value of MsgID 6 (Remote parameter flags) is relevant. If the boiler indicates that it doesn't support updates of the max CH setpoint via Opentherm (LB1), the OTGW will not attempt to write MsgID 57.
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