Buderus Logano G215/ Logamatic

dermy22

Hi there - I am new to this forum so please forgive my “noob” questions.

I recently purchased a home that has an oil fired Buderus Logano G215 with Logamatic controls. While the system works great, there are a few things I can’t seem to wrap my head around. Despite reading the manual several times, I am still a bit fuzzy. Was hoping to get some helpful insight from the community here.

I noticed when I bought the house the system was set to Auto via the Family program. From reading the manual, I understand this means that night mode kicks on at 10pm. While this was great in the summer, the winter (I live in the Northeast), this is a different story. Our Buderus acts as more of a backup heat option as we have heat pumps for heat above 40°F. Now that it is below 40°F routinely, I am finding that my house is chilly in the morning following night mode kicking in at 10pm and kicking off (back to day mode) around 5am. Day mode is set to 73°F and night mode is set to 72°. Yet what I find is that the boiler doesn’t kick on anytime after 10pm (even if the thermostat is calling for heat) if night mode is on. I have it overriding manually to day mode now due to this.

My confusion is around why night mode doesn’t generate any heat. I understand this in the summer but if it’s 25°F outside it seems like a configuration setting needs to be changed. These are the settings I inherited and am happy to make changes if it means the Buderus runs more efficiently.

Thanks in advance!

BDR529

The boiler sets its temp from an outside temp sensor.

Take vertical shift of heat curve and set it to the highest setting

set perim-heat and or floor heat to 24hr (one is for radiant unless you have the 241 card will not be able to Access, can't remember wich)

WWSD (warm weater shut down, umbrell logo) at 62

If it is a giant PITA swap it out to a honeywell control

dermy22

Hi @BDR529 - thanks for the response! I suppose I am still confused. I understand the outdoor temperature influences how often the boiler runs.

Based on the image from the manual here, shouldn’t the boiler be running more frequently at night (given the drop in temperature) compared to the day? If so - I am seeing the exact opposite.

GW

Something does seem odd with your description.

Do you have a Buderus thermostat?

If you press the Sun button, it should stay in daytime mode. Give that a shot.

I’m curious- Are the heat pumps connected to the heating system in any way?

dermy22

I have 4 thermostats. Two Trane thermostats (first floor and second floor, a Honeywell for master bed, and a Honeywell for master bath). When I press the sun button, it does stay in day mode. But I would ideally like it to be set to auto as I feel that leaving it in day mode all winter is wasting fuel.

The heat pumps are connected to the heating system in the sense that when it’s above 40° they run, and when it’s below 40° then shut off and the boiler passes heat through the baseboards. We do have radiant heated floors as well I should note.

BDR529

Radient, might have the 241 card, hope you have a 3-way motorized mixing valve with a room sensor. room sensor will allow a vertical shift of the heat curve but only for the radient only and only if the 241 card is installed.

Will need the SERVICE manual. enter settings through the code as descibed in manual.

Set heat to 24hrs and max out the vertical heat curve setting.

If the radient is done right mixing valve will prevent it from getting wacked with 180-200 degrees

Note: 120 for radient

Think you should call the guy have no idea what we are even working with.

HVACNUT

If the baseboard isn't enough to carry the whole load, and it, as well as in floor radiant is left to take over (not in addition to the heat pumps) when below 40°, then it's not getting a fair chance. Radiant needs time to heat. Is the baseboard and radiant on the same zone? If you can, set the radiant temperature, and leave it. Have the baseboard as an auxiliary, or Stage 2 to aid the heat pump, not replace it.

Big Ed_4

On the Logomatic if you push the Sun button , it will bypass the programed set back format ….

Push the radiator button to set your desired inside temperature .Durning the cold weather I set to a few degrees higher.. The thermostats will throttle it down if needed,,,

GW

You must be in MA, MassSave territory, with the 40 degree switchover (it's been lowered to 30 a couple years ago). Me—-I would not be knocking out the radiant. But, rules are rules. And, ideally, you want the radiant to be contestant circulation, but that's a whole different topic.

As mentioned, you need to get the moon setting to whatever temp you want. Remember, this is just a computer tying to extrapolate some math. You don't have the Buderus indoor temp sensor (the BFU), so the boiler has no idea what exactly is happening in the home.

I have the same boiler at my office, yet i have the BFU so i can't easily replicate what you need to do (without disabling the BFU for a few minutes)

If you can't figure it out, shout back