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I have a grants 90btu MKII oil fired combi which cuts out regularly. It has the oil tank in the basement and the burner on the ground floor I would say approx 2m above the bottom of the boiler. I believe it has a two pipe tiger loop setup. Is that distance likely to cause the negative pressure to be greater than 0.4 bar?
How do you calculate the negative bar? That'll impress the engineer when he turns up this week.
As well as the above the system has no thermostats other than the stats in the boiler itself. no room stats, no frost stat, no rad stats. I thought that would be a fairly standard setup these days - are there building regs regarding use of stats in new build houses?
When the CH does get going without the boiler cutting out, the rads can be "too hot to touch".
The boiler is one of these with an internal 40 litre tank which is kept hot so that there is DHW on demand. But at nighttime the echo of the boiler can be heard in an adjoining bedroom. Would it be ok to connect an external timer so the system is off totally between say 10.30 pm and 6am in the morning. Presumably this would mean bypassing the internal timer which is one of those "lug in for on" and "lug out for off" jobbies.
One other point which I hadn't considered was air in the system. What is the correct procedure for bleeding a combi system? I always worry about putting too much pressure in the system.
A Service Engineer who has worked on these boilers for 20 years is hopefully coming out next week. What sort a questions should I be asking him? The builder is prepared to pay the bill "if it isn't too much". But as far as I can see this is a poor standard of installation, with the possibility that the boiler is faulty as well - there is a smell of fumes in the utility room - which has no ventilation other than the flue of the boiler itself.
Replace the _ _ _ with @ . . and remove the ".hotmail.com" for a personal response which would be much appreciated.