A bit perplexed !

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my sister in law has a honeywell y system with a programmer situated in the hall it is a cm51 the bungalow is about 16 yrs old, she has just been on holiday and asked me to turn on her boiler for her ( she said the switch on the boiler ) that is a glowworm fan assisted open vented boiler around the same age of the house, but before turning on the boiler i checked to see if the pump was running, it was and had been all the time she had been on holiday (albeit circulating cold water ) my question is this well i have two

1. does the honeywell cm51 have a provision to control the hot water timed etc or does it just control the room temp like a room stat with programmable features for the central heating side

2. she stated to me that she turned the boiler off because the small radiator in her hall got hot when just hot water was called for

this makes not sense to me, surely the pipe configeration of the y plan system is that when room stat calls for heat the rads get hot

and when satisifield they will go cold

why should just that rad get hot when it is for the domestic hot water side



:oops:
 
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There is clearly a fault on the installation of the system.

Your relative should call a heating engineer when she returns to correct it.

Always amazes me that some people know about faults but don't bother to get them fixed!

Tony
 
Could the rad that gets hot be the heat dump rad, i thought that in some systems the bathroom rad was favorite for this function and why these rads didnt have thermostatic valves on them and that the rads were to left open all the time.
 
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why should just that rad get hot when it is for the domestic hot water side

Often a bathroom radiator or towel rail was connected to the circuit that heated a domestic hot water cylinder. The aim was to dry towels and provide some heat in the bathroom when the central heating was off.

Maybe the hall was formerly a bathroom or someone has connected it to the wrong pipes. Your sister needs to trace the pipes to determine where the fault is.
 

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