So hope you can help I have a Glow worm Micron FF50 Boiler, Gravity Fed system for Heating and Hot Water Hot water - works and boiler kicks in when required, the temperature is not controllable, probably due to the fact that there is no cylinder stat. Central heating - Works in that it will heat up - there is no Room Stat just a cable out of the wall, so to get the heating on I manually move the lever on the valve So the physical plumbing is good and works, the wiring is a mess see picture The valve is a Honeywell 3 way with 5 Wires Oh and there is the Programmable timer for Hot Water and Central Heating So my plan is to Buy a Cylinder Stat - Honeywell L641A Cylinder Stat - http://www.screwfix.com/p/honeywell-l641a-cylinder-stat/40051 Buy a Room Stat - Honeywell T6360B Room Thermostat - http://www.screwfix.com/p/honeywell-t6360b-room-thermostat/26159 Buy a HVAC Wiring Centre, Honeywell 42005748-001 - http://uk.rs-online.com/web/p/hvac-wiring-centres/2001342/ Looking at the wiring centre it seems to clearly show which wires go were Am I on the right lines ? Regards John Berman
check your boilers instructions before you do anything, check if theres a need for a pump over run, check you have the right amount of cores at each point. then gew for it if your competent with electrics, safe isolation etc.....
Thanks, well I have checked the manual and no mention of Pump Over Run, what do you mean by Cores at each point ? Thanks in advance John B
The amount of wires required at each point ie if your stat requires a live, switched live and a neutral (+earth) its no good if you only got a two core cable going to that position.
understood, so quick check shows that thermostat has 3 cores so thats a plus although I guess 4 core would be better - i can install new cable prior to carpets going down
plan it out, plan the position of everthing, run cables with the correct number of cores, wire up when ready/ as a final fix. note you can not use the uninsulated earth in twin/ three and eath cable as a live cable, if unsure run an extra cable. make sure there is an earth core at each point even if its not needed, it may be needed at a later date.
so bits have arrived but im confused (already) the Wall Stat has 4 connections and an Earth so I laid a 5 core back to the wiring centre, that however only has 3 connections for the room stat ? I also note that there is a HTG Valve and a MID POSN or HW Valve - No I have a 3 way port valve so which is this in the wiring centre. Thanks in advance John B
[QUOTE="John Berman, post: 1307146, member: 117144]the Wall Stat has 4 connections and an Earth so I laid a 5 core back to the wiring centre, that however only has 3 connections for the room stat ?[/quote] You will only use three connections on the stat - 1, 2 and 3. Pity you purchased an almost obsolete stat (about 30 years old). A modern digital stat is so much better, eg Honeywell DT 90E The 3 way valve is normally called a mid-position valve.
thanks for that, so out of curiosity what's the HTG Valve connector block - I assume its to cover all scenarios ?
Further to this im going to buy a new programme timer for the hot water \ central heating given i have Glow worm Micron FF50 Boiler, Gravity Fed system for Heating and Hot Water and have bought Cylinder Stat - Honeywell L641A Cylinder Stat - http://www.screwfix.com/p/honeywell-l641a-cylinder-stat/40051 Room Stat - Honeywell T6360B Room Thermostat - http://www.screwfix.com/p/honeywell-t6360b-room-thermostat/26159 HVAC Wiring Centre, Honeywell 42005748-001 - http://uk.rs-online.com/web/p/hvac-wiring-centres/2001342/ can anyone recommend a compatible programmable timer Regards John Berman
It's not clear from your earlier description if you already have a timer. If you do, I suggest you retain it for timing the hot water and buy a programmable thermostat for the central heating. The Honeywell CM9XX is highly recommended. It comes in 24hr and 7 day versions in wired and wireless. Send the T6360B back!! The "heating valve" connector block is used, in conjuction with the HW block, when you have a system with separate valves to control heating and hot water.