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by maxcaddy
Thu Jan 29, 2009 10:49 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Two Pump System
Replies: 8
Views: 3783

Thanks for that :D Seems the N07AW relay on the smaller base (N32AW ?) is the way to go. Have you, or anyone on here, wired one ?, and if so which of the 8 pins did you use ?, or is there a wiring diagram with the maplin kit which clearly identifies which of the pin-outs matches the 5 contacts which...
by maxcaddy
Wed Jan 28, 2009 11:11 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Two Pump System
Replies: 8
Views: 3783

OK no worries, its all sorted with the help from Honeywell who have provided a drawing of exactly what I needed. Other than......

Where can I buy a cheap SPDT relay ?

thanks

MC
by maxcaddy
Wed Jan 28, 2009 12:27 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Two Pump System
Replies: 8
Views: 3783

Many thanks Sparx, I guessed it would only be wiring the thermostats into the line, with the actual pin to pin contacts being the unknown. Actually I don't have any relays in the system. Its simply timers onto pumps. Yes I know someone will say there's the issue of differential pressure when both pu...
by maxcaddy
Fri Jan 23, 2009 11:00 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Two Pump System
Replies: 8
Views: 3783

Thanks for that, but I'm not sure why I would want to buy 2 motorised valves, when all I need is to control the switching on/off of the pumps ?. I already have bought a contoller and the thermostats, and its only identifying the system wiring which will power the HW pump when the HW thermostat is cl...
by maxcaddy
Thu Jan 22, 2009 11:03 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: log burner with back boiler
Replies: 3
Views: 4236

I did the same to mine 4 years ago when the heat exchanger in the fire started to leak, and had no problems whatsoever. Pity though as it used to give me a lot of 'free' hot water.

MC :lol:
by maxcaddy
Thu Jan 22, 2009 10:45 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Two Pump System
Replies: 8
Views: 3783

Two Pump System

I have a standard vented oil fired system installed in 1971 as pumped CH and Gravity HW, updated in 2006 to (Worcester Greenstar 32-50) running 2 pumps (CH +HW) (2 NRVs) and operating off of two 24hr timers (linked boiler feed), with no thermostats. Can anyone point me in the direction of a wiring d...
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