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Hi I have an Elite 50 ( old faithful reliable boiler ) and the mechanical Horstmann 424 Emerald p.o. programmers pump breaker has worn. So the pump is running 24.7. I'd like a replacement programmer which will do the same job and would be grateful if you can recommend one. My existing wiring configuration are as follows: 1) Mains supply to programmer = Live/Neutral/Grnd 2) Pump to Programmer = Live/Neutral/Grnd 3) Boiler controller/Regulator = ( 4 core ) Live (Br)/Neutral(BL)/Grnd (Gr) + RED wire ( which goes to the terminal named Solenoid ). Can you recommend a programmer for this and advice which of the wires above connect to which terminal of the new programmer. Will really appreciate it if you can help. Thanks/ Mike

Submitted: 144 days and 6 hours ago.

Category: HVAC

Value: $9

Status: AWAITING CUSTOMER ACTION

Posted by Rick Mather 144 days and 4 hours ago.

Answer

Are you looking for an aquastat that controls the burner operation and the pump also and do you need to mantain a boiler temperature or cold start

143 days and 21 hours ago.

Reply

Hi, I am looking for a programmer/timer that will replace my existing mechanical one.
(Horstmann 424) as detailed above, it controls the pump,( pump should continue after for about 10 mins or so after the system switches off., The programmer also controls the boiler ( wired to controller/regulator assembly with thermostat honeywell v5335A) this is the one with 4 wires going to the programmer. I believe my Elite 50 is a gravity system, the heated water goes via a manual lever 3-port valve that channels to hot water (cylinder) and rads. If I can upload photos to make it easier , but there is no facility here.
I read somewhere online ( old posting in a forum ) that someone has managed to replace the programmer with a Danfoss TS715. But they did not post details of wiring.,

Posted by Rick Mather 143 days and 18 hours ago.

Answer

Are you from the UK?

143 days and 12 hours ago.

Reply

Hi, yes I am based in the UK

Answer

Well not good with that programmers so will opt out and see if someone else can help

Accepts:
Expert:	Rick Mather
Pos. Feedback:	96.2 %
Answered:	7/1/2009

HVAC Technician

35 years experience, HVAC

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Answer

Are you looking for an aquastat that controls the burner operation and the pump also and do you need to mantain a boiler temperature or cold start

Reply

Answer

Are you from the UK?

Reply

Hi, yes I am based in the UK

Answer

Well not good with that programmers so will opt out and see if someone else can help

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