RE: Solenoid Radiator valves

["Neil Ball" <neilball@xxxxxxx>]

There are a few options:

1) 240v or 24v actuators that fit directly to the radiator TRV. I would
recommend Honeywell versions as they are robust, quiet in operation and
loo=
k
ok fitted. I would suggest that on/off (better known as raise/lower or
moto=
r
open/motor close) actuators would be better and cheaper for a homebrew
system as it will allow control from both thermostat or sensor based
system=
s
quite easily. Proportional control could give a smoother response but that
relies on a bit more programming effort with the control strategy.=20

2) 240v or 24v themo-electric actuators could also be used. They are a
little slower to operate, but these are what get used on most underfloor
heating manifolds, and are cheaper again than the fully electric actuators.

In both cases you must match the actuator torque to the valve being used to
prevent damage to the valve. It's worth looking for your nearest branch of
Control Center to get an idea on costs for both actuator types.

In the end, whatever the cost of the actuators it still remains the only
practical way to zone a conventionally plumbed radiators system.

HTH

Neil.


-----Original Message-----
From: Kevin Hawkins [mailto:lists@xxxxxxx]=20
Sent: Monday, April 07, 2003 01:17
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Solenoid Radiator valves


You should also consider using a proportional valve rather than just
ON/OFF=
.
I have some ON/OFF ones and I still get oscillation around the setpoint due
to retained heat (forgotten the tech word) within the radiators. (I was
basically using zone valves)

I have researched a few inline / TVR replacement options =96 You can get
plain ON/OFF down to about =A325 but proportional all seem to be circa
=A36=
0
plus. There is a very low cost device (TVR replacement) that works on
thermal expansion =96 basically you apply voltage and it heats and expands
=
but
the response time is quite slow.=20

Kevin

=20

-----Original Message-----
From: Jan Frickel [mailto:jan@xxxxxxx]=20
Sent: 06 April 2003 21:37
To: ukha_d@xxxxxxx
Subject: [ukha_d] Solenoid Radiator valves

=20

Does any one know where I can get solenoid valves to bolt on to my
radiators, so I can use my home vison i/o and relay card to drive the
heating room by room. The only ones I have found are ?50 an peice.. eekk .

Jan
UK


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