Sunvic Thermostat problems.
 

I am replacing my sunvic 2259 thermostat with a sunvic 4101, but can't
make sence of the wiring.

The 2259 has 3 connections and the earth connected to a metal back
plate, while the 4101 has connections COM, DEM, SAT, and N. I can't
figure out which wire to stick where.

I have read an earlier post on there where the poster had 3 wires -
red, black and unsheathed. But i have 4 wires, blue, red, yellow and
unsheathed.

All help gratefully recieved...running out of 3 amp fuses now lol.

Thanks in advance.

Matt.

Sunvic Thermostat problems.
 

matt1245 wrote:
I am replacing my sunvic 2259 thermostat with a sunvic 4101, but can't
make sence of the wiring.

The 2259 has 3 connections and the earth connected to a metal back
plate, while the 4101 has connections COM, DEM, SAT, and N. I can't
figure out which wire to stick where.


COMmon (live)
DEMand (switched live when its too cold)
SATisfied (swwitched live when its warm enough)
Neutral.

No earth it seems

I have read an earlier post on there where the poster had 3 wires -
red, black and unsheathed. But i have 4 wires, blue, red, yellow and
unsheathed.


Normally red goes to COMmon
Blue goes to Neutral
Yellow goes to DEMand

Unsheathed (EARTH) won't be connected, and neither will SATisfied.

All help gratefully recieved...running out of 3 amp fuses now lol.

Thanks in advance.

Matt.

Sunvic Thermostat problems.
 

Normally red goes to COMmon
Blue goes to Neutral
Yellow goes to DEMand

Unsheathed (EARTH) won't be connected, and neither will SATisfied.



Thanks.

There is a table with the wiring diagram, and for the 4101 it shows
that com goes into hole 2, dem goes into hole 1, sat goes into hole 3,
and the neutral is listed as n/a.

I take it i don't wire the neutral then?

Can you tell i'm new to this lol.

Thanks

Matt.

Sunvic Thermostat problems.
 

In an earlier contribution to this discussion,
matt1245 wrote:

Normally red goes to COMmon
Blue goes to Neutral
Yellow goes to DEMand

Unsheathed (EARTH) won't be connected, and neither will SATisfied.



Thanks.

There is a table with the wiring diagram, and for the 4101 it shows
that com goes into hole 2, dem goes into hole 1, sat goes into hole 3,
and the neutral is listed as n/a.

I take it i don't wire the neutral then?

Can you tell i'm new to this lol.

Thanks

Matt.

If it's an electronic stat rather than a mechanical one, it won't have an
accelerator heater and you don't need a neutral for the heater return - so
the blue wire needs to be taped off and made safe.

It sounds like you connected it to SAT to stop it being lonely! The stat is
a changeover switch which connects the live input (COMmon) either to DEMand
(when the room temperature is below the stat setting) or to SATisfied (when
the room temperature is above the stat setting). For a normal heating
system, you don't need anything connected to SAT. If you connect neutral to
it, as soon as the room warms up to the set temperature, you get a dead
short between live and neutral - with a resulting loud BANG!
--
Cheers,
Roger
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Sunvic Thermostat problems.
 

Thanks a lot for your help guys.

Got it working now(till the next problem comes up lol).

Matt.

Sunvic Thermostat problems.
 

matt1245 wrote:
Normally red goes to COMmon
Blue goes to Neutral
Yellow goes to DEMand

Unsheathed (EARTH) won't be connected, and neither will SATisfied.



Thanks.

There is a table with the wiring diagram, and for the 4101 it shows
that com goes into hole 2, dem goes into hole 1, sat goes into hole 3,
and the neutral is listed as n/a.

I take it i don't wire the neutral then?


BLUE goes to NEUTRAL.

Can you tell i'm new to this lol.

Thanks

Matt.