Y plan cable tracing advice

[diydummy1]

Hi all....

I'm after some advice as to the best way of finding out which cable comes from what component inside the wiring centre - which is a total mess.

Does anyone have a quick way of testing to find out what comes from the room stat, programmer etc?

I know that whatever joins the white wire is from the room stat, but need to track what goes to and from what.

Is there a way of doing a continuity test without the use of a 200ft cable on my multimeter!???

Basically, problem is, someone has been in the my friends house, hes just moved in..... heating will only work with HW.

3 way valve just sits in mid position with heating on only, even with cylinder stat turned right down....... tried to swap a few wires in prog but it just caused it to motor to heating with HW on and calling?!

All advice appreciated greatly

Steve

 

[doitall]

There you go straight out of the honeywell book.

electrical check for installed Sundial Y Plans to
help in commissioning and to pin-point the source
of any electrical problems.
Remember the Golden Rule when you have a
problem. First of all check your wiring. Only start
suspecting faulty components after you are satisfied
all wiring is correct.
The following notes will help to identify faulty
components.
Cylinder Stat
First of all, make sure you have wired to the correct
terminals.
Terminal C (common) is the Left Hand terminal.
Terminal 1 is the Middle terminal.
Terminal 2 is the Right Hand terminal.
Suspect the cylinder thermostat is faulty only if
Terminal 1 does not become live when calling for
Hot Water, or Terminal 2 does not become live
when satisfied. (Make sure that Terminal C is live in
both cases). While checking, disconnect Terminals 1
and 2 to prevent false readings due to backfeed.
Room Stat
1) Remove wire from Terminal 3.
2) Live to Terminal 1.
3) Turn stat to call, if no live on 3 then faulty.
Suspect the room stat is faulty only if Terminal 3 is
not live when calling for heat. (Make sure Terminal 1
is live). While checking, disconnect wiring from
Terminal 3 to prevent false readings due to
backfeed.
Mid-Position Valve
Suspect the V4073A valve is faulty only if the valve
does not operate as specified in the following
checks (these should be done in order 1, 2, 3, 4, 5
and 6).
Valve open for Heating only
1. Switch off mains supply. Disconnect Grey
and White wires from appropriate junction box
terminals. Reconnect both Grey and White
wires to permanent live terminal in junction box.
2. Switch on mains supply. Valve motor should
now move to fully open heating Port A. The
motor should stop automatically when Port A is
open, and stay in this position as long as power
is applied to White and Grey wires. When Port
A is fully open, the Orange wire becomes live,
to start pump and boiler.
Double check by feeling that Port A outlet is getting
progressively warmer.
Valve open for D.H.W. only
3. Switch off mains supply. The valve should now
automatically return to open D.H.W. Port B and
close Heating Port A.
4. Isolate Grey and White wires and make safe.
Remove cylinder stat wire from Terminal 6 in
junction box and connect to permanent live.
Switch on fused spur, cylinder thermostat
must be set to call for heat, pump and boiler
should start.
Valve open for both D.H.W. and Heating
5. Switch off mains supply. Replace cylinder stat
wire to Terminal 6. Isolate and make safe Grey
wire and connect White wire to permanent live.
Switch on mains supply, motor should now
move to mid-position and stop automatically.
Cylinder thermostat must be set to call for heat.
Both ports A & B are now open for Hot Water
and Heating. Boiler and pump should start.
Double check by feeling that pipe outlets from ports
A & B become progressively warmer.
6. Switch off mains supply, reconnect White and
Grey wires to junction box terminals.
If this check completes satisfactorily, the problem is
not the valve, but elsewhere in the circuit.
Programmer
Suspect the programmer only:
(a) After you have made sure that any links
required are in place,
(b) After you have made sure that the Programmer
has power – to the correct terminal,
(c) After you have made sure that the Programmer
timing is set up correctly (see individual
Programmer User Guide as appropriate),
(d) If live does not appear at Heating ON Terminal
when Heating only is selected on continuous or
timed,
(e) If live does not appear at Hot Water ON
Terminal when Hot Water only is selected on
continuous or timed,
(f) If live does not appear on Hot Water OFF
terminal with Hot Water OFF on programmer.

 

[doitall]

part 2

Programmer Heating only Hot Water only Hot Water and
Switch Position selected selected Heating selected
Programmer Live on both Live on Live on both
‘CH ON’ & ‘HW ON’ ‘CH ON’
‘HW OFF’ Terminals. Terminal. & ‘HW ON’
Terminals.
T6360B Room Set to call for No live on any Set to call for
Thermostat Heat. Live on terminal. (See note 2 Heat. Live on
Terminals 1 & 3. for Terminal 3). Terminals 1 & 3.
L641A Cylinder Nominal 90 volts. Set to call for Hot Set to call for
Thermostat Live on Terminals Water. Live on Hot Water. Live on
1 & 2 (Note Terminal Terminals C & 1. Terminals C & 1.
1 only becomes 240 (See note 2 for (See note 2 for
volt live after V4073A Terminal 2) Terminal 2)
valve opens and
Boiler fires). (See
notes below).
V4073A 3 Port Live on Grey, White Live on Orange wire Live on White
Mid-Position and Orange only (See note 2 for wire and
Valve wires. Grey and White wires) Orange wire.
Valve opens to Port Valve not energised. (See note 2
A for Central Heating Port B open for for Grey wire).
(C.H.). Domestic Hot Water Valve in mid
(D.H.W.). position for C.H.
and D.H.W.
Boiler and Pump Boiler and pump Boiler and pump Boiler and pump
fired via live feed fired via live feed fired via live feed
from Orange wire. from Terminal 1 on from Terminal 1
cylinder stat. on cylinder stat
and Orange wire.
NOTES 1. Check must only be made by a suitably qualified electrician.
2. Low A.C. voltage may appear on specified wire or terminals due
to back feed from V4073A valve. If in doubt, disconnect Grey or
White wire as appropriate, or check with meter for full 240V.
3. Blue wire on valve must be connected to neutral.
4. Terminal 2 on room thermostat must be connected to neutral.
5. Ensure that any links required in programmer are in place.
6. Earth connection (Green/Yellow) must be made on valve.
7. Earth connection not needed on room stat or cylinder stat.

 

[sooey]

Is there a way of doing a continuity test without the use of a 200ft cable on my multimeter!???

If you're rewiring it anyway you can disconnect everything both ends, then link wires at for example cylinder stat. Then see which wires have continuity at the wiring centre. It's a bit of a long winded way of doing it but it will tell you where each cable is going. Then just follow the yplan diagram to wire it back up.

 

[bengasman]

As you have to rewire anyway since it doesn't work, and it is a mess, disconnect everything.
Label all the cables that you can trace.
Use the beep on your meter to identify which cable goes to roomstat, and which wire does what.

Do not assume that blue, brown or yellow/green cables are safe, they can well be connected to phase.

Do not attempt to do this unless you are experienced with 230V, and know exactly what you are doing.

 

[D_Hailsham]

There you go straight out of the honeywell book.

electrical check for installed Sundial Y ...

A sterling effort dia! But wouldn't it have been quicker to give the link to the book? Honeywell Wiring Guide

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