Hi all,
I have read several posts and searched the internet and believe I have now got the correct procedure to install a Nest for my Greenstar 30DCi classic boiler with an Integral Diverter Value with a DT20 timer.
If I could just get a second opinion, before I proceed it would be really appreciated
Current setup:
Phase 1: Replace HW Cylinder temp sensor with Honeywell L641A1039
1. Turn off boiler
2. Switched off power to boiler
3. Replace HW cylinder temp sensor with Honeywell L641A1039:
5. Turn on boiler
6. Perform a factory reset to allow boiler to recognise cylinder thermostat
Phase 2: Install Nest thermostat
1. Turn off boiler
2. Switched off power to boiler
3. Looking at the boiler, amend wire configuration as per below:
7. Switch on power to boiler
8. Turn on boiler
9. Configure Nest and confirm Heating & Hot Water
Many thanks in advance.
James
I have read several posts and searched the internet and believe I have now got the correct procedure to install a Nest for my Greenstar 30DCi classic boiler with an Integral Diverter Value with a DT20 timer.
If I could just get a second opinion, before I proceed it would be really appreciated
Current setup:
Phase 1: Replace HW Cylinder temp sensor with Honeywell L641A1039
1. Turn off boiler
2. Switched off power to boiler
3. Replace HW cylinder temp sensor with Honeywell L641A1039:
a. Blue: 1
b. Brown: C
4. Switch on power to boilerb. Brown: C
5. Turn on boiler
6. Perform a factory reset to allow boiler to recognise cylinder thermostat
a. Select “spanner” button
b. Select “eco” and “suitcase” button, until you see “8.A”
c. Select “eco” button, until you see “8.E”
d. Select “chimney” button, this will then display “00”
e. Hold “chimney” button, until the display shows “[ ]”
7. Test hot water, by calling for heat and temporally increasing the temp on the HW cylinderb. Select “eco” and “suitcase” button, until you see “8.A”
c. Select “eco” button, until you see “8.E”
d. Select “chimney” button, this will then display “00”
e. Hold “chimney” button, until the display shows “[ ]”
Phase 2: Install Nest thermostat
1. Turn off boiler
2. Switched off power to boiler
3. Looking at the boiler, amend wire configuration as per below:
a. ST10:Lr – remove wire and move to Nest:T1
b. ST10:Lr – connect new wire to Nest:3
c. ST10:Ls – remove wire and move to Nest:T2
d. ST10:Ls – connect new wire to Nest:2
e. ST17: remove plug
f. ST8:7: connect blue wire from HW cylinder cable
g. ST8:9: connect new wire to Nest:5
4. Looking at the Nest Heatlink, amend wire configuration as per below:b. ST10:Lr – connect new wire to Nest:3
c. ST10:Ls – remove wire and move to Nest:T2
d. ST10:Ls – connect new wire to Nest:2
e. ST17: remove plug
f. ST8:7: connect blue wire from HW cylinder cable
g. ST8:9: connect new wire to Nest:5
a. Nest:N – connect mains N
b. Nest:L – connect mains L
c. Nest:6 – connect brown wire from HW cylinder cable
d. Nest:E – connect mains E
5. Looking at the Nest Heatlink, confirm the wire configuration as per below:b. Nest:L – connect mains L
c. Nest:6 – connect brown wire from HW cylinder cable
d. Nest:E – connect mains E
N: from mains N
L: from mains L
1: N/A
2: from ST10:Lr
3: from ST10:Ls
4: N/A
5: from ST8:9
6: from L641:C
OT1: N/A
OT2: N/A
Earth: from mains E
T1: from old room stat (black)
T2: from old room stat (red)
6. Remove DT20 timer from boiler and insert blanking plateL: from mains L
1: N/A
2: from ST10:Lr
3: from ST10:Ls
4: N/A
5: from ST8:9
6: from L641:C
OT1: N/A
OT2: N/A
Earth: from mains E
T1: from old room stat (black)
T2: from old room stat (red)
7. Switch on power to boiler
8. Turn on boiler
9. Configure Nest and confirm Heating & Hot Water
Many thanks in advance.
James
