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Electrical
Fitting and connection of a Grant
‘plug-in’ 7-day timer (ETKIT) and
room thermostat
Pass a 3-core cable (or 3-core and
earth if the room thermostat to be used
has an earth connection) through the
cable clamp on the control panel.
Remove the Orange room thermostat
link wire from terminals 25 & 26 on the
connection block and connect the wires
from the room thermostat. Refer to
Figure 8-5 for further details.
Connect the room thermostat to the
terminal block in accordance with the
room thermostat manufacturer’s
instructions.
Fit and connect the ‘plug-in’ timer as
follows:
1. Remove front and top boiler casing
panels. Loosen (do not remove) the
four screws securing control panel
to the side panels.
2. Hinge the panel forward to access
top and rear of control panel.
3. Remove the two screws and lift off
the terminal block cover from top of
control panel.
4. Remove the Black wire link from
terminals 19 & 20 on control panel.
Do not remove the Red link from
terminals 17 & 18.
5. Carefully push through and remove
square pre-cut 'knockout' section in
the control panel front. Disconnect
and remove the plug from the end
of the wiring harness. Do not
disconnect any of the four wires
from the terminals of the electronic
timer. They must be connected as
shown below.
6. Feed the wires through hole in
control panel front and then up
through rectangular opening in
control panel top. Connect wires to
terminals on control panel as
follows:
• Brown wire (from Terminal 3 on
timer) to Terminal 20 on PCB
plug.
• Brown wire (from Terminal 4 on
timer) to Terminal 19 on PCB
plug.
• Blue wire (from Terminal 1on
timer) to Terminal 21 on PCB
plug.
• Red wire (from Terminal 2 on
timer) to Terminal 22 on PCB
plug.
Refer to Figure 8-5 for the
connection diagram.
7. Locate the electronic timer in the
square aperture in the control panel
front. Secure by pressing in and
turning the two screws (in upper
right and lower left corners) a
quarter turn clockwise.
8. Re-fit terminal block cover on
control box and fasten with the two
screws previously removed.
9. Hinge the control panel back into
position on the two retaining
screws. Replace top casing panels.
10. Re-connect the electricity supply
and check the operation of the timer
and room thermostat.
Refer to the Fitting and User
instructions supplied with the timer
for operating and setting.
Leave the Timer and Room
Thermostat Fitting and User
instructions with the user after
installation.
8 Electrical
123 456 789 101112 13141516 1718 212219 20 23 24 27 2825 26
ENL
N
NL 3
NLON
412
N COM ON
3254 1
COM L N
Grant Plug-in (panel mounted)
Electronic Timer
Grant Ref. ETKIT
Room Thermostat
e.g. Danfoss Randall
RMT230
Frost Thermostat
(if required)
e.g. Danfoss Randall
RET230F
HTG
OFF
HTG
ON
EL
Mains
Ext. Frost Stat
Red
Brown
Brown
Red
Blue
Ext. Frost Stat
Room Stat
Room Stat
Timer Neutral
Timer Live
DHW Timed On
CH Timed On
230V 5A Fused
Supply
Figure 8-5: Connections for Grant 7-day electronic timer (ETKIT) and room thermostat
Boiler Control Panel - PCB Connections
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