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8.2
COnnECtinG thE COntROLS -
hEatinG OnLY
To control the central heating on/off periods only (and not
the domestic hot water), it is recommended to use one of the
following options:
•
A remote single channel timer and room thermostat.
•
A 'plug-in' Grant Mechanical 24-hour timer (product code:
MTKIT) and room thermostat.
•
A programmable room thermostat.
With any of these options the timer, room thermostat or
programmable room thermostat should be sited at a suitable and
convenient location within the property.
COnnECtiOn Of an EXtERnaL REMOtE tiMER
anD ROOM thERMOStat
! WaRninG !
any remote timer must be of a single channel 230V type
with voltage free output contacts.
1.
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.
2.
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 8-3 for further details
3.
Connect the room thermostat to the terminal block in
accordance with the room thermostat manufacturer's
instructions.
4.
Pass a 4-core cable (or 4-core and earth if the timer to be
used has an earth connection) through the cable clamp on
the control panel.
5.
Remove the black link wire from terminals 19 & 20 on the
connection block. Connect the two switch wires from the
timer.
6.
Connect the live, neutral (and earth if required) from the timer
to terminals 3, 2 & 1 respectively on the boiler terminal block.
Refer to Figure 8-3 for further details.
7.
Re-fit terminal block cover on control box and fasten with the
two screws previously removed.
8.
Hinge the control panel back into position on the two
retaining screws.
9.
Replace top casing panels.
10. Re-connect electrical supply and check operation of the timer
and room thermostat.
11. 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.
Section 8: Electrical
fittinG anD COnnECtiOn Of a GRant 'pLUG-in'
24-hOUR tiMER (MtKit) anD ROOM thERMOStat
1.
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.
2.
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 8-4 for further details.
3.
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. Hinge the panel forward to access top and rear of
control panel.
2.
Remove the two screws and lift off the terminal block cover
from top of control panel.
3.
Remove the four screws from the rear of the control panel
and remove the rear access cover.
4.
Remove the Black wire links from terminals 19 & 20 on
control panel.
5.
Carefully push through and remove square pre-cut 'knockout'
section in the control panel front.
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:
8.3
COnnECtinG an EXtERnaL
fROSt thERMOStat
The boiler is fitted with a pre-set internal frost protection
thermostat. Should either the air temperature around the boiler, or
the water temperature within the boiler, fall to below 5°C then this
thermostat will be activated to protect the boiler from freezing.
If necessary, to protect any exposed heating system and any
exposed pipework, an external frost thermostat can also be
connected to the boiler.
This frost thermostat should be sited within the house in such
a place that it can detect any rise and fall in the ambient air
temperature, such as, in a room with a radiator. It is connected to
the boiler as follows:
1.
Connect the wires from the frost thermostat to terminals 23
& 24 on the connection block. Refer to Figure 8-3 for further
details.
2.
Connect the frost thermostat in accordance with the frost
thermostat manufacturer's instructions.
This external frost thermostat will operate in parallel
page 25
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