Figure 8-4:
Connections for Grant wireless two-channel programmable room
thermostat (RFTKIT)
L1
L2
L3
N
2
3
N
L
1
E
N
230 V 5A fused
mains supply
L
5
4
CH
HW
L
N
E
Boiler isolation plug
Grant RFTKIT
Wiring Base (installed inside building)
HW
ON
CH
ON
23
8.3 Connecting the Controls -
Heating and Hot Water
If control of both the heating and hot
water operation of the boiler is required,
it is recommended to use one of the
following options:
• a Grant ‘wireless’ RF two channel
programmable room thermostat
(Ref. RFTKIT), or
• a Grant two-channel programmer
(Ref. ESKIT) and room thermostat.
If either the RFTKIT or a two-channel
programmer is used with the Vortex
External Combi, the user must be
made aware that if the hot water
channel is left in the OFF position,
hot water may not be available on
demand, and that the primary store
may need to recover before any hot
water is available.
Fitting and connection of
Grant two-channel ‘wireless’
Programmable room thermostat
(rFtKit)
Full Fitting and User instructions are
provided with the Grant wireless RFT
Programmable Room Thermostat kit.
The RF Receiver/switching unit (FM/2)
for the RFT Programmable Room
Thermostat is fitted in a wiring base that
is located within the property. It is wired
directly to the boiler isolation plug,
on the control panel of the External
Combi boiler. Refer to Figure 8-4 for
connection details.
To connect the FM/2 receiver unit to
the boiler, proceed as follows:
1. Remove the boiler front casing
panel.
2. All electrical wiring is made to the
Boiler Isolation plug – located at the
left hand end of the boiler control
panel.
3. Pull the plug to the left to remove it
from the socket.
4. Remove the two screws and prise
off the cover from the plug to gain
access to the terminals.
Pass the cable from the FM/2
wiring base through the cable
clamp on the underside of the
control panel before making
connections to the plug.
5. Connect the four wires from the
FM/2 wiring base to the boiler
isolation plug. Refer to Figure
8-4 and also the Fitting and User
Instructions supplied with the
RFT kit.
6. Connect the mains earth to the
earth terminal on the boiler isolation
plug – refer to Figure 8-4.
There must be NO connection made
from terminal 4 on the FM/2 unit
7. Replace the cover on the plug and
secure with the two screws.
8. Measure a maximum of 350mm of
cable between the plug and cable
clamp, then tighten cable clamp to
secure the cable.
9. Re-fit the isolation plug into the
socket in the control panel.
10. Re-connect the electrical supply
and check the operation of the
controller. Refer to the Fitting and
User Instructions provided for the
setting and operation of the RFT
Programmable Room Thermostat.
!
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!
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Leave the Twin-channel
Programmable Room Thermostat
Fitting & User instructions with the
user after installation.
!
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