Grant Vortex VTXBH1521, Инструкции по установке и обслуживанию

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8.1 GENERaL
The Vortex Boiler House models requires a ~230V 1ph 50Hz
supply. It must be protected by a 5 Amp fuse.
Refer to Figures 8-1 to 8-2 for typical control system wiring
diagrams for all models.
! WaRNiNG !
the Vortex boiler contains electrical switching equipment
and must be earthed.
The supply must be fused at 5 Amp and there must only be one
common isolator for the boiler and control system, providing
complete electrical isolation.
A fused double pole switch or a fused three pin plug and shuttered
outlet socket should be used for the connection.
The power supply cable should be at least 0.75 mm
2
PVC as
specified in BS 6500, Table 16.
All the wiring and supplementary earth bonding external to
the boiler must be in accordance with the current IET Wiring
Regulations.
Any room thermostat or frost thermostat used must be suitable for
use on mains voltage.
In the event of an electrical fault after installation of the boiler, the
following electrical system checks must be carried out:
• Short circuit
• Polarity
• Earth continuity
• Resistance to earth
8.2 CONNECtiNG tHE pOWER
SUppLY
It is recommended that the boiler should be connected to a
switched mains power supply from an external programmer or
control system. Fit and connect the dual thermostat control as
follows:
1.
First fit the flow pipe (36/46 models only). Refer to Section
5.4. Fit the thermostat phials of the dual thermostat into the
thermostat pockets on the flow pipe. Refer to Figure 5-4.
2. Fit the dual thermostat and bracket (15/21, 21/26, 26/36 and
36/46 models only).
For 46/58 and 58/70 models – the dual thermostat is factory
fitted (refer to Figure 2-6).
3. Undo the three screws securing the dual thermostat cover
and lift off the cover.
4. Withdraw the cable support bushes from the cover. Pass the
burner supply cable through one of the bushes and connect
it to the boiler (control) thermostat (refer to Figure 8-3) as
follows:
• Live (Brown) to terminal 1 on the control thermostat
• Green/Yellow to the earth terminal, marked
⏚
, on the
control Thermostat
• Pass the Earth ‘flying lead’ (Green/Yellow) from casing
through the same bush and connect to earth terminal,
marked
⏚
, on the control thermostat.
5. Pass a switched mains power supply through the other cable
support bush and connect it to the overheat thermostat (refer
to Figure 8-3) as follows:
• Switched live (Brown) to terminal C on the overheat
thermostat
• Earth (Green/Yellow) to the earth terminal (marked
⏚
)
on the overheat thermostat
• An earth link (not supplied) must be fitted between the
earth terminals of the overheat and control thermostats
both marked
⏚.
Refer to Figure 8-3.
• Neutral (Blue) wire from incoming switched mains
supply must be linked to the neutral (Blue) wire to the
burner using a single connector (not supplied).
• A link (not supplied) must be fitted between terminal 2
on the overheat thermostat and terminal C of the control
thermostat
.
Refer to Figure 8-3.
Refer to Figures 8-1 and 8-2 for typical system wiring diagram.
For other systems not covered, contact Grant Engineering (UK)
Ltd.
! WaRNiNG !
DO NOt connect the neutral wires to either of the two
thermostats.
6. There are NO connections to terminal 1 on the overheat
thermostat and terminal 2 on the control thermostat.
7. Position the support bushes so as not to strain the
connections when the cover is replaced. Place the cover in
position locating the bushes at the same time.
! NOtE !
it may be necessary to rotate the thermostat knob to
engage it on the operating spindle as the cover is replaced.
8. Secure the cover in position by tightening the three screws.
Tighten the cable support bush nuts to secure the cables.
9. Ensure that all external wiring is adequately supported. Do
not switch on the electricity supply at this stage.
8.3 FROSt pROtECtiON
For additional protection of either the entire heating system,
or the boiler and localised pipework, it is recommended that
a frost thermostat be installed. Refer to Figures 8-1 to 8-2 (as
appropriate) for connection details.
To protect the heating system, the 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, i.e. in a room with a radiator.
Where the frost thermostat is installed outside the house (to
protect a boiler installed in an external boiler room or garage) or
in an attic, it is recommended that it be used in conjunction with a
pipe thermostat to avoid unnecessary and wasteful overheating of
the property. The pipe thermostat should be located on the boiler
return pipe, and set to operate at 25°C.
Refer to Figures 8-1 to 8-2 (as appropriate) for connection details.
8.4 WiRiNG DiaGRamS
! NOtE !
Earth and some Neutral connections have been excluded
for clarity.
all switches are shown in the closed position.
Section 8: Electrical page 22
8 ELECtRiCaL