Section 11: Domestic Hot Water
Page 38
11.1 Temperature Control
There must only be ONE demand, for either heating (CH) or
hot water (HW), on the VortexAir hybrid at a time. In all cases,
the DHW demand MUST not clash with the CH demand,
i.e. set the programmer such that the HW ON period(s) are
different from the CH ON period(s) and do not overlap each
other.
!
WARNING
There are three options for the control of domestic hot water
production using the Grant VortexAir hybrid.
These are as follows:
11.1.1 S-Plan type system (with standard cylinder)
With this system, the hot water can be heated to 60°C (in either the
existing cylinder or a new cylinder) using the oil boiler only. The heat
pump is not used to heat the hot water.
A heat pump cylinder, with a larger primary coil, is NOT required
when using this hot water control option.
The system uses a standard ‘S-Plan’ type wiring arrangement with a
two channel programmer, room thermostat, heating zone valve, hot
water zone valve, cylinder dual thermostat and wiring centre. Refer
to Section 12, Figure 12-7.
With this hot water control system, the boiler of the VortexAir
hybrid unit will operate to heat the hot water cylinder
irrespective of whether the Oil/Hybrid switch is set to ‘Oil’ or
‘Hybrid’. However, the Oil/Hybrid switch MUST be set to ‘Oil’
for the boiler of the VortexAir hybrid unit to provide heating in
response to a CH demand.
NOTE
!
The first stage temperature (R1) on the Boiler Control
Thermostat must be set to 0°C when commissioning the
VortexAir hybrid. Refer to Section 17.6 of these Installation
Instructions for details of setting procedure.
NOTE
!
Boiler only installations (heat pump not yet installed)
This hot water control system will still operate to heat the hot water
cylinder, even when only the boiler is installed (i.e. with no heat
pump either installed or connected); provided the Oil/Hybrid switch
on the hybrid control panel is set to ‘Oil’. Refer to Section 14 for
control panel details.
11.1.2 S-Plan type system with Grant Automatic DHW Boost
Kit 2
(with heat pump cylinder)
With this system, the hot water can be heated to 50 - 55°C (in a heat
pump cylinder) using the heat pump only.
A Grant heat pump cylinder, with a larger primary coil, MUST be
fitted when using this hot water control option.
This system uses the standard ‘S-Plan’ type wiring arrangement with
a two channel programmer, room thermostat, heating zone valve,
hot water zone valve, cylinder dual thermostat, wiring centre and a
11 Domestic Hot Water
Grant Automatic DHW Boost Kit 2. Refer to Section 12, Figure 12-8
for wiring details.
The Automatic DHW Boost Kit 2 allows the cylinder immersion
element to be used to raise the temperature to 60°C to sterilise the
cylinder against Legionella. Refer to Section 11.2 – Legionella.
For further details of the Grant Automatic DHW Boost Kit 2 (Grant
product code: HPDHWBK2) refer to Section 11.3.
For this system to operate, the existing immersion switch
must be left set permanently to ON. To totally prevent
operation of the immersion element, the existing immersion
switch must be set to OFF.
NOTE
!
There must be a demand from the HW channel of the heating/
hot water programmer for the Automatic DHW Boost Kit 2 to
operate when required. When setting the ON period(s) on the
Auto Boost Kit 2 timeswitch, ensure that they are within a HW
ON period on the programmer.
NOTE
!
With this hot water control system, the heat pump of the
VortexAir hybrid unit will NOT operate to heat the hot water
cylinder, in response to a DHW demand, unless the Oil/Hybrid
switch is set to ‘Hybrid’.
NOTE
!
Boiler only installations (heat pump not yet installed)
This hot water control system will NOT operate to heat the hot water
cylinder, in response to a DHW demand, when only the boiler is
installed (i.e. with no heat pump installed and connected).
A
temporary
change MUST be made to the control system
connections at the Heating system controls terminal block (in the
hybrid control panel) in order for the hot water heating function to
operate. Refer to Section 12.3.2 for details.
As the boiler will be able to heat the cylinder to 60°C it will not
be necessary for the Automatic DHW Boost Kit 2 to operate
the immersion element whilst the DHW controls are temporarily
connected in this way. Thus, the immersion switch MUST be set to
OFF.
As soon as the heat pump is installed and connected to
the boiler, this temporary change to the control system
connections MUST be reversed. Refer to Section 12.3.2 for
details.
!
CAUTION
11.1.3 S-Plan type System with Grant digital two-stage
cylinder thermostat (with heat pump cylinder)
With this system, the hot water temperature can be switched
between two pre-set temperatures, as follows:
Summary of Contents for Aerona3 Series
Page 57: ...Section 13 Flue System and Air Supply Page 57 Figure 13 8 Flue clearances...
Page 77: ...Section 19 Spare Parts Page 77 Figure 19 4 15 21kW baffles Figure 19 5 21 26kW baffles...
Page 84: ...Appendix A Page 84 Appendix A...
Page 85: ...Appendix A Page 85...
Page 86: ...Appendix A Page 86...
Page 87: ...Appendix A Page 87...
