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ⓘ
IMPORTANT: Make sure prior to the installation that permissions have been granted by the local authority building
control department for the installation
3.1 SYSTEM COMBINATIONS
ᘐ
WARNING: Failure to comply with this
documentation will lead to increased risk of injury or
death to persons, or damage to the product or property.
ⓘ
IMPORTANT: Any combinations of the products
that are not listed below are outside of the scope of this
document and are not covered under warranty and are
excluded from liability.
The available product combinations are:
•
Logic Air + Logic Air Control Box + Pre-Plumbed Standard
Cylinder (Single Zone or Twin Zone with LL)
•
Logic Air + Logic Air Control Box + Pre-Plumbed Slimline
Cylinder (Single Zone or Twin Zone with LL)
•
Logic Air + Logic Air Control Box + Pre-Plumbed DHW
Cylinder with Integrated Buffer Tank.
3.2 PRIMARY HEATING SYSTEM REQUIREMENTS
To safeguard correct function of the system it must be made
sure that the system operates within the specification outlined
in Table
8.
Table 8 System Specification
Maximum System Operating Pressure (bar)
Minimum System Pressure (bar)
Expected System Pre-charge (bar)
Design Flow Rate (l/min)
Minimum Flow Rate (l/min)
Maximum Water Temperature (°C)
Minimum Water Temperature (°C)
*
Minimum Pipe Size (ø)
Minimum System Filter Mesh Size (µ)
Minimum Water Volume (L)
*
Consideration of the internal diameter of selected pipework must be taken
into account when calculating the system resistance and water velocities
at the specified design flow rates.
ᘐ
WARNING: It is the responsibility of the installer to
make sure that the correct safety and function devices
are installed to the heating system.
ᘐ
CAUTION: The system pipework must be designed
and installed to achieve the correct Design Flow Rate.
Failure to achieve the correct design rate will lead to poor
performance and efficiency.
ᘐ
CAUTION: The system flow rate must be guaranteed
to be above the minimum flow rate requirement in all
operating modes, taking care when the installation
includes thermostatic / electronic control valves. When
the appliance is operating in Frost Protection mode, the
primary circulator pump will operate at a reduced speed
and volume (70% PWM signal), therefore this must be
taken into consideration. If the minimum flow rate of the
system is not maintained at all times, the Heat Pump will
not operate. The water velocity in the pipe should be kept
within limits of material to avoid erosion, corrosion, and
excessive noise generation.
Installation and Maintenance
Section 3 - Pre-Installation Checks
4 kW
5 KW
8 kW
10 kW
3.0
0.5
1 to 1.5
11.5
14.3
22.9
28.7
8.5
14.5
60
17
22 mm
28 mm
800
24
40
•
Logic Air + Logic Air Control Box (wall mounted).
•
Logic Air + Logic Air Control Box + Heat Pump DHW Cylinder
•
Logic Air + Logic Air Control Box + Buffer Tank
ᘐ
WARNING: System schematic diagrams in this
document are meant for reference only. It is the
responsibility of the installer to make sure that all
appropriate safety and function devices are implemented.
Refer to Appendix 1.2 for System Schematic & arrangement
details.
ⓘ
IMPORTANT: Added resistance in the hydronic
circuit will result in the reduction of the overall system
efficiency. To reduce resistance, as few bends must be
used as possible and swept bends are to be used where
practical. The cross-sectional area of the pipework must
be maintained and meet the minimum size.
3.2.1 Minimum System Volume of the Primary
Heating Circuit
ᘐ
CAUTION: A minimum free system volume of 40L
for the 8/10 kW and 24L for the 4/5 kW must be available
to the Heat Pump at all times. This ensures that the Heat
Pump does not cycle excessively and is able to defrost
completely. Failure to adhere to this requirement will
result in inefficient operation of the Heat Pump and the
potential for nuisance faults.
Free volume shall be considered as any part of the system
with un-valved sections of pipework and radiators without
Thermostatic Radiator valves (TRV).
If the minimum free volume cannot be met this will need to
be increased. This can be achieved with the addition of a
volumiser or buffer vessel.
3.2.2 System Expansion
ᘐ
WARNING: Failure to appropriately protect against
system expansion may lead to catastrophic failure of the
system circuit, major property damage and serious harm
to dwelling inhabitants. It must be made sure that it is
impossible to isolate the expansion vessel from the system.
Refer to BS EN 12828 - Heating systems in buildings - Design
for water-based heating systems; when determining the
accurate size of the Expansion Vessel . It must be made
sure that the installed expansion vessel is large enough to
accommodate the system volume.
If glycol is used a correction factor should be applied to
account for higher coefficients of expansion.
23
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