11
The air supply to and from the Edel heat pump water heater
must NOT extract air from the living space of the dwelling.
The air must be supplied to the appliance directly from the
outside or from another source outside the thermal envelope
of the living space.
The ducting used to connect the air intake and exhaust must
Condensation may result in damage to the appliance and/or
building fabric.
Dimplex does not take any responsibility
for issues caused by poor ducting design
or installation.
Figure 9 provides an example of how the ducting inlet and
outlet connections should be installed.
Dimplex does not take responsibility for
the appliance when installed outside the
scope of the guidelines provided in this
document.
Figure 9: Examples of air connection to the water
6.7 Ducting Design
ducting for correct operation of the appliance. The minimum
drop below 90m
3
/hr.
the system designer calculated the required total quantity
of ducting connections, lengths, bends and terminations to
establish an accurate value for total system pressure drop
Actual Air Flow Rate Maximum Pressure Drop
90 m3/hr 90 Pa
100 m3/hr 75 Pa
110 m3/hr 50 Pa
120 m3/hr 40 Pa
6.7.1 Worked Example
Each ducting component produces a pressure drop that
rates.
Accessories Schema Pressure drop/ typical
air ow
Concentric
air duct
Ø80/125
90m/h 100m/h 140m/h
9 Pa/m 12 Pa/m 23 Pa/m
Accessible
Concentric
Elbow 90°
Ø80/125
90m/h 100m/h 140m/h
24 Pa 30 Pa 65 Pa
Elbow 90°
Ø80/125
90m/h 100m/h 140m/h
24 Pa 30 Pa 63 Pa
Elbow 45°
Ø80/125
90m/h 100m/h 140m/h
19 Pa 23 Pa 47 Pa
For a typical installation, the calculation as presented in
Table 3 is applicable
Table 3: Ducting accessories
Installation
Failure to use the concentric ducting supplied will prevent the
product working properly. Dimplex only recommend using
the ducting supplied and maintaining the shortest possible
duct runs.
The Edel 170 uses a concentric air ducting system (duct-in-
duct) which supplies outside air to the appliances and dis-
charges exhaust air outdoors .The heat pump operates over
a large air temperature range (from -7°C to 35°C) using en-
ergy from outdoor air to produce domestic hot water. It is es-
sential to correctly design and install the air ducting system
to ensure the product operates properly and complies with
regulations.
6.6 Air Connection
NOTE: The calculated worked example includes
all the necessary ducting components to
complete the installation and has result-
ed in a total system pressure drop of 90Pa
-
ceptable as the pressure drop is below the
maximum permissible allowed. Only use
ducting components that have available
pressure drop values.
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