10
Installation
It is essential to maintain a minimum air flow rate
through the ducting for correct operation of the appli-
ance. The nominal mass flow rate must be maintained
above 320m
3
/hr.
For the fan to operate in Fan speed 1, the maximum sys-
tem pressure drop across the ducting connections must
not exceed 100Pa and for Fan speed 2 the maximum
pressure drop must not exceed 260Pa
6.7 Ducting Design
The heat pump operates over a large air temperature
range (from -7°C to 35°C) using energy from outdoor
air. It is essential to correctly design and install the air
ducting system to ensure the product operates properly
and complies with regulations.
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 di-
rectly from the outside or from another source outside
the thermal envelop of the living space.
The ducting used to connect the air intake and exhaust
must be sufficiently insulated to prevent condensation
forming. Condensation may result in damage to the ap-
pliance and/or building fabric.
Dimplex does not take any responsibil-
ity for issues caused by poor ducting
design or installation.
Figure 7 provides an example of how the ducting inlet
and outlet connections should be installed.
6.6 Air Connection
Figure 7: Examples of air connection to the water heater
Item
Qty
∆P [Pa]
Total [Pa]
Air Intake
2m straight
X 5
4.8
24.0
90°bend
X 3
12.5
37.5
External terminal
X 1
51.0
51.0
Air Exhaust
2m straight
X 4
4.8
19.2
90°bend
X 2
12.5
25.0
External terminal
X 1
51.0
51.0
Total System Calculated Pressure Drop @ 320m
3
/
hr
207.7 Pa
6.7.1 Worked Example
- The pressure drop information provided is for
160mm semi rigid Ubbink ducting, other ducting
manufacturers components may be used howev-
er the total maximum pressure drop must not ex-
ceed the stated values.
Figure 6: Air intake and Air discharge
A ducting system with the following;
Note:
-The calculated worked example includes all the
necessary ducting components to complete the in-
stallation and has resulted in a total system pres-
sure drop of 207.7 Pa at 320m
3
/hr mass air flow
rate. This is acceptable as the pressure drop is be-
low the maximum permissible allowed.
NOTE: The system reliability and efficiency will be
compromised should the mass air flow rate drop be
-
low 320m
3
/hr.
During the product specification stage, it is essential that
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
based on the system air flow rate requirements.
Table 3: Worked example
Fan speed 1 will operate when the
system pressure drop is minimal as a
result of very short duct runs. System
efficiency will be slightly increased and
the noise level slightly reduced.
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Dimplex does not take responsibility for
installation and the operating efficiency
of the appliance when installed outside
the scope of the guidelines provided in
this document.
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