11
Apart from the space indicated in paragraph 5.1, the heat pump requires adequate ventilation.
It is necessary to create a dedicated air duct as indicated in the illustration (Fig. 5).
Moreover, it is important to ensure an adequate ventilation of the premises where the equipment is to be installed.
An alternative solution is indicated in the following illustration (Fig. 5a): this consists of a second duct that draws air in from outside
instead of directly from inside the premises.
Both, intake and exaust air are taken and expelling outside the house (building). Air duct diameter of 160mm should be used.
The maximum allowable pressure drop of 88 Pa must be assured. In regards to this, precise air duct length must be calcu
-
lated as described below:
Carry out the installation of each air duct taking care that:
•
The weight of such, does not adversely affect the equipment itself;
•
Maintenance operations can be carried out;
•
This is adequately protected so as to avoid the accidental intrusion of material inside the equipment itself;
•
The maximum total allowable pressure drops for all components, including through holes for mounting on external wall,
within the pipe system must not exceed 88 Pa.
All Technical parameters shown in the table above, are guaranteed at air flow rate 360 m3/h at pressure
88 Pa. So please keep the following rules:
1. Use airduct pipe system with diameter Ø160mm
2. Maximum length of both, inlet and outlet straight pipes, must not exceed 16 meters. See Fig. 6c!!!
3. 1m straight pipe has pressure drop of ~2 Pa at 260 m3/h; PVC material; dry air T=7°C
4. Each elbow 90o has pressure drop of ~28 Pa at 260 m3/h; PVC material; dry air T=7°C
5. Elbow 45o has pressure drop of ~12 Pa at 260 m3/h; PVC material; dry air T=7°C
Examples:
•
Three elbows 90°(3 x 28Pa = 84Pa) + four pieces 0.5m straight pipes
(4 x 0.5m x 2Pa = 4Pa) = total 88Pa
•
Two elbows 90°(2 x 28Pa = 56Pa) + two pieces 4m straight pipes
(4 x 4m x 2Pa = 32Pa) = total 88Pa (Fig.6c)
During operation, the heat pump tends to lower the ambient temperature if the external air duct is not
carried out.
An appropriate protection grid must be installed in line with the discharge pipe conveying air to the
outside with the aim of avoiding foreign bodies from entering the equipment. In order to guarantee maxi-
mum device performance, the grid chosen must ensure low pressure loss.
In order to avoid the formation of condensate: insulate the air discharge pipes and the air duct cover
connections with steam-tight thermal cladding of an adequate thickness.
If it is considered necessary in order to prevent flow noise, sound mufflers can be mounted.
Fit the pipes, the wall through holes and the connections to the heat pump with vibration damping sys
-
tems.
WARNING! the simultaneous operation of an open-flue firebox (e.g. an open-flue fireplace) together with
the heat pump causes a dangerous environmental pressure drop. This could cause the backflow of ex
-
haust gas into the environment itself.
Do not operate the heat pump together with an open-flue firebox.
Use only sealed-chamber fireboxes (approved) with a separate duct for combustion air.
Keep the doors to the boiler room closed and hermetically sealed if they do not have a combustion air
supply in common with inhabited areas.
5.2.
Ventilation connection
Summary of Contents for HPWH 3.1 200 U02
Page 2: ......
