Nibe F470 [15/84] Pipe and ventilation connections
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Nibe F470 [15/84] Pipe and ventilation connections

Nibe F470 [15/84] Pipe and ventilation connections
General pipe connections
Pipe installation must be carried out in accordance with
current norms and directives.
The system requires a low-temperature design of the ra-
diator circuit. At lowest dimensioned outdoor temperature
(DUT) the highest recommended temperatures are 55 °C
on the flow line and 45 °C on the return line.
Overflow water from the evaporator collection tray and
safety valves goes via non-pressurised collecting pipes to
a drain so that hot water splashes cannot cause injury.
The entire length of the overflow water pipe must be in-
clined to prevent water pockets and must also be frost
proof.
NOTE
The pipe system needs to be flushed out before
the heat pump is connected so that any debris
cannot damage component parts.
Maximum boiler and radiator volumes
H
The volume of the pressure expan-
sion vessel (CM1) is 10 litres and it
is pressurised as standard to 0.5 bar
((5 mvp). As a result, the maximum
permitted height "H" between the
vessel and the highest radiator is 5
metres; see figure.
If the standard initial pressure in the
pressure vessel is not high enough
it can be increased by adding air via
the valve in the expansion vessel.
The initial pressure of the expansion
vessel must be stated in the inspection document. Any
change in the initial pressure affects the ability of the
expansion vessel to handle the expansion of the water.
The maximum system volume excluding the boiler is 219
litres at the above pre-pressure.
System diagram
F470 consists of a heat pump, water heater, immersion
heater, fans, circulation pump and control system.F470
is connected to the ventilation system and heating medi-
um circuit.
When the exhaust air at room temperature passes
through the evaporator, the refrigerant evaporates be-
cause of its low boiling point. In this way the energy in
the room air is transferred to the refrigerant.
The refrigerant is then compressed in a compressor,
causing the temperature to rise considerably.
The warm refrigerant is led to the condenser. Here the
refrigerant gives off its energy to the boiler water,
whereupon the refrigerant changes state from gas to li-
quid.
The refrigerant then goes via filters to the expansion valve,
where the pressure and temperature are reduced.
The refrigerant has now completed its circulation and
returns to the evaporator.
;/;/;/;/;/
Connection, heating medium flowXL 1
Connection, heating medium returnXL 2
Connection, cold waterXL 3
Connection, hot waterXL 4
Connection, dockingXL 8
13Chapter 4 | Pipe and ventilation connectionsNIBE™ F470
4 Pipe and ventilation connections

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