Supply air battery
The water flow through the supply air coil is set by means
of a trim valve (RN1). This valve must be adjusted to
prevent unnecessary energy consumption in the accom-
modation. The additional output is determined according
to the diagram below. The supply air temperature must
be approximately the same as the indoor temperature,
preferably a few degrees lower.
TIP
Post-adjust the trim valve on a cold day.
0 50 100 150
Tillufts-
flöde
m³/h
200 250
12345
Tryckfall
värmesystem-/
batterikrets
mvp
Avgiven
effekt
Vatten-
flöde
Fullt
öppen
1
2
3
7
100
200
300
400
l/h
-35
-25
-30
-20
4
2
1
DUT
55/45
3
kW
Trimventilinställning
(Antal öppnade varv)
35/25
-35
-30
-25
-20
-15
-15
DUT
Supply air
flow
m³/h
mvp
Pressure drop
radiator-/
coil circuit
Trim valve setting
(Number of opening turns)
Water
flow
Fully
open
DUT
l/h
kW
The delivered output in the diagram is calculated when dimensioning the heating system 55/45°C respective 35/25°C (underfloor
heating).
Rated
power
Risk of low supply
air temperature
Example: If the supply flow is regulated to 150 m³/h and
DOT is -20 °C at a pump pressure (= pressure drop coil
circuit) of 3.3 mvp (33 kPa), gives the setting 2.8 on the
trim valve.
This means that the trim valve must be opened 2.8 turns
from closed position. At the same time it can be read
that the coil supplies the supply air with approximately
3 kW of additional output at -20 °C.
NOTE
Vent the coil using the venting screw (QM21)
repeatedly in order to ensure the circulation
through the coil.
Commissioning without fans
The heat pump can be run without recovery, as only an
electric boiler, to produce heat and hot water, for ex-
ample before the ventilation installation is complete.
Enter menu 4.2 - "op. mode" and select "add. heat only"
Enter menu 5.1.5 - "fan sp. exhaust air" and reduce the
fan speed to 0%. Also go to menu 5.1.6 - "fan sp. supply
air" and reduce the fan speed on the supply air fan to
0%.
NOTE
Select operating mode "auto" or "manual" when
the heat pump is to run on recovery again.
35Chapter 6 | Commissioning and adjustingNIBE F470
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