Control; Description Of Functions - Nibe HPAC 28 Instrucciones De Instalación Y Mantenimiento

GB
28
The cooling supply to the building is controlled in accor-
dance with the preset curve slope in menu 2.9.1. After
adjustment, the correct amount of cooling for the current
outdoor temperature is supplied to the building. The
HPAC flow temperature will hover around the theoreti-
cal required value (the value in parentheses in menu
2.0). In the event of excess temperature the FIGHTER
1120/1220 calculates a surplus in the form of degree-
minutes, which means that the greater the excess tem-
perature that temporarily prevails, the more the connec-
tion of active cooling production is accelerated.
FIGHTER 1120 HPAC automatically switches to cool-
ing mode when the outdoor temperature exceeds the
value set in menu 2.9.3. Passive cooling is always
activated for less than 5 minutes first. If this is not suf-
ficient to maintain the desired temperature in the sup-
ply line, active cooling is switched on.
Passive cooling means that the FIGHTER 1120/1220,
with the aid of the circulation pumps, circulates fluid
from the ground/rock collector through the building's
distribution system and cools the building. In passive
cooling mode, "PC" is shown on the heat pump display.
When the cooling requirement is too great for passive
cooling to manage, i. e. if the degree-minutes have
reached the start level, or the preset limit value in
menu 2.9.4 has been reached, active cooling is
switched in. The compressor then starts and the
resulting cold medium circulates to the building's distri-
bution system and the heat circulates out to the
ground/rock collector. In this mode, "AC" is shown on
the heat pump display.
Once the heat pump has started producing active
cooling, there will be a delay of 2 hours before passive
cooling can begin, unless the compressor is needed.
Once the heat pump has entered a cooling mode, heat
cannot be generated in less than 3 hours.
Quick guide – menu settings for cooling
Menu 8.1.1 Operation mode types
The desired menu type is selected here: Normal,
Extended or Service.
Select Service to gain access to all the menus.
Menu 9.2.16 Cooling system
The type of cooling system is selected here. It
can be set to "HPAC" or the Off position. The fac-
tory setting is Off.
Menu 2.3 Flow Temp./MIN
The lowest permitted supply temperature is
selected here. The value is adjustable between 2
and 65 °C. The factory setting is 15 °C.
The recommended minimum setting in the case
of a floor loops distribution system is 18 °C.
Menu 2.9.1 Cooling curve
The curve slope (cooling curve) is selected here.
The value can be set between curves 1 and 3.

Control

Description of functions

During heat production, there is a 2 degree wait until
the preset starting temperature for cooling is reached
(menu 2.9.3).
Three different cooling curves can be selected, refer to
the illustration for more details.
Calculated flow
temperature
°C
If a room sensor (RG 10) is connected, cooling begins
at 1 degree of excess temperature in the room, and
the supply line set point is set to the minimum supply
line temperature (menu 2.3). The actual and required
room temperatures are shown in menu 6.0. When the
room temperature has fallen to 0.5 degrees of excess
temperature, the cooling is switched off. To prevent
hunting in the heating system, there is a neutral zone
of 0.5 degrees between heating and cooling opera-
tions. Heat production is only permitted up to the
desired room temperature. If the temperature is higher
than this, the heating is switched off.
HPAC 28
Beräknad
framledningstemp.
20
15
10
5
0
0 20
The factory setting is 2.
Menu 2.9.2 Offset cold curve
The cooling curve offset is selected here. The
value can be set between -10 and +10. The fac-
tory setting is 0.
Menu 2.9.3 Start temp. cooling
Here you select at what outside temperature
cooling shall be activated. The value is
adjustable between 20 and 40 °C. The factory
setting is 25 °C.
Menu 2.9.4 Diff Passive/Active
If the flow temperature at the sensor (FG)
exceeds the calculated flow temperature + this
value the system switches to active cooling. The
value is adjustable between 1 and 9 °C. The fac-
tory setting is 4 °C.
k=1
k=2
k=3
Utetemp.
Outside
temp.
30 40 °C