Nibe S1255PC - Setting the Cooling;Heating Curve

Heating medium side
S1255PC has a heating medium pump that can be con-
trolled automatically. For manual operation, deactivate
"Auto" in menu 7.1.2.2 and then set the speed according
to the diagrams below.
The flow must have a suitable temperature difference
for the operating case (heating operation: 5 - 10 °C, hot
water generation: 5 - 10 °C, pool heating: approx. 15 °C)
between controlling supply temperature sensor and re-
turn line sensor. Check these temperatures in menu 3.1
"Operating info" and adjust the heating medium pump
(GP1) speed until the temperature difference is attained.
A high difference indicates a low heating medium supply
and a low difference indicates a high heating medium
supply.
Read off what speed the heating medium pump should
have during manual operation from the diagrams below.
Available pressure, kPa
Electrical output, W
0
0,0
0,05 0,10 0,15 0,20 0,25 0,30 0,45
10
20
30
40
50
60
Tillgängligt tryck, kPa
Eleffekt, W
Flöde l/s
P100%
P80%
P60%
P40%
Tillgängligt tryck, kPa
Eleffekt, W
1
2
3
4
70
80
0,35 0,40
p
S1255PC 6 kW
100%
80%
60%
40%
0
20
10
40
30
60
50
70
80
(kPa)
0 0,05 0,1 0,20,15 0,25 0,30 0,35 0,40
Flöde
(l/s)
P100%
P80%
P60%
P40%
0
50
30
40
20
10
60
70
80
(W)
Available pressure
Flow
Output
Readjusting, venting, heat medium side
Air is initially released from the hot water and venting
may be necessary. If gurgling sounds can be heard from
the heat pump or climate system, the entire system will
require additional venting.
Readjusting, venting, collector side
Level vessel
2/3
LEK
LEK LEK
2/3
LEK
Gamla bilder, med säkerhetsventil på nivåkärlet
1/3
1/3
Check the fluid level in the level vessel
(CM2). If the fluid level has dropped, top
up the system.
1.
Close the valve under the vessel.
2.
Disconnect the connection on top of
the vessel.
3.
Fill with brine until approx 2/3 of the
vessel is full.
4.
Reconnect the connector at the top of
the vessel.
5.
Open the valve under the vessel.
If the pressure in the system needs to be raised, this is
done by closing the valve on the outgoing main line
when the brine pump (GP2) is in operation and the level
vessel (CM2) is open, so that liquid is drawn down from
the vessel.
Expansion vessel
LEK
If a pressure expansion vessel (CM3) is
used instead of a level vessel, the pressure
level is checked. If the pressure drops, the
system should be replenished.
Setting the
cooling/heating curve
In the menus Curve, heating and Curve, cooling , you
can see the heating and cooling curves for your house.
The task of the curves is to give an even indoor temper-
ature, regardless of the outdoor temperature, and
thereby energy-efficient operation. It is from these
curves that the S1255PC determines the temperature
of the water to the climate system (the supply temper-
ature) and thus the indoor temperature.
CURVE COEFFICIENT
The slopes of the heating /cooling curves indicate how
many degrees the supply temperature is to be in-
creased/reduced when the outdoor temperature
drops/increases. A steeper slope means a higher supply
temperature for heating or a lower supply temperature
for cooling at a certain outdoor temperature.
29Chapter 6 | Commissioning and adjustingNIBE S1255PC