System diagram
F1155 consists of heat pump, immersion heater, circula-
tion pumps and control system. F1155 is connected to
the brine and heating medium circuits.
In the heat pump evaporator, the brine (water mixed
with anti-freeze, glycol or ethanol) releases its energy to
the refrigerant, which is vaporised in order to be com-
pressed in the compressor. The refrigerant, of which the
temperature has now been raised, is passed to the con-
denser where it gives off its energy to the heating medi-
um circuit and, if necessary, to any docked water heater.
If there is a greater need for heating/hot water than the
compressor can provide there is an integrated immersion
heater.
Connection, heating medium flowXL1
Connection, heating medium returnXL2
Connection, brine inXL6
Connection, brine outXL7
Connection, hot water heaterXL9
Dimensions and pipe
connections
620
600
560
70
1475
725*
725*
25-50
25
55
130
460
535
405
440
620
600
560
70
1475
725*
725*
25-50
25
55
130
460
535
405
440
Pipe dimensions
12
kW
6
kW
Connection
2822(mm)(XL1)/(XL2) Heating medium flow/re-
turn ext. Ø
2822(mm)(XL9) Connection water heater ext. Ø
28(mm)(XL6)/(XL7) Brine in/out ext. Ø
* Can be angled for side connection.
15Chapter 4 | Pipe connectionsNIBE F1155
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