The Compressor's Speed Change; Compressor Start; Start Procedure For The Compressor - Nibe F2040 Technical Manual

The compressor's speed change

The compressor's greatest speed change is 6 rps/30 sec.

Compressor start

The compressor restarts if the following conditions are
met:
The inner unit sends start signals.
■
More than three minutes have passed since the
■
compressor was stopped.
The compressor's speed is calculated by the connected
indoor unit which requests the necessary output.
Upon first start-up in heating operating mode, after
the current has be switched on, the outdoor unit delays
the compressor start by 30 minutes, to prevent oil being
drained from the compressor.
During the delay, "Protection" appears in menu 5.0.

Start procedure for the compressor

Process 1
The compressor usually starts with process 1.
The compressor starts at a speed of 30 rps and attempts
to meet a target speed of "55 rps" with a speed increase
of 5 rps / 5 sec.
Defrosting stops when the pressure difference exceeds
0.34 MPa in heating operation.. In cooling operation
it is stopped when the low pressure is 0.8 MPa. When
the pressure difference is achieved the target speed is
changed to "A" rps and maintained for "B" minutes.
State
Cooling mode
Heating mode
18 Chapter 4 | Description of functions
A rps B min
20 4
55 2
Process 2
First start after the heat pump has been powerless.
The compressor starts at a speed of 30 rps and attempts
to meet a target speed of "55 rps" with a speed increase
of 5 rps / 5 sec.
Defrosting stops when the pressure difference exceeds
0.34 MPa in heating operation.. In cooling operation
it is stopped when the low pressure is 0.8 MPa. The
compressor then holds "A rps" for "B min".
State A rps
Cooling mode 30
Heating mode 30
Process 3
If both the following conditions are met:
Restart of the compressor in heating operation if the
■
compressor has been stopped for 2 hours or more.
Ambient temp. at restart is lower than 0 °C.
■
The compressor starts at a speed of 30 rps and attempts
to meet a target speed of "55 rps" with a speed increase
of 5 rps / 5 sec.
Defrosting stops when the pressure difference exceeds
0.34 MPa in heating operation.. In cooling operation
it is stopped when the low pressure is 0.8 MPa. The
compressor then holds "A rps" for "B min".
State A rps
Heating mode 40
B min
10
10
B min
15
NIBE™ F2040