Normal
11
13
16
17
(°C)
A rps
B rps
Heating mode
Outdoor temperature
Speed AMS
10-12/-16
(rps)
Speed AMS
10-8 (rps)
State
0
0
A1
Cooling mode
+15
+15
A2
0
0
A3
Heating mode
+10
0
A4
+20
+10
A5
+30
+20
A6
Cooling mode
Heating mode
A2
A1
5
10
Outdoor temperature
A6
-20
-18
-10
-8
0
2
A5
A4
A3
Outdoor temperature
THE COMPRESSOR'S SPEED CHANGE
The compressor’s greatest change in speed is
6 rps/30 sec. Above 100 rps, the change in speed is
2 rps/30 sec. (applies to AMS 10-8).
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 AMS 10 which
requests the necessary output.
At first start-up in heating operating mode, after the
current has been switched on, the outdoor unit will delay
the compressor start by 30 minutes in order to prevent
oil being drained from the compressor.
During the waiting period, the text "protection" or "pro-
tection mode" may be presented in the indoor module’s
display (does not apply to AMS 10-6).
START PROCEDURE FOR THE COMPRESSOR
Process 1
The compressor usually starts with process 1.
The compressor starts with the speed in “A rps”.
Certain conditions change the start speed to “C rps”:
• In cooling operation, when the outdoor temperature
(Tho-A) is greater than 35 °C.
• In heating operation, when HM in (BT3) is 48 °C or
higher*.
Between
7 and 9
minutes
Between
3 and 7
minutes
Between
0 and 3
minutes
Time from
start
State
C rps
B rps
A rps
120
120
120
Speed
AMS 10-6
Cooling
mode
120
120
120
Speed
AMS 10-6
above
0° C
Heating
mode
75
56
48
Speed
AMS 10-6
below
0° C
C rps
B min
A rps
State
-
4
20
Speed
AMS 10-8
Cooling
mode
30
4
55
Speed
AMS 10-
12/-16
-
4
40
Speed
AMS 10-8
Heating
mode
30
2
55
Speed
AMS 10-
12/-16
* For AMS 10-8, compressor revving stops when the
pressure difference is greater than 0.34 MPa. In cooling
operation, it stops when the low pressure is 0.8 MPa.
17
Chapter 4 | Description of functions
NIBE AMS10
