Technical data
88
CTC EcoZenith i250 
Installation CTC EcoAir 520M
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Settings Heat pump
Compressor: Permitted
Min outtemp °C    -15
Tariff VP    Off
Cold temp limit    0
Max RPS    90
Warm temp limit    20
Max RPS warm temp    50
>>
Heat pump
Compressor  On 65 rps
Charge pump  On 47%
Fan On
HP in/out°C  35.5 / 42.3
Current L1  4.0
Settings Heat pump
<<
Max RPS silent mode    50
Silent mode
HS<>DHW time (sek)    120
Charge pump    50
Auto adj. charge pump
Set. Silent mode
Inst. Ljudreducering
Silent mode  Off
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Silent mode  On  Active
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Förslag Inst. Värmepump
Förslag Inst. Värmepump
Förslag Inst. Värmepump
15.1.2  Heat pump Settings
Compressor Permitted/Blocked 
The product is supplied with a blocked compressor. 
When the compressor is blocked, the product operates 
like an electric boiler. All other functions are intact. 
Permitted means that the compressor is allowed to 
operate.
Min. outdoor temp. °C  -15 (-22...0)
This menu relates to settings for the outdoor temperature 
at which the compressor is no longer permitted to 
operate. When the heat pump has stopped a start signal 
will only be given if the outdoor temperature is at least 
2 °C warmer than the set value. The lowest outdoor 
temperature required for start is -18 °C.
Tariff HP
Must be set to “Off”.
Compressor speed
Limit cold temp. (T2ºC)  0
Temperature limit for winter power. When the outdoor 
temperature is this or lower, the compressor speed is 
adjusted up to speed R2.
Limit warm temp. (T1ºC)  20
Temperature limit for summer power. When the outdoor 
temperature is this or higher, the compressor speed is 
adjusted up to speed R1. The heat pump starts and 
stops at the actual value and setpoint value.
Max. rps warm temp. (R1 rps)  50
Maximum compressor power in warm weather. Sets 
the maximum speed of the compressor at outdoor 
temperature T1
Max. rps (R2 rps)  90
Compressor power in cold weather. Sets the maximum 
speed of the compressor at outdoor temperature T2
The CTC EcoZenith i250 is supplied with suitable factory settings for the CTC EcoAir 520M. 
Enertech AB recommend these for optimal operating economy.
R2
R1
T2
T1
Outdoor ºC
-25 -20 -15 -10  -5  0  5  10  15  20  25  30 
100 
90 
80 
70 
60 
50 
40 
30 
20 
10 
 0
Rps










