Heat Pump Functions - Fujitsu Super High Power Series Design & Technical Manual

3-8. Heat pump functions

Line Access
2803 S Overrun time condenser pump
2843 S Compressor off time minimum
2844 S Switch-off temperature maximum
2862 S Locking time stage 2/mod
2873 S Compressor mod run time
2882 S Release integral electric flow
Release electric flow below OT
2884 S Electrical release - start-up with
outside temperature
2916 S Maximum setpoint HP DHW charge
S With electrical utility lock (EX1)
Released: HP = ON _ Back-up DHW = off _ 1st back-up HP = off _ 2nd back-up HP = off _ Boiler =
2920
ON
Locked (Blocked on standby): HP = off _ Backup DHW = off _ 1st backup HP = off _ 2nd backup
HP = off _ Boiler = ON
• Overrun time condenser pump
When the compressor is switched off, the condenser pump continues to run for the set overrun
time.
• Compressor off time minimum
For the same reason, the compressor remains switched off for the minimum period of time set
here. Switch-off temperature maximum if the flow or the return temperature exceeds the maximum
switch-off temperature, the compressor will be switched off. The heat pump is switched on again
when the temperature at both sensors has dropped by the "Switching difference return tempera-
ture" below the maximum switch-off temperature and the minimum off time has elapsed.
• Switch-off temperature maximum
If the flow or the return temperature exceeds the maximum switch off temperature, the compressor
will be switched off.
Example (line 2844): Floor heating system = 55°C (Higher temperature radiator = 65°C)
• Locking time stage 2
When compressor is restarted, the time which keeps minimum capacity can be adjusted. Efficien-
cy become better, however the time of rising capacity becomes long.
• Compressor mod run time
Compressor mod run time means the time of compressor frequency indication changed from mini-
mum to maximum. If this setting value changes to small, compressor frequency changes more
quickly.
WARNING
If this setting value is too small, the efficiency is decreased due to the compressor frequency
changed frequently.
3-8. Heat pump functions
Function
8...240 s
0...120 min
8...100°C
0...40 min
10...600 s
0...500°Cmin
-30...30°C
8...80°C
Locked (Blocked on standby),
Released
- (03-35) -
Setting range or display
Factory
setting
240 s
8 min
75°C
5 min
240 s
100°Cmin
2°C
58°C
Released
3. Function table