Heat Pump Functions - Fujitsu WATERSTAGE WOYG160LJL Maintenance Document

▼ Heat Pump Functions

Line Nr Programming line
2803 Overrun time cond pump
2843 Compressor off time min
2844 Switch-off temp max
2862 Locking time stage 2
2873 Compressor mod run time
2882 Release integr electric fl ow
2884 Release el fl ow at OT
2886 Compensation heat defi cit
2916 Max setpoint HP DHW charg
2920 With electrical utility lock
Overrun time cond pump
When the compressor is switched off , the condenser
pump continues to run for the set overrun time.
Compressor off time min
For the same reason, the compressor remains
switched off for the minimum period of time set here.
Switch-off temperature maximum if the fl ow 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 diff return
temp" below the maximum switch-off temperature and
the minimum off time has elapsed.
Switch-off temp max
If the fl ow or the return temperature exceeds the
maximum switch off temperature, the compressor will
be switched off .
Locking time stage 2
When compressor is restarted, the time which keeps
minimum capacity can be adjusted. Effi ciency becomes
better; however, the time of rising capacity becomes long.
Compressor mod run time
Compressor mod run time means the time of
compressor frequency
minimum to maximum. If this setting value changes to
small, compressor frequency changes more quickly.
Warning
This setting value is too small, the effi ciency is decreased
due to the compressor frequency changes frequently.
- 80 -
indication changed
Release integr electric fl ow
After the release of the 1st stage (heater 1:on, heater 2:off ),
the controller compares the temperature measured
with the point of engagement and forms an integral
and includes a possible defi cit of heat. Once the value
of the integral reaches the maximum value (2882),
the 2nd stage is engaged (heater 1:off , heater 2:control).
The controller continuously compares the temperature
measured at the point of engagement and new features
to the defi cit of heat in the full release.
When the full release reaches the value set (2882),
the 3rd stage of the heater is triggered (heater 1: fi xed on,
heater 2: control).
Flow elec. release at OT
The heater will be activated only if the attenuated
outdoor temperature is below the temperature set here.
Warning
If this setting is too low, there may be a feeling of
discomfort due to the fact that the heat pump is unable
to meet the heating requirements alone at low outdoor
temperatures, and heaters are not switched on.
Compensation heat defi cit
This function compensates for excess heat and heat
defi cits. These can occur in the following situations:
• Minimum compressor on and off times
• In the case of low temperature requests, the fl ow
temperature can lie below the required setpoint, but the
return temperature may not drop below the switchon
oint for a longer period of time. In this situation, the heat
pump must be switched on to prevent heat defi cits.
The controller compares continuously the fl ow temperature
setpoint with the actual value and integrates the surplus
heat and heat defi cits. Diff erences are compensated for
by extending the compressor on and off times.
If the compressor is not switched on or off due to surplus
heat/heat defi cits, the controller displays an appropriate
status message.
This function is not active during the time the DHW
storage tank is charged.
from
The function is not active either in the case of plants
with buff er/(combi) storage tanks.
"Compensation heat defi cit" only acts in heating mode.
The parameter is inactive in cooling mode.
The maximum switch-off temperature is given priority
over the "Compensation" function.
In the case of sudden setpoint changes, both integrals
are cleared.
Behavior in connection with the "Floor curing" function
When activating the "Floor curing" function, the integral
is set to a level representing 1.5 times the predefi ned
value (factory setting). If the current temperature lies at
least 2 K below the required setpoint, the heat pump is
immediately switched on.
If compensation of surplus heat/heat defi cits shall
act "Only with fl oor curing fct", the respective setting
must be selected. This means that the parameter is
deactivated in normal heating mode.
Waterstage / Maintenance Manual / 2105 - EN