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•
Screen Gg05 set up CH/HP in manual “MAN” and set up the
rps (60). Now turn on the heat pump (Mode ON) and wait for
some minutes until the compressor icon appears in the lower
left.
WARNINGS!
During manual operation, probe B3 is ignored. If the functions
setted in manual (MAN) during the running are not set back in
automatic (AUTO) at the end, the heat pump will continue to
work until it causes a high pressure alarm.
Verify the proper operation:
•
Access to menu “D. inputs/outputs” to control the different
temperatures from sensors
•
Screen D01: B1 it shows il valore of liquid sub-cooling
in the heat pump, it has to stay in a range between 3
and 4, once achieved 35°C of water (see B7). If the hp is
started up during the hot season, for the check of sub-
cooling set up the fan speeds (Menu G. Assistance --˃
g. Manual management --˃ G. Assistance --˃ g. Manual
management --˃ SERVICE PASSWORD --˃ Screen Gg02: set
up “Speed Fan” in manual MAN and “Power required” at 5%.
After checking the value of the B1 probe, reset the values as
they were previously.
•
Screen D02 and D04: control the sensor temperature B7
(water flow) and compare it with the sensor temperature B4
to see se if the circulator works with a correct deltaT (less than
8).
•
Screen D06 and D04: control the B11 (condensation) with B7
(water flow): the difference between them has to be included
between 1 and 2 grades for a proper operation. If the deltaT is
more verify the presence of possible narrowing in the circuit.
•
Screen D08: verify that the value SH (overheating) is included
between 4 and 5
•
Screen D15: verify, once set these conditions (B7 at 35°C and
compressor at 60 rps and deltaT water <8 and SH between 4
and 5 and sub-cooling between 3 and 4) the drain overheating
has to be about 20. During the normal operation, with free
compressor, this value can reach 45K.
•
Screen D16 (just available in the versions Kita-L, L42 and L66):
control the proper operation of the injection valve, considering
that over 12°C external the valve is off.
•
Menu G. Assistance --˃ g. Manual management --˃ SERVICE
PASSWORD --˃ Screen Gg06: activate a defrosting forced
cycle, setting up “Start the defrost cycle” in YES (once ended
the cycle the function automatically come back to AUT).
•
Menu G. Assistance --˃ g. Manual management --˃ SERVICE
PASSWORD --˃ Screen Gg01: “N09 Valv.3V ACS”, set up in
manual MAN, if the 3-way valve for domestic hot water
management is installed, to test the proper operation.
•
Restore all settings from manual MAN to automatic AUT.
•
Verify during the domestic production, that the HP performs
with priority respect to heating/cooling, that the difference
of temperature between the sensors B7(water flow) and
B3(domestic sensor that has to be placed in the upper part of
the tank) mustsn’t exceed 3 degrees.
•
Verify that the working tensions and network frequencies are
in the following ranges:
230/1/50 -> valori ± 6%
400/3/50 -> valori ± 6%
NOTE!
Some possible malfunctions can be intercepted at the start.
To extend the life of the heating pump it is a good habit to check
the value of the sensor B11 (condensation) and subtract this
value from B7 (water output). The delta T resulting, in case of
proper operation, has to be between 1,5 e 2, depending on the
thermal load of the heating pump and the water flow system
side.
If the delta T is more than 5 then it is really probable that there is
one of the following problems:
•
air in the cooling circuit;
•
air in the hydraulic circuit;
•
low flow water side;
•
faulty electronic valve (it works to close wrongly increasing
the condensation value).
A high delta T could be the responsible of possible high pressure
alarms; in particular during the production of high temperature
water.
NOTE!
Other problem easily detectable is the steady opening of the
electronic valve at 100%
possible reasons and solutions:
•
lack of refrigerant gas in the cooling system; for this reason
the electronic valve, to compensate the lack of gas, is open
over the normal values.
•
heat pump used in incorrect way. Example: installation
of a heat pump undersized respect to the building that
requires more power at rating levels. In this case for
example the compressor works at 100% even with positive
air temperatures; this fact requires an higher quantity of
refrigerant than the project data. The heat pump Kita has
to be sized to work at full speed just at minimum external
temperatures. The electronic valves are optimized to work
in the medium range of operation and for this reason
oversized valves aren’t installed, they would work too close
causing instability in the system. Possible solutions:
-
control the proper operation of the valve
-
control that in the HP Kita there is the right quantity of gas
-
replace the heat pump if wrongly undersized resoect
to the heating requirements of the building.
