76
COSMOGAS
Ecotower
10 - MAINTENANCE
10.17 - Check the operating pressures of
the refrigerant circuit
To check the refrigerant circuit pressures, proceed as follows:
1.- Make sure that the heat pump is on;
2.- Access the control panel and check the following
parameters in the “Info” menu (section 8.2.15):
a.- compressor suction and discharge pressures and
temperatures;
b.- check the outdoor temperature;
3.- Check the supply and return temperature of the heat pump
sensors the menu on the synoptic;
4.- Check that the overheating (in evaporation) is contained
within 7K and check that the subcooling (in condensation)
is greater than or equal to 2K.
WARNING!!! Never touch the compressor
discharge pipe: it can reach temperatures above 100 ° C
and cause burns in case of contact.
10.18 - Refrigerant circuit repairs
Always drain the system before carrying out repairs on the
refrigeration circuit. The refrigerant gas must not be dispersed
in the environment for any reason. Use the appropriate
portable stations for gas recovery and recycling.
To identify any leaks, proceed as follows:
1.- Fill the circuit with nitrogen at a pressure of
40 bar
;
WARNING!!! Do not use air or oxygen, they can
cause explosions.
2.- Check the leak with the proper equipment;
3.- Once you have identified the leak, completely discharge
the nitrogen circuit;
4.- Eliminate the loss by brazing with a high silver content
alloy (Ag 34%, Cu 25%, Zn 22%, Cd 19%), and deoxidizing
paste;
5.- Recharge the refrigeration circuit.
If, at the time of the check, the circuit is completely empty,
also replace the filter drier before refilling.
10.19 - Filling the refrigerant circuit
Act as follows:
1.- Connect the special vacuum pump inside the refrigeration
circuit to the suction pressure socket of the outdoor unit
(section 6.16.4);
2.- Start the pump to remove all the air present and obtain
a vacuum of at least
0.5 mbar absolute, keeping the
vacuum pump on for at least 30 min
;
3.- Now add the refrigerant gas,
in liquid form
, in the quantities
indicated in section 11 under the heading “Refrigerant”;
4.- Add any additional refrigerant gas supply to the nominal
charge in relation to the length of the pipes, as indicated
in section 6.16.4;
5.- Check the charge of the refrigerant circuit.
10.20 - Replace the pump
If it is necessary to replace the circulation pump, proceed as
follows (refer to Figure 3-1):
1.- Drain the water from the heating circuit;
2.- Access the internal components of the device, following
section 10.24;
3.- Extract the pump towards the outside;
4.- Disconnect the electrical wires from the pump body.
10.21 - Cleaning the filter
To clean the filter in the heat pump circuit, proceed as follows:
1.- Disconnect the electrical supply to the system;
2.- Close the filter interception valves;
3.- Empty the water contained in the circuit;
4.- Remove the filter cap while keeping the body locked;
5.- Eliminate any impurities and deposits from the filter;
6.- Close the filter with the special cap previously removed;
7.- Reopen the shut-off valve and fill the system, paying
attention to the deaeration of the same.
10.22 - Refrigerant accumulation in
outdoor unit
In the event that it is necessary to disconnect the indoor
unit from the outdoor unit, it is necessary to accumulate the
refrigerant gas in the outdoor unit.
To do this, act as follows:
1.- Access the refrigerant connections of the outdoor unit by
removing the valve cover (Figures 3-2 and 3-3);
2.- Remove the caps (“A” in Figure 6-20) of the refrigerant
fittings of the outdoor unit;
3.- Using the control panel, access the “OTHER OPTIONS”
menu (section 8.2.13) and start the “Refrigerant recycle
function” ;
4.- The unit starts cooling automatically;
5.- Go to the “Info” menu (8.2.15) and check the working
pressures (Figure 8-25);
6.- With an Allen key, close the liquid line valve on the outdoor
unit side (1/4 ”or 3/8” refrigerant line valve) (Figure 3-2
and 3-3);
7.- Check in the “Info” menu (section 8.2.15) that the suction
pressure (Ps) reaches the
value 0.0 bar and immediately
close the gas line tap
on the outdoor condensing unit side
(tap on the 1/2 “or 5” refrigeration line / 8 “depending on
the power) (Figures 3-2 and 3-3);
8.- Go back to the “OTHER OPTIONS” menu (section 8.2.13)
and stop the “Refrigerant recycle function”;
9.- The function will be turned off in 60 seconds. Now the
refrigerant gas is all inside the outdoor unit.
10.23 - Draining the heating circuit
The appliance is not equipped with a drain valve. The installer
must provide the system drain valves as shown in Figures 5-4,
5-6, 5-8 and 5-10 item “43”. To empty the circuit, proceed as
follows:
1. - Open the drain valves and the vent valves of the heating
elements, starting from those installed higher up;
2. - Once all the water has been evacuated, close all the vents
of the heating elements and the drain valves;
WARNING!!!
It is absolutely forbidden to recover
and / or reuse the water evacuated from the heating circuit
for any purpose, as this could be polluted.
