Ariston NIMBUS PLUS S NET Manual page 61

Refrigerant recover
If it becomes necessary to disconnect the refrigerant connections for unit repair, removal or disposal, in order to avoid refrigerant
loss to the atmosphere, the pump down operation must be carried out.
Pump-down is an operation intended to collect all the system refrigerant in the outdoor unit:
1. unscrew the caps of the 3-way valve outlets.
2. Set the unit in cooling mode through parameter 17.8.5 on the remote control (check compressor works) and leave on for a few
minutes.
3. connect the manometer.
4. close the smaller valve.
5. When the pressure gauge indicates «0» also close the other valve and switch off immediately.
6. close the valve caps.
After disconnection, protect valves and tubing ends from dust. After refrigerant recover operation, the outdoor unit is in Hard Fault
status (Recovery is done with the parameter 17.17 Service Reset).
MODEL
Nominal charge
Max length pipes
Min length pipes
Max length pipes without additional gas charge
Additional refrigerant charge (for pipe length above 20 m)
Max height difference between outdoor & indoor unit
(positive and negative)
ESTER OIL VG74 volume
Connections dimensions (inlet pipe)
Connections dimensions (outlet pipe)
HYDRAULIC CONNECTIONS ON INDOOR MODULE
Before carrying out the water circuit connections, check that:
• the system has been cleaned
• there are no impurities in the circuit water
• compatible components are used (do not connect copper and steel to each other)
• the system has been hooked up via the water circuit
• the water is never harder than 20°F (11,2 °dH) or softer than 12°F (6,7 °dH), and that its pH is 6.6 to 8.5. If this is not the case, install
water treatment to prevent incrustations and corrosion in system.
• the water circuit pressure never exceeds 5 bar, otherwise install a pressure reducer at the system's intake
• a disconnector with cock is installed between the system and the domestic water circuit (if present)
• the supplied expansion vessel is large enough to handle the water in the system
After the check:
• Connect the heating system to the internal unit where indicated from the points A and B in the next figure. Pay attention to the flow
directions.
• Connect the pipes to fill the installation.
• Connect the safety valve and the discharge valve of the internal unit with the provided silicone pipe.
A
Discharge
of safety valve
3 bar
INTERNAL UNIT
B C D E F
3/8"
5/8"
DHW Return
DHW Flow
Return Zone 1
Flow Zone 1
40 S EXT 50 S EXT
g
2300 2300
m
30 30
m
5 5
m
20 20
g/m
40 40
m
10 10
ml
500 500
inch
5/8 5/8
inch
3/8 3/8
EXTERNAL UNIT
70 S EXT 70 S-T EXT 90 S-T EXT
3080 3080 4300
30 30 30
5 5 5
20 20 20
40 40 40
10 10 10
670 670 1400
5/8 5/8 5/8
3/8 3/8 3/8
MODEL
40 S EXT
50 S EXT
70 S EXT
70 S-T EXT
90 S EXT
90 S-T EXT
110 S EXT
110S-T EXT
61 / GB
110 S-T EXT
4300
30
5
20
40
10
1400
5/8
3/8
LITERS
20
25
35
35
45
45
55
55