Installation introduction
Connecting the external unit
When making the connections, you should respect the standards and
local directives.
Remove the flare nuts
from
2 and 3 way valves, Insert the flare nuts on the pipes,
screw the flare nuts to connect the external unit with the same method described
for the tank unit.
Always protect hoses and cables to prevent their being damaged, as once
damaged can cause gas leaks(personal injury from frostbite).
16
Making the vacuum
Bleeding from the circuit should take place with a vacuum pump and pressure
gauge assembly suitable for R134a.
Make sure the vacuum pump is full of oil up to the level indicated by the oil gauge.
a) loose the caps of the taps of the 2 and 3 way valves, and of the service valve;
verify that the two valves on the outdoor unit are closed (D);
b) connect the vacuum pump (B) to the service valve (C) by the attack of low
pressure gauge (A);
c) After opened the valves of the vacuum pump (B), start it and let it run. Create a
vacuum for about 20 / 25 minutes;
d) verify that the low pressure gauge (A) indicates a pressure of 1 bar-(or -76 cm Hg);
e) close the valves of the pump and shut off (B). Verify that the gauge needle does
not move for about 5 minutes.
If the needle moves, there are air leaks in the system, then you must check all the
tightening and execution of flare at this point repeat the procedure from step c;
f)Disconnect the vacuum pump, (if you want to add refrigerant gas see the next
paragraph);
g) completely open the taps on 2 and 3 way valves (D);
h) Screw in the cap on the service outlet and valves (E);
i)after having tightened the plugs, make sure there are no gas leaks with the
appropriate detector.
C
D
D
E
E
A
B
C
English
