Pioneer YN020GMFI22M2D Service Manual page 13

b. If servicing a 3, 4 or 5 zone system, connect
only the low pressure hose on your gauge
manifold (usually blue) to the 3 way (Gas)
valve's service
COMMON or the MASTER Circuit. Fully open
the Low side valve on the low pressure side of
your gauge manifold only. See below drawing.
6. Connect the center hose of the gauge manifold
(usually yellow) to the vacuum pump.
7. Start the vacuum pump and operate according to
pump manufacturer's specifications.
8. Perform vacuuming/evacuation for a minimum total
period of 30 minutes for each attached circuit
added together (example 90 minutes for a system
with 3 indoor units) and check that the low pressure
gauge indicates a vacuum of 30 in/hg (500
microns). (A more sensitive vacuum gauge should
be used if available).
port, belonging to
9. If the proper vacuum cannot be achieved within this
time frame, the vacuum pump should be kept
running for an additional 1 hour. If after the
additional 1 hour of operation the vacuum still
cannot be achieved, there could be a leak at one
or more of the flare pipe connections at either end
of a refrigerant pipe. Leak must be located and the
nut must be tightened properly.
10. If the vacuum is achieved, close the valve(s) on
your gauge manifold set first and shut the vacuum
pump off. Leave the gauge manifold and the hose
connected and recheck the vacuum reading 30
minutes later to assure there is no vacuum loss.
(Small insignificant increase in the vacuum level is
normal).
11. ALL occupied circuits as well as the outdoor unit
are now dry and free of contaminants. Do not
remove the hose of your gauge manifold set from
the service port(s).
12. Connect the middle hose from the manifold set to
the refrigerant container (this is the yellow line on
most sets). With refrigerant 410A the container
must be inverted (upside down) when adding the
refrigerant.
13. The air in the gauge hoses needs to be purged out.
Use the pressure from the system to purge the low
side line, loosen the connection on the manifold for
a second. Next open the valve on the refrigerant
the
container to pressurize the line, now loosen that
hose at the manifold for a second and purge that
line.
14. Set the refrigerant container on an electronic
charging scale and record the weight or zero the
scale depending on the scale used.
15. Next determine the refrigerant charge to be added.
The total standard factory charge volume is written
on the side specification label of your outdoor unit.
Consider additional volume for extended line sets.
16. Refrigerant can now be added to the system. The
first step will be performed when the system is
powered off entirely. Open the low pressure valve
on the gauge manifold set to start charging the unit
with liquid refrigerant, Please remember to nurse
the refrigerant in slowly by controlling the low
pressure valve at the Low side of your gauge
manifold (open for 3 seconds and close for 10
seconds). Keep track of the refrigerant being
added to the system (do not overcharge the
system).
17. If the system stops accepting refrigerant before the
entire intended volume is charged, close the low
pressure valve on the Low pressure side of your
manifold. Wait for 15 minutes and open Low
pressure side of your manifold and try again,
repeat this several times until no more or only very
little refrigerant can be charged this way.
18. Close the Low pressure side of your manifold .Start
the system with all indoor units attached running in
cooling mode and lower the set points on each of
their controllers to the minimum setting so the
system will not shut off during the procedure.