Bulletin 30-121.019
17
Copyright © 2015 Unico, Inc.
(SAC 37.4255.109.02)
Connect the indoor units using, if required, the adapter on the low
pressure valves. Remove caps from service valves of both tubes.
Then start vacuum pump and let it run for the time indicated in the table
in step K (vacuum 500 microns Hg abs.).
With vacuum pump still running close the low pressure knob on valve
manifold. Then stop vacuum pump. Using a hex wrench, open the
service valve on small tube, then close it after 10 seconds. Check tightness
of all joints using liquid soap.
Turn the service valves stem in counterclockwise to fully open the valves. At
this point vacuum pump flexible hose can be disconnected. Replace bonnet
and flare nut, tighten them to 15 lb-ft (200 kg-cm) with a torque wrench.
Repeat what described from L to M for the second, third and fourth circuit.
The indoor units have to be marked as “indoor unit circuit
1
,
2
,
3
and
4
”. Be
sure that the refrigerant connection to indoor unit circuit
1
,
2
,
3
or
4
corresponds to its own electrical connection.
L
M
Low pressure
High pressure
EMIX
UNIT
TO
EMIX
FROM
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UNIT
UNIT
UNIT
UNIT
EMIX
UNIT
TO
EMIX
FROM
EMIX
UNIT
UNIT
UNIT
UNIT