Refrigerant Pipe Connection - Carrier 40MB*D Installation Instructions Manual

Note: All used branch pipe must be produced by Midea,
otherwise the unit will malfunction. The indoor units should
be installed equivalently at both sides of the U type branch
pipe.
8.2 Size of joint pipes
Table.8-2 Size of joint pipes for 410A
¢0.375in/9.5 ¢0.25in/6.35 CE-FQZHN-01C
¢0.5in/12.7 ¢0.25in/6.35 CE-FQZHN-01C
¢0.626in!15.9 ¢0.375in!9.5 CE-FQZHN-01C
8.3
1
2)
Vacuum with vacuum pump
3)
Use the vacuum pump with the vacuum level lower than
-14.5PSi!-0.1MPa and the air discharge capacity above
1.4CFM!40L/min.
It is not necessary to vacuum the outdoor unit. Don't open the
outdoor unit gas and liquid pipe shut-off valves.
Make sure the vacuum pump registers as -14.5PSi/-0.1MPa or
below after 2 hours or longer operation. If the pump operated 3
hours or above can not achieve -14.5PSi!-0.1MPa or below,
please check whether there is a water mix or gas leak inside of
the pipe.
Connect with vacuum pump
.0.
I Perform the pump (last for 2 hrs or above)
,,_ I1. Close-off the valve of I
vacuum meter
When get the vacuum level • I
-0.1MPa the pump should 2. Cut off the connection I
run for 2()-60 mins J between pressure meter
I / and vacuum pump.
,_ / 3. Close the vacuum I
[ vacuum pump
.G
Place the vacuum state unused (1 hrs or above)l
I
I
,_ CAUTION
Fig.8-2
Don't mix up the different refrigerants or abuse the tools and
measurements which directly contact with refrigerants.
Don't adopt refrigerant gas for air vacuuming.
If vacuum level could not get to -14.5PSi/-0.1MPa, please check
whether resulted by leakage and confirm the leakage site.If no
leakage, please operate the vacuum pump again 1 or 2 hrs.
8.4
Refrigerant amount to be added
Calculate the added refrigerant according to the diameter and
the length of the liquid side pipe of the outdoor/indoor unit
connection. The refrigerant is R410A.
Table.8-3
¢0.25in/6.35 0.0331b/0.015kg
¢0.375in/9.52 0.0661b/0.030kg
1) The branching pipe must be installed horizontally, error angle
of it should not large than 10 °. Otherwise, a malfunction will
occur.
U-shaped branching pipe
I A
!
A direction view
Wrong Correct
Horizontal surface
Fig.8-3
9. REFRIGERANT PIPE CONNECTION
9.1 Expel The Air
1 Flaring
• Cut a pipe with a pipe cutter. (Refer to Fig.9-1)
2
O× X X
/__ 9_ _Lean eludj_
bull_
I I I
Fig.9-1
• Insert a flare nut into a pipe and flare the pipe.
Fasten the nut
• Put the connecting pipes at the proper position,
wrench the nuts with hands then fasten it with
two wrenches simultaneously. (Refer to Fig.9-2)
__ Fig.9-2
CAUTION
Too much torque will harm the bellmouthing and too little will
cause leakage. Please determine the torque according to
Table 9-1.
17