1.Outdoor is lower
liquid nonreturn loop
Indoor
Outdoor
2.Outdoor is higher
Outdoor
Oil trap (one per
6m)
Indoor
Crucial points:
When testing, never use oxygen,flamable and poisonous gases.
Step 1:Charge for more than 3 minutes under 0.3MPa(3.0kg/cm
2
g)
Step 2:Charge for more than 3 minutes under 1.5MPa(15kg/cm
2
g)
--Serious leakage may be found.
Step 3:Charge for more than 24 hours under 3.0MPa(3.0kg/cm
2
g)
--Small leakage may be found.
Check for pressure decrease
Without pressure decrease-Pass
With pressure decrease-Check for leaage.There will be a 0.01MPa(0.1kg/cm
2
g) pressure change
ambient temperature change during the 24-hour pressure charge.It should be
corrected during the test.
for every 1 C
O
Field tube
installation
Field tube
installation
To the unit
To the unit
(Gas side)three-way valve
(Gas side )access hole
Detailed diagram of the
three-way valve
To the gauge
distributor
(Liquid side)access hole
Three-way valve fully closed liquid side
6.4
6.4
Copper pipe
Relief valve
Nitrogen bottle
VL VH
Gauge distributor
High-pressure
gauge
Low-pressure
gauge
Three-way valve fully
closed(gas side)
Solder joint
Solder joint
Tightly
closed
Indoor unit
Indoor
Outdoor
Access hole
Copper
pipe
Solder joint
Tightly
closed
Tightly
closed
Access hole
Outdoor unit
(Liquid side)three-way valve
Installation
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