22
Installation Inspection and Testing
English
Installation
Step 4-1 Performing a drain leak test
1 Pour water into the drain pan.
CAUTION
࡛ Make sure that the water does not overflow onto the
electrical connection.
2 Check for leaks at the drain connection under the cover
panel.
<Front view>
3 Make sure that the hose is draining properly at the
outdoor unit.
Step 4-2 Performing pressure tests
using nitrogen
1 Install the red high-side hose of an R-410A-gauge
manifold set to the larger liquid/vapor line’s service port.
2 Attach a pressure regulator to a tank of dry nitrogen.
3 Connect the common hose of the gauge manifold set to
the pressure regulator’s hose connection.
4 Open the service port to connect the line set to the gauge
manifold set.
5 Pressurize the line set and indoor unit with dry nitrogen to
200 psig (adjust at the pressure regulator).
6 Using a soap-bubble solution suitable for refrigeration
systems, check the four flare connections for leaks.
Test parts for the
indoor unit
Test parts for the
indoor unit
7 Wait 10 minutes to make sure that the pressure does not
drop.
8 Increase the pressure to 400 psig and repeat steps 6
and 7.
9 Increase the pressure to 600 psig and repeat steps 6
and 7.
10 A drop in pressure during steps 7 through 9 indicates a
system leak in the refrigeration line set or indoor unit.
Perform a thorough leak check, repair the leak(s), and
then repeat this procedure.
11 Close the gauge manifold, shut off the nitrogen tank, and
remove the common hose to the pressure regulator.
12 Vent the nitrogen in lines to the atmosphere to prepare
for system evacuation.
Installation Inspection and Testing
To Next Page
Loading...
