14
15
6.3 Pipe length and elevation
The pipe length and the amount of refrigerant is determined by the table below:
Model
Pipe Size
Standard
Length (m)
Max. Elevation
B (m)
Max. Length
A (m)
Additional
refrigerant (g/m)
Gas
Liquid
LNIV2610
3/8"
(
∅
9.53)
1/4"
(
∅
6.35)
5
8
20
20
LNIV3510
1/2"
(
∅
12.7)
1/4"
(
∅
6.35)
5
8
20
20
LNIV5010
5
10
25
20
LNIV6510
5/8"
(
∅
16.0)
3/8"
(
∅
9.53)
5
10
25
40
CAUTION
The capacity test is based on the standard length and the maximum permissive length is based on system reliability.
The oil trap should be installed every 5-7 metres
6.4 Installation for the fi rst time
Air and moisture in the refrigerant system have undesirable effects as detailed below:
• Pressure in the system rises.
• Current required to operate the unit increases.
• Cooling or heating effi ciency drops.
• Moisture in the refrigerant circuit may freeze and block capillary tubing.
• Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak-tested and properly cleared
to remove gas and moisture from the system.
Gas leak check (Soap water method):
Apply soapy water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections with a soft
brush to check for leakage at the connecting points of the piping. If bubbles appear, the pipes are leaking.
(Indoor unit)
(Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
Lo
Hi
Handle Hi
Two-way valve
Close
Manifold valve
Compound meter
Pressure
gauge
20Pa
Handle Lo
Charge hose
Charge hose
(Outdoor unit)
Close
Three-way valve
1. Air purging with vacuum pump
1. Tighten the fl are nuts of the indoor and outdoor units, confi rming that both the 2-way and 3-way valves are set to the “closed” position.
2. Connect the charge hose with the push pin of handle to the 3-way valve’s gas service port.
3. Connect the charge hose of Handle Hi connection to the vacuum pump.
4. Fully open the Handle Lo of the manifold valve.
5. Turn on the vacuum pump to evacuate all gases.
6. Run the pump for 30 minutes and check whether the compound meter indicates -0.1Mpa. If this pressure level is not achieved after
pumping for 50 minutes, please check if there are any leakage points. Fully close the Handle Lo valve of the manifold valve and turn off
the vacuum pump. Confi rm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).
7. Turn the fl are nut of the 3-way valves about 45° counterclockwise for 6 or 7 seconds after the gas has come out, then tighten the fl are
nut again. Make sure the pressure display in the pressure indicator is a little higher than the atmospheric pressure. Then remove the
charge hose from the 3 way valve.
8. Fully open the 2-way and 3-way valves and securely tighten the cap of the 3-way valve.
E963_Lennox Luna Inverter Service Manual 2.indd 14-15
E963_Lennox Luna Inverter Service Manual 2.indd 14-15
21/12/11 10:28 AM
21/12/11 10:28 AM