Airwell 7SP091170, Service Manual

Page: 104 / 151

Installation details
102
Installation
4.1.2
For outdoor unit YCZ327/YCZ430/YCZ542
1) Completely tighten the flare nuts of the indoor and each braches of outdoor unit, confirm that both the
main valves(Gas and liquid) are set to the closed position.
2) Connect the charge hose with the push pin of handle lo to the Main valve(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) Fully open the branch valves (A/B/C/D/E)
6) Operate the vacuum pump to evacuate.
7) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If
the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the
pressure
can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points.
Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm
that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).
8) Open the Main valve(Gas) about 45° counterclockwise for 6 or 7seconds after the gas
coming out, then close the valve again. Make sure the pressure display in the pressure indicator is a little
higher than the atmosphere pressure. Then remove the charge hose from the Main valve(Gas).
9) Fully open the main valve(Gas) and main valve (Liquid) and securely tighten the cap of the valves.
Lo Hi
Manifold Valve
Vacuum pump
Handle Lo
Handle Hi
Charge Hose
Main Valve
(Gas)
Branch valve
(Gas)
Main Valve
(Liquid)
Outdoor Unit
To
indoor unit
Pressure gauge
Open
Close
Vacuum outdoor unit YCZ327/YCZ430/YCZ542
4.3. Adding the refrigerant if the pipe length exceeding the pre-charged length
Procedure:
1) Connect the charge hose to the charging cylinder R410a, make the cylinder bottom up to ensure the
liquid charge.
2) Purge the air from the charge hose and connect the hose to the service port on gas valve (Main or any
branch)
3) Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air
(be careful of the liquid refrigerant).
4) Put the charging cylinder onto the electronic scale and record the weight.
5) Operate the air conditioner at the cooling mode.
6) Open the valve (Lo) on the charge set and charge the system with liquid refrigerant.
7) When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose
from the gas valve service port immediately and turn off the air conditioner before disconnecting the
hose.
8) Mount the valve stem caps onto the service port