MAXA 5300 W Bedienungs- Und Installationsanleitung Seite 45

!
● 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 -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.
5.9. 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.
Note: Assume equivalent pipe length of the branching pipe header to be 0.5m, of the D3T-RC1 and D3T-RC2 to be 1m
(for calculation purposes).
IV. 5.10. How to expel the air with a vacuum pump
Stop valve operation introduction
a) Opening stop valve
1. Remove the cap and turn the valve counter clock-wise with the hexagon wrench.
2. Turn it until the shaft stops. Do not apply excessive force to the stop valve. Doing so may break the valve body, as the
valve is not a backseat type. Always use the special tool.
3. Make sure to tighten the cap securely.
b) Closing stop valve
1. Remove the cap and turn the valve clockwise with the hexagon wrench.
2. Securely tighten the valve until the shaft contacts the main body seal.
Make sure to tighten the cap securely. For the tightening torque, refer to the table above.
Always use a charge hose for service port connection.
!
CAUTION
After tightening the cap, check that no refrigerant leaks are present.
• Using the vacuum pump
1. Loosen and remove the maintenance nuts of stop valves A and B, and connect the charge hose of the manifold valve
to the service port of stop valve A. (Be sure that stop valves A and B are both closed)
2. Connect the joint of the charge hose with the vacuum pump.
3. Open the Lo-lever of the manifold value completely.
4. Turn on the vacuum pump. At the beginning of pumping, loosen the maintenance nut of stop valve B a little to check
whether the air comes in (the sound of the pump changes, and the indicator of compound meter turns below zero). Then
fasten the maintenance nut.
5. When the pumping has finished, close the Lo-lever of the manifold valve completely and turn off the vacuum pump.
Make pumping for 15 minutes or more and check that the compound meter indicates -76cmHg (-1X10 Pa)
6. Loosen and remove the cap of stop valves A and B to open stop valve A and B completely, then fasten the cap.
7. Disassemble the charge hose from the service port of stop valve A, and fasten the nut.
Pipe size on liquid side
Φ6.4
Φ9.5
service por t
sea l shaft
CAUTION
Refrigerant to be added per meter
0.024kg
0.063kg
mainten ance nu t
cap
h exago n hole
Fig. 5-11
45