I 8. VACUUMING AND CHARGING
Vacuuming is necessary to eliminate all moisture and air from the system. The outdoor unit is provided with
valve fittings.
Vacuuming
Before vacuuming, perform leak check for refrigeration
circuit. After the system piping are properly connected,
connect the flexible hoses to the correct charging nipples
as shown in the diagram. Ensure that flexible hose from
charging nipples are connected to the vacuum pump via
standard servicing valves and pressure gauges (gauge
manifold). Vacuum the air conditioner system to at least
500 microns Hg. Do not start the unit when the system
is engaged in vacuuming.
Charging
Before recharging, the vacuum must be held at 500
microns Hg for at least 15 minutes, then break vacuum
by charging R-41 0A refrigerant. Operate the unit for 15
minutes and ensure the refrigerant charge is of correct
amount as specified below.
After ensuring the system is correctly charged, remove
flexible hose from charging nipples and replace caps.
Precautions while charging
i. Refrigerant cannot be charged until field wiring has been completed.
ii. Refrigerant may only be charged after performing the leak test and vacuum drying.
I
LIQUOPIPE /
GAS PIPE
iii. When charging a system, care shall be taken that its maximum permissible charge is never exceeded, in view of danger
of liquid hammer.
iv. Charging with an unstable substance may cause explosions and accidents, so always ensure that the appropriate
refrigerant R41 0A is charged.
SYSTEM REFRIGERANT CHARGE LEVEL GUIDELINES
Cooling only
Refrigerant
Indoor
Outdoor
Liquid Pipe
Gas Pipe
Charge
(kg/7.5m pipe
length)
FDKR200AV16
RZR200AY16
1/2"
7/8"
4.0
FDKR300AV16
RZR300AY16
1/2"
1-1/8"
4.2
FDKR400AV16
RZR400AY16
5/8"
1-1/8"
7.6
* Keep minimum 7.5m pipe length during installation.
ADDITIONAL CHARGE
Based on liquid pipe size per meter length:
Liquid Pipe Size, inch
Additional Charge, kg/meter
1/2"
0.09
5/8"
0.114
Note:
The additional refrigerant charge amount recommended is a guideline for longer piping application. The actual charge
required may be different from the guideline due to different application and variation in site conditions.
14