SRUB-IOM001-EN 13
Refrigerant Charging
The initial volume of refrigerant should be charged into the
high side of the system, in liquid form, through the liquid line
charging valve. The following procedure is suitable for most
systems.
1. Connect a cylinder of refrigerant and connect manifold
gauge as the figure 3. Before tightening the connection at
the charging valve, crack the valve on the refrigerant
cylinder and allow enough refrigerant gas to escape through
the loose connection to purge air from the connection to
purge air from the connecting line. Tighten the connection.
2. Close the system electrical disconnect switches and the
unit on-off switch. Start the system fan.
3. Open the valve on the cylinder and then the liquid line
charging valve, allowing liquid refrigerant to enter the
system.
4. Continue charging until the estimated refrigerant charge has
entered the system. At this point, close the liquid line
charging valve and the refrigerant cylinder.
5. Allow the system to continue to operate, frequently
checking the liquid line sight glass and the compressor
suction and discharge pressure gauge readings.
6. Check superheat, supply air temperature and return air
temperature. If the system need more refrigerant, charging
it to suction line charging valve.
7. It is good practice to leave the refrigerant drum connected
to the charging valve until the system has completed its 24
hour test run. This permits the addition or removal of
refrigerant, as necessary to establish proper system charge.
Model
Total Refrigerant Charge
kg lb
SRUB080 8.70 19.17
SRUB110 11.45 25.25
SRUB130 12.81 28.25
SRUB160 14.70 32.41
SRUB190 15.61 34.41
SRUB220 19.76 43.56
SRUB250 22.48 49.56
Figure 3
Manifold
Gauges
Liquid Line
Gauge Port
Liquid Line
Service Valve
Suction Line Gauge Port
Suction Line Service Valve
Table 3: Refrigerant Charging for 50 Hz
Domestic SRUB Model
Refrigerant Charging
and Evacuation
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