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SINCLAIR
5.1.4 Vacuumization and Desiccation
5.1.4.1 Requirements on Vacuum Pump
The vacuum pump for different refrigerant systems cannot be the same.
The ultimate vacuum degree of the vacuum pump should reach -0.1 MPa.
The air discharge capacity of the vacuum pump must be greater than 4 L/S.
The precision of the vacuum pump must be greater than 0.02 mmHg.
The system vacuum pump must be equipped with a check valve.
5.1.4.2 Procedure and Precautions for Vacuumization and Desiccation
(1) Connect the perfusion hose with the nozzle for perfusing refrigerant. (The gas valve and liquid
valve must be turned off.)
(2) Connect the perfusion hose with the vacuum pump, as shown in Figure 5-1.
(3) Totally open the low-pressure valve on the pressure gauge.
(4) Start the vacuum pump. After vacuumizing for at least 20 minutes, turn off the low-pressure valve
and stop the vacuum pump when the pressure gauge indicates -1.0bar. Keep it for 2 minutes. If the
pressure value does not increase, it means that vacuumization and pressure maintaining succeeds. If
the value increases, it means that air gets into the system. Check whether leakage exists and
vacuumize again.
(5) Remove the perfusion hose from the gas valve.
(6) Totally open the valve pin from the gas valve and liquid valve.
(7) Screw the fluoride injection mouth nut and tighten the valve caps for the liquid valve and gas
valve.
(8) Tighten the valve cap and use suds or leakage detector to check whether there is gas leakage at
the connection point of the outdoor unit and water tank.
5.2 Installation of Water Pipes
(1) Preparing of water pipes
Hot water tank hot water pipes must be selected out of the tube, it is recommended to use a nominal
outside diameter of dn20, S2.5 series PPR pipe. Such as the use of other similar insulated pipe, can
refer to more than the outside diameter and wall thickness to choose, do not recommend the use of
plastic pipe and other fast heat pipe.
(2) Installing water outlet and inlet pipes for the water tank
The safety valve, filter, and cut-off valve must be installed for the water inlet pipe, and the installation
order must be consistent with that shown in the unit installation diagram. At least a cut-off valve must be
installed for the water outlet pipe.
In order to facilitate water tank emptying or cleaning, you are advised to add a tee joint and a cut-off
AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
Figure 5-1 Vacuum pump connection
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