tokens: For VCHP , the following tests shall be performed : 1 . The tests specified in clause 5.6.9.2.1 to 5.6.9.2.4 . 2 . Aging tests before charging the device with the control gas . 3 . Maximum heat transport capability with the gas front located between condenser and reservoir . 4 . Residual conductance with the gas front between condenser and evaporator .