L__ng ___c l__ng gas n_p b_ sung cho m_y v_ __ bi_t n_p gas _i_u h_a bao nhi_u l_ __. Tuy nhi_n, b_n c_ th_ __c l__ng s_ gas c_n n_p theo ch_ __nh ___c in tr_n _i_u h_a. __c _i_m c_a gas R22: c_ kh_ n_ng dung n_p th_m t_p ch_t, n_n khi th_ n_p gas ch_ c_n _o ___c l__ng gas c_n n_p v_ c_ th_ ti_n h_nh n_p b_ sung m_ kh_ng c_n x_ b_ h_t ph_n gas c_n t_n __ng trong _i_u h_a th__ng. T_i ch_ __a ra v_i nguy_n nh_n sau __y ___ ba_n hi_u r_ng m_t __a ch_ uy t_n s_ kh_ng h_ gi_ nh_ nh_ng __a ch_ gi_ r_ __u nh_.