R22配管の問題
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R22のDN50配管は圧力配管の許可が必要ですか？ 必要であれば、付属の冷凍機ユニットの蒸発冷却には、容器証明書が必要なのか、それとも配管の方が必要なのか
機器が必要で、コンデンサーは別途必要
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