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2.4 Instrumentos
INSTRUMENTOS
A grupo de manómetros
B cortador de tubos
C tubo de carga
D balança electrónica para carga de fl uido refrigerante
E chave dinamométrica (ø nominal 1/2, 5/8)
F curvadora de tubos com pinça
G botija de refrigerante
H bomba para o vácuo
I dispositivo de procura de perdas
A) Grupo de manómetros
B) Cortador de tubos
C) Tubo de carga
O tubo de carga para refrigerante R410A.
D) Balança electrónica para carga de fl uido refrigerante
O refrigerante R410A, por causa da sua pressão alta e da velocidade de evaporação, não po-
derá ser mantido no estado líquido; desta forma, no interior do cilindro, formam-se bolhas de
refrigerante gasoso, o que torna difícil a leitura dos valores de carga. É aconselhável utilizar
uma balança electrónica para ter a certeza dos valores. A balança electrónica para carga de
refrigerante tem uma estrutura com quatro pontos de suporte para medir o peso do cilindro
de refrigerante. Para carregar o fl uido refrigerante abra/feche a válvula.
E) Chave dinamométrica
A chave dinamométrica para os diâmetros nominais de 1/2” e 5/8” é de tamanho diferente dos
lados para atender às medidas mudadas dos bocais de curva.
F) Curvadora de tubos com pinça
A curvadora de tubos com pinça para R410A é equipada com um grampo com furo receptor de
maneira que a projecção do tubo de cobre possa ser regulada a 0 ~ 0,5 mm, na realização da
curva.
G) Botija de refrigerante
H) Bomba para o vácuo
É necessário um engate de carga de 1/2 UNF 20 roscas/polegadas e o respectivo vedante.
I) Dispositivo de procura de perdas
Para o fl uido R410A utiliza-se um dispositivo de procura de perdas exclusivo para os refrige-
rantes HFC. Deve ter grande sensibilidade de medição.
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