Air Conditioning and Heating R134a for All Caterpillar Machines Caterpillar


Refrigerant Receiver-Dryer

Usage:

TK711 101


Ilustrasi 1g01508209
(1) Sakelar pemutus tekanan rendah
(2) Unit penerima-pengering
(3) Relief valve tekanan tinggi
(4) Desikan


Ilustrasi 2g01508210
(1) Sakelar pemutus tekanan rendah
(2) Unit penerima-pengering
(3) Relief valve tekanan tinggi
(5) Indikator kelembapan

Refrigerant tekanan tinggi dan temperatur tinggi meninggalkan koil kondensor dan melewati unit penerima-pengering (2). Refrigerant cair di bagian dalam unit penerima-pengering melewati desikan (4). Desikan menyerap kelembapan dalam jumlah kecil.

Unit penerima-pengering menampung refrigerant dalam jumlah yang sedikit. Refrigerant yang ditampung ini digunakan untuk mengimbangi penggantian permintaan sistem. Permintaan sistem ini dapat dihasilkan dari perubahan kecepatan pada kompresor, perbedaan beban panas, atau hilangnya refrigerant dalam jumlah kecil.

Relief valve tekanan tinggi (3) terletak di sebagian besar unit penerima-pengering. Katup memungkinkan refrigerant dilepas ke atmosfer jika tekanan meningkat hingga sekitar 3450 kPa (500 psi). Sebagian besar unit penerima-pengering juga dilengkapi dengan sakelar pemutus tekanan rendah (1). Jika tekanan sistem turun hingga sekitar 175 kPa (25 psi), sakelar akan terbuka. Kondisi ini akan membuka sirkuit listrik ke kopling magnetik dan kompresor tidak akan beroperasi.

Beberapa unit penerima-pengering dilengkapi dengan indikator kelembapan (5). Indikator kelembapan ini digunakan untuk menentukan kelembapan relatif dalam sistem. Jika indikator kelembapan berwarna biru, sistem dalam keadaan kering. Jika indikator kelembapan berwarna pink atau putih, maka unit penerima-pengering harus diganti. Rujuk ke Pembongkaran dan Perakitan, "Pelepasan dan Pemasangan Penerima-Pengering" dalam buku petunjuk ini.

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