Epson WorkForce Pro WF-7820 All-in-One Inkjet Printer - Manual (Page 281)

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You see a screen like this:
6. Select On as the Permit temporary black printing setting.
7. Click OK .
8. Close the utility window.
9. Load plain paper or an envelope in your product.
10. Access the print settings in your print application.
11. Select Print Settings from the pop-up menu.
12. Select Plain Paper/Bright White Paper or Envelope as the paper type setting.
13. Select the Grayscale option.
14. Click Print to print your document.
Parent topic: Printing with Black Ink and Expended Color Cartridges