Hi mike,
Yes, you may not install a water line if you do not plan to use the ice maker. We recommend that the ice maker remain turned off the entire time to avoid it from breaking.
Please turn to page 43 of this model's user manual link below to turn the ice maker function off.
https://downloadcenter.samsung.com/content/UM/202310/20231026145349567/FDR_RF6500C_3Door_MANUAL_WEB_DA68-04752Q-00_EN_MES_CFR.pdf
Should you have additional questions, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
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3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
When you message us, please provide us with this reference number 1146826303 to help our team pull up your information.
Leo