can the 7/8 inch line be used on this

Yes. A 7/8-inch suction line can be used with the AQ-GLXS3BN4810 / AQ-CHPTA4830C3 / AQ-GR9S800804CN system because both the outdoor condenser and the indoor evaporator coil are equipped with 7/8-inch suction line connections and 3/8-inch liquid line connections. The outdoor unit has a 1-1/8-inch suction service valve designed to accept a 7/8-inch line set, making a 3/8-inch liquid × 7/8-inch suction line set the standard connection for this system.

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