That is good news. I suspect that the reason they told you to remove the plug is that they didn't know you have a VRV installed. With that and assuming there is no trapped water, you should not need to manually drain the panels. But you should check at least once before the winter sets in to make sure the panels are draining properly and completely.
Mark
Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater
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