Specifications include, but are not limited to: Contract for Preventive Maintenance and Calibration for: a.Virtis GPFD 24x48 Vacuum Freeze-Dryer S/N 207287 b.Virtis GPFD 48x144 Vacuum Freeze-Dryer S/N 210283 Service to include: 1) Two (2) preventive maintenance visits and one (1) NIST calibration per contract year, to be scheduled with the MAC Lab Lead Conservator during normal Laboratory hours (M-F 9-5). Functions to be performed semi-annually or annually as appropriate to this equipment: a. Every Visit: Review with operator/owner on care and operation; Leak check complete refrigeration system; Check electrical system for proper operation; Check control system for proper operation; Provide complete report and review of actions with owner / operator. b. Semi-Annual: Check: refrigeration pressure gauges; compressor oil return sight glass for proper return; compressor for overheating on the low stage of two stage units; system for leaks of any fluids or gasses; condenser/receiver for non-condensable; compressed air line lubricators for proper oil level; empty separator if water is in the glass