M7A HVAC Inspection process

MetroNorth demands a specific inspection process for HVAC in Car Inspection for 'Acceptance.' The two HVAC units, almost identical to the R142 Bombardier units, sit roof-top at each end of the car. WHAT MNCR is looking for is the seal lip in roof to specifications. Process is simple but time consuming.

First step is to disconnect all power/signal connections in ceiling. Second step is to release six ferrous steel bolts that secure unit to roof. Why ferrous steel bolts? Stainless steel alloy bolts often SIEZE (get stuck) in SS fittings. Third step is to secure a lift framework to HVAC unit and remove, setting it lightly on roof nearby (still on lift.) Fourth step is to very carefully place a straight edge (like a long aluminum level) along the lip and measure any gaps with a feeler gauge...IF the gap is excessive, there is a special tool which levers the lip up. Fifth step is to record results. Sixth step is to return unit into place and replace any aluminized tape damaged on insulation. Seventh step is to reconnect all power/signal connections and test for proper operation. Eighth step is to normalise ceiling panels. Married pair has four units to do. Easy work....we're not slacking time. MNCR wants Quality Assurance of no leaks....QA is in observance of procedure. Railroad doe NOT do this is HVAC inspections.....they only check for level of refrigerants and operation.