A319
Flight Crew Air Transport Pilot (ATP); Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Total 1977; Flight Crew Type 1977
Confusion; Distraction; Human-Machine Interface; Time Pressure; Training / Qualification
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem
Human Factors; Company Policy; Chart Or Publication; Procedure
After starting engine number 2 on taxi; we ran the maintenance check procedure for MEL [for] OPS PLACARD. DEFECT: ENGINE HIGH PRESSURE VALVE INOPERATIVE AND SECURED CLOSED.The check was normal. However; we had just barely two minutes completed when we were cleared onto the runway for takeoff. So; while completing the check and returning the ENG bleed switch to on and the X Bleed switch back to AUTO; we got an ECAM for Pack 2. I quickly glanced at the procedure again and read that it said to turn Pack 2 off; so I turned off pack 2; and the ECAM went away. Quickly; we ran through ECAM completed and screens normal; completed the before takeoff checklist; and then completed a normal takeoff. However; after leveling off; we returned to the written procedure check and determined that pack switch should have only been turned off if the PRECOOLER OUTLET TEMPERATURE EXCEEDS 240 DEGREES CELSIUS WITHIN 2 MINUTES AFTER X-BLEED VALVE OPENING. We then returned the pack switch to on without any issues.  As we started our descent we ran the procedure again for low power settings by again turning the engine bleed switch off and X bleed switch to open. The descent and approach and landing were normal. Overall the procedure was confusing and should have been clarified beforehand.
A319 pilot reported making a mistake with the aircraft's packs because of an unclear checklist.