Bard MEGA-TEC W090A, Service Instructions Manual

Page: 107 / 159

Manual 2100-479
Page
2 of 11
Recovery Equipment Rated for R-410A ...................3
Leak Detectors .........................................................3
Gauge Manifold ........................................................3
Attaching Gauge Manifold ........................................3
Attaching Manifold Hose to Schrader Valve .............4
Leak Test ..................................................................4
Evacuation ........................................................ 4 & 5
Charging ..................................................................5
Preliminary Charging Steps .....................................5
Charging the System by Weight ..............................5
CONTENTS
General
Troubleshooting the Mechanical System
Air Conditioning & Heat Pump - Cooling .............9
Low Suction — Low Head Pressure .........................9
High Suction — Low Head Pressure ........................9
Low Suction — High Head Pressure ........................9
High Suction — High Head Pressure ........................9
Heat Pump - Heating ..............................................9
Low Suction — Low Head Pressure .........................9
High Suction — Low Head Pressure ........................9
Low Suction — High Head Pressure ........................9
High Suction — High Head Pressure ........................9
Figures
Figure 1: Typical AC System Cooling Cycle .............6
Figure 2: Typical HP System Cooling Cycle ............7
Figure 3: Heating Cycle ...........................................8
Charts
Troubleshooting Chart for Air Conditioners ............10
Troubleshooting Chart for Air-to-Air Heat Pumps ....11