York YVAA - Page 8

JOHNSON CONTROLS
8
Form 201.47-ICOM1
Issue date: 17/11/2022
Table of Contents (cont'd)
Print key .......................................................................................................................................................156
System switches key ....................................................................................................................................159
Section 9 - Maintenance......................................................................................................................................161
General requirements ...................................................................................................................................161
Leak testing during operation .......................................................................................................................162
Vapor connection locations...........................................................................................................................162
Checking the system for leaks .....................................................................................................................162
Leak testing ..................................................................................................................................................162
System pressure test ....................................................................................................................................163
Conducting the gas pressure hold test ......................................................................................................... 163
What to do next ............................................................................................................................................163
Conducting the soap visual gas leak test .....................................................................................................163
Conducting the optional trace gas leak test .................................................................................................164
System evacuation .......................................................................................................................................165
Vacuum dehydration .....................................................................................................................................165
Dehydration ..................................................................................................................................................166
Conducting the dehydration process ............................................................................................................ 167
Result ...........................................................................................................................................................168
Conducting the final evacuation ...................................................................................................................168
Result ...........................................................................................................................................................168
Refrigerant charging ..................................................................................................................................... 168
Removing the refrigerant charge for service ................................................................................................171
Checking and trimming the refrigerant charge .............................................................................................172
Definitions .....................................................................................................................................................172
Checking the refrigerant charge during unit shutdown ................................................................................. 172
Microchannel coil cleaning ...........................................................................................................................173
Cleaning procedure required for standard and environment guard microchannel coils ............................... 173
Cleaning procedure for environment guard premium microchannel coils ....................................................173
Steps to touch-up small sections of the finned coil surface: .........................................................................174
Steps to touch-up end (dead) tubes and/or condenser coil headers: ...........................................................174
Materials required: ........................................................................................................................................174
Chilled liquid system maintenance ...............................................................................................................175
Maintenance requirements for YVAA chillers ...............................................................................................177
R-134a conversion table ..............................................................................................................................181
R-513A conversion table .............................................................................................................................182
R-513A conversion table .............................................................................................................................183
Section 10 - Decommissioning, dismantling, and disposal ............................................................................189