7
johNSoN coNtroLS
ForM 102.20-N1 (1109)
POWER COnnECtiOnS .........................................................................................................................2-37
Single Point Power ..............................................................................................................................2-37
Motors for Supply Fan, Return Fan, Exhaust Fan
............................................................................2-37
Energy Recovery Wheel Option .........................................................................................................2-37
gas heat Option ..................................................................................................................................2-38
Electric heat Option ............................................................................................................................2-39
Available Power Options ...............................................................................................................2-39
Electric heat disconnect Switch Options ....................................................................................2-39
Available Control Options .............................................................................................................2-40
installation ......................................................................................................................................2-40
APPliCAtiOn inFORMAtiOn ................................................................................................................2-40
MEChAniCAl inStAllAtiOn ...............................................................................................................2-40
ElECtRiCAl inStAllAtiOn ................................................................................................................2-42
Humidifier Option (Electric)
...............................................................................................................2-43
Humidifier Option
................................................................................................................................2-43
PiPing COnnECtiOnS ..........................................................................................................................2-44
Coil Piping ...........................................................................................................................................2-45
Staggered Coils ...................................................................................................................................2-45
Water ...............................................................................................................................................2-46
Water Coils - hot Water and Chilled Water .............................................................................2-46
hot and Chilled Water Coil Performance ................................................................................2-46
Water treatment ........................................................................................................................2-48
Steam ..............................................................................................................................................2-48
Steam Coils ...............................................................................................................................2-48
Steam distributing Coils ..........................................................................................................2-48
Steam Control ...........................................................................................................................2-48
Steam traps ..............................................................................................................................2-49
ViFB and iFB .............................................................................................................................2-50
Refrigeration ...................................................................................................................................2-54
Direct Expansion Coils (DX)
....................................................................................................2-54
DX Coil Types
............................................................................................................................2-55
Combined Coil types ...............................................................................................................2-55
DX Coil Circuiting
.....................................................................................................................2-55
DX Coil Circuiting And Staging
...............................................................................................2-57
Thermostatic Expansion Valves (TXV)
...................................................................................2-59
hot gas Bypass .............................................................................................................................2-59
Maintaining Adequate Airflow
...............................................................................................2-59
VAV Systems .............................................................................................................................2-59
tABlE OF COntEntS (COnt'd)
Содержание YORK SOLUTION LD09624
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