Specifications

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
Humidier Option (Electric) ...............................................................................................................2-43
Humidier 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 Airow ...............................................................................................2-59
VAV Systems .............................................................................................................................2-59
TABLE OF CONTENTS (CONT'D)