Specifications

JOHNSON CONTROLS
18
FORM 102.20-N1 (1109)
Economizer System - Typical
The Economizer system could typically consist of:
• Outdoor and return air dampers.
• Damper actuator.
• Enthalpy control.
• Minimum outdoor air adjustment.
• Exhaust air control.
The Economizer system provides the rst stage of
cooling whenever the outdoor air is cool and dry
enough to satisfy the internal cooling demand. The
outdoor and the return air dampers are operated by
individual actuators. As the outdoor air dampers are
opened by the damper actuator, the return air dampers
are closed.
If the economizer operation cannot satisfy the space
demand for cooling, stages can be energized as
needed.
Heating Operation
Various types of heating may be applied. Hot water
or steam coils maybe specied typically. Electric heat
and fuel burner heat are available.
Cooling Operation
Various types of cooling may be utilized. Factory
mounted chilled water coils or direct expansion
refrigerant coils may be specied for the YORK
Solution unit.
HAND IDENTIFICATION
Coil connections and other components are located and
described as left or right hand. The proper orientation
to describe the proper hand is when airow is at your
back, as shown in Fig. 2.
FAN SECTION
LEFT HAND (LH)
COIL CONNECTION
RIGHT HAND (RH)
COIL CONNECTION
RETURN AIR
INLET SECTION
OUTSIDE AIR
DRIVE HAND AND COIL HAND DETERMINED
BY FACING THE INLET SECTION
RIGHT
REAR
LEFT
FRONT
FIG. 2 – UNIT AND COIL HAND IDENTIFICATION
LD08004