Lennox LCH092H Unit Information page 60

Free
Free Cooling
Cooling
Setpoint
Mode
TEMP OFFSET
TEMP OAT STPT
Remote Remote
ENTH DIFF OFFSET
ENTH ODE STPT
GLOBAL GLOBAL
*
Enthalpy includes effects of both temperature and humidity.
**Energy management systems may require additional field-provided sensors; refer to manufacturer's instructions.
ECONOMIZER MODES AND SETPOINT
Field-
Dampers will modulate to 55
Provided
discharge air (RT6) when outdoor air is suitable:
Sensors
Outdoor air temperature (RT17) is less than return air temperature (RT16)
None Needed
by at least the OFFSET value (10
Outdoor air temperature (RT17) is less than the OAT STPT value (75
None Needed
default; parameter 160).
Either of the TEMP modes can be used when a network OAS signal is pro­
Energy vided by an energy management or building control system, via BACnet,
Management LonTalk, or L Connection. The network can command OAS, NOT OAS, or
System**
AUTO. AUTO returns to local control of OAS, which is the selected TEMP
mode.
Outdoor air enthalpy* (A7) is less than return air enthalpy (A62) by at least
(Two) C7400
the OFFSET value (1mA = 2
Outdoor air enthalpy (A7) is less than free cooling setpoint (12mA = 75
C7400
default, parameter 162).
Global input is energized by (P297-9). This setting is also used for outdoor
24VAC Input
air damper applications. Global input also brings on the blower. (This mode
Signal is NOT used when OAS signal is provided via network connection. GLO is
only used when a 24VAC signal is used to energize the P297-9 GLO input.)
ECONOMIZER
ECONOMIZER
TABLE 24
°
F (default, parameter 159)
°
F default; parameter 161).
°
F default; parameter 163).
FIGURE 29
Page 60
Input Ranges
°
F
°
F
ACCESSORY
PANEL MULLION
DIVIDER PANEL
(Attach with two
provided screws)
BOTTOM OF
COMPRESSOR
SECTION
FLANGED
RETURN AIR
OPENING
°
0-40 F
°
41-75 F
NA
0mA-4mA
12-19mA
NA