Lennox LGT Series Unit Information page 45

L14 Reheat Coil Solenoid Valve
When Unit Controller input (Unit Controller J298-5 or
J299-8) indicates room conditions require dehumidifica-
tion, L14 reheat valve is energized (Unit Controller P269-
3) and refrigerant is routed to the reheat coil.
Reheat Setpoint
Reheat is factory-set to energize when indoor relative hu-
midity rises above 60% (default). The reheat setpoint can
be adjusted by changing Unit Controller Settings - Control
menu. A setting of 100% will operate reheat from an ener-
gy management system digital output. The reheat setpoint
can also be adjusted using an optional Network Control
Panel (NCP). Reheat will terminate when the indoor rel-
ative humidity falls 3% (57% default) or the digital output
de-energizes. The reheat deadband can be adjusted at
Settings - Control menu.
Check-Out
Test Hot Gas Reheat operation using the following proce-
dure.
1 - Make sure reheat is wired as shown in wiring
section.
2 - Make sure unit is in local thermostat mode.
3 - Select Unit Controller Service - Test.
The blower and compressor 1 (reheat) should be
operating. Reheat mode will be appear on the Unit
Controller display.
4 - Deselect Unit Controller Service - Test.
Compressor 1 (reheat) and blower should de-
energize.
Default Reheat Operation
TABLE 14
Reheat Operation - Two Cooling Stages - Default
T'stat & Humidity
Demands
Reheat Only
Reheat & Y1
Reheat & Y1 & Y2
*If there is no reheat demand and outdoor air is suitable,
free cooling will operate.
**If there is no reheat demand and outdoor air is suitable,
free cooling and compressor 1 will operate.
Operation
Compressor 1 Full Load
Reheat ON
Blower Low
Compressor 1 & 2 Full Load
Reheat ON
Blower High
Compressor 1 & 2 Full Load,
Reheat OFF
Blower High
Reheat Operation - Three Cooling Stages - Default
T'stat & Humidity
Demands
Reheat Only
Reheat & Y1
Reheat & Y1, Y2
Reheat & Y1, Y2, Y3
*If there is no reheat demand and outdoor air is suitable,
free cooling will operate.
**If there is no reheat demand and outdoor air is suitable,
free cooling and compressor 1 will operate.
Q-Needlepoint Bipolar Ionizer
The ionizer was designed for low maintenance. The device
should be checked semi-annually to confirm the brushes
are clean for maximum output. The ionizer is located on
the blower deck. See figure 36.
Page 45
TABLE 15
Operation
Compressor 1 Full Load,
Reheat ON, Blower Low
Compressor 1 & 2 Full
Load, Reheat ON, Blower
Medium
Compressor 1 & 2 Full
Load, Reheat ON, Blower
High
Compressor 1 & 2 Full
Load, No Reheat OFF,
Blower High
BIPOLAR IONIZER
IONIZER
ASSEMBLY
FIGURE 36