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LGH/LCH420, 480, 540, 600
Check-Out
Test hot gas reheat operation using the following
procedure.
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, compressor 1, and compressor 2 (reheat)
should be operating. Reheat mode will appear on the Unit
Controller display.
Reheat Operation
The following conditions must be met before reheat will be
energized:
1- Blower must be operating.
2- System must be in occupied mode.
3- System must NOT be operating in heating mode.
4- One cooling demand is required if the unit has been in
heating mode, the Unit Controller has been reset, or at
initial unit start-up.
IMPORTANT - Free cooling does not operate during
reheat. Free cooling will operate as shown in the Unit
Controller manual.
Reheat will operate as shown in table 24.
Units are shipped from the factory to provide two stages of
cooling.
Three stages of cooling is available in zone sensor mode.
Three stages of cooling is also available by installing a transfer
relay and a three-stage thermostat; set parameter 111 to 3.
Four stages of cooling is available in zone sensor mode on
units with four compressors.
Compressors are not de-energized when unit operation
changes from cooling to reheat or from reheat to cooling.
Instead, L14 and L30 reheat valves are energized (reheat)
or de-energized (cooling).
NOTE - Another thermostat staging option is available
which allows both compressors to be energized during free
cooling. See Unit Controller manual for details.
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