Lennox LCH036 Installation Instructions Manual page 90

Hot Gas Reheat Start-Up And Operation
General
Hot gas reheat units provide a dehumidifying mode of
operation. These units contain a reheat coil adjacent to
and downstream of the evaporator coil. Reheat coil
SUPPLY
AIR
STAGE 1
COMPRESSOR
STAGE 2
COMPRESSOR
SUPPLY
AIR
STAGE 1
COMPRESSOR
STAGE 2
COMPRESSOR
REHEAT MODE REFRIGERANT ROUTING
STAGE 2
EVAPORATOR
COIL
STAGE 1
EVAPORATOR
COIL
REHEAT
COIL
CHECK
VALVE
COOLING MODE REFRIGERANT ROUTING
STAGE 2
EVAPORATOR
COIL
STAGE 1
EVAPORATOR
COIL
REHEAT
COIL
CHECK
VALVE
solenoid valve, L14, routes hot discharge gas from the
compressor to the reheat coil. Return air pulled across
the evaporator coil is cooled and dehumidified; the
reheat coil adds heat to supply air. See figure 29 for
reheat refrigerant routing and figure 30 for standard
cooling refrigerant routing.
RETURN
AIR
EXPANSION
VALVE
REHEAT
VALVE
FIGURE 29
RETURN
AIR
EXPANSION
VALVE
REHEAT
VALVE
FIGURE 30
Page 40
OUTDOOR
AIR
TWO
CONDENSER
FANS
STAGE 2
CONDENSER
COIL
STAGE 1
CONDENSER
COIL
OUTDOOR
AIR
TWO
CONDENSER
FANS
STAGE 2
CONDENSER
COIL
STAGE 1
CONDENSER
COIL