Subcooler/Reheat Coil; Operating Sequences - Bryant Preferred Series Service And Maintenance Instructions

RH2.A
RH2.B
Fig. 14 — Perfect Humidity Valve Locations
CONDENSER COIL
OUTDOOR AIR
COMPRESSOR
Fig. 15 — Normal Cooling Mode – Perfect Humidity System
RH1.B
RH1.A
RH2.x
VALVE
RH1.x
VALVE
= CLOSED VALVE
= OPEN VALVE
= 3-WAY VALVE
11

Subcooler/Reheat Coil

The Subcooler/Reheat Coil is mounted across the leaving face of
the unit's evaporator coil. The coil is a one-row design with two
separate circuits.

Operating Sequences

The Perfect Humidity system provides three sub-modes of opera-
tion: Normal Cooling (see Fig. 15), Subcooling Reheat1 (see
Fig. 16) and Hot Gas Reheat2 (see Fig. 17).
The Reheat1 and Reheat2 modes are available when the unit is not
in a heating mode and when the Low Ambient Lockout Switch is
closed.
When there is only a single cooling demand (thermostat Y1 alone
or with thermostat Y2), one or both circuits will operate in Re-
heat2 mode. Both solenoids are energized in both circuits. See
Fig. 17, Hot Gas Reheat Schematic for system refrigerant flow.
When there is both cooling demand (thermostat Y1 demand) and
dehumidification demand, circuit 1 will operate in Reheat1
mode (Subcooling, Fig. 16) and circuit will operated in Reheat2
mode (Reheat, Fig. 17). In Reheat1 mode, the 3-way solenoid
valve is energized, opening the reheat coil to the refrigeration
flow path providing sub-cooling to the liquid before it enters the
TXV. See Tables 2-4 for Perfect Humidity connections, modes,
and troubleshooting.
PERFECT HUMIDITY
COIL
EVAPORATOR COIL
INDOOR AIR
TXV
VALVE