Honda HondaJet HA-420 Pilots Operating Manual page 153

Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION
A Compressor Drive Module (CDM) delivers high temperature, high
pressure gas to the condenser via refrigerant hoses. In the condenser, the
refrigerant changes phase to a high temperature, high pressure liquid as
ambient (cooling) air passing through the condenser. The liquid
refrigerant exits the condenser and passes through a receiver dryer
designed to remove small amounts of moisture within the refrigerant
system. The refrigerant flows to an expansion valve on the Forward
evaporator and to the expansion valve on the Aft evaporator. The
expansion valves provide a pressure drop for the liquid refrigerant and
each evaporator vaporizes the low temperature, low pressure refrigerant
causing the evaporators to become cold, extracting heat and moisture
from the aircraft cabin air. This cool, dry air exits the evaporator and is
then forced through the aircraft system distribution ducts via the
evaporator fans. If the Air Conditioner is off, the evaporator fans will
only recirculate cabin air. Evaporator coil condensation is drained
overboard. The refrigerant vapor travels back to the compressor inlet
from the evaporator outlets as a low temperature, low pressure gas where
the cycle is repeated.
Temperature Control
When the Environmental system is selected to the Normal mode
operation of the Air Conditioner is automatic based on the cockpit and
cabin target temperatures set using the CDU Thermostat page.
Evaporator fan speed is normally controlled by the system to one of the
eight speeds. Fan speed can be manually controlled by selecting the
Manual mode. Cabin target temperature and fan speed can also be
controlled, within a limited range, from the cabin if the Cabin Control
mode has been selected on the Thermostat page.
HJ1-29000-005-001
October 30, 2016 1-137
FOR TRAINING PURPOSES ONLY