1.12 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS. Refer to figure 1-3.
Inside Coil Assembly (Volute). The inside coil assembly (1) carries either warm or cool refrigerant
depending upon the mode of operation. The refrigerant either heats or cools the shelter air as necessary.
Inside Blower. The inside blower (2) circulates the shelter air through the FDECU.
Outside Coil Assembly. The outside coil assembly (3) carries either cool or warm refrigerant depending
upon the mode of operation. The refrigerant is either heated or cooled by the outside (ambient) air as
Outside Fan Assembly.
The outside fan assembly (4) circulates outside (ambient) air through the
Compressor. The compressor (5) reduces pressure on the vapor at its' inlet, then compresses the vapor
and discharges under high pressure at its' outlet.
Electrical Resistance Heaters Assembly. The electrical resistance heaters assembly (6) contains two
banks of electric resistance heaters that are used independently or together to supplement the refrigerant
system heating capacity in low outside (ambient) temperature conditions.
Air Filter. The air filter (7) removes dust and debris from the shelter air as it passes through the FDECU.
Master Control Panel. The master control panel (8) is incorporated into the FDECU and provides all the
operator controls needed to start, operate, and stop the system as well as maintain, desired shelter air
Remote Control Panel and Cable. The remote control panel and cable (9) is mounted inside the shelter
and provides all the operator controls needed to start, operate, and stop the system as well as maintain
desired shelter air temperature.
Insulated Flexible Ducts. The insulated flexible ducts (10) connect between the FDECU and the shelter
to circulate shelter air through the system.
Electrical Power Input Cable. The electrical power input cable (11) is used to connect the FDECU to a
source of electrical power for operation.
Condensat e Drain Hose. The condensate drain hose (12) is used to carry condensate collected by the
inside coil during cooling operation to a suitable drain or collection area.
Sight Glass. The sight glass (13) allows for a visual inspection of the liquid refrigerant passing through
the system and is used to aid in diagnosing possible refrigerant system problems. The sight glass also
contains an indicator that changes color depending upon the amount of moisture contained in the