8
The unit defrost is controlled by a timer in the control
box. After removing the condenser grille, the control
box will slide out until the defrost timer is visible. The
factory set defrost is two times in 24 hours with a
maximum timed interval of 30 minutes. The unit
contains a defrost termination sensor so in actual use
the defrost time will be less than 30 minutes in most
cases. The timer can be converted to operate for a
timed defrost termination by disconnecting the
blue/white from the X terminal. NOTE: When
disconnected, it is recommended that the terminal be
cut off of the blue/white wire and the wire end be capped
with a wire nut.
The defrost time is set by switching a white key from the
center to the outside edge of the dial. Each key is 15
minutes so two successive keys must be switched
outward for a 30 minute maximum time defrost. If it is
noted that more defrost time is needed, then switch
outward the third successive key for a 45-minute
maximum timed defrost. If another defrost in 24 hours
is needed then more keys can be switched outward as needed.
If possible, try to keep defrosts evenly spaced in
a 24 hour period.
The current time can be set by turning the outer dial in the direction of the arrow until the correct clock time is
shown and the small arrow aligns with either the AM or PM scale.
NOTE:
The cabinet serial number for the GT is on the data plate located on the end opposite the
condensing unit.
REFRIGERATION SYSTEM AND OPERATION
The cabinet utilizes a Hermetic compressor and operates with refrigerant 404A. Cabinet operates on 115/60/1
power. The cabinet has a bare tube type condenser, which virtually eliminates the possibility of condenser
blockage by dust and dirt.
The cabinet operates with a specific charge of refrigerant 404A. The amount of the charge of refrigerant is
listed on the cabinet nameplate in ounces. These systems use one or two captubes to meter refrigerant to the
evaporator. They include automatic electric defrost systems which are time initiated (by the timeclock) and
terminated by a defost termination thermostat which is mounted on a coil supporting bracket in the gravity coil
section directly beneath the top of the cabinet. This defrost termination overrides the time clock and turns the
compressor back on line when the gravity coil is defrosted. This is the point at which the coil has reached
sufficient temperature to incure complete defrost. If the defrost termination control should fail to operate, the
time clock will automatically turn off defrost and again turn on the compressor after the 34 minute (or the time
interval you selected) interval set on the time clock. If the time clock fails to turn the heaters off, a final back-up
safety thermostat will shut off the heaters when gravity coil temperature r80
o
F.
Cabinet has a refrigeration system known as automatic defrost gravity coil with cold wall construction. This
means the inner liner of the cabinet below the load level line is refrigerated by gravity flow of air from a fin and
tube coil, as well as copper refrigerant lines attached to the back of the inner liner tank on all sides and the
bottom.
30 Hour Dial
30 Hour Dial
Pointer
