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AUTOMATIC EXPANSION VALUE GT SERIES CABINETS
After the cabinet has been in operation for a short time the high pressure or discharge pressure of the
refrigeration system should be 250 pisg to 270 pisg in a 75
o
F ambient room. The suction pressure at the
compressor should be approximately 7 to 9 pisg *** . The cabinet does not have to be at operation
temperatures for the pressures to stabilize. The automatic expansion valves are basically preset and should
not need any adjustment for proper operation. If the system pressures are not correct and the valve does
need adjusting be aware that IN THE WORST CASE ONLY A VERY SMALL ADJUSTMENT MAY BE
REQUIRED. To increase the valve outlet pressure and thereby increase the suction pressure the adjusting
screw is turned in a clockwise direction as the valve is viewed with the adjusting screw pointed up. Be sure to
replace the red plastic cap covering the valve adjustment screw. After the pressure is set it SHOULD NOT
TEND TO CHANGE after additional run time or as the cabinet temperature changes. The sight glass, if install,
may not appear to be completely full. This is a normal condition. DO NOT INCREASE
the refrigerant charge
quantity above the listed charge because the sight glass does not show full.
*** Units used for boxed candy display should have the expansion valve adjusted to deliver 12
to 14psig at compressor suction port, this pressure is not suitable for ice-cream.
REFRIGERATION SYSTEM AND OPERATION
The cabinet utilizes a Copeland Copelametric 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 an automatic expansion valve to meter
refrigerant to the evaporator. They include automatic electric defrost systems which are time initiated (by the
time clock) and terminated by a defrost 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 insure 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 reaches
+80
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.
CLEANING
WARNING: DO NOT REMOVE FROST WITH A KNIFE, PICK, OR SHARP OBJECTS. DO NOT USE
ABRASIVE CLEANERS OR CAUSTIC CLEANERS OR SCOURING PADS
Every 30 to 60 days (depending on frost accumulation), the cabinet should be emptied, warmed up, and wiped
down using a solution of 1 teaspoon of baking soda with 1 quart of water. This solution will help eliminate
odors. Do not use strong soaps or detergents as they leave odors that can contaminate your product. The
GT line cabinets are equipped with a floor drain that exits out the lower rear of the cabinet. This exit has a
convenient garden hose fitting.
If it is not convenient to turn the power off the cabinet, lay a piece of plastic sheeting on the floor of the cabinet
and scrape the frost off walls using a plastic scraper. Do not use metal scrapers. This will damage the interior
paint of the cabinet.