-3-
III. SPECIFICATIONS
Refrigerant Refrigerant Cond. Unit Amp
Model No. HP Type Charge Draw (LRA) Voltage Amps
UHT27 1/6 R-134a 8 oz. 4.0 120/60/1 3.4
UHT48 1/4 R-134a 12oz. 6.1 120/60/1 6.7
UHT60 1/4 R-134a 12oz. 6.1 120/60/1 6.7
ULT27 1/3 R-134a 9 oz. 7.2 120/60/1 6.7
ULT48 1/3 R-404A 14 oz. 8.9 120/60/1 10.0
ULT60 1/2 R-404A 14 oz. 10.8 120/60/1 12.0
UPT276 1/5 R-134a 9 oz. 4.5 120/60/1 4.3
UPT279 1/5 R-134a 9 oz. 4.5 120/60/1 4.3
UPT488 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT4812 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT4818 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT6012 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT6018 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT6024 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
IV. OPERATING DATA
Refrigerator Model: UHT27
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 43 lb. 43 lb.
End of Cycle 15 lb. 15 lb.
Discharge Pressure
Start of Cycle 68 lb. 71 lb.
End of Cycle 87 lb. 145 lb.
Freezer Model: ULT27
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 11 lb. 11 lb.
End of Cycle 0 lb. 1 lb.
Discharge Pressure
Start of Cycle 84 lb. 120 lb.
End of Cycle 116 lb. 164 lb.
VII. ELECTRICAL OPERATION (cont’d)
-20-
VII. b -
SEQUENCE OF OPERATION:
REFRIGERATION
1 - Conditions:
a. Unit connected to correct voltage.
b. Condensing unit controlled by thermostat.
c. Thermostat set to desired temperature.
d. Evaporator fan powered.
e. Cabinet temperature below set point.
f. High limit thermostat closed (freezer).
g. Power to thermostat contacts through defrost
timer 1/4 (freezer).
h. Door perimeter heater energized (freezer).
i. Defrost timer motor energized (freezer).
2- Temperature Rises Above Set Temperature:
a. Thermostat contact close, powering compressor.
3-
Set Temperature Is Met:
a. Unit returns to conditions in step 1.
VII. c - COMPONENT LOCATION:
VII. b -
SEQUENCE OF OPERATION (cont’d):
DEFROST MODE (freezer)
1 - Unit Operating In Refrigeration Mode.
2 - Defrost Intiated By Defrost Timer.
a. Defrost timer contacts 1/4 open.
1) Power removed from evaporator fan.
2) Power removed from thermostat contacts.
b. Defrost timer contacts 1/2 close.
1) Power to defrost heater.
3 - Defrost Time Expires.
a. Defrost timer contacts 1/2 open.
1) Power removed from defrost heater.
b. Defrost timer contacts 1/4 close.
1) Power to evaporator fan.
2) Power to thermostat.
4 - Unit Returns To Normal Operation Until The Next
Defrost Cycle.
27” Models
48” & 60” Models
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