10TA Service Manual
HOW YOUR TUBE-ICE MACHINE WORKS
7/1/2014
4-2
Air-cooled machines have a solenoid valve (53), sometimes referred to as the “X” valve, in the
compressor discharge line, and a check valve (101) in the liquid return line to the receiver. These
valves prevent the migration of refrigerant when the machine is not operating. The "X" valve is open
any time the compressor is running.
Freeze Period. The Tube-Ice
®
is frozen inside the stainless steel tubes in the freezer (2) by the
direct application of refrigerant to the shell side (outside) of the tubes. The ice is produced from
constantly recirculating water during the freeze period. As the ice thickness increases, the freezer
suction pressure decreases. At a set pressure, the freezer pressure switch initiates the harvest period.
Harvest Period. When the freezer pressure switch (56, FPS) contact closes, a control relay (CR) is
energized. The “CR” relay stops the water pump and starts the cutter motor. The “A1” & "A2"
liquid line solenoid valves close , the “D” (thaw gas) solenoid valve opens and the thaw timer (T) is
energized.
The defrost pressure switch (dps) will open and close the "D" valve to maintain the proper pressure
to get the ice to release but not add unnecessary heat. As the ice releases and drops through the
rotating cutter and onto the cutter disc, it is discharged through the side opening of the water tank.
The harvest timer (T) is to be set for the time required to discharge all the ice plus 30 seconds longer
(usually 2 1/2 minutes).
! CAUTION !
Make sure all the ice clears the freezer with at least 30 seconds to spare
before the next freeze period begins. This is to prevent refreezing.
! CAUTION !
1
Control Panel
30
Receiver Sight Glass
1PG Suction Pressure Gauge 31 Gage Glass Stop Valve
2PG Discharge Pressure Gauge 32 A/C Condenser Service Connection
2 Freezer 34 Compressor Suction Service Valve
3 Compressor 35 Compressor Discharge Service Valve
4PS Dual High/Low Pressure Switch 37 Oil Charging/Drain Valve
5M Cutter Motor 39 Water Tank Drain Valve
5R Gear Reducer 40 Automatic Water Tank Blowdown
6 Water Pump 41 Condenser Water Regulator (W/C Machines)
7 Water Tank (includes cutter assembly) 41A Condenser Pressure Control (A/C Machines)
8 Water Distributing Chamber 43 Strainer
12 Make-Up Water Float Valve 44 Receiver Drain Valve
13 Heat Exchanger 46 Filter Drier
14 Oil Separator 48 Muffler
15 Condenser 50 Receiver Safety Valve
15R Receiver 51 Freezer Safety Valve
16 Thawing Chamber 53 Cold Weather Solenoid Valve “X” (A/C Machines)
17 Expansion Valve 55 Discharge Line Stop Valve For A/C Machines
18 Thawing Gas Solenoid Valve “D” 56 Freezer/Pressure Switch
18S Thawing Gas Pressure Switch 58 Liquid Outlet Valve (King Valve)
20 Liquid Feed Solenoid Valve “A1” 59 Receiver Purge Valve
21 Liquid Feed Solenoid Valve “A2” 69 Freezer Pressure Stop Valve
22 Float Switch 70 Oil Return Stop Valve
23 Condenser Water Inlet W/C Machines 88 Accumulator/Heat Exchanger
23A Make-Up Water Inlet 3/4 FPT 90 Thawing Gas Stop Valve
24 Condenser Water Outlet (W/C Machines) 91 Receiver Liquid Return Stop Valve
25 Water Tank Drain Connection (1” FPT) 94 Compressor Oil Pressure Safety Control
28 Refrigerant Charging Valve
101 Check Valve
TABLE 4-1
Piping Nomenclature
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