Freeze Period; Harvest Period - Vogt TUBE-ICE 03TB Service Manual

4-2
HOW YOUR TUBE-ICE
discharge line, and a check valve (101) in the liquid return line to the receiver. These valves prevent
the migration of refrigerant to the condenser when the machine is not operating.
Freeze Period The Tube-Ice
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 "A" (liquid line)
solenoid valve closes, the "D" (thaw gas) solenoid valve opens and the thaw timer (T) is energized.
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).
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.
Item No. Description
1 Control Panel
2 Freezer
3 Compressor
4PS Dual High/Low Pressure Switch
5M Cutter Motor
5R Gear Reducer
6 Water Pump
6A Water Pump Check Valve
7 Water Tank (includes cutter assembly)
8 Water Distributing Chamber
12 Make-up Water Float Valve
13 Heat Exchanger
14 Oil Separator
15 Condenser
15R Receiver
16 Thawing Chamber
17 Thermal Expansion Valve
18 Thawing Gas Solenoid Valve ("D" Valve)
20 Liquid Feed Solenoid Valve ("A" Valve)
23 Condenser Water Inlet (W/C Machines Only)
24 Condenser Water Outlet (W/C Machines Only)
25 Water Tank Drain Connection (3/4" FPT)
28 Refrigerant Charging Valve
30 Receiver Gage Glass
31 Gage Glass Stop Valve
3/31/2014
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MACHINE WORKS
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is frozen inside the stainless steel tubes in the freezer (2) by the direct
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Piping Nomenclature
CAUTION !
CAUTION !
Item No. Description
32 A/C Condenser Service Connection
34 Compressor Suction Service Valve
35 Compressor Discharge Service Valve
37 Oil Charging/Drain Valve
39 Water Tank Drain Valve
40 Automatic Water Tank Blowdown
41 Condenser Water Regulator (W/C Machines Only)
41A Condenser Pressure Control (A/C Machines Only)
43 Liquid Feed Solenoid Valve Strainer
46 Filter Drier
48 Muffler
50 Receiver Safety Valve
51 Freezer Safety Valve
52 Condenser Safety Valve (W/C Machines Only)
53 Cold Weather Solenoid Valve "X" (A/C Machines Only)
55 Discharge Line Stop Valve
56 Freezer Pressure Switch (Inside Control Panel)
58 Liquid Outlet Valve (King Valve)
69 Freezer Pressure Stop Valve
88 Accumulator/Heat Exchanger
90 Thawing Gas Stop Valve
91 Receiver Liquid Return Stop Valve
94 Compressor Oil Pressure Safety Control
101 Check Valve
TABLE 4-1
03TA Service Manual