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
Summary of Contents for P18FXT
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