Vogt P118F/HE100, Руководство по обслуживанию, Страница: 42 / 126

05TA Service Manual
HOW YOUR TUBE-ICE

MACHINE WORKS
7/19/2013
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 to the condenser when the machine is not operating.
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 “A” (liquid line)
solenoid valve closes, 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 !
Item No. Description Item No. Description
1 Control Panel 31 Gage Glass Stop Valve
1PG Suction Pressure Gauge 32 A/C Condenser Service Connection
2PG Discharge Pressure Gauge 34 Compressor Suction Service Valve
2 Freezer 35 Compressor Discharge Service Valve
3 Compressor 37 Oil Charging/Drain Valve
4PS Dual High/Low Pressure Switch 39 Water Tank Drain Valve
5M Cutter Motor 40 Automatic Water Tank Blowdown
5R Gear Reducer 41 Condenser Water Regulator (W/C Machines)
6 Water Pump 41A Condenser Pressure Control (A/C Machines)
6A Water Pump Check Valve 43 Strainer
7 Water Tank (includes cutter assembly) 44 Receiver Drain Valve
8 Water Distributing Chamber 46 Filter Drier
12 Make-Up Water Float Valve 48 Muffler
13 Heat Exchanger 50 Receiver Safety Valve
14 Oil Separator 51 Freezer Safety Valve
15 Condenser 52 Condenser Safety Valve
15R Receiver 53 Cold Weather Solenoid Valve “X” (A/C Machines)
16 Thawing Chamber 55 Discharge Line Stop Valve
17 Hand Expansion Valve 56 Freezer/Pressure Switch
18 Thawing Gas Solenoid Valve “D” 58 Liquid Outlet Valve (King Valve)
18S Thawing Gas Cycling Pressure Switch “DPS” 59 Receiver Purge Valve
20 Liquid Feed Solenoid Valve “A” 69 Freezer Pressure Stop Valve
22 Float Switch 70 Oil Return Stop Valve
22A Float Switch Stop Valves 88 Accumulator/Heat Exchanger
23 Condenser Water Inlet W/C Machines 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/CoreSense
28 Refrigerant Charging Valve 101 Check Valve (A/C Machines)
30 Receiver Gage Glass
Table 4-1
Piping Nomenclature