Vogt P18AL TUBE-ICE, Service Manual

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P18AL Service Manual
INSTALLING YOUR TUBE-ICE
®
MACHINE
3/6/07
3-3
Make-Up Water In. The water required for ice making must be potable water, safe for human
consumption, and should be of the highest quality available. The best way to determine water
quality is to have a complete water quality analysis by a qualified laboratory.
It is advisable to install a particle filter in the make-up and flushing water lines to trap dirt, sand,
rust, or other solid particles prior to entering the water tank and contaminating the ice. Be sure to
size the filter large enough to meet the water demands of 15 GPM (peak flow), allowing for a
restriction through the filter as it traps these particles. Minimum required supply pressure is 30 psig.
Water Tank Drain.
This valve and connection is for the purpose of flushing and draining the water
tank of impurities, foreign material and cleaning chemicals used during servicing. It should be piped
to an open drain or sump for visible discharge. It can be tied in with the overflow line but no others.
Water Tank Overflow
. A 2” FPT connection on the side of the water tank is provided to carry
away overflow water during the thawing (harvest cycle). This water contains ice fines accumulated
during harvesting and dissolved solids accumulated during the freezing cycle.
Do not reduce the
size of this line . Three inches is needed to provide sufficient area for ice fines to be flushed out,
especially if the incoming flushing water is 55
°
F (13
°
C) or below. This overflow line should not tie
in with any other drain line except the water tank drain.
Unless water quality is superior, do not discharge the overflow water to the cooling tower system.
This water contains additional dissolved solids left from the ice making process and can lead to
excessive condenser fouling or cooling tower chemical usage. It is recommended that a heat
exchanger be used in place of direct contact with condenser water.
Water Tank Flush Valve.
Flushing water (blowdown) is necessary to melt ice fines and flush
dissolved solids from the water tank during the thawing (harvest) cycle. This function is important
and helps to maintain good ice quality. If water quality is superior, this blowdown can be reduced
by installing a smaller orifice in the flushing outlet elbow. Make sure there is enough flushing water
to prevent the accumulation of excessive ice fines in the tank.
If make-up and flushing water are from the same source, they can be connected by a common line to
the machine.
Receiver
The receiver used to supply hot thaw gas must be sized adequately to provide sufficient
thaw gas. Table 3-2 shows the volume required to hold the refrigeration charge of the freezer and
the hot gas required for the thaw cycle. It is recommended that a heating coil be installed in the
receiver to assure that the liquid ammonia is at saturated temperature at the start of each thaw period.
Note: Additional storage volume may be required for the interconnecting piping. Add volume of
interconnecting piping to the values shown in Table 3-2
RECEIVER VOLUME (Cubic Feet)
MODEL With Heating Coil With out Heating Coil
P18AL 10 15
TABLE 3-2
Receiver Volume Requirements