Vogt P-34AL-15 Service Manual Download

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P34AL-15 & P34ALOF-15 Service Manual

INSTALLING YOUR TUBE-ICE MACHINE

9/22/05

3-8

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 3” 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.

Receiver.

The receiver used to supply hot thaw gas must be sized adequately to provide sufficient

thaw gas. Table 3-2 shows the minimum 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. The receiver must be located inside a suitable building and must not be subjected
to ambient temperatures below 50

F (10

C) or above 110

F (43.3

C).

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

P34AL

60 80

TABLE 3-2

Receiver Volume Requirements

Thaw Gas Pressure Regulator.

The thaw gas pressure regulator is a 2 1/2” solenoid operated

pressure combination regulator and shut-off valve (see figures 1-1 and 1-4 for locations).

Do not

reduce the size of this line or connect to the compressor discharge piping

. This valve is

designed to carry the proper amount of thaw gas to the evaporator during the harvest cycle. See
Section 5-7 for operating instructions.

Suction Pressure Regulator. When a machine is attached

to a central refrigeration system a

pressure regulator will be required (see Figures 3-12 through 3-16 for location and general piping
arrangement). This regulator (usually furnished by the purchaser) must be a combination
backpressure regulating and stop type valve. The usual minimum pressure drop across this type
valve is 2 psig, therefore the valve must be set to maintain a freezer pressure at least 2 psi above the
maximum general suction pressure. For improved control during pull-down it is recommended that
a by-pass be installed around the suction regulator.

Compressor Unloading.

When a P34AL-15 is attached to a dedicated compressor system,

unloading of the compressor will be required. A minimum compressor unloading during the harvest