Manitowoc QD1092N Specifications download pdf (Page 28)

Ice Machine Operation Section 3

3-4 Part Number 000001759

Remote

Q1060/Q1090

INITIAL START-UP OR START-UP AFTER

AUTOMATIC SHUT-OFF

1. Water Purge

Before the compressor starts, the water pump and water

dump solenoid are energized for 45 seconds, to

completely purge the ice machine of old water. This

feature ensures that the ice making cycle starts with

fresh water.

The harvest valve and harvest pressure regulating

(HPR) solenoid valves also energize during water purge,

although they stay on for an additional 5 seconds (50

seconds total on time) during the initial refrigeration

system start-up.

2. Refrigeration System Start-Up

The compressor and liquid line solenoid valve energize

after the 45 second water purge and remain on

throughout the entire Freeze and Harvest Sequences.

The water fill valve is energized at the same time as the

compressor. It remains on until the water level sensor

closes for 3 continuous seconds, or until a six-minute

time period has expired. The harvest valve and HPR

solenoid valves remain on for 5 seconds during initial

compressor start-up and then shut off.

The remote condenser fan motor starts at the same time

the compressor starts and remains on throughout the

entire Freeze and Harvest Sequences. (The compressor

and condenser fan motor are wired through the

contactor, therefore, anytime the contactor coil is

energized, the compressor and fan motor are on.)

FREEZE SEQUENCE

3. Prechill

The compressor is on for 30 seconds prior to water flow,

to prechill the evaporator.

4. Freeze

The water pump restarts after the 30 second prechill. An

even flow of water is directed across the evaporator and

into each cube cell, where it freezes. The water fill valve

will cycle on and then off one more time to refill the water

trough.

When sufficient ice has formed, the water flow (not the

ice) contacts the ice thickness probe. After

approximately 7 seconds of continual water contact, the

harvest sequence is initiated. The ice machine cannot

initiate a harvest sequence until a 6 minute freeze lock

has been surpassed.

Figure 3-5. Freeze Sequence (Typical Q460 Shown)

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 47 48

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Manitowoc QD1092N Specifications Page 28

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