IceTech FDHD Series, Руководство по обслуживанию

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SERVICE MANUAL
21
5. SEQUENCE OF OPERATION -MODULAR MODELS (MS)
Initial Start-up: The pump and the drain electro valve are energized during 30 seconds to empty
the water tray preventing the scale build-up in water. Then the pump and the drain electro valve
are de-energized, and the water inlet valve is energized filling the water tray until the water level
sensor detects the water reaches the appropriate level. Then the freeze sequence starts.
Freeze sequence: The compressor is energized and the water pump is energized after 30
seconds. The water inlet valve is also energized at the same time that the water pump to replenish
water level and then de-energized. The compressor and water pump will continue energized until
the thickness sensor detects the thickness of the ice slab is the appropriate. Then the harvest
sequence starts.
Harvest sequence: The compressor will continue energized. The hot gas valve is energized
throughout the harvest phase to divert hot refrigerant gas into the evaporator. The water pump
and the drain electrovalve are energized during 45 seconds to empty the water tray and remove
mineral deposits. After this (water pump and drain electrovalve de-energized) the water inlet valve
is energized filling the water tray until the water level sensor detects water reaches the level. The
ice slab slides off the evaporator and into the bin. The momentary opening and re-closing of the
shield indicates the harvest sequence has finished and goes to the freeze sequence. If curtain
remains opened for more than 30" the machine switch to the status of full bin stand-by
5.1.- INITIAL START-UP
It is carried out at machine work start in following cases (being all outputs switched off):
- when machine is connected to power supply.
- when the switch is turned to the ICE position
- after a stop due to full storage
During start-up time t4 the pump (B) and the drain valve (EP) are activated.
Subsequently, B and EP are closed and the water inlet valve (EW) is opened until the level sensor
(NW) indicates that the storage reservoir is filled with water. At this point, the production phase
starts.
Please note: If at this stage the curtain (MC) is open, the indicated machine status is switched to
full storage (full).