Control Board; Start-Up Delay - Hoshizaki HUR40A(-D) Service Manual

C. Control Board
• A Hoshizaki exclusive solid-state control board is employed in all Hoshizaki
refrigerators and freezers.
• All models are pretested and factory-adjusted.
1. Fragile, handle very carefully.
2. The control board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the metal
part of the unit when handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the board to
prevent damage to the board.
4. Do not attempt to repair the board in the field. Always replace the whole
board assembly if it goes bad.
5. Do not short out power supply to test for voltage.
6. Keep the thermistor leads, clogged filter sensor leads, and pressure switch
leads at least 1.5" away from high voltage leads (AC 100 volts or more) to
protect against electrical noise.

1. Start-Up Delay

The start circuit of the compressor is timed such that at power-up and during any
compressor off time, there will be at least a 2-minute delay before the compressor will
start. This delay is controlled through the control board. To bypass the startup delay,
move the power switch to the "OFF" position. Then press and hold the up arrow key
while moving the power switch to the "ON" position.
Note: The compressor must run a minimum of three minutes during each run cycle.
CAUTION
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