Hoshizaki FTW 177, Manual

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4) When unbrazing the refrigeration circuit connections, check that the circuit is
completely evacuated. The refrigerant may produce a poisonous gas when
coming in contact with an open flame.
5) Do not braze in an enclosed room to prevent carbon monoxide poisoning .
6) In case of a refrigerant leak, locate and repair the leaking part completely
before recharging the refrigerant and checking for further leaks. If the leaking part
cannot be located, be sure to check again for further leaks after recharging the
refrigerant. Leaked refrigerant may produce a poisonous gas when coming in
contact with an open flame of a gas cooking stove or a fan heater.
7) Before servicing, check the surface temperature of the refrigeration circuit to
prevent a burn.

Keep the following in mind when making electrical connections.
1) Check for proper earth connections, and repair if necessary to prevent electric
shocks.
2) Always use service parts intended for the applicable models for replacement of
defective parts. Use proper tools to secure the wiring. Otherwise abnormal
operation or trouble may occur and cause electric shocks.
3) Check for proper part installations, wiring condition and soldered or soloderless
terminal connections to avoid fire, heat or electric shocks.
4) Be sure to replace damaged or deteriorated power cords and lead wires to
prevent fire, heat or electric shocks.
5) Cut-off lead wires must be bound using closed end connectors or the like, with
their closed ends up to avoid entrance of moisture that could lead to electric leaks
or fire.
6) After servicing, always use a megohmmeter(500V DC)to check for insulation
resistance of at least 1 megohm between the live part and dead metal part.
7) Do not service the electrical parts with wet hands to prevent electric shocks.
8) The capacitors used for the compressor and the other components may be
under high voltage and should be discharged properly before servicing.