Hitachi Set Free mini-HNRQ1 Series, Service Manual

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167
FIELD WORK INSTRUCTIONS
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Line Condition - Pay attention to working voltage, amperage and phase balance. Inspect for faulty
contact caused by loosened terminal connections, oxidized contacts, foreign matter, and other items.
Inspect for electrical insulation resistance.
(f) Control and Protective Devices
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Setting - Do not readjust the setting in the field.
(2) For Outdoor Unit Only
(a) Compressor
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Sound and Vibration - Inspect for abnormal sounds or vibration.
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Activation - Check that the voltage drop of the power supply line is within 16% at start and within 2%
during operation.
(b) 4-Way valve
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Activation - Inspect for any abnormal activating sound.
(c) Strainer
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Clogging - Check that there is no temperature difference between the ends.
(d) Ground Wiring
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Ground Line - Inspect for continuity to the earth ground.
(e) Crankcase Heater
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Activation - Apply power to the outdoor unit(s) at least 12 hours prior to operation of the system for
preheating of the compressor oil.
(3) For Indoor Unit Only
(a) Air Filter
●
Cleaning - Inspect for, and remove, any accumulated dirt and dust and remove.
(b) Drain Pan, Condensate Mechanism and Condensate Pipe
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Drain Line - Inspect and clean the condensate line at least twice a year.
●
Drain-Up Mechanism - Inspect for activation of drain-up mechanism.
(c) Float Switch
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Activation - Inspect for activation of float switch.