Hitachi Set Free mini-HNRQ1 Series, Service Manual

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FIELD WORK INSTRUCTIONS
1. Caution for Refrigerant Leakage
Make sure that the entire VRF system meets the local codes, regarding Safety.
2. Modifications of Charging Refrigerants
The company’ air conditioners are designed and manufactured based on using specified refrigerants. The
applicable refrigerants are specified for each unit’s models.
Using any refrigerants besides the specified refrigerants may cause mechanical problems, malfunction,
and failure, and in the worst case, it endangers safety seriously and may cause a fire or an explosion.
Therefore, do not charge non-specified refrigerants or any of the following in the refrigerant system of a unit.
● Hydrocarbon Refrigerants such as Propane
● Oxygen, or Flammable Gases such as Acetylene
●
Poisonous Gases
The types of refrigerants are indicated in the Installation and Maintenance Manuals, Engineering Manuals,
Service Manuals, and the specification label for each unit. Be aware that the company does not take any
responsibility for unit failure, malfunction, or any accidents caused by charging non-specified refrigerants or
others as noted above.
3. Maintenance Work
(1) For Outdoor Unit and Indoor Unit
(a) Fan and Fan Motor
●
Lubrication - All fan motors are pre-lubricated and sealed at the factory. Therefore, no lubricating
maintenance is required.
●
Sound and Vibration - Inspect for abnormal sounds or vibration.
●
Rotation - Check that the fan rotates counterclockwise and inspect the rotating speed.
●
Insulation - Inspect for electrical insulation resistance.
(b) Heat Exchanger
●
Clogging - Inspect for any accumulated dirt and dust and remove any at regular intervals. As foran
outdoor unit, other obstacles such as growing grass and pieces of paper, which might intercept air
flow, should also be removed.
(c) Piping Connection
●
Leakage - Inspect for refrigerant leakage at piping connections.
(d) Cabinet
●
Stain and Lubricant - Inspect for any stain or lubricant and remove it, if any.
●
Securing Screw - Inspect for loose or missing screws and secure or replace as required.
●
Insulation - Inspect for peeling thermal insulation material on the cabinet and repair it, if any.
(e) Electrical Equipment
●
Activation - Inspect for abnormal activation of the magnetic contactor, auxiliary relay, or printed circuit
board (PCB).