Hitachi FS3 Series, Service Manual

Page: 235 / 240

5
FIELD WORK INSTRUCTION
5
Example:
Room R (kg) V (m³) C (kg/m³) Countermeasure
A 50 300 0.17 -
B 110 1000 0.11 -
C 60 175 0.34 0.06 m² Opening
D 60 175 0.34 0.06 m² Opening
C+D 60 350 0.171 -
E 60 100 0.6
2 m³/min Ventilator Linked with
Gas Leak Detector
Example:
British Standard BS4434 1989
R22 Commercial Office Building Class D Occupancy
MR = CxV
MR: Maximum Charge or Leakage of Refrigerant (kg)
C: Maximum Allowable Concentration = 0.17 (kg/m³)
V: Volume of Space (m³)
5.8. MAINTENANCE WORK
n
For Indoor Unit and Outdoor Unit
1. Fan and Fan Motor
Œ
Lubrication: All fan motors are pre-lubricated and
sealed at the factory. Therefore, no lubricating
maintenance is required.
Œ
Sound and Vibration: Inspect for abnormal sound and
vibration
Œ
Rotation: Inspect for clockwise rotation and rotating
speed.
Œ
Insulation: Inspect for electrical insulation resistance.
2. Heat Exchanger
Œ
Clog: Inspect and remove any accumulated dirt and
dust from the heat exchanger at regular intervals. As
for outdoor unit, other obstacles such as growing
grass and pieces of paper, which might restrict air
flow, should also be removed.
3. Piping Connection
Œ
Leakage: Inspect for refrigerant leakage at piping
connection.
4. Cabinet
Œ
Stain and Lubrication: Inspect and remove any stain
and lubrication.
Œ
Fixing Screw: Inspect and fix loosened or lost screws.
Insulation: Inspect and repair peeled thermal
insulation material on cabinet.
5. Electrical Equipment
Œ
Activation: Inspect for abnormal activation of the
magnetic contactor, auxiliary relay, PCB and etc.
Œ
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.
6. Control and Protective Devices
Œ
Setting: Do not readjust the setting in the field unless
the setting is maintained at a point other than the
point listed in "9.6. SAFETY AND CONTROL DEVICE
SETTING" of "TC"
n
For Indoor Unit
1. Air Filter
Œ
Cleaning: Inspect and remove any accumulated dirt
and dust according to "18.2 Filter Cleaning" of "TC".
2. Drain Pan, Drain - up Mechanism and Drain Pipe
Œ
Drain Line: Inspect and clean the condensate drain
line at least twice a year.
Œ
Drain-up Mechanism: Inspect for activation of drain-up
mechanism.
3. Float Switch
Œ
Activation: Inspect for activation of float switch.
n
For Outdoor Unit
1. Compressor
Œ
Sound and Vibration: Inspect for abnormal sound and
vibration.
Œ
Activation: Inspect for that the voltage drop of power
supply line is within 15% at start and within 2% during
operation.
2. Reverse Valve
Œ
Activation: Inspect for any abnormal activating sound.
3. Strainer
Œ
Clog: Inspect for that no temperature difference
between both ends.
4. Earth Wire
Œ
Earth Line: Inspect for continuity to the earth.
5. Oil Heater
Œ
Activation: The oil heater should be activated at least
12 hours before start- up, by switching ON the main
power source.
Opening: 0.06 m²
Gas Leak Detector
Ventilator 2 m³/min
Floor
70 m² Floor
70 m²
Floor 400 m²
Floor 120 m²
Floor
40 m²
H
e
ight
2.5
m
System B Outdoor Unit
System A Outdoor Unit
System A
Refrigerant: 60 kg
E
D
C
B A
System B
Refrigerant: 50 kg