Check Items In Daily Operation; Caution On Handling Of R407C; Refrigerant - Hitachi RCUE40AG2 Service Manual

Maintenance

6.5. Check items in daily operation

6.5. Check items in daily operation

6.5. Check items in daily operation
Check items
1 Check of around of chiller unit
Pressure, quantity and quality of chilled (heating)
2
water
3 Pipe of chilled (heating) water
4 Check of screws and bolts etc
5 Re-tightening of electrical wiring terminal
6 Leakage of water pipe
7 Dirtiness of air side heat exchanger
8 Clogging of drain pump
9 Cleaning of inside/outside of machine room
10 Compressor
11 Air side heat exchanger
12 Water side heat exchanger
13 Expansion valve
14 4 way valve (only cooled heat pump)
15 Solenoid valve
16 Stop valve
17 Strainer
18 Pipe, capillary tube
19 High pressure block switch
20 Cleaning of inside/outside of unit
21 Interphase voltage of compressor
22 Vibration and noise
Operation adjustment and automatic operation
23
mechanism
24 High pressure block switch
25 Indication light
26 4 way valve (only cooled heat pump)
27 Solenoid valve
28 Instruction on operation method
29 Inlet temperature of chilled (heating) water
30 Outlet temperature of chilled (heating) water
Inlet DB(WB) temperature of air side heat
31
exchanger
32 Water fl ow of water side heat exchanger
33 High pressure
34 Low pressure
35 Operation voltage
36 Operation current

6.6. Caution on handling of R407C

6.6. Caution on handling of R407C

6.6. Caution on handling of R407C

6.6.1. Refrigerant

The refrigerant is HFC type refrigerant whose ozone destruction coeffi cient is ZERO. If other refrigerant is
mixed, the property of refrigerant is changed and may cause a problem. The following points should be taken
into account on its handling.
Refrigerant should be added in liquid state not in gas state. R407C is nonazeotropic refrigerant mixture,
−
and compositions of boiling point are different. Therefore, if it is added in gas state, refrigerant, easy to
evaporate, is added and refrigerant, hard to evaporate, remains in a refrigerant tank.
Confi rm if the tanks specialised for R407C.
−
The tank should be set so that refrigerant can be added in gas state.
−
The valves or hose for charge should be specialised for R407C.
−
pag. 160
SMGB0003 rev.0 - 11/2006
Check contents
Remove the obstacle
Check them while pouring water
Re-tighten those which are loosed
Re-tighten all by driver
Confi rm it while pouring water
Clean it by pouring hot (40°C) water.
Confi rm it while pouring water
Check valves, fl are parts,
welding parts etc.
More than 180V
Check compressor, fan, pipe etc.
Check the activation of ON, OFF,
temperature adjustment
Check the activation value and setting Check the activation value and setting
value.
Check the state of switch from cooling Check the state of switch from cooling
to heating and vice versa.
Result (write the value or X )
Good / NG
Good / NG
Good / NG
Tightened / No tightened
Tightened / No tightened
Yes / No
Done / No done
Yes / No
Done / No done
Good / NG
Good / NG
Good / NG
Good / NG
Good / NG
Good / NG
Good / NG
Good / NG
Good / NG
Good / NG
Done / no done
Good / NG
Abnormal / Normal
Good / NG
Good / NG
Good / NG
Good / NG
Good / NG
Done / No done
°C
°C
°C ( °C)
m3/h
MPa
MPa
V
A