Check Function - Hitachi RCUE40AG2 Service Manual

Troubleshooting

5.1.6. Check function

Check mode

By pressing [▲] (SW3) on PCB more than 3 seconds, control state of chilled water temperature, each
refrigerant cycle pressure/ temperature etc are indicated. (it is possible both during stopping and during
running), (*mode shall not be shifted in case of alarm).
Pressing again [▲] (SW3) on PCB more than 3 seconds enables you to see the different values but with
decimals
By pressing [▲][▼], indication is changed. The followings are the contents.
Example of code indication (alternately
Item
Latest
protection
device state
(alarm code) (alarm code)
  
   
   
   
   
   
Refrigerant
cycle state
   
  
  
   
    
pag. 104
SMGB0003 rev.0 - 01/2007
  
Normal indication State
- Nº 1 cycle (C1)
- During cooling (Co)
fl icker)
  
.  
.  
. 
 



  
Indication of check mode
Press more than 3 sec.
Contents
In case of latest alarm = activation of No. 1 high pressure
block device
(if alarm code is not saved, it is "00-00".
1. Pd (high pressure) indication [MPa]
-Example of Pd of No.1 = 1.42MPa
-Example of Pd of No. 2 = 1.43MPa
} }
Indication of unit of 2 cycles
(Indication of only the unit whose manual set SW is ON)
2. Ps (low pressure) indication [MPa]
-in case of Ps of No. 1 = 0.41MPa
-In case of unit of 2 cycles, [C2-PS].
3. Td (discharge gas temp) indication [ºC]
-in case of Td of No. 1 = 81ºC
-In case of unit of 2 cycles, [C2-td].
4. Ts (suction gas temp) indication [ºC]

-in case of Ts of No. 1 = -2ºC
-In case of unit of 2 cycles, [C2-tS].
5. Tr (Plate heat exchanger inlet refrigerant temp)
indication [ºC]

-in case of Td of No. 1 = 5ºC
-In case of unit of 2 cycles, [C2-tr].
6. Te (Refrigerant liquid temp) indication [ºC]

-in case of Te of No. 1 = 35ºC
-In case of unit of 2 cycles, [C2-tE].
7. Inlet water temperature indication [ºC]

-in case of inlet water temperature = 12ºC
8-1. Outlet water temperature indication [ºC]
 -in case of outlet water temperature = 7ºC
(For units with more than one cycle, this is the average
value)
8-2. Individual outlet water temperature indication [ºC]
In 2 cycles, chilled water outlet temp every cycle is

indicated. (no indication in case of 1 cycle)
-in case of outlet water temp of No.1 = 7ºC

-in case of outlet water temp of No.2 = 7ºC
*Unit whose manual set SW is OFF is indicated.
Dot is indicated, which
means that it is check mode