Hitachi RPI-0.8FSG1 Service Manual page 139

b. Heating Operation (It is applicable when outdoor temperature is higher than 0°C.)
No. Check Item
1 Is oE1 (O.U. Ex. Valves Opening) abnormally
low or high when Td - SH is 15 to 30 deg.?
2 Is Pd "1.6" to "2.2"?
(Pd is high when the indoor temperature is
high.)
3 Is H1 (Compressor Frequency) +
(CC (Numbers of Running Compressor) - 1)
x (/) abnormally low or high? (The lower is
the room temp. and outdoor temp., the higher
is the above value.)
4 Is Pd "0.2" to "0.5"?
(Only under the condition that electrical
expansion valve SVA is OFF.)
5 Is the temperature difference between I.U.*
more than 15 deg. when iE (I.U. Ex. Valve)
is 100?
* The temperature difference between I.U.
means the following;
b3 (Discharge Gas Temp.) - b2 (Intake Air
Temp.) indicated on the remote control
switch by check mode. However, this is
applicable only when b2 (Intake Air Temp.)
- b1 (Setting Temp.) is higher than 3 deg.
NOTES:
1. The symbol with an underline
2. Regarding (✴), the following value should be applied.
Power Supply
380-415V/50Hz
380V/60Hz
220V/60Hz
oE1 = 30 to 70%
indicates checking item and the mark "
Mark (/)
8HP 10HP
50 62
60 75
Standard Causes
* Low: Insufficient
Refrigerant
* High: Excessive
Refrigerant
- * Low: Solenoid
Valve SVA Leakage
* High: Excessive
Gas Pipe Resistance
- * Low: Excessive
Refrigerant
* High: Insufficient
Refrigerant,
Excessive Pipe
Resistance
- * Low: O.U.
Short-circuit
* Low/High: O.U. Fan
Thyristor Failure or
Outdoor Air Sensor;
Failure
- * Failure such as
P.C.B., Wiring,
Coil, Valve
* Excessive Pipe
Resistance
* Thermistor Failure
for Discharge Air
" indicates checking data.
16, 20HP
70
84
TROUBLESHOOTING
Result
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