Hitachi RAS-(4-12)HRNM(2)(E) - Normal Operation Pressure

7 Test Run
182
SMGB0064 rev.0 - 08/2011
21 Does the drain water ow smoothly from the drain pipe? __________
Normal operation pressure
You can check the excess or the deciency of the refrigerant in comparision with the following charts and actual pressure
measurement.
The following checking procedure is useful during test run and maintenance work.
RAS-(3-6)H(V)RNM2E
Cooling operation Heating operation
Discharge pressure Pd (MPa)
Discharge pressure (MPa)
Outdoor unit temp. (DB ºC)
Indoor unit inlet temp. (WBºC)
(
*
)
Discharge pressure Pd (MPa)
Discharge pressure (MPa)
Indoor unit temp. (DB ºC)
Outdoor unit inlet temp. (WBºC)
Suction pressure Ps (MPa)
Suction pressure (MPa)
Outdoor unit temp. (DB ºC)
Indoor unit inlet temp. (WBºC)
Suction pressure Ps (MPa)
Suction pressure (MPa)
Indoor unit temp. (DB ºC)
Outdoor unit inlet temp. (WBºC)
N O T E
• (*) When ambient temperature is less than 30 ºC, outdoor fan volume decrease.
• The above curves indicate pressures under the following conditions:
- Indoor fan speed: HIGH
- Indoor total capacity: 100% compared with the capacity of the outdoor unit. (Connected 4 indoor units.)
- Piping length: 7.5 m (main piping: 5m, branch piping: 2.5 m x 4)
• Do not use the above data for the refrigerant charge procedure.
- These data should be used as a reference for the checking of operating conditions.