Normal Operation Pressure - Hitachi RAS-(3-6)HVRNM2E Service Manual

7 Test Run
21 Does the drain water flow smoothly from the drain pipe? __________

Normal operation pressure

You can check the excess or the deficiency 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
Discharge pressure Pd (MPa)
Outdoor unit temp. (DB ºC)
Indoor unit inlet temp. (WBºC)
Suction pressure Ps (MPa)
Outdoor unit temp. (DB ºC)
Indoor 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.
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SMGB0064 rev.0 - 08/2011
( * )
Heating operation
Discharge pressure Pd (MPa)
Indoor unit temp. (DB ºC)
Outdoor unit inlet temp. (WBºC)
Suction pressure Ps (MPa)
Indoor unit temp. (DB ºC)
Outdoor unit inlet temp. (WBºC)