Hitachi RWH-4.0VNFE User Manual

7.2.4 Checking the refrigerant circuit
• Check to ensure that the stop valves on the gas and liquid
lines are fully open.
• Check that the size of the piping and the refrigerant charge
comply with the applicable recommendations.
• Check the inside of the unit for refrigerant leakage. If there is
a refrigerant leak, call your dealer.
• Check outdoor unit commissioning procedure manual.
7.3 COMMISSIONING PROCEDURE
This procedure is valid regardless of what options are on the
module.
• When installation is complete and all necessary settings
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have been carried out, close the electrical box and place the
cabinet as shown in the manual.
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• Make a test run as shown in item
“7.4 Test run / air purge”.
• After test run is completed, start the entire unit or the
selected circuit by pressing the OK button.
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Initial start-up at low outdoor ambient
temperatures
During commissioning and when water temperature is very
low, it is important for the water to be heated gradually.
Additional optional function can be used for starting at low water
temperature conditions: Screed drying function:
• The screed function is used exclusively for the process of
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The process is based on EN-1264 par 4.
• When user activates screed function, the water set point
follows a predetermined schedule:
1 Water set point is kept constant at 25ºC for 3 days
2 Water set-point is set to the maximum Heating supply
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 C A U T I O N
Heating at lower water temperatures (approximately 10ºC to 15ºC) and
lower outdoor ambient temperatures (<10ºC) can damage the heat pump
when defrosting.
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OFF in order to circulate water by water pump and remove possible air
into the unit.
7.4 TEST RUN / AIR PURGE
Test run is a working mode used when commissioning the
installation. Some settings are made to let the installer an easy
job. Air purge function drives the pump in a way for evacuating
air bubbles in the installation.
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pressing the menu+back buttons for 3 seconds at the installer
menu (OK+back buttons).
OK
This menu shows the following test to be launched:
• Unit Test Run
• Air Purge
• Screed Drying
COMMISSIONING
PMML0340B rev.1 - 03/201630

Hitachi RWH-4.0VNFE Specifications

General

Brand	Hitachi
Model	RWH-4.0VNFE
Category	Heat Pump
Language	English