Hitachi RASM-2VRE Installation And Setup page 13

Once you confirm the heat pump works correctly in heating mode then it is time to check the
operation in Tank mode.
Use the left and right arrows to highlight the DHW segment of the display then turn the heat
pump on using the ON/OFF switch
Assuming the tank is starting from cold then the heat pump should start fairly soon. If you are not starting from
cold then check the tank is not too warm (from, say, prior immersion heater operation) for the heat pump to
start. You may have to let a lot of water out of the cylinder if this is the case. Eventually the pump and compres-
sor logos will come on. This may take some minutes. Be patient.
Once the pump logo has come on check the pump water flow using the instructions and table on page 9. If you
are low on water flow then cease testing and investigate. If not carry on.
After the compressor logo has come on then go outside and check that the outdoor fans are working, the com-
pressor is running and there is nothing untoward happening. Check the 3 port valve has opened too.
After twenty minutes to half an hour use the MENU key to go into the main menu, select OPERATION INFORMA-
TION and GENERAL. This will show you the flow and return temperature. Check that the flow temperature is
higher than the return by around 4 to 6C. Take note of these temperatures as well as the Water Setting and
Outdoor Ambient temperatures.
Now go back to OPERATION INFORMATION and select DHW. Note down the various readings.
Now go back to OPERATION INFORMATION and select HEAT PUMP DETAILS. Check the water flow rate is still
correct and note down the other operating conditions as below
• Water Inlet and Outlet
• Water Outlet PHEX
• Water Flow rate and pump speed
• Outdoor Ambient Temperature
• R410a temperatures and pressures
• Expansion Valve %
• Inverter Operating Frequency
• Compressor Current
Please note that if you have used the setup settings in this book then the immersion heater will be used, after
20 minutes, to assist the heat pump. Check that this is working correctly.
Once you have taken note of everything and can confirm that everything is working fine in hot water mode then
use the ON/OFF switch to turn the heat pump off again so the green light goes out.
T: 0191 516 6554
System Test—Tank Mode
W: www.seconrenewable.com
Select me using the arrow keys
Press Me
I should turn green
If I turn red then there is a problem!
Key points to take care of
Have I got good water flow?
Am I getting 4 to 6C temp diff?
Is the water getting hot and going to the
cylinder not buffer tank
Does everything sound and feel right?
E: info@seconrenewables.com