Hi All,
How can we compensate for the extra charge that we need in cooling mode, for the heating mode?
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Hi All,
How can we compensate for the extra charge that we need in cooling mode, for the heating mode?
Hi jwasir
I had a unit last month with a similar problem - it is water cooled so I reduced the water flow rate so as the load was reduced which worked. If it is air cooled/heated the outdoor fan could be slowed or airflow reduced with a damper.
I have same question and want to know the answer.
Why do you need to compensate and why you think you need to compensate for this?
Charge is the same in cooling and heating mode because mass flow is the same under standard conditions. Excess due to deviating load, ambient, indoor, fan speed...is stored in receiver and condenser.
Hi Peter the unit I mentioned above was a Climatemaster floor mounted unit which probably had too much water flow rate to start with. But in the last week I had been working on a Diamond unit where the outdoor unit fans have been disabled due to tripping on HP in heat mode. The unit was sized for mainly cooling, full fresh air Sydney conditions. The primary heat is EDHs and it uses Copland scrolls which I am told can handle a little flood back. This would be (in my opinion) caused by a much larger outdoor coil than the indoor coil. I think with this system the fans could/should run at a reduced speed on the outdoor unit during heat mode. This would limit flood back and excessive high pressures.
Hi Peter_1,
Tesla is correct! The problem is not so much in water cooled system as condenser is not that big. But in Air to Air systems, condenser (cooling mode) needs to be bigger, when this becomes evap in heating mode the charge requirement is much less as compare to what has been used in cooling mode.
I need to know what others do to compensate this extra charge??
Then a liquid receiver is the solution
The problem with receivers is a longer dip tube only on one side. It will work in any one mode but in reverse cycle, only vapors will go to evap.
Any other ideas!!
A receiver with 2 dip tubes of course like this one
General view, 2 'normal' OEM receivers and one for the reevrsible heatpump
Do U think an Accumulator will work??
nice but shouldnt a reciever have a fusible plug/safety blow off and be stamped with volume and max pressure.otherwise 2.4mtr of pipe to weigh in.Quote:
Originally Posted by Peter_1