r410 low ref effect

[kefah]

hi every one
i work in thermal power plant
since many years we used r22 ac unit in it
they were sucssful
before amonth
we been supplied by ac unit but with r410
problem is the cooling of these unit was too weak
so we tried many mark of ac
lg.samsung etc
same result
since the temp in iraq reaches 51 c in some days
so where is the problem
in ***** 410
or in the unit or where
can some one advice me

[install monkey]

r410a is twice the operating pressure of r22
discharge pressure is typically 33 bar- at 20deg ambient so at 50 deg ambient, high head pressure and poor performance

[kefah]

thank u for ur reply
as u know the normal suction pressure is 60 psi
but when temp exceed 50 c and reaches about 60 and 70c
pressure is rise to 80 psi
so what u advice me to do

[mikeref]

thank u for ur reply
as u know the normal suction pressure is 60 psi
but when temp exceed 50 c and reaches about 60 and 70c
pressure is rise to 80 psi
so what u advice me to do
There must be something in the paperwork you received with a/c units to say what minimum and maximum ambients they cannot work at.
I would say any ambient over 40 C is going to be putting a huge strain on a R410 systems.

[install monkey]

thank u for ur reply
as u know the normal suction pressure is 60 psi
but when temp exceed 50 c and reaches about 60 and 70c
pressure is rise to 80 psi
so what u advice me to do
In the uk typically 10-12 bar standing pressure and a suction pressure of 10 bar at start up dropping to 8bar when the inverter is ramped up. Discharge pressures can go upto 38bar, this is based on a 20deg ambient ,my only recommendation is to go for 407c systems

[Yuri B.]

They are too weak for the present load. Check their specifications for the efficency at such ambient temperature. In all, if the choice of the units was based on a claimed efficiency ratio, then the mistake is now tangible.

[Yuri B.]

They are too weak for the present load. Check their specifications for the efficency at such ambient temperature.  In all, if the choice of the units was based on a claimed efficiency ratio, then the mistake is now tangible.
So, at first check the "papers," as Mikeref said.

[kefah]

thank u for help
please close the thread