Gree CN851W1000, Service Manual

Page: 158 / 233

DC Inverter Multi
VRF Service Manual
153
4� MAIN PARAMETERS AND REFERENCE VALVES FOR DEBUGGING
Reference Value of the Debugging Parameters for the Pdm-NaB Series Modular DC Inverter VRF System
No. Debugging Items Parameter Description Unit Reference Value Remarks
1
System
Parameters
Outdoor
Unit
Outdoor ambient temperature ——
2
Discharge pipe temperature
of inverter compressor
●During the startup and operation
of the compressor, the normal
temperature of the discharge pipe or
the top shell is between 70 ~85
and the normal heating temperature
is between 65 ~75 ,both of which
are at least 10 higher compared
with the saturated temperature of the
corresponding system high pressure.
●On condition that the inverter
compressor runs but the fixed
frequency compressor stops, the shell
top temperature of the fixed frequency
compressor should be a little higher
than that of the ambient which is very
close to that of its discharge pipe.
3
Shell-top pipe temperature
of inverter compressor
4
Discharge pipe temperature of
compressor with fixed frequency 1
5
Shell-top pipe temperature of
compressor with fixed frequency 1
6
Discharge pipe temperature of
compressor with fixed frequency 2
This parameter
is not applicable
to the unit with
the capacity less
than 28.0KW.
7
Shell-top pipe temperature of
compressor with fixed frequency 2
8
Inlet pipe temperature of
the heat exchanger
●Under the cooling mode, the
inlet pipe temperature of the heat
exchanger should be at least 20
higher than that of the outlet pipe.
●Under the heating mode with the
outdoor ambient temperature below
10 , the temperature of the inlet pipe
of the heat exchanger should be 1
higher than that of the outlet pipe; while
if the outdoor ambient temperature
is above, the temperature of the inlet
pipe should be 3 ~10 higher.
9
Outlet pipe temperature
of the heat exchanger
10
Mid pipe temperature of
the heat exchanger
—— NA
11
System high pressure
The temperature under the normal
high pressure should be among 20
~55 . With the change of the ambient
temperature and the system running
capacity, this temperature should be
10 ~40 higher than the ambient
temperature. The higher the ambient
temperature is, the smaller the
temperature difference between them is.
12
13 System low pressure
●Under the system low pressure of
the cooling mode, the temperature
should be among -15 ~12 ,with
the max.temperature 15 lower
than the indoor ambient temperature
and min. temperature close to the
outdoor ambient temperature.
●Under the system low pressure of the
heating mode, the temperature should
be -25 ~10 , which is about 9 lower
than outdoor ambient temperature.