MCAC-VTSM-2016-04
R410A DC Inverter VRF V4 Plus W Series 50Hz
Specification & Performance 19
Remark:
TSC1:
water outlet temp. of upper pipe
TSC2:
water outlet temp. of lower pipe
TSJ:
water inlet temp. of double-pipe heat exchanger
T5:
inverter module temp.
Pc:
discharge pressure
Ps:
suction pressure
T7:
discharge temp. of inverter compressor
Each model has one inverter compressor and two EXVs at the high-pressure pipe side.
Key Components:
Oil Separator:
used to separate oil from high pressure & temperature gas refrigerant, which is pumped out
from compressor. The separation efficiency is up to 99%, it makes the oil return back to each compressor very
soon.
Low pressure receiver:
It is used to store the liquid refrigerant and oil, it can protect the compressor from
liquid hammer.
Four-way valve control (ST1):
Closed in cooling mode and open in heating mode
EXV (electronic expansion valve) control:
1) Max. Open degree is 700 pulses.
2) When system power on, the EXV closes 700pulse first, then opens to 350 pulse and stand by. When then
the unit started, it opens to the right pulse.
3) When the running main unit receives OFF signal, the EXV of slave unit will stop, while master unit is running
and slave unit stopped at the same time. If all main units stopped, the EXV will close first, and then open to the
pulse of stand-by.
SV2: spray a little liquid refrigerant to cooling compressor. Open when any compressor discharge temperature
is higher than 100
℃
.
SV3: open when power on, closed after 60 seconds; open when discharge pressure is less than1.8MP in
cooling mode, open when discharge pressure is greater than 4.0MPa in heating mode.
SV4: oil returning valve. Opens after the DC inverter compressor has been run for 5 minutes and then closes
15 minutes later. (For the system has only one main unit).
Every 20 minutes, SV4 of each main unit opens for 3 minutes. (For the system has more than one main unit)
High pressure sensor: To supervisor the discharge pressure of the compressor and to control the water
temperature.