37
Maintenance of main waterway parts.
1. Water supply device: check whether the water supply pressure is more than 2kg and the check valve is stuck
2. Filter device: check whether the filter is dirty and blocked, and clean it regularly
3. Exhaust device: check whether it can exhaust normally. If it cannot exhaust normally, remove and clean the
inside of filter.
4. Water pump device: check whether it runs smoothly, whether the rotation direction is correct.
5.Descaling for DHW, the closed water pipeline is no need of descaling.
6.To supplement pipes must add Y-filter to prevent blocks of condenser or pipeline; Descaling material can be
formic acid, citric acid, and acetic acid, etc. acid or fluoride sanitizers can't be used, because they will corrode
waterside heat exchanger ( material is stainless steel)
Refill refrigerant
Whether need to refill the refrigerant depend on the value of exhaust/suction pressure. The air-tight test should
be done. In case of leakage or replacements of the components of the circulate system,in accordance with the
following two situations to refill the refrigerant.
1. The refrigerant leak completely
If this happens, you must use 40Kgf/cm2r high-pressure nitrogen or a small amount of refrigerant to do leak
detection. Before repair welding, the gas in the system must be drained. Before refill the refrigerant, the system
must be thoroughly dried and vacuum.
a
、
Connecting the vacuuming pipe to the refrigerant injection needle valve of the low-pressure side. Use a
vacuum pump to evacuate the system for more than 15 minutes. Then confirm if the vacuum gauge shows at
－
1.0×105Pa
（－
76cmHg
）
.
b
、
After achieving the required vacuum effect, filling the refrigerant to the system with a refrigerant bottle. On
the nameplate and main technical parameters, we have marked the suitable refrigerant. Make sure to fill the
refrigerant at the low-pressure side of the system.
c
、
The refilling refrigerant quantity subject to the ambient temperature. If you do not meet the required filling
quantity and cannot filling longer, you can turn on the machine, then starting filling continuously from the
low-pressure side, in the meantime must prevent damage from the liquid refrigerant.
2. Refill the Refrigerant
Connecting the refrigerant bottle at the refrigerant injection needle valve of the low-pressure side and
connecting the pressure gauge at the low-pressure side. Then turn on the machine, filling the refrigerant into
the system slowly, and inspect the high and low pressure.
▲Warning: When doing leakage hunting and air-tight test, only high-pressure nitrogen and refrigerant is
allowed to use. Filling oxygen, acetylene, or other flammable or toxic gases is strictly forbidden.
Summary of Contents for NL-BKDX100-400II/R
Page 1: ...1...
Page 7: ...7 NL BKDX50 200II R NL BKDX60 220II R NL BKDX50 200II R32...
Page 8: ...8 NL BKDX80 300II R NL BKDX100 400II R...
Page 18: ...18 7 Connection diagram...
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