ULT Energy-saving Series
After-sales Service Manual
31
refrigerant R290 first followed by refrigerant R170, and this is because the pressure of refrigerant R170 is higher.
The filling capacity shout conform to the attached table!
3) After filling, seal the process pipe for filling, and the sealing effect is as shown in Figure 6
[Precautions]
*The filling capacity for low temperature stage system should be accurate, and minor difference may affect
refrigerating effect.
*The pressure of refrigerant R170 is high and there is relatively less refrigerant in the steel cylinder. The
cylinder valve should be opened slowly for filling to avoid the waste of refrigerant.
*The pressure of refrigerant R170 is too high, and the general steel cylinder can not bear too high pressure.
Therefore, oxygen cylinder is used to fill refrigerant R170, the lower outlet of the steel cylinder must be blocked
with screws to prevent refrigerant leakage, and the upper outlet is used for filling. When filling above refrigerant, the
steel cylinder can be filled vertically and filled with gas.
*In order to ensure the accuracy of refrigerant filling, all refrigerant must be weighed with electronic scale
when filling.
*If vacuum pumping and refrigerant filling are not carried out in accordance with the above requirements and
operation procedures, resulting in poor or non-refrigeration of the freezer, and freezer return or exchange, once
verified by the headquarters, the claim of double maintenance cost of the freezer shall be made, and cost of freezer
return or exchange shall be paid by the business outlet.
*The quantity precision (gram degree) of refrigerant filling in the system of ULT Freezer is very strict, and a
standard electronic scale with an error of 2 g must be prepared in the outlet before maintenance.
Refrigerant filling capacity of products
Model
Refrigerant (type/capacity) 1
Refrigerant (type/capacity) 2
High temperature stage (g)
Low temperature stage (g)
R290
R290
R170
DW-86L338J
150
5
65
DW-86L388J
150
5
65
DW-86L490J
150
5
90
DW-86L578J
150
5
90
DW-86L626
150
0
100
DW-86L728J
150
5
90
Figure 5
Figure 6
