Fisher FHIF-WHS-120CE3, Руководство по обслуживанию

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R32 ATW Service Manual
38
Attention
In order to prevent oxidation inside the copper tube during copper pipe welding, nitrogen filling must be taken.
Otherwise the scale will block the refrigeration system!
11.3.2 Connection between outdoor unit and hydronic module
Note: The refrigerant circuit of the hydraulic module contains a small amount of Nitrogen, which is used to keep
the pressure and detect leakage. When installing, unscrew the nut of the refrigerant pipe joint of the hydraulic
module. If there is no gas flowing out, check the refrigerant circuit of the unit for leakage. Install and operate only
after confirming no leakage.
11.3.3 Accessory pipe in pipeline
Because of different mounting positions of the air conditioning, the required accessory pipe can be long or short,
to avoid affecting the capacity from too long cooling pipe, please select a reasonable tube length according to table
below, try to select the location of the shorter lines for the installation.
(1) The maximum allowable operating distance away from the pipe.
<6.5kW 6.5~10.5kW
≥
10.5kW
Pipe length Max. length 15m Max. length 20m Max. length 50m
Height difference Max. height 8m Max. height 10m Max. height 20m
Oil return bends quantity Up to 10 Up to 10 Up to 15
Note: On condition that 80% of the cooling capacity is guaranteed in the above parameters, the cooling capacity
loss and return oil has been fully considered .
(2) The use of oil return bend.
When the height difference between the indoor and outdoor unit is greater than 5 m, in order to facilitate oil
return of the compressor, oil return bend must be used. Upon site operations, the following typical installation
methods can be referred to.