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40069 Zola Predosa (BO) - ITALY
Traces of humidity and slag which could accumulate inside the chilling plant, or smudge which could occur
after a long use of the dryer, could limit the lubrication of the compressor and clog the capillary tube. The
function of the Filter Drier, located before the capillary tubing, is to stop the impurities, so avoiding their
circulation within the system.
It consists of a piece of reduced cross section copper tubing located between the condenser and the
evaporator to form a throttling against the flow of the refrigerating fluid. This throttling creates a pressure
drop, which is a function of the temperature to be reached within the evaporator: the lower the capillary tube
outlet pressure, the lower the evaporation temperature. The length and the diameter of the capillary tubing
are accurately sized with the performance to be reached by the dryer; no maintenance/adjustment
operations are necessary.
The heat exchanger module houses the air-to-air, the air-to-refrigerant heat exchangers and the demister
type condensate separator. The counter flow of compressed air in the air-to-air heat exchanger ensures
maximum heat transfer. The generous cross section of flow channel within the heat exchanger module
leads to low velocities and reduced power requirements. The generous dimensions of the air-to-refrigerant
heat exchanger plus the counter flow gas flow allows full and complete evaporation of the refrigerant
(preventing liquid return to the compressor). The high efficiency condensate separator is located within the
heat exchanger module. No maintenance is required and the coalescing effect results in a high degree of
moisture separation.
This valve injects part of the hot gas (taken from the discharge side of the compressor) in the pipe between
the evaporator and the suction side of the compressor, keeping the evaporation temperature/pressure
constant at approx. +2 ° C. This injection prevents the formation of ice inside the dryer evaporator at every
load condition
ADJUSTMENT
The hot gas by-pass valve is adjusted during the manufacturing
testing phase. As a rule no adjustment is required; anyway if it is
necessary the operation must be carried out by an experienced
refrigeration engineer.
WARNING : the use of ¼" Schrader service valves must be
justified by a real malfunction of the refrigeration system.
Each time a pressure gauge is connected, a part of refrigerant
is exhausted.
Without compressed air flow through the dryer, rotate the adjusting
screw (position A on the drawing) until the following value is
reached:
Hot gas setting (R404A) : temperature 0.5 ° C (+0.5 / -0 ° K)
5.9 FILTER DRIER
5.10 CAPILLARY TUBE
5.11 ALU-DRY MODULE
5.12 HOT GAS BY-PASS VALVE
pressure 5.2 barg (+0.1 / -0 bar)
info@finicompressors.it
RD 185-410
RD 480-810
A
- EN -
A
4 mm
5/32 in.
-
+
8 mm
5/16 in.
-
+
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