Hanbell RC2-930A - Page 56

Technical Manual VERSION 2.0 -10-18-2018
56
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p. Oil flow switch
Oil flow switch operates with external oil separator to prevent oil deficient compressor. Specification and installation
of oil flow switch are shown as below:
G Type
PN
bar
Qmax. Recom.
l/min
switch value l/min
selectable range for
fixed switch
L
mm
H
mm
SW
mm
X
mm
Weight kg
bronze
G 1/2 FF015GR012 200 20 0.412 68 79 29 13 0.6
G 3/4 FF020GR025 25 40 0.625 73 79 32 11 0.7
G 1 FF025GR040 25 60 1.540 87 90 41 14 1
Figure 45 Outline of oil flow switch
q. Economizer connection muffler
When economizer is used, it is recommended to install a muffler and check valve before middlepressure returned
gas port in compression chamber to effectively mitigate pulsation noise in middle pressure as shown in the drawing
below:
Figure 47 Installation of ECO muffler
r. Mounting pad
To avoid extra vibration and noise resulted from direct contact between compressor footings and the base on which
compressor is mounted, it is recommended to add mounting pads in between as the drawing below shown.
From compressor
discharge port
To compressor
oil return port
Figure 46 Installation of oil flow switch
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(1)Tolerance: ±0.3l/min
(2)Media temperature: max 110 ℃
(3)Average pressure loss: 0.4 bar at Qmax
(4)Hysteresis:depending on switch value minimum 0.4 l/min
Note: Switch value is indicated for horizontally decreasing flow