2920 1351 01
17
Instruction book
5 SETTINGS
The regulating and safety devices are factory-adjusted to obtain
optimum performance of the dryer. Altering the setting of any
of the devices must be avoided.
5.1 Automatic expansion valve
The automatic expansion valve (7-Fig. 4b and 9-Fig. 5b) is a
regulator which keeps the evaporator pressure, and
consequently also the temperature, stable. The valve is factory-
set to keep the evaporator pressure at no-load at a minimum of
5.2 bar(e) (75 psig), which corresponds to 1°C (34°F).
5.2 Switches (Figs. 4b and 5b)
Fan control switch (S3) and high pressure shut-down switch
(S2) are factory-adjusted and must be replaced if they deviate.
Cut-out at: Switch-on at:
bar(e) psig bar(e) psig
Fan control switch
- 50 Hz . . . . . . . . . . . . . . . 17 247 18 261
- 60 Hz . . . . . . . . . . . . . . . 18 261 19 276
High pressure shut-down
switch . . . . . . . . . . . . . . . . 29 421 25.6 371
M1. Refrigerant compressor/motor
1. Liquid refrigerant receiver
2. Liquid refrigerant dryer/filter
3. Condensate trap
4. Refrigerant shut-off valve
5. Flow regulating valve
6. Liquid separator
7. Condenser
Fig. 11. Front view of FD380 W
1. Key, value up
2. Key, value down
3. Display
4. Key, differential value (dT)
5. Key, set point of maximum pressure dewpoint
Fig. 12. Detail of pressure dewpoint indicator
F6843
6
2
4
1
3
M1
5
7
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