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Rev. 3 02-2021
79
MTEC.DXi.H/DXi.HF.GB-3 Use and Maintenance technical manual DXi.H/DXi.HF English
Emibyte DXi.H/DXi.HF
Direct expansion close control
5. Room humidity too low (low humidity
alarm signal)
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b. The humidity set-point is set at too low
value
Increase the humidity set-point value
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fans alarm signal)
a. The fans are not powered
Check the fans electric circuit
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c. Obstruction presence in the air duct or
pressure drop to high
Check the total pressure drop and compare
it with the unit available pressure
d. The fan thermal protection is active
Check the fans winding resistance (after
reset, check the voltage ancd the electrical
absorption)
7. The 3-way valve doesn’t work (present in
case of BC / BG option installed)
a. The control system doesn’t work
Refer to the attache Controller Manual
b. The valve servomotor doesn’t work
Check the electrical connections and even-
tually replace the servomotor, if defective
c. The valve is locked mechanically
Try to unlock manually the valve or replace
it
8. High pressure switch is enabled
a. The system of condensation pressure
control is doesn’t work properly (if present)
Check the condensing control system is
properly set and is working
b. One or more condensing fans are not
working
Check the intervention of thermal protec-
tion fan/s, if necessary replace the fan/s
devective
c. High pressure switch is not properly set
Replace the high pressure switch
d. Discharge pressure too high
Refer to point 14
9. Low pressure switch is enabled
a. Low pressure switch is not properly set
Replace the low pressure switch
b. Suction pressure too low
Refer to point 13
10. The compressor doesn’t work
a. Automatic switch intervention
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-
re la pausa del cortocircuito
b. Compressor internal protection interven-
tion
Check the compressor winding resistance
(after reset, check the voltage and electrical
absorption)
Check the operational parameters return to
the nominal values
c. The contactor doesn’t work
Check the contacts and the contactor coil
11. The compressori s noisy
a. Liquid return to the compressor
Check the operating and the overheating of
the expansion valve
b. Compressori s damaged
Replace the compressor
12. Compressor high suction pressure
a. Thermal load higher than estimated
Check the room thermal load value