19
03.17 207529 Rev.100
CSTIA/CCHIA
– CSTIBA/CCHIBA
SPLIT HORITZONTAL INVERTER UNITS
AUTONOMOUS AIR-AIR
If symptoms of refrigerant loss appear d
uring operation, it’s necessary to carry out a leak test. Leak detectors usually
employed with CFC and HCFC cannot be used with R410a, due to chlorine in its composition. A leak detector for
R134A can be used but the sensitibity will be lower (when sensitibity is 1 for R134A, it falls to 0,6 for R410A).
To find small leaks, you will need a detector for HCF. Sensitibity for R410A is approx. 23 grams per year.
If a gas leak is found, it will be necessary to remove and completely recover the refrigerant charge. Pressurize the
system with dry nitrogen. If no leakage is detected, then do the vacuum and charge again with refrigerant.
MAINTENANCE
It is advisable to do maintenance works every 1.000 operating hours as well as at the beginning of each cooling season.
•
Coils:
At least once a year, clean condenser coils with water and detergent, then dry with air at a low pressure. Never
clean with wire brush.
•
Fans and motors:
Adjust transmission belt at least twice during the first month of operation and then check every 1.000
hours. Fan and motors do not need additional lubrication.
•
Drainage system:
Verify condition and good operation of the drainage tray and siphon.
•
Refrigeration circuit:
Check for oil refrigerant leaks, n
oises or system’s vibrations. Take measurements of temperatures
and pressures of components and record them on the maintenance form.
•
Electrical circuit:
Make sure that all electrical connections -wires, contactors, and terminals- are properly tight. Record
the measurements (volts and amperes) of each compressor and fan motor. Verify the starting current. Check the good
operation of all relays, presostats and phase sequence relay of Scroll compressor.
•
Air filters
: Clean filters after the first 4 operating hours and then every 3 months (or even before). Wash filters in water
with detergent, rinse thoroughly and let dry.
Before performing any service or maintenance operation, turn off the main power
switch of the system to avoid any personal injuries. Block the power switch so that
nobody other than a qualified technician can switch on electrical power.
