Aircommand IBIS ROOFTOP CARAVAN Manual - page 8
Page 7
Recharging in the field:
If the unit has the following deficiencies in cooling mode:
Assuming outside temp. is close to 35C and inside 27C
1: The difference in temp. between the inside return air and the
discharge air is less than 14C. (inside fan on Hi )
2: The inside coil temp (as measured with thermistor (see pp 1&2)
is more than 14C
3: The suction pressure (measured at access valve see figs 12) is less than 400 Kpa, then
it is indicative of a lack of refrigerant charge.
Firstly examine the hermetic system for possible leaks. Check both access valves with an
electronic detector.
If any access valves are suspect, then renew the caps with models incorporating a seal. See fig
12d.
Any leak found in solder joints etc. will require the unit to have any remaining refrigerant
recovered, the leak repaired and checked and the unit evacuated and recharged. (720 grams)
A unit that may have had a leak at an access valve and this has been rectified, can have
refrigerant added. Add refrigerant until a good fit is made with the above parameters. I.e. Suction
pressure above 400 Kpa, delta T greater than 14C and the inside coil below 14C.
The use of Independent generators or Inverters:
Failure to start the Aircon:
1: Check that the Generator or Inverter is rated at 2.8 KW or
greater.
2: Check that no other accessories are making a demand on the
power load.
To check on possible hidden loads, directly wire the aircon.
to the genset. If unit starts OK then advise the client to identify and isolate the extra
electrical load.
The display panel has an unusual display of numerals. Unit is however OK
On mains power:
1: This is a sign of a poor waveform being generated.
Advise client to have generator repaired or replaced with
A better quality unit.