2004 SERIES - CHILLER SYSTEMS - OPERATION AND INSTALLATION MANUAL - PAGE : 19
2004 SERIES - CHILLER SYSTEMS - OPERATION AND INSTALLATION MANUAL - PAGE : 19
EDITION DATED 21ST AUGUST 2006
When starting up an air conditioning unit it is
advisable to carry out a certain number of
control routines to ensure proper functioning
of the unit.
- always check (especially after a long
absence) the functioning of the sea water
cooling system. Immediately stop the system
if no sea-water comes out of the pump exit
after compressor starts up.
- periodically check the air filter in the return
air grilles. Clean if necessay.
- check condensation drain from the evapora-
tor drain pan.
- take care not to damage the air-ducts. A
damaged air-duct may stop air flow through
the evaporator, freeze up the evaporator and
subsequently damage the compressor.
- when preparing for winter lay-up take care
to rince all sea-water circuits with a fresh-
water/glycol solution (20% or more depend-
ing on local winter conditions).
10.TROUBLE SHOOTING
1) No sign of live : check main electrical sup-
ply, fuses, etc.
2) The digital display shows 3 lettres
<AAA>. This means a persistent state of low
voltage (less than 195 V AC). The system
will re-start as soon as the voltage level
climbs above cut-out level and the system
will then re-start after a time-delay of 1
minute approx.
3) The compressor will start but no sea-water
circulation can be observed :
- check sea-cock to sea-water pump.
- check sea-water strainer
- check if pump turns
- if the pump does not turn with the com-
pressor working, check power-supply from
the main control unit box to the pump.
4) Compressor and pump work but no correct
operation in either cool or heat cycle :
- during the heat cycle with too slow a sea-
water circulation you may actually freeze up
the sea-water in the cupro-nickel condenser
and completely block the system.
- check voltage level. Do not operate a sys-
tem with a persistent voltage level below
195 V AC.
- check freon charge if operation is still not
satisfactory, after having checked all the
above points.
5) The compressor works but is subject to
intermittent stops without having attained
the desired set-point temperature.
- the HP and BP (if present) pressure safety
switches stop the compressor because of
abnormal working pressures either on the
high or on the low side. Check proper func-
tioning of the cooling circuit. Check ventila-
tor/blower system for obstructions.
- incorrect freon charge (over-charge or
insufficient charge level).
See also here-above :
Error
codes/interrupted system opera-
tion.
6) The heat cycle takes very long to get start-
ed.
- normal if the sea-water temperature is very
low. If sea-water temperature drops below
approx. 8° C. the heat cycle becomes much
less effective and takes long to get properly
started.
7) The heat cycle functions very well but the
compressors stops by means of the high
pressure safety switch.
- the heat cycle functions with a very high
sea-water temperature and therefore the
high pressure side exceeds the safety limit.
You may try to remedy this situation by
slightly restricting the sea-water flow but not
so much as to freeze up the condenser. Do
not forget to open up the sea-water circula-
tion again when switching back to
<COOL>.
