10
L-3571 ENGLISH
9.
Confirm that thermostat sensing bulb is mounted in the correct area of the box, and that it is secure.
10. Make sure that the thermostatic expansion valve bulb is mounted correctly and securely and insulated.
11.
Make sure that frequently accessed parts are easily accessible, i.e. TXV, thermostat, quick connects,
condensing unit
.
12. Check the seals on the box lid to make sure that they have good contact to the box top.
S
TARTING
T
HE
S
YSTEM
1.
Turn on the designated circuit breaker on the boat’s electrical panel.
2.
For units with a water-cooled condenser, first open the seacock. If pump is shared with another system, ensure that
pump circuit breaker is on.
3.
Set thermostat to desired temperature.
4.
Watch the sight glass to make sure that refrigerant is flowing.
5.
Confirm that water (if used) is flowing out of overboard discharge (see note below).
6.
Confirm that condenser fan is running (if applicable).
7.
Approximately 5-10 minutes after startup, open the box top to visually confirm frost is forming on wall of box or plate.
8.
After 30 minutes of run time, check the sight glass to make sure the element inside is green (no moisture
contamination).
9.
Watch for a temperature decrease at the corresponding box thermostat.
S
YSTEM
W
ITH
2
OR
3 E
VAPORATORS
AND
1 C
ONDENSING
U
NIT
1.
Check all wiring to confirm that each thermostat brings on the corresponding box and the condensing unit and pump
(optional).
2.
To check pressures and refrigerant charge, if necessary, follow these instructions:
•
Turn on only one box. Make sure that box works correctly. Wait approximately 10 minutes.
•
Turn off the first box, turn on the other one. Wait approximately 10 minutes.
•
Turn all boxes on, and check for frost on box/plate surfaces. If not fully frosted, check subcool.
3.
Follow procedures for “Starting The System” on page 10.
T
HERMOSTAT
O
PERATION
For operational reference, see Figure 5: Digital Thermostat (Dometic Control), page 16. For error codes, see Table 6:
Thermostat Display Error Messages (digital Dometic control), page 15.
O
PERATING
THE
D
OMETIC
C
ONTROL
Powering On The System
1.
When the control is powered up (breaker on), the Dometic control display will light up showing all the icons and 888.
That is followed by a display of r5.2 then - - -.
2.
After - - - displays, depending on the mode it was in when it was last powered OFF, the display could flash between
OFF and the box temperature, or start the cooling process by flashing the compressor delay icon
for approximately
3 minutes, then the compressor will start and cooling will begin.
3.
If the KRA unit was in the OFF mode, the control display alternates between OFF and the temperature reading. To turn
on the compressor, press and hold the upper right power button
for 2-3 seconds.
4.
The control display will change from OFF and alternating temperature display to a constant temperature display. If the
temperature setpoint is lower than the box temperature now displayed, the compressor icon
will flash indicating a
call for cooling, and there will be a 3-minute delay before starting the compressor. If compressor icon is on but not
NOTE
The seawater pump will cycle automatically whenever the compressor is running. Regularly check for seawater flow
by observing the overboard discharge when the system is first turned on. If you do not observe steady water flow, turn
off the system and check for obstructions in the seawater cooling system.
