Ddc Controls • Operation; Programming The Ddc - Dometic DDC Operation Manual

DDC Controls • Operation
When the circuit breaker is turned on the unit will display
the revision code for two (2) seconds. The display will the
go blank for one (1) second and remain blank if the mode
switch is off.
During normal operation the display alternates between the
water in and water out temperature readings. The supply
water temperature is displayed followed by the return water
temperature:
rtr = return water temperature (water in):
RETURN jack on PCB
SUP = supply water temperature (water out):
FREEZE jack on PCB or HILIM jack (when
equipped with electric heater)
The unit will cool when the mode switch is in cool and the
return water temperature is 2°F (1.1°C) more than the cool
set point.
The unit will heat when the mode switch is in heating and
the return water temperature is 2°F (1.1°C) lower than the
heat set point.
The chillwater pump operates continuously when the unit in
the heat or cool mode.
The seawater pump turns on 10 seconds before the
compressor starts and turns off 10 seconds after the
compressor cycle is completed. However, the seawater
pump can be programmed to run continuously.
The reversing valve is toggled to relieve head pressure if
the previous cycle ended within 75 seconds of a new cycle
(unless the system is configured with an electric heater).
No cycle will be started if any fault is detected.
L-2281 Operation

Programming the DDC

To program the DDC press the SELECT button to show
program item from the following list then press and hold the
SET button until the desired setting is displayed.
CSP - cool setpoint
HSP - heat setpoint
dl - staging delay
°F or °C - Fahrenheit/Celsius selection
rc or EH - reverse cycle or electric heat
clc or con - cycled or continuous seawater pump operation
LPE or LPd - Low Freon pressure detection enabled or
disabled
AC - AC line voltage monitor (read only)
Reset the factory default programming pressing the
SELECT button followed by pressing the SELECT and SET
buttons simultaneously.
Parameter
Description
mneumonic
CSP Cooling Set Point
HSP Heating Set Point
dl
Staging Delay
F
Fahrenheit/Celsius
° or °C
selection
rc or EH Reverse Cycle or
Electric Heat
dc or con
Cycled or
Continuous
seawater pump
operation
LPE or LPd
Low Freon
pressure detection
enable or disable
AC
AC Line Voltage
Monitor
7
Default Range
48°F 40°F - 58°F
110°F 95°F - 120°F
15sec 10sec – 200sec
°F °F or °C
rc rc or EH
clc clc or con
LPE LPE or LPd
(AC Line Please refer to
Voltage detailed section
Reading) on AC Line
Voltage Monitor.
v
English