Cx(E) Controls - Marstair CX Series Technical Manual

CXE ELECTRONIC COOLING SYSTEM CONTROLS
CAREL IR33 Controller
ON/OFF SWITCH
The switch operates the fan motor and is illuminated when power is supplied to the indoor unit. When switched OFF, the
fan stops, the switch remains illuminated and the crankcase heater in the outdoor unit (if fitted) remains live.
Minimum Set Temperature 8°C
INDOOR UNIT OUTDOOR UNIT
CX(E) 30 CKC 20
CX(E) 40 CKC 30
CX(E) 50 CKC 50
CX(E) 70 CKC 80
CX(E) 90 CKC 90
TEMPERATURE CONTROL (Do not set the controller below 4⁰C.)
The SET temperature is factory set at 12⁰C.
The digital display normally displays the return air temperature.
To change the SET temperature, press and hold down the SET button. If no
alarms active, the 'St1' label appears and the current value is shown on the screen
and will flash.
To change the Setpoint value, press ▲ and ▼ keys within 60 seconds.
The display will revert to the return air temperature after 60 seconds.
The fitted de-ice thermostat will activate a de-ice cycle when there is a build up of ice
on the evaporator coil.
Cellarators will only heat a room if the electric heater option is fitted.
Displaying inputs on screen display
Press ▼ to display the current input. There are 6 inputs to select from to display
onto the screen. These are as follows:
b1: probe 1;
b2: probe 2;
di1: digital input 1;
di2; digital input 2;
St1: set point 1;
St2: set point 2;
Press ▲ and ▼ to select the input to be displayed. Press set for 3
seconds to confirm your choice.
To display the live temperature in the room you need to select
b1: probe 1
WARNING
The following actions could damage your system:
1. Switching the unit OFF and ON quickly
2. Setting the unit to HEAT and then back to COOL quickly
NB: Allow at least 3 minutes between the above actions.
Minimum Set Temperature 4°C
INDOOR UNIT OUTDOOR UNIT
CXE 40 CKC 20
CXE 50 CKC 40
CXE 70 CKC 60
CXE 90 CKC 80
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