1.2 Operating instructions µC2
DESCRIPTION OF THE CONTROL UNIT
This is a multipurpose controller specially programmed for use with air-water cooling units and heat
pumps equipped with a compressor with one single power stage.
Main functions
• Water temperature control (at inlet or outlet, As per parameter r6).
• Defrost cycle management.
• System operating and safety management.
• Fan speed control.
• Alarm management.
• Connection for supervision and remote assistance (serial connection accessory RS485).
Devices controlled
• Compressor
• Fans
• Four-way valve
• Water pump
• Alarm device
• Auxiliary heater
STANDARD COMPONENTS
Control module
This is the central nucleus that processes the signals coming from the probes and protection elements
of the entire system to control its active elements: compressor and fans, four-way valve, water circulating
pump, alarm relay and auxiliary heater. Power supply 24 Vac.
It can also be used for access and control of the system by means of the display, buttons and LEDs
available. It allows for selection of cool, heat and off functions. Operating parameters can also be modi‐
fied, and the system can also be supervised.
Fan speed control module
Operates by phase cut-off. Includes fuse
NTC and ratiometric (pressure) probes
YLCA / YLHA PLUS 5 to 15 standard
4 NTC probes are used to read the temperatures of the system:
• B1. Controls the set point. Reads water temperature at exchanger inlet.
• B2. Antifreeze control. Reads water temperature at exchanger outlet.
• B3. Controls the dynamic set point. Reads outdoor air temperature.
• B4. Fan speed and defrost cycle control. Reads coolant pressure inside the battery.
YLHA PLUS, YLCA 20, 27 and YLCA 5 to 15 LAK (Low ambient Kit accessory)
3 NTC probes are used to read system temperatures and a ratiometric pressure transducer (B4) to read
coolant pressure inside the coil:
• B1. Controls the set point. Reads water temperature at exchanger inlet.
• B2. Antifreeze control. Reads water temperature at exchanger outlet.
• B3. Controls the dynamic set point. Reads outdoor air temperature.
• B4. Fan speed and defrost cycle control. Reads coolant pressure inside the coil.
Parameters
The set of parameters that configure the operating program of the unit is divided into four levels (Factory,
Super User, User and Direct), depending on the function of each parameter and the user’s access level.
The parameters of each level can be modified from that same level, as well as lower level parameters.
User manual
1
Operating instructions µC2 1.2
7
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