DOCUMENTATION OF AUTOMATIC CONTROL
FOR COMPACT UNITS
DTR.MCKT-HPX.
AUT-009.5.0
PAGE
GDYNIA
MCKT-HPX
2016
3/35
KLIMOR Spółka z ograniczon
ą
odpowiedzialno
ś
ci
ą
, 81-035 Gdynia, ul. B. Krzywoustego 5
Fax: (+48 58) 783-98-88; Tel.: (+48 58) 783-99-99
Service – Fax: (+48 58) 783-98-88; Tel.: (+48 58) 783-99-50/51 Mobile: (+48) 510 098 081
Information provided in this document is subject to change
email:
– Office
– Service
1.
INTRODUCTION
1.1
Description of Control System
The control system is specifically designed for MCKT-HPX AHUs. The control algorithm, making use of up to 5
temperature sensors in total, enables highly efficient heat recovery from the air extracted from rooms. Application of
EC motors in MCKT-HPX 1 and MCKT-HPX 2 as well as AC motors controlled with inverters in MCKT-HPX3 also
enables stepless adjustment of fan RPM in entire control range.
The control system supports the heat pump as well as option’s air dampers and preliminary electric heater.
The room panel equipped with 4-line display, enables communication between a user and the control system
installed in the MCKT-HPX. A panel equipped with temperature sensor can be located in any room, which facilitates
operation and improves the comfort of usage.
The application of the MODBUS RTU protocol enables connecting the controller to the facility’s BMS system and
remote control and adjustment of the AHU.
1.2
Functions of control system
The control system is in charge of the following functions:
• Power supply: 1×230VAC – MCKT-HPX 1 i 3×400V MCKT-HPX 2 i MCKT-HPX 3
• power supply, protection and independent control of fan motors, heat pump compressor
• 24VAC power supply of optional air damper actuators
• power supply of control panel
• 2× communication ports RS 485
• 3x analog outputs 0-10V
• 5x non-voltage relay digital outputs, switched
• 5x digital temperature sensor inputs
• 4x non-voltage digital inputs
• 2x analog inputs 0-10V
• 2x quick transistorized output (PWM)
• weekly calendar with possible 4 time zones for each day
1.3
Electric protection
The control system has to be energized in accordance with the wiring diagram and has to be protected with a circuit
breaker with an appropriate rating for the receivers used.
Protection of fans, heat pump compressor and compressor casing heater depend on their output and are provided on
appropriate wiring diagrams.
1.4
Communication
The automatic control system enables communication with the BMS system using the MODBUS RTU –RS485
protocol.
Summary of variables in point 9.
2.
SUPPORTED DEVICES
2.1
Fans
The control system enables independent control using 0÷10V voltage signals of air supply and air exhaust fans
equipped with 1-phase EC motors for MCKT-HPX 1 i MCKT-HPX 2 and 3-phase (3x230V) AC with inverters for
MCKT-HPX 3 size. It also enables providing power supply and protecting each of them individually.
2.1.1 RPM adjustment of MCKT-HPX 1 and MCKT-HPX 2 fan motors
The controller provides a 0÷10V signal directly to the EC motor
2.1.2 RPM adjustment of MCKT-HPX 3 fan motors
The controller provides the 0÷10V signal to the inverter which in a proportional way changes frequency of the fan
motor current.
AHUs are equipped with inverters with 1×230V 50Hz power supply, which control fan motors powered with 3x230V
50Hz. Each inverter is equipped with control panel shown below.
