Ventilation unit with heat recuperation
DUOVENT
®
COMPACT RV
2
5
6.
1
ELECTRIC HEATER CONNECTION
The cables of the electric heater are led to the terminal board of the electric heater and properly marked for the subsequent connection of the
control and management system. Type connection of the electric heater terminal block for DUOVENT
®
units:
SC… emergency thermostat with manual reset
SB… operating thermostat with automatic reset
6.
2
INSTRUMENTATION AND CONTROL (I&C) SYSTEM
The standard part of the unit is its own control system. The design of the unit is ready for cooperation with the Digireg
®
digital controller.
6.1
DIGITAL REGULATION SYSTEM DIGIREG
®
The control system is located in a compact sheet steel switchboard equipped with a main switch, digital controller on the PCB board and safety
and switching elements for individual HVAC units. The cables pass through plastic bushings with locking in the left side of the cabinet.
Basic dimensions of Digireg
®
M3-Vx switchboard with protection level IP20:
The switchboards M1-E2 to M3-E36 have dimensions 660 x 660 x 120 mm.
The Digireg
®
switchboard with IP65 protection has dimensions of 640 x 600 x 210 mm.
6.
2
.2 TEMPERATURE REGULATION
The Digireg
®
controller is designed to control the output of the heater or cooler of the air handling unit to reach the desired temperature. The
Digireg
®
can command direct cooling or a heat pump. There is a 3-point output for servo drive of the mixing valve, direct power outputs SSR for
electric heating or two analogue outputs 0
–10 V / 0–20 mA. The heat pump or cooling unit is controlled by potential-free contacts.
–
Regulation to a constant supply air temperature
uses one temperature sensor in the supply pipe, the supply air is heated or cooled to the required set temperature within the minimum and
maximum configured temperature
–
Regulation to a constant temperature of the exhaust air
uses one temperature sensor in the exhaust pipe, the supplied air is heated or cooled to the required set temperature within the minimum
and maximum configured temperature
Spatial temperature control (for constant room temperature)
cascade control is used with limitation of the minimum and maximum supply air temperature. The main sensor is placed in a ventilated area,
the supply air sensor is placed in the outlet of the unit in a place with sufficient air mixing. If the room temperature is higher than the set
value, the controller will try to reduce the supply air temperature to the set minimum supply air temperature. If the room temperature falls
below the set value, the controller tries to compensate for this by increasing the supply air temperature. The room temperature can be
selected as the room temperature, the temperature from the sensor in the controller, or from a separate sensor connected to the
motherboard. The controller cools or heats according to the set parameters in the automatic summer/winter mode according to the outdoor
temperature
and time dependencies.
Manual mode selection is also possible. The heater can be hot water, controlled by a three-point
actuator, or electric, directly controlled by SSR, or external TRIAC switches 0-10 V. Electric heater controlled by internal SSR can have up
to 36 kW depending on the cabinet, water heater is not limited mixing unit size). Cooling can be cold water, controlled by a 0-10 V analogue
actuator or direct in conjunction with a condensing cooling unit.
–
!
CAUTION!
For units with a direct evaporator (marked DX and
DXr in the unit code), it is possible to maintain the
required air temperature in the room with
accuracy, depending on the correctness of the
project and the correct function and setting of the
ventilation system with accuracy of ±2°C.
!
CAUTION!
SB and SC safety devices must always be
connected to the contactor circuit of the
electric heater!
