Swegon e.r.i.c. 2006, 12 April
www.swegon.seerimix
Electronic regulation- optimisation for double-duct systems
FUNCTION
erimix is a system for optimising the temperature, air flow and pressure in systems with mixing boxes. The main controller communicates via LONTALK® with the room regulators to optimise the supply air temperature in the system.
QUICK FACTS
- Controls mixing boxes in the erimix system
- Pressure regulation from 10-300 Pa
- Temperature control with adjustable values
- Prevents unintentional heating/cooling
- LONMARK® -approved
QUICK GUIDE
F L O W R A N G E | | | | |
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| l/s | | |
Size | Min | at 5 m/s | Max |
160 | 16 | 100 | 270 |
200 | 25 | 155 | 430 |
250 | 40 | 240 | 680 |
315 | 65 | 390 | 1100 |
400 | 105 | 630 | 1700 |
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PLANNING
System selection E1-E3 is based on data for traditional ventilation systems.- System E1 is chosen when transferred air from rooms to common areas is not permitted.
- System E2 is the ideal choice when transferred air to common areas can be accepted.
- System E3 is chosen when you do not want a fully built out erimix system with individual room regulation or when room regulation is performed with another system. The supply air temperature in this system is determined by the common exhaust air temperature.
Zoning must be done so that the number of rooms that control the selected cooling/heating regulation in KZM can be kept to a smaller number than the total number of rooms linked to the zone controller KZM. This gives the general rule that zoning should always be chosen so that two different facades, for example, south/west are not included in the same zone, or that very large variations in room loads do not occur within the zone. The number of rooms that should be in cooling mode so that the zone controller switches to cold mixing is stated on the zone controller KZM. If only one or a few rooms have a cooling requirement, these will remain warm as long as the remainder of the rooms are in heating mode. The maximum number of room controllers that can be linked to a zone controller is nine.
Selection of product sizes is based on the product sheets for respective products. Duct selection is done according to the planning guide in the technical section of the e.r.i.c. catalogue.
The air is stratified in the duct after BLB, therefore must the temperatur probe be placed approx 4 m after BLB where the temperature is equalized.
Temperature selection is important in the erimix system. The regulation range for the duct temperature’s min/max values must always be at least one degree from the room temperature (including its variations), see figure 4. Consideration should also be given as to whether room heating is to be controlled using the same regulator, this has a dead zone of 2°C between the heating/cooling modes. The dead zone is adjustable on the room regulators (KCD). All temperature limits for cooling respective heating sequences are adjustable on the controller for KZP/KZM, with the help of the operator panel KOP.
Figure 1.Key diagram erimix system.
1. Constant pressure controller KZM
2. Mixing box BLB
3. Pressure sensor KSP
4. Room regulator KCD
5. Slave regulator KSA
6. Temperature probe for mixing temperature
DESIGN
The erimix system optimises the mixing of hot/cold air in double-duct systems with the aim of minimising the operating costs and increase flexibility. The main principle is based on a number of room regulators (max 9). These report room statuses to a mixing regulator which, based on room data, optimises the mixing temperature of the supply air. The intelligence of the room regulator prevents the rooms from becoming cold if there is a heating requirement and, at the same time, the supply air is colder than the room air and vice versa with a cooling requirement. The system is completely integrated with other e.r.i.c. components and in doing so can handle both maintaining a constant pressure, slave flow control and active supply diffusers/exhaust air terminals. Control of the air flow to the room can take place with several different control parameters such as temperature, CO2 and/or presence, for further information see the product sheet for the room controller KCD. In conformity with other e.r.i.c. solutions, the System Manager KSM can be used by the system for unit control to optimize fan operations.
Fully developed system with active supply/exhaust air terminals and balanced air flow in each room. The room regulators RC3 adjust the air flow to the room and report a cooling or heating instance and diffuser/damper positions to the zone controller RC1. SP1 maintains a constant pressure in the branch duct simultaneously with the mixing control of hot/cold air. RC1 is equipped with temperature sensors for the duct temperature, which is reported to respective room regulators. Active exhaust air terminals are used in the exhaust air system as well as zone controller RC2 to maintain a constant pressure.
List of components: | |
SP0 | Mixing box BLB |
SP1 | Zone controller KZM with RC1 and GT1 |
GP1 | Pressure sensor KSP |
TD1 | Active supply air diffuser, for example AKY |
GT3 | Room unit KST |
RC3 | Room regulator KCD |
SP2 | Zone controller KZM with RC2 |
FD1 | Active exhaust air terminal, type AFK |
System with full control of the supply air side as in system E1, but with transferred air to common controlled exhaust air flow. The exhaust air flow is controlled by slave controller RC2, which obtains the set point value from RC1 in the supply air branch. This system also allows you to control the supply air temperature against the common exhaust air temperature.
List of components: | |
SP0 | Mixing box BLB |
SP1 | Zone controller KZM with RC1 and GT1 |
GP1 | Pressure sensor KSP |
TD1 | Active supply air diffuer, for example AKY |
GT3 | Room unit KST |
RC3 | Room regulator KCD |
SP2 | Slave regulator KSA with RC2 and GT2 |
Figure 2.Flow chart erimix system E1.
Figure 3.Flow chart erimix system E2.
System for constant or requirement controlled air flow with other regulators than KCD. The mixing temperature on the supply air is controlled by the common exhaust air temperature. There is still constant pressure control with flow measuring on the supply air branch. There is a slave controller RC2 for slave control of the air flow and temperature metering on the exhaust air branch
List of compenents: | |
SP0 | Mixing box BLB |
SP1 | Zone controller KZM with RC1 and GT1 |
GP1 | Pressure sensor KSP |
SP2 | Slave regulator KSA with RC2 and GT2 |
Default temperature valuesMixing temperature- Cooling, between 14ºC - 18°C
- Heating, between 26°C - 30°C
Room temperatures- In occupancy mode cooling 23°C, heat 21°C. The values are adjustable ±3° on room unit KST
- In standby mode with values corresponding to 25°C and 19°C
COMMISSIONING
The regulators are normally set at the factory to control the erimix system according to the specification. Readjustment can be done using the operator panel KOP or via the LON network with the help of LONMAKERtm for Windows or similar programs. For detailed instructions, see the adjustment instructions for the e.r.i.c. system.
Figure 4.Flow chart erimix system E3.
Figure 5.Temperature range for mixing temperature.
Legend:- Regulation curves for cold mixing temperature.
- Variation in the room at a set point value of 23°C, which includes the dead zone between heating/cooling modes.
- Regulation curves for heat mixing temperature.
LONTALK® bindnings
The erimix system requires communication between the regulators in the system in order to adjust temperatures and slave flows correctly. Figure 6 show the bindnings (double-dotted lines) for system E1 with 3 unit regulators. The variable name can also be seen in the figure, these bindnings are a prerequisite for the system’s operation. The network required for this communication can be of the “standalone” type, i.e. only one network cable between respective regulators, no connection to a master system.
Figure 6. Shows bindnings for communications between the regulators.
CONNECTION
KZM, BLB and KSP are connected to a 24 V AC power supply and are fuse protected with max 6 A. Connection to the room regulators takes place according to the wiring diagram for KCD, as well as binding via LONTALK® communications.
Electrical data
Input voltage | 24 V AC -10% +20%, 50-60 Hz |
Operation of KOP connected via the controller requires | ³ 23 V AC |
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Power consumption: | |
Regulator with operator panel KOP | 4 VA |
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Typical power consumption: | |
erimix with BLB, 9 pcs KCD and 18 pcs Active diffuser | 130 VA |
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Compatibility: | |
Standard conforms to | 0 °C – +50 °C |
LONMARK® Interoperability Guidelines and |