Daikin Split A/C Interface Module ACT/DIN/AOP/SPLIT/001 Main Features Setpoint control of Daikin split A/C units Works with Daikin KRP interface boards Converts a 0-10VDC input voltage to 0-135 ohm resistance output on a linear scale Power to unit provided externally or by a SeaChange actuator module Daikin split A/C unit can be controlled via a SeaChange Zone Controller user interface to maintain the cooling setpoint, hence avoiding the need to have a separate A/C controller Cooling setpoint can be determined by the zone controller based on internal cooling demands to provide an energy efficient demand based system Can be setup to operate in conjunction with the heating system to avoid energy wastage due to simultaneous operation of heating and cooling system

General

The SeaChange RIF resistance interface has been designed to provide setpoint control of a Daikin split air conditioning system.  The module converts a 0-10V control signal to 0 to 135 ohm resistance output suitable for controlling a Daikin split unit via a KRP interface board.  The resistance module can be used standalone, or in conjunction with a SeaChange control system to provide full system integration with the heating and ventilation plant in the building.  By controlling the split air conditioning units on a SeaChange platform, we can avoid any energy wastage often seen on applications where more than one control system is used to maintain the internal conditions.  A SeaChange zone controller can be used to control one or more split air conditioning units using a combination of resistance modules and analogue actuator submodules (see below). The zone controller can provide automatic control of heating and cooling systems as well as providing optimum start/stop, weekly occupancy times and self learning intelligent temperature control and setpoint adjustment.

The resistance module is not a LON device and does not require configuring or registering on a SeaChange network.  The voltage to resistance calculations are carried out internally by a PIC microcontroller. 

Two outputs provide the required signal to the Daikin KRP interface board:

• The first output is an enable volt free contact. This is immediately activated when the module has been powered. The contact can switch AC or DC voltage to a maximum of 40 Volts.
   
• The second output is a variable resistance output suitable for Daikin Split unit supplied fitted with a suitable interface board. The amount of resistance output is controlled by the amount of control voltage applied to the 0-10V input.

Two inputs provide the control signal to the module:

• The first input provides power to the module. This can be either AC or DC from 8 Volts to a maximum of 24 Volts. The input is not polarity sensitive and can be powered by a SeaChange analogue actuator submodule (Daikin version).  An external power supply can be used to power the module provided it is a floating supply and the output is within the specified voltage range.  The power consumption is rated at 10mA from a voltage source of 8 volts or over.
   
• The second input is the 0-10VDC signal that controls the resistance output. Please note the input is polarity sensitive and must be connected correctly to ensure correct functionality, and to avoid damage to the input circuitry.

Daikin KRP Interface Typical Wiring

                                            Daikn KRP Interface Board

Voltage to Resistance Chart

The 0 to 135 ohm product conversion table is as follows:
 

 Using the RIF interface with a SeaChange AOP Sub Module

The resistance interface module can be directly controlled from an analogue actuator submodule specifically configured for Daikin split A/C units. One of the 0-10V outputs from the AOP actuator module provides power to the RIF module, and the other provides the 0-10V resistance control voltage.  This functionality is only provided on ACT/DIN/AOP/SPLIT/001 analogue actuator sub modules.

When the actuator is occupied and the demand level is greater than the minimum demand level (MIND) set in the actuator module, output A will be set at 10 volts, otherwise output A will be set to 0v. This output is used to power the resistive interface, and hence allow variable resistance to be seen at the output.

Note - the resistance seen at the output remains at 126.4 ohms when no power is applied to the resistive interface module.

Additional setting of the maximum and minimum output voltages on channel B (MXVB & MNVB parameters) can be used to trim the maximum and minimum output resistance values obtained with the resistive interface module.

The physical connections between the two modules are:

Note - the connections on the resistance interface module for the 0-10V input are polarity sensitive. Please ensure terminal 5 on the RIF module is connected to terminal 9 on the ACT module and terminal 6 on the RIF module is connected to terminal 10 on the ACT module.

Interface Module Status Indication

Status LED steady green = RIF module ON

Other Split A/C Units

We can provide other interface modules are available for suitable for are also available for Toshiba, Mitsubishi and Sanyo split A/C units. Please contact SC Controls to discuss your application.

North Building Technologies Interface Options

North Building Technologies are a system integration specialist and have developed a number of interface options to enable a SeaChange building energy management system to fully integrate with third party products and protocols including LON, BACnet, Modbus, M-Bus, Crestron and VRF systems.  View Presentation

 Please contact SC Controls for more details or if you wish to attend one of our "System Integration" presentations.  Alternatively you can email us sales@sccontrols.co.uk with your specific requirement.

SC Controls Ltd
PO Box313
Wadhurst
East Sussex
TN5 6JL

phone 08707 606040
fax 08707 606041
e-mail seachange@sccontrols.co.uk
http:// www.seachange.co.uk