MLM Wall Comfort & Relative Humidity Controller | rickardair

MLM Wall Comfort & Relative Humidity Controller

The Rickard MLM/MLC Wall Comfort & Relative Humidity Controller has been designed to give the user primary temperature control and secondary RH level control to maintain comfort levels and keep RH levels in check respectively. The Comfort & Relative Humidity Controller senses temperature and controls the temperature of the zone by modulating the damper of each VAV diffuser. When the RH value rises above a threshold value, the diffusers open fully until the RH value is brought down to an acceptable level. Thereafter the diffuser returns to primary temperature control mode. The Relative Humidity of the supply air should be lower than the rooms relative humidity for the system to work correctly.

If the diffuser is in RH flush mode, the user can override it to revert to temperature control mode if required. This can be activated by pressing and holding the enter button until the controller buzzes.

The Comfort & Relative Humidity Controller converts any drone diffuser into a master so that it can control a zone of up to 15 diffusers. The new design boasts a modern, slim body, a larger digital screen for easier reading and discreet buttons on each side for setpoint adjustment and advanced user control.

To use the temperature/RH functionality of the Comfort & Relative Humidity Controller it is necessary to activate it through the latest MLM application. You can either setup the system with the wizard (see setup at the end of this section). 

AESTHETICS

DISPLAY BUTTONS
The Rickard Wall Comfort & Relative Humidity Controller has been designed with discreet buttons located on either side of its body. One side allows straight forward temperature adjustment and the other advanced user control.

Right Hand Side Buttons
The buttons located on the right hand side adjust the temperature up or down. The Up button increases and the Down button decreases the temperature set point.

Left Hand Side Buttons 
The buttons located on the side left hand side give the installer access to advanced commissioning functions. The Menu button is located above the Enter Button. Standard symbols depict Menu and Enter. Each press of the Menu buttons cycles through each option, the up and down buttons adjust the value and the enter button writes the value to memory. The RH flush mode can be overridden to revert to temperature control mode by pressing and holding the enter button until the controller buzzes.

TEMPERATURE DISPLAY 

The room temperature (default) or setpoint value will be displayed during normal temperature control mode.

FUNCTIONAL EDITING OPTIONS

The following display options are available.

Edit Set point Disable: When activated, the user is prevented from editing set point.

Setup Menu Enabled: When activated, the user has access to the Setup Menu.

RH DISPLAY 
The RH value will be displayed during the RH flush mode. Once the normal RH value is reached, the display will reflect that the diffuser has returned to temperature control mode.
TEMPERATURE SENSING ACCURACY
The Rickard Wall Comfort & Relative Humidity Controller has a built in sensing port designed to accurately sample room temperature.
NOTE: Consider the effect of a hot or cold wall on the Wall Comfort & Relative Humidity Controller sensing accuracy. External conditions can affect internal wall temperatures to such a degree that the Wall Comfort & Relative Humidity Controller sensing ability is also affected. Mount the Wall Controller on an opposite or adjacent wall if necessary.
RH SENSING ACCURACY
The Rickard MLM Wall Comfort & Relative Humidity Controller has a sensor port designed to accurately sample RH.
NOTE: Consider the effect of the RH controller location on sensing. The sensor should be positioned so that it senses a representative sample of room air.
COMPATIBILITY
Compatible with MLM or ML Controls provided each diffusers controller is loaded with RH sense firmware. Install the latest MLM application from the support section of the Rickard website to ensure you are prompted install the correct firmware.
INSTALLATION 
The Rickard Wall Comfort & Relative Humidity Controller is simple to install. It has been designed to be fitted to a standard 2 x 4 draw box or dry wall partitioning. To attach to a draw box use the 2 machine screws supplied. The diagonal slots allow horizontal and vertical alignment. Four additional round holes can be used for dry wall partitioning attachment. The controller comes with a 8 meter RJ12 cable for connection to a slave diffuser.
HARDWARE LIMITATIONS
PSU2 LIMITATION
A maximum of 10 Ventilation Controllers/PSU
A maximum of 10 diffusers and a total of 100m of inter-diffuser cables if the inter-diffuser cable between the PSU2 and 1st diffuser is 30m
or
A maximum of 15 diffusers and a total of 120m of inter- diffuser cables if each length is </=8m each.
RH WALL CONTROLLER LIMITATION
A maximum cable length of 15m between the diffuser and controller  is recommended.