Master Bilt Master Controller 2.0 User Manual

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The ‘low room temperature alarm’ occurs when the room temperature is below the preprogrammed
‘LOW TEMPERATURE ALARM’ for a preprogrammed number of minutes. The alarm is cleared when
the room temperature is above the ‘LOW TEMPERATURE ALARM’ set point.
• Defrost term temp sensor alarm (CTSA)
o Defrost mode
 Open valve until alarm goes away or defrost terminates.
 If this alarm and outlet temp sensor alarm, defrost will last only three minutes.
 Use outlet sensor for defrost temperature termination
• Communication alarm (COMA)
o For Alternating mode, (ALTN) go to standalone mode.
o For Synchronous mode, (SYNC)
 Cool mode
• Run on superheat control for the minimum compressor run time
• Close valve for the minimum compressor off time
• Keep doing above cycle until alarm goes away.
 Pumpdown Mode
• Wait until pump down time times out.
 Drip Mode
• Wait until Drip time times out.
 Defrost Mode
• Valve will close when defrost termination temperature meets its set point if
reverse cycle defrost. Valve will close at all time if electric defrost. It will then
wait the full defrost time for other evaporators to defrost..
• If in demand defrost mode, defaults to three defrosts per day.
Multiple Evaporator Configuration
The Master Controller 2.0 can be configured with 0 to 7 other controllers. Each controller is appointed a static
I/P address at the factory for communication and sequence of operation. The evaporators are piped together to
one condensing unit. The room temperature sensor is mounted on any of the controllers. All controllers can
have a room temperature sensor connected for better control. All evaporators have a pressure transducer,
outlet sensor and coil sensor. All controllers will communicate with each other to share the room temperature
reading and the coil temperature reading. Allcontrollers will modulate its electric expansion valve independently
.
• The communication cable is a CAT/5E cable, up to 330 feet.
• Communication for peer to peer control are connected to the RJ-45 connector.
BOND CONTROLLERS FROM FRONT PANEL
• Connect to Ethernet switch or router only the controllers that you want to bond.
• On any controller, using the left and right buttons, go to Manual Mode (MNMD).
• Press ‘ENTER’, display will show Password (PSWD), press ‘ENTER’
• Using the left, right, up and down buttons enter ‘0002’ and hold ‘ENTER’ button until display shows one
of the manual modes.
• Using the up and down buttons, go to ‘BOND’, press ‘ENTER’, display will show ‘ITBD’ (initialize bond).
• Press and hold the ‘ENTER’ button until display shows ‘MNMD’. After about 5 seconds, all controllers
will reset. They are then bonded.
PEER TO PEER MODE
When power is turned on, that controller will initialize itself by closing the valve. A ‘ROOM TEMPERATURE’
sensor is needed to be connected to only one Controller. A ‘ROOM TEMPERATURE ALARM’ is set only if
none of the controllers have a good air temperature sensor connected. If it does not have a room temperature
sensor connected, it will put itself in ‘COOL’ mode and wait to get the room temperature from another
controller. If it does not receive any command within a minute, it will set the ‘communication alarm’ and then

Master Bilt Master Controller 2.0 Specifications

General

Brand	Master Bilt
Model	Master Controller 2.0
Category	Controller
Language	English