Trane MP-4000, Operator'S Manual

19

Controller Description

•

Mode Description Descript unit 
operation

•

F1 – f4 Key Functions ALARM C/F 
SETPOINT MENU

GLOSSARY OF MODE 
DESCRIPTIONS

Chilled/cooling

Chilled cooling is a mode where the Unit 

setpoint is set to above -10C. The function here 

is to maintain setpoint temperature by 

controlling the temperature on the supply air.
The supply air is not allowed to be lower than 

the setpoint. Chilled/cooling mode can operate 

the unit in different modes where the 

compressor can run loaded, unloaded/loaded 

and vapor injection depending on the need for 

cooling capacity. The condenser fan will 

operate in an on/off algoritim depending on the 

temperature on the condenser. The evaporator 

fans will operate in either high or low speed 

mode depending on the need for capacity. 

Chilled/heating

Chilled heating is a mode the Unit setpoint is 

set to above -10C. The function here is to 

maintain setpoint temperature by controlling 

the temperature on the supply air.

The supply air is not allowed to be lower than 

the setpoint. Chilled heating mode can operate 

the unit where only the evaporator fan low 

speed is running, evaporator high speed is 

running or evaporator high speed and heat is 

on.

Frozen/cooling down

Frozen/cooling down mode where the Unit 

setpoint is set to below -10C. The function here 

is to maintain setpoint temperature by 

controlling the temperature on the return air.
Frozen/cooling down mode can operate the unit 

in different modes where the compressor is 

loaded and vapor injection is on/off. The 

condenser fan will operate in an on/off 

algoritim depending on the temperature on the 

condenser. The evaporator fans will operate in 

low speed mode or off. 

Defrost

Defrost is a situation where the unit either on 

demand or timing is defrosting the evaporator 

coil. The unit is heating with the heating 

elements awaiting 18C on the evaporator 

sensor.
When the set Defrost termination temperature 

is reached, the unit will return to the operation 

mode depending on the setpoint.

PTI

PTI is a pretrip inspection and is used to 

diagnose the condition of the unit. There are a 

possibility to chose between several type of 

PTI´s depending on the test needed to secure 

the functionality of the unit.

Function Keys

The function keys are the F1 - F4 keys located 

below the display. They allow the operator to 

move quickly to a specific area of the 

information or into the controller menu.
Function keys will change based on what menu 

is active in the display

Function Keys

• F1 INFO key: Press to view an explaination 

for the current alarms present.

• F2 C/F key: Press to view alternate 

temperature scale Celsius or Fahrenheit in 

display.

• F3 SETPOINT key: Press to enter Setpoint 

menu. Press F2 Up or F3 Down keys to 

increase or decrease the Setpoint. Press and