Carrier 38MVC, 40MVC, 38MVQ, 40MVQ service manual Modes of Operation

Page 22

38/40MVC, MVQ

MODES OF OPERATION

The units have 5 main operating modes:

1.Fan Only

2.Cooling

3.Heating (heat pumps only)

4.Auto

5.Dehumidification (Dry)

The units have 2 other modes (manual operation) that are operated in unique situations:

1.Auto Forced Mode (Emergency)

2.Test Mode

Fan Mode Only

In this mode, the system circulates the room air without changing the room air temperature.

Cooling Mode

In this mode, the system cools and dries the room air with the fan running continuously, either at a selected fan speed or Auto fan speed. The fan runs even when the compressor cycles off. This feature enhances room comfort and efficiency of the system.

When the unit is operating in cooling, two sub modes can also be selected:

1.Sleep Mode is an energy saving feature that changes the set point automatically.

2.Turbo Mode is a comfort feature on the 9k and 12k units where the set point is reached quickly by having the fan run on high speed regardless of the speed that has been selected.

Compressor and Outdoor Fan Operation

The compressor and outdoor fan motor cycle on and off based on the conditions of the set point and the room temperature as shown below. There is no minimum run time.

 

 

 

 

 

 

 

Compressor and

 

 

 

 

 

 

 

 

 

 

 

outdoor fan on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Roo

m

temp. down

 

 

Room temp.

 

up

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor off

 

 

 

 

 

 

 

 

 

 

 

 

fan off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T = Room Temperature

0 1.8°F

T-Ts

 

Ts = Set Point Temperature

 

 

 

 

 

 

 

A08106

Fig. 24 – Compressor and Outdoor Fan - Cooling Mode

Indoor Fan Operation

When in cooling mode, the fan runs continuously either at the chosen set speed , or in Auto mode, where the speed is determined by the microprocessor based on the difference between the room temperature and the temperature set point as shown below:

 

 

 

 

 

 

 

 

 

 

 

High fan

 

 

 

 

 

 

Med fan

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Room te

m

p. down

 

 

 

 

Room

te

mp. up

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low fan

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.8 °F

7.2 °F 9.0 °F

T-Ts

T= Room Temperature

 

 

 

 

 

 

 

 

 

Ts = Set Point Temperature

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A08107

Fig. 25 – Auto Fan - Cooling Mode

Sleep Mode

When in cooling mode, additional energy savings can be realized by selecting the Sleep setting. When the Sleep setting is selected, the temperature set point is adjusted automatically as shown below:

Set point

 

1.8°F

 

1.8°F

 

 

1

2

Time (hour)

A08108

Fig. 26 – Sleep Mode

The unit will shut off 7 hours after the Sleep Mode is selected.

Turbo Mode

When in cooling mode, selecting Turbo will allow the indoor unit to satisfy the temperature set point as quickly as possible. In Turbo Mode, the indoor fan will shift to high speed and either run continuously for 20 minutes or until the user pushes the Turbo button again, at which point the fan speed will return to the original setting.

Heating Mode

In this mode, the system heats the room air with the indoor fan running at either the selected speed or on Auto. As in the cooling mode, the indoor fan will run continuously unless interrupted by the cold blow algorithm. This algorithm will not allow the fan to run if the indoor coil temperature drops below a preset value.

The sleep function can be selected while the unit is running in the Heating Mode. Defrost is controlled by the on-board microprocessor.

Compressor and Fan Operation

The compressor and outdoor fan cycle on and off based on the actual room temperature versus the set point as shown below. When the compressor starts, it will run continuously for 7 minutes even if the set point condition is satisfied.

The 4-way value is energized in heating and will stay energized for 2 minutes after the mode is changed into a non-heating mode.

Compressor on outdoor fan off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Room te

m

p. down

 

 

 

 

 

 

 

 

 

Compressor off

 

 

Room

te

mp. up

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

outdoor fan on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ts

Ts+3.6*

Ts+5.4*

T

T= Room Temperature TS = Set Point Temperature

* For 9k & 12k Units Only. For 18k and 24k units, numbers will be 5.4 and 7.2 respectively.

A08109

Fig. 27 – Compressor and Outdoor Fan - Heating Mode

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Contents 38MVC/40MVC 38MVQ/40MVQ IntroductionModel Number Nomenclature Indoor UnitStandard Features and Accessories System Model Number Specifications Cooling only UnitsCoil Specifications Heat Pump Units OutdoorService Valve Locations Clearances Indoor System Operating Envelope 53MVC/MVQ System Operating Envelope ChartElectrical Data Connection Diagrams Connection DiagramsWiring Diagrams Wiring Diagram 38MVC009----1 W/ 40MVC009----1Wiring Diagram 38MVC012----1 W/ 40MVC012----1 Wiring Diagram 38MVC012----3 W/ 40MVC012----3 Wiring Diagram 38MVC018----3 W/ 40MVC018----3 Wiring Diagram 38MVQ009----1 W/ 40MVQ009----1 Wiring Diagram 38MVQ012----1 W/ 40MVQ012----1 Wiring Diagram 38MVQ012----3 W/ 40MVQ012----3 Refrigeration Cycle Diagram CoolingGeneral refrigerant line sizing Refrigerant LinesRefrigerant Charge Using Vacuum Pump System Evacuation and ChargingSystem Safeties Minute Time DelayControl System Compressor Overcurrent ProtectionSequence of Operation Condenser High Temperature ProtectionIndoor High Temperature Protection Indoor Coil Freeze ProtectionModes of Operation Auto Fan DefrostManual Operation Dry Dehumidification ModeForced Cooling Operation Required Tools TroubleshootingDiagnostic Hierarchy Recommended StepsChart 1 Indoor FAN Speed OUT of Control YesChart 2 Temperature Sensor Chart 3 Compressor Overcurrent Protection Chart 4 Indoor Unit Communication Error Size 9K and 12K Chart 5 Outdoor Unit Protects Chart 6 Indoor Unit Communication Error Size 18K and 24K Chart 7 Unit not RUNNING, no Diagnostic Code Chart 8 Unit not Running Optimally Chart 9 Unit not Running Optimally HP in Heating Chart 10 Compressor Chart 11 Outdoor Motor Chart 12 Reversing Valve Chart 13 Receiver BoardAppendix Table of Contents Description Number Appendix40MVC009--- --- ---1/40MVC012--- --- ---1 Control Board 38MVC009--- --- ---1/38MVC012--- --- ---1 Control BoardInput or Output Value 38MVQ009---1/38MVQ012--- --- ---1 Control Board38MVQ012--- --- ---3 Control Board 38MVC012--- --- ---3 Control Board40MVC012--- --- ---3 Control Board 40MVQ012--- --- ---3 Control Board38MVC018--- --- ---3 Control Board Control BoardA6 Characteristics of Temperature Sensor Temp. ˚F/˚C Resistance KΩ9K & 12K Units 18K & 24K UnitsCatalog No.38---40MV---1SM
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40MVQ, 40MVC, 38MVQ, 38MVC specifications

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