Carrier 40MVQ, 40MVC, 38MVQ, 38MVC service manual System Evacuation and Charging, Using Vacuum Pump

Page 19

SYSTEM EVACUATION AND CHARGING

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the recommended deep vacuum method of 500 microns. The alternate triple evacuation method may be used if the procedure outlined below is followed. Always break a vacuum with dry nitrogen.

SYSTEM VACUUM AND CHARGE

Using Vacuum Pump

1.Completely tighten flare nuts A, B, C, D, connect manifold gage charge hose to a charge port of the low side service valve. (See Fig. 15.)

2.Connect charge hose to vacuum pump.

3.Fully open the low side of manifold gage. (See Fig. 16)

4.Start vacuum pump

5.Evacuate using either deep vacuum or triple evacuation method.

6.After evacuation is complete, fully close the low side of manifold gage and stop operation of vacuum pump.

7.The factory charge contained in the outdoor unit is good for up to 25 ft. (8 m) of line length. For refrigerant lines longer than 25 ft (8 m), add 0.1 oz. per foot of extra piping up to the maximum allowable length.

8.Disconnect charge hose from charge connection of the low side service valve.

9.Fully open service valves B and A.

10.Securely tighten caps of service valves.

Outdoor Unit

Refrigerant

Indoor Unit

Low Side

C

A

 

 

D

B

High Side

 

Service Valve

 

 

 

 

A07360

Fig. 15 – Service Valve

 

Manifold Gage

 

500 microns

 

 

Low side valve

High side valve

Charge hose

Charge hose

 

 

 

Vacuum pump

Low side valve

A07361

Fig. 16 – Manifold

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water. (See Fig. 17)

5000

 

 

 

 

 

 

 

4500

 

 

 

 

 

 

 

4000

 

 

 

 

 

LEAK IN

3500

 

 

 

 

 

 

 

 

 

 

SYSTEM

3000

 

 

 

 

 

 

 

 

 

 

 

 

2500

 

 

 

 

 

 

 

MICRONS2000

 

 

 

 

 

VACUUM TIGHT

1500

 

 

 

 

 

 

 

 

 

 

TOO WET

1000

 

 

 

 

 

 

 

 

 

 

TIGHT

500

 

 

 

 

 

 

 

 

 

 

DRY SYSTEM

 

 

 

 

 

 

0

1

2

3

4

5

6

7

 

 

 

MINUTES

 

 

 

 

 

 

 

 

 

 

A95424

Fig. 17 – Deep Vacuum Graph

Triple Evacuation Method

The triple evacuation method should only be used when vacuum pump is only capable of pumping down to 28 in. of mercury vacuum and system does not contain any liquid water.

Refer to Fig. 18 and proceed as follows:

1.Pump system down to 28 in. of mercury and allow pump to continue operating for an additional 15 minutes.

2.Close service valves and shut off vacuum pump.

3.Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig.

4.Close service valve and allow system to stand for 1 hr. Dur- ing this time, dry nitrogen will be able to diffuse throughout the system absorbing moisture.

5.Repeat this procedure as indicated in Fig. 18. System will then be free of any contaminants and water vapor.

EVACUATE

BREAK VACUUM WITH DRY NITROGEN

WAIT

EVACUATE

BREAK VACUUM WITH DRY NITROGEN

WAIT

EVACUATE

CHECK FOR TIGHT, DRY SYSTEM (IF IT HOLDS DEEP VACUUM)

RELEASE CHARGE INTO SYSTEM

A95425

Fig. 18 – Triple Evacuation Method

Final Tubing Check

IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight.

38/40MVC, MVQ

19

Image 19
Contents Introduction 38MVC/40MVC 38MVQ/40MVQIndoor Unit Model Number NomenclatureStandard Features and Accessories System Model Number Specifications Cooling only UnitsCoil Outdoor Specifications Heat Pump UnitsService Valve Locations Clearances Indoor System Operating Envelope 53MVC/MVQ System Operating Envelope ChartElectrical Data Connection Diagrams Connection DiagramsWiring Diagram 38MVC009----1 W/ 40MVC009----1 Wiring DiagramsWiring 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 Cooling Refrigeration Cycle DiagramGeneral refrigerant line sizing Refrigerant LinesRefrigerant Charge System Evacuation and Charging Using Vacuum PumpCompressor Overcurrent Protection Minute Time DelayControl System System SafetiesIndoor Coil Freeze Protection Condenser High Temperature ProtectionIndoor High Temperature Protection Sequence of OperationModes of Operation Defrost Auto FanManual Operation Dry Dehumidification ModeForced Cooling Operation Recommended Steps TroubleshootingDiagnostic Hierarchy Required ToolsYes Chart 1 Indoor FAN Speed OUT of ControlChart 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 13 Receiver Board Chart 12 Reversing ValveAppendix Appendix Table of Contents Description Number38MVQ009---1/38MVQ012--- --- ---1 Control Board 38MVC009--- --- ---1/38MVC012--- --- ---1 Control BoardInput or Output Value 40MVC009--- --- ---1/40MVC012--- --- ---1 Control Board40MVQ012--- --- ---3 Control Board 38MVC012--- --- ---3 Control Board40MVC012--- --- ---3 Control Board 38MVQ012--- --- ---3 Control BoardControl Board 38MVC018--- --- ---3 Control BoardTemp. ˚F/˚C Resistance KΩ A6 Characteristics of Temperature Sensor18K & 24K Units 9K & 12K UnitsCatalog No.38---40MV---1SM
Related manuals
Manual 10 pages 47.7 Kb

40MVQ, 40MVC, 38MVQ, 38MVC specifications

The Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are advanced air-conditioning systems designed for both residential and commercial applications. These units are recognizable for their commitment to efficiency, reliability, and comfort, making them ideal choices for various environments.

One of the standout features of these models is their high energy efficiency ratings. Both the 38MVC and 38MVQ boast Seasonal Energy Efficiency Ratios (SEER) that exceed industry standards, delivering substantial energy savings over time. The 40MVC and 40MVQ models also continue this trend, featuring enhanced efficiency that translates into lower utility bills and a reduced carbon footprint.

These air-conditioning units utilize Carrier's innovative inverter technology, which allows for variable speed operation. This means that the compressor can adjust its speed according to the cooling demand, resulting in smoother temperature control and less energy consumption. The inverter technology not only maximizes comfort but also contributes to quieter operation, as the systems can run at lower speeds when full capacity is not required.

In addition to efficiency, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are equipped with advanced filtration systems. These systems work to purify the air by reducing allergens and pollutants, ensuring a healthier indoor environment. Some models also come equipped with smart connectivity options, allowing users to control their air conditioning remotely via a smartphone app. This feature adds convenience and helps monitor energy usage effectively.

With durable construction and high-quality components, these units are designed to withstand the test of time, reducing the need for frequent repairs or replacements. They are also built to operate quietly, so they can provide comfort without disturbing the peace of the indoor environment.

In terms of installation flexibility, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ can be easily integrated into various existing HVAC systems, thanks to their compatible size and design. This adaptability makes them suitable for a wide range of applications, from small residential homes to larger commercial spaces.

Overall, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ models are engineered with cutting-edge technologies that prioritize efficiency, comfort, and ease of use, making them an excellent choice for those looking to enhance their indoor climate control solutions.