Lenox Elite Series, XC14 installation instructions Checking AIR Flow AT Indoor Coil

Page 25
3. Determine if fan needs adjustment

CHECKING AIR FLOW AT INDOOR COIL

Check airflow using the Delta−T (DT) process using the illustration in figure 20.

Temp. of air entering indoor coil ºF

A

Dry−bulb

DT

80

24

24

24

23

23

22

22

22

20

19

18

17

16

15

78

23

23

23

22

22

21

21

20

19

18

17

16

15

14

76

22

22

22

21

21

20

19

19

18

17

16

15

14

13

74

21

21

21

20

19

19

18

17

16

16

15

14

13

12

72

20

20

19

18

17

17

16

15

15

14

13

12

11

10

70

19

19

18

18

17

17

16

15

15

14

13

12

11

10

1. Determine the desired DT

ature using dry bulb (A) and wet bulb (B). DT is the intersect- ing value of A and B in the table (see triangle).

2. Find temperature drop across coil

bulb entering and leaving air temperatures (A and C). Tem- perature Drop Formula: (TDrop) = A minus C.

Wet−bulb ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70

ference between

 

 

B

 

C

TDrop

 

 

 

 

 

53º

19º

 

 

 

 

 

 

air flow

air flow

B

DRY

 

 

64º

BULB

 

 

 

All temperatures are

INDOOR

 

COIL

 

expressed in ºF

 

 

 

A

72º

DRY

BULB

WET

BULB

the measured TDrop and the desired DT (TDrop–DT) is within +3º, no adjustment is needed. See examples: Assume DT =

15 and A temp. = 72º, these C temperatures would necessi- tate stated actions:

Cº

TDrop

–

DT

=

ºF

ACTION

53º

19

–

15

=

4

Increase the airflow

58º

14

–

15

=

−1

(within +3º range) no change

62º

10

–

15

=

−5

Decrease the airflow

4.Adjust the fan speed crease/decrease fan speed.

Changing air flow affects all temperatures; recheck tempera- tures to confirm that the temperature drop and DT are within +3º.

Figure 20. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart

WEIGH IN

CHARGING METHOD 64ºF (17.7ºC) and Below

CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE

If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit. To calculate the total refrigerant charge:

Amount specified on nameplate

Adjust amount. for variation in line set length listed on line set length table below.

Total charge

 

 

 

+

 

 

=

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigerant Charge per Line Set Length

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Liquid Line

Ounces per 5 feet (g per 1.5 m)

 

 

 

 

 

adjust from 15 feet (4.6 m) line set*

 

 

 

 

 

Set Diameter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3/8" (9.5 mm)

3 ounce per 5’ (85 g per 1.5 m)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*If line length is greater than 15 ft. (4.6 m), add this amount. If

 

 

 

line length is less than 15 ft. (4.6 m), subtract this amount.

NOTE

Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the

temperature of the liquid line or when pressure drop is equal to or greater than 20 psig.

NOTE

The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.

Figure 21. Using HFC−410A Weigh In Method

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XC14 SERIES

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Contents General Table of ContentsShipping and Packing List AIR ConditionerModel Number Identification Unit Dimensions − Inches mm230 Typical Unit Parts Arrangement Plumbing and Switches ComponentsControl Panel Using Manifold Gauge SET Operating Gauge Set and Service ValvesOperating Service Valves Torque RequirementsOperating Ball Type Service Valve Operating Angle Type Service ValveTo Access Service Port Reinstall Stem Cap1DISCONNECT Power Recovering Refrigerant from Existing SystemRecovering Refrigerant 2CONNECT Manifold Gauge SETClearance on ALL Sides Unit PlacementPositioning Considerations Placing Unit on SlabDetail C Elevated Slab Mounting using Feet Extenders Detail a Outside Unit PlacementDetail D Slab Side Mounting Detail E Deck Top MountingLouvered Panel Installation Removing and Installing PanelsRoof Mounting Louvered Panel RemovalRefrigerant Line SET New or Replacement Line SetRefrigerant Line Set Refrigerant Line SET Alling Horizontal Runs Refrigerant Line SET From Vertical to HorizontalBrazing Connections 1CUT and Debur Brazing ProceduresFlow Nitrogen Wrap Service Valves6BRAZE Line SET 7PREPARATION for Next StepFlushing Line Set and Indoor Coil Installing Indoor Expansion ValveIndoor Expansion Valve Installation Installing Indoor Metering DeviceSensing Bulb Installation Equalizer Line InstallationLeak Test Leak Test Line Set and Indoor CoilEvacuating System Evacuating Line Set and Indoor Coil2INSTALL Thermostat Size Circuit and Install DisconnectElectrical 24VAC TransformerVAC Control Wiring Diagrams Field Installed Typical Factory Wiring Diagram Interlink Compressor Typical Unit Wiring Diagram Servicing Units Delivered Void of Charge Connections for Testing and ChargingUnit Start−Up System RefrigerantWhich indoor Determining Charge MethodMetering Device?Calculating System Charge for Outdoor Unit Void of Charge Checking AIR Flow AT Indoor CoilBelow AboveSHº Superheat Values +/−5ºF 40ºFNormal Operating Pressures Liquid +10 and Suction +5 psig System OperationUnit Components Indoor Unit MaintenanceIndoor Coil Unit Nameplate ActualInstaller City Start−Up and Performance ChecklistJob Name Job no Date Job Location City State

Elite Series, XC14 specifications

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