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

Page 25

XC14 SERIES

Page 24 Page 26
Page 25
Image 25
Lenox Elite Series, XC14 Checking AIR Flow AT Indoor Coil, Calculating System Charge for Outdoor Unit Void of Charge
Page 24 Page 26

Elite Series, XC14 specifications

The Lenox Elite Series XC14 is a remarkable tool designed for superior cutting performance in various applications. This saw blade stands out due to its innovative technologies and features, which cater to the needs of professionals in woodworking, metalworking, and general cutting tasks.

One of the key features of the XC14 is its carbide-tipped teeth. These teeth are engineered for longevity and efficiency, allowing for extended use without performance degradation. The unique geometry of the teeth enhances cutting speed while minimizing resistance, making it ideal for a range of materials including hardwoods, softwoods, and metals.

The blade’s construction is another significant aspect of its design. Made from high-quality steel, the XC14 ensures durability and resistance to bending or warping under stress. This robust construction contributes to the blade's overall stability, resulting in smoother cuts and reduced vibration during operation.

Another noteworthy technology embedded in the XC14 is its advanced tooth design. The combination of alternate top bevel (ATB) and flat (F) configurations allows for precision cutting and a cleaner finish. This feature is particularly beneficial when working on intricate projects that require a high level of accuracy.

To enhance performance further, the XC14 incorporates a unique thin kerf design. This design reduces the width of the cut, which not only conserves material but also requires less power from the saw. This energy efficiency translates to less wear on the saw, extending the lifecycle of both the blade and the tool itself.

The blade is also designed with heat dissipation in mind. Specially engineered cooling vents help in maintaining optimal temperature during operation. This technology reduces the risk of overheating, which can compromise the integrity of the blade and the quality of the cut.

Versatility is another standout feature of the Lenox Elite Series XC14. It is suitable for table saws, miter saws, and portable saws, making it a valuable tool for professionals and DIY enthusiasts alike. Whether tackling large construction projects, meticulous cabinetry, or small home repairs, the XC14 adapts efficiently to diverse cutting needs.

In conclusion, the Lenox Elite Series XC14 combines advanced technologies, premium materials, and thoughtful design to deliver exceptional cutting performance. Its carbide-tipped teeth, innovative geometry, stable construction, thin kerf, heat dissipation features, and versatility make it a top choice for those seeking reliable and efficient cutting solutions in various applications.
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