Kelvinator JS4BD030KB Installation Guide download pdf (Page 8)

Charging the Unit in AC mode at outdoor temperatures

above55°Fforoptimizedsub-coolingof10°F-12°F.

1. With the system operating at steady-state, measure the

liquid refrigerant pressure (in psig) at the outdoor unit

service valve.

2. Measure the liquid refrigerant temperature (in

Fahrenheit) at the service valve.

3. Determine the required liquid refrigerant pressure from

the appropriate charging chart (Figures 3 - 9).

• IfthepressuremeasuredinStep1isgreaterthan

the required liquid refrigerant pressure determined in

Step 3, then there is too much charge in the system.

Remove refrigerant and repeat Steps 1 through 3

until the system is correctly charged.

• IfthepressuremeasuredinStep1islessthanthe

required liquid refrigerant pressure determined in

Step 3, there is too little charge in the system. Add

refrigerant and repeat Steps 1 through 3 until the

system is correctly charged.

Application Notes for Using Charging Charts

• This equipment’s cooling system contains

refrigerant under high pressure. Always use

safe and environmentally sound methods when

handling refrigerant handling or servicing the unit.

Review the factory literature and safety warnings

prior to servicing.

• Whenrepairingsystemleaks,alwaysuseanitrogen

(inert) gas to protect the refrigerant system and pressure

check the repair before re-charging. Always replace

the ﬁlter-dryers when performing any repair to the

refrigeration system with one capable of acid removal.

After completing the repairs, evacuate the system to

350 - 500 microns and weigh in the refrigerant to the

amount speciﬁed on the unit rating label.

• Chargingchartsarevalidforavarietyofindoor,return

air conditions and are most inﬂuenced by the outdoor

ambient temperature, outdoor fan operation and the

unit operating voltage. Before using these charts, make

sure the unit is in a stable operating mode. As shown

in the charging charts (Figures 3 - 9, pages 8 - 11), the

ideal system sub-cooling can vary over the range of

operation. Reference the charts to determine the ideal

amount of sub-cooling for a given liquid pressure. Units

charged to other values will not perform at the rated unit

efﬁciency (EER) or rated Coefﬁcient of Performance

(COP) in heating mode.

• To inspect a systems operation using quality

instruments, match the measured liquid temperature

to the units chart. The measured liquid pressure

reading should be within 3% of the charts value for

most installations.

• Forsystemsthatareoperatingwithmorethana5%

deviation, inspect the unit for the proper voltage and

phase balance and the refrigeration system for leaks.

• Unitsthatareoperatingatlessthen95%ofthenominal

voltage or with a 2% phase imbalance may see a more

signiﬁcant deviation than the amount stated above.

• DO NOT use the charts in systems that have a

fan cycling under low-ambient control. Refer to the

low-ambient kit instructions for more information. (If

applicable)

250

275

300

325

350

375

400

425

450

475

500

525

550

575

600

70 75 80 85 90 95 100105 110 115 120125 130

Liquid Temperature (F)

Liquid Pressure (psig)

Remove refrigerant when above the curve

Add refrigerant when below the curve

Figure 3. Charging Chart for S4BD-018 Series (1.5 Ton Units) - TXV Matches

S4BD REFRIGERANT CHARGING CHARTS

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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Kelvinator JS4BD030KB Installation Guide Page 8

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