Kelvinator JT4BE048KA Installation Guide download pdf (Page 18)

ApplicationNotes&HeatModeVericationTables(HeatModeOnly)

• ReadallnotesandwarningsfortheCooling-mode

charging charts prior to using these Heating-mode

charge veriﬁcation charts. 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.

• Before using the heat mode verification tables,

determine the outdoor ambient temperature and the

return air temperature to the unit. Locate the appropriate

location on the units veriﬁcation chart based on those

measurements to determine the ideal discharge

pressure and temperature. See Table 12 (page 19),

Table 13 (page 19), Table 14 (page 19), Table 15

(page 19), Table 16 (page 20), Table 17 (page

20), & Table 18 (page 20). Verify the outdoor fan

and compressor are running and the outdoor coil is

free from frost accumulation. Also verify the system

is not operating in defrost mode before inspecting the

system.

• Alwaysusequalityinstrumentsthatareingoodworking

order to measure the actual operating point of the

refrigeration system. The discharge temperature should

be within 2 degrees of the ideal value and the pressure

should be within 2%.

• Themostreliablewayofverifyingthesystemisatthe

correct charge is to evacuate the system and weigh

in the charge to the amount shown on the rating label.

However, if an inspection with these veriﬁcation charts

does not line up with the values shown and the ambient

temperature is above 50˚ F, then a more accurate

way to inspect the system for proper charge is with

the cooling mode charging charts. Switch the unit into

cooling mode and allow it to operate and stabilize for

a few minutes then inspect the unit operation with the

cooling mode charts and procedures.

Before changing the unit charge, always inspect

the following items ﬁrst:

1. Inspect the liquid line temperature on the inlet and outlet

of the ﬁlter dryers. If it is the factory dryer and in good

condition there should be no temperature difference.

If the temperature difference is larger than 5˚, replace

the ﬁlter dryer with one that is bi-directional and has

acid removal capability. Refer to the unit RPL for the

recommended part number and size.

2. Inspect the units input voltage. Units operating at less

than 95% of the nominal voltage may deviate more from

the chart then previously stated.

3. Inspect the input voltage for a phase imbalance. Units

with greater then a 2% disparity will not operate at the

rated performance.

4. Verify that the unit ﬁlters are installed and are clean.

The pressure drop across the ﬁlters should not exceed

0.08 in-W.C.

5. Inspect the indoor coil, indoor blower and blower motor

for cleanliness, clogging, and proper operation.

6. Inspect the system for leaks. If any leaks are detected,

repair them immediately. Re-inspect the return air and

ambient temperatures and verify that the correct system

point on the veriﬁcation chart was selected.

DO NOT use the charts in systems that have the fan cycling

under a low-ambient control. Low-ambient controls are

for cooling operation. In heating mode, the low ambient

control should be disabled. Unless the unit is in defrost

mode, the outdoor fan should always operate in conjunction

with the compressor.

IMPORTANT NOTE:

If the unit is equipped with a liquid valve with an

outdoor restrictor as shown in Figure 2 (page 4),

then it is not possible to measure the liquid pressure.

To approximate the liquid pressure, subtract 7 psig

from the discharge pressure.

Shaded boxes indicate ﬂooded conditions.

Rated design values. The suction pressure will vary from design value if outdoor air ﬂow, entering dry

bulb, or entering wet bulb temperatures vary.

1. All pressures are listed in psig and all temperatures in ° F

2. Discharge temperatures greater than charted values indicate an undercharged system.

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Kelvinator JT4BE048KA Installation Guide Page 18

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