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Application Notes & Heat Mode Verification 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.

Summary of Contents for T4BE-018 Series

Page 1: ...s 13 Figure 12 Charging Chart for 5 Ton Models 13 Refrigerant Charging Tables Cooling Mode Only 14 Table 5 Charging Table for 1 5 Ton Models 14 Table 6 Charging Table for 2 Ton Models 14 Table 7 Charg...

Page 2: ...er hazardous conditions which may result in personal injury or property damage Installation of equipment may require brazing operations Installer must comply with safety codes andwearappropriatesafety...

Page 3: ...ed immediately with the carrier Pleaseconsultyourdealerformaintenanceinformation and availability of maintenance contracts Please read all instructions before installing the unit Locating the Heat Pum...

Page 4: ...dryer is provided with the unit and must be installedintheliquidlineofthesystem Iftheinstallation replaces a system with a filter dryer already present in the liquid line the filter dryer must be rep...

Page 5: ...therestrictororificewhilebeingcarefulnottoscratch either part Carefully remove the restrictor orifice from the valve body See Figure 3 page 4 3 Check the actual size of the new orifice NOTE The size i...

Page 6: ...be properly connected to the units low voltage terminal block Recommended wire gauge and wire lengths for typical thermostat connections are listed in Table 2 The thermostat should be mounted about 5...

Page 7: ...terminal strip Verify that the power supply branch circuit overcurrent protection is sized properly Verify that the thermostat is wired correctly Start Up Procedures WARNING This unit is equipped wit...

Page 8: ...tween the test pins for more than 1 second will force the unit into a defrost cycle As soon as the jumper is removed the defrost cycle will end as determined by the typical criteria Verify the Status...

Page 9: ...ve Acommonsuctionportforheatingmodecharging is included and located on the compressor access panel above the outdoor unit service valves Heat Mode Verification Tables are provided for quick reference...

Page 10: ...e 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 per...

Page 11: ...Liquid Pressure psig Remove refrigerant when above the curve Add refrigerant when below the curve 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 75 80 85 90 95 10...

Page 12: ...he curve Add refrigerant when below the curve Figure 9 Charging Chart for 3 Ton Models TXV Matches 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 75 80 85 90 95 10...

Page 13: ...the curve Add refrigerant when below the curve Figure 11 Charging Chart for 4 Ton Models TXV Matches 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 75 80 85 90 95...

Page 14: ...4 135 236 115 255 120 137 238 115 257 120 276 125 139 240 116 259 121 278 126 297 131 141 242 116 261 121 280 126 299 131 318 136 143 263 122 282 127 301 132 320 137 339 142 145 285 128 304 132 323 13...

Page 15: ...S DIS TEMP 135 242 131 137 243 132 265 135 139 244 132 266 135 287 138 141 245 132 266 135 288 138 310 141 143 246 132 267 135 289 138 310 141 332 144 145 268 135 290 138 311 141 333 144 354 148 147 2...

Page 16: ...ESS DIS TEMP 132 248 128 134 248 128 269 133 136 248 128 269 133 290 137 138 248 128 269 133 290 137 310 141 140 249 129 269 133 290 137 311 141 331 146 142 270 133 290 137 311 141 332 146 352 150 144...

Page 17: ...172 408 178 141 365 166 387 172 409 178 143 388 172 410 178 145 411 178 147 Table 11 Charging Table for 5 Ton Models Restrictor Matches Shaded boxes indicate flooded conditions Rated design values The...

Page 18: ...arts 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 char...

Page 19: ...266 267 114 52 277 278 119 68 287 288 125 83 298 299 131 99 334 335 134 117 373 374 137 135 412 414 139 Table 14 Verification Table for 2 5 Ton Models OUTDOOR TEMPERATURE DEG F 0 10 20 30 40 50 60 SUC...

Page 20: ...81 292 139 104 307 318 150 120 332 343 161 30 221 232 105 45 239 250 112 60 257 268 120 75 275 286 127 90 288 299 136 105 314 325 146 121 339 350 155 31 228 239 103 46 245 256 110 61 261 272 118 76 27...

Page 21: ...y 3 Not suitable on systems that exceed 150 volts to ground 4 For replacement wires use conductors suitable for 105 C 5 For ampacities and overcurrent protection see unit rating plate 6 Connect to 24...

Page 22: ...ed 150 volts to ground 4 For replacement wires use conductors suitable for 105 C 5 For ampacities and overcurrent protection see unit rating plate 6 Connect to 24 vac 40va class 2 circuit See furnace...

Page 23: ...0 volts to ground 4 For replacement wires use conductors suitable for 105 C 5 For ampacities and overcurrent protection see unit rating plate 6 Connect to 24 vac 40va class 2 circuit See furnace air h...

Page 24: ...me Delay Relays Pressure Switches Transformers Relays MOTORS Blower Motor Fan Motor COMPONENTS Blower Assembly Fan Grille Cabinet Panels Filter Driers Expansion Valves REFRIGERATION SYSTEM Was unit gi...

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