International Comfort Products R4A318A*KA100, WCA3184GKA1, R4A324A*KA100, WCA3244GKA1, R4A330A*KA100 TECHNICAL MANUAL

TECHNICAL SUPPORT MANUAL

Split System Air Conditioner

R4A3, WCA3**4

Safety Labeling and Signal Words

DANGER, WARNING, CAUTION, and
NOTE

The signal words DANGER, WARNING, CAU­TION, and NOTE are used to identify levels of haz-

ard seriousness. The signal word DANGER is only
used on product labels to signify an immediate haz­ard. The signal words WARNING, CAUTION, and
NOTE will be used on product labels and through­out this manual and other manuals that may apply
to the product.

DANGER − Immediate hazards which will result in
severe personal injury or death.

WARNING − Hazards or unsafe practices which
could result in severe personal injury or death.

CAUTION − Hazards or unsafe practices which
may result in minor personal injury or product or

property damage.

NOTE − Used to highlight suggestions which will
result in enhanced installation, reliability, or opera­tion.

Signal Words in Manuals

The signal word WARNING is used throughout this
manual in the following manner:

!

The signal word CAUTION is used throughout this
manual in the following manner:

!

Signal Words on Product Labeling

Signal words are used in combination with colors
and/or pictures on product labels.

WARNING

WARNING

CAUTION

TABLE OF CONTENTS

Wiring Diagram 2................................

Charging Chart 3.................................

Tech Labels (Expanded Data) 4 − 10................

R4A3 Cooling Multipying Factors 11 − 14............

WCA3**4 Cooling Multipying Factors 15 − 16.........

Model Number Identification 17 − 18................

R4A318A*KA100 WCA3184GKA1
R4A324A*KA100 WCA3244GKA1
R4A330A*KA100 WCA3304GKA1
R4A336A*KB100 WCA3364GKA1
R4A342A*KB100 WCA3424GKA1
R4A348A*KB100 WCA3484GKA1
R4A360A*KB100 WCA3604GKA1
* = A for standard inlet grille,
G for inlet grille with 3/8” (10mm) tight−wire spacing

!

DEATH, PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD

Failure to carefully read and follow this warning
could result in equipment malfunction, property
damage, personal injury and/or death.

Installation or repairs made by unqualified per­sons could result in equipment malfunction, prop­erty damage, personal injury and/or death.

The information contained in this manual is in­tended for use by a qualified service technician fa­miliar with safety procedures and equipped with
the proper tools and test instruments.

Installation must conform with local building
codes and with the National Electrical Code
NFPA70 current edition or Canadian Electrical
Code Part 1 CSA C.22.1.

WARNING

421 04 6001 00 April 2010

2 421 04 6001 00

TECHNICAL SUPPORT MANUAL Split System Air Conditioner: R4A3, WCA3**4

Model Sizes: 18, 24, 30, 36, 42, 48, 60

1. Symbols are electrical representation only.

2. Compressor and fan motor furnished with inherent thermal protection.

3. To be wired in accordance with National Electric N.E.C. and local codes.

4. N.E.C. class 2, 24 V circuit, min. 40 VA required, 60 VA on units installed with LLS.

5. Use copper conductors only. Use conductors suitable for at least 75°C (167°F).

6. Connection for typical cooling only thermostat. For other arrangements see installation instructions.

7. If indoor section has a transformer with a grounded secondary, connect the grounded side to the BRN/YEL lead.

8. When start capacitor and relay are installed, start thermistor (PTC) is not used.

9. CH not used on all units.

10. If any of the original wire, as supplied, must be replaced, use the same or equivalent wire.

11. Check all electrical connections inside control box for tightness.

12. Do not attempt to operate unit until service valves have been opened.

13. Do not rapid cycle compressor. Compressor must be off 3 minutes to allow pressures to equalize between high and low side before starting.

14. Wire not present if HPS, LPS or CTD are used.

335620−101 REV. B

TECHNICAL SUPPORT MANUAL Split System Air Conditioner: R4A3, WCA3**4

R−410A CHARGING CHART

Rating Plate (required) Subcooling Temperature ° F (° C)

Measured Liquid

Pressure (psig)

251 78 26 76 24 74 23 72 22 70 21 68 20
259 80 27 78 26 76 24 74 23 72 22 70 21
266 82 28 80 27 78 26 76 24 74 23 72 22
274 84 29 82 28 80 27 78 26 76 24 74 23
283 86 30 84 29 82 28 80 27 78 26 76 24
291 88 31 86 30 84 29 82 28 80 27 78 26
299 90 32 88 31 86 30 84 29 82 28 80 27
308 92 33 90 32 88 31 86 30 84 29 82 28
317 94 34 92 33 90 32 88 31 86 30 84 29
326 96 36 94 34 92 33 90 32 88 31 86 30
335 98 37 96 36 94 34 92 33 90 32 88 31
345 100 38 98 37 96 36 94 34 92 33 90 32
364 104 40 102 39 100 38 98 37 96 36 94 34
374 106 41 104 40 102 39 100 38 98 37 96 36
384 108 42 106 41 104 40 102 39 100 38 98 37
395 110 43 108 42 106 41 104 40 102 39 100 38
406 112 44 11 0 43 108 42 106 41 104 40 102 39
416 114 46 11 2 44 110 43 108 42 106 41 104 40
427 116 47 11 4 46 112 44 11 0 43 108 42 106 41
439 118 48 11 6 47 114 46 11 2 44 110 43 108 42
450 120 49 118 48 116 47 114 46 112 44 11 0 43
462 122 50 120 49 11 8 48 116 47 11 4 46 112 44
474 124 51 122 50 120 49 118 48 11 6 47 114 46

° F (° C) ° F (° C) ° F (° C) ° F (° C) F (° C) F (° C)

6 3 8 4 10 6 12 7 14 8 16 9

R−410A Required Liquid Line Temperature ° F (° C)

421 04 6001 00 3

4 421 04 6001 00

† Total capacities are net (I.D. blower heat subtracted) system capacities based on 25’ line set.

†† At TVA rating indoor condition (75 °F db, 63 °F wb), all other indoor air temperatures are at 80 ° F db

^ System amps are total of indoor and outdoor amps.

‡ Chart data is for 80° F indoor dry bulb. For indoor db temperatures other than 80° F, measure Indoor db and Indoor CFM, and plug these into the
formula below. Measure outdoor db and indoor wet bulb, apply these to the chart above, find MBh and S/T, and plug these into the formula below.
(Note: if indoor db is the only thing changing, total capacity, MBh, stays the same.)

18 Size Outdoor With ED*4X18B** Indoor Cooling

Outdoor Ambient Temperature − Degrees F, Dry Bulb

511501595857

Entering Indoor Temperature − Degrees F, Wet Bulb

CFM 7267625772676257726762577267625772676257

MBh†

525

AMPS*

HI PR

LO PR

MBh†

600

AMPS* 5.22 5.29 5.36 5.37 5.96 6.04 6.10 6.11 6.78 6.86 6.92 6.92 7.70 7.78 7.84 7.84 8.72 8.80 8.85 8.85

HI PR

LO PR

MBh†

675

AMPS*

HI PR

LO PR

If additional tubing length and/or indoor unit is located above outdoor unit, a slight variation in capacity may occur.

If additional tubing length and/or indoor unit is located above outdoor unit, a slight variation in capacity may occur.

20.35 18.72 17.21 16.70 19.43 17.86 16.41 16.05 18.46 16.95 15.59 15.37 17.51 16.04 14.75 14.67 16.49 15.07 13.92 13.92

S/T‡

S/T‡

S/T‡

0.50 0.66 0.86 1.00 0.50 0.68 0.88 1.00 0.51 0.69 0.90 1.00 0.52 0.71 0.92 1.00 0.53 0.73 1.00 1.00

5.11 5.19 5.26 5.28 5.86 5.94 6.00 6.02 6.68 6.76 6.82 6.84 7.60 7.68 7.75 7.75 8.61 8.70 8.77 8.77
286 282 279 277 329 325 321 320 376 372 368 368 428 424 421 421 485 482 479 479
155 142 130 126 158 144 132 130 160 146 135 133 162 149 138 137 165 151 141 141

20.73 19.03 17.59 17.38 19.69 18.14 16.78 16.69 18.69 17.20 15.95 15.97 17.72 16.27 15.23 15.23 16.67 15.27 14.44 14.44

0.51 0.69 0.90 1.00 0.52 0.71 0.92 1.00 0.53 0.73 1.00 1.00 0.54 0.75 1.00 1.00 0.55 0.77 1.00 1.00

287 283 280 279 330 326 323 322 377 373 370 370 429 425 422 422 486 482 480 480
159 145 134 132 161 147 136 136 163 150 139 139 165 152 143 143 168 154 147 147

21.01 19.25 17.94 17.92 19.88 18.34 17.20 17.20 18.85 17.38 16.44 16.44 17.86 16.43 15.67 15.67 16.79 15.41 14.84 14.84

0.53 0.72 0.99 1.00 0.54 0.74 1.00 1.00 0.55 0.76 1.00 1.00 0.56 0.78 1.00 1.00 0.57 0.81 1.00 1.00

5.33 5.40 5.46 5.46 6.06 6.14 6.20 6.20 6.89 6.97 7.02 7.02 7.81 7.89 7.93 7.93 8.82 8.91 8.94 8.94
288 284 281 281 331 327 324 324 378 374 371 371 430 426 424 424 487 483 482 482
162 148 138 137 164 150 141 141 166 152 144 144 168 154 148 148 170 157 151 151

TECHNICAL SUPPORT MANUAL Split System Air Conditioner: R4A3, WCA3**4

Sensible Capacity at Indoor db LOWER than 80 ° F = ( MBh x S/T ) −

Sensible Capacity at Indoor db HIGHER than 80 ° F = ( MBh x S/T ) +

( 80 − Indoor db ) x 835 x Indoor CFM

(

( Indoor db − 80 ) x 835 x Indoor CFM

(

1000

1000

)
)

421 04 6001 00 5

24 Size Outdoor With ED*4X24B** Indoor Cooling

Outdoor Ambient Temperature − Degrees F, Dry Bulb

511501595857

Entering Indoor Temperature − Degrees F, Wet Bulb

CFM 7267625772676257726762577267625772676257

MBh† 27.06 24.87 22.98 22.41 25.82 23.82 22.00 21.61 24.64 22.70 20.97 20.75 23.44 21.55 19.91 19.85 22.11 20.29 18.87 18.87

S/T‡

700

AMPS*

HI PR

LO PR

MBh†

S/T‡

800

AMPS*

HI PR

LO PR

MBh†

S/T‡

900

AMPS*

HI PR

LO PR

† Total capacities are net (I.D. blower heat subtracted) system capacities based on 25’ line set.

If additional tubing length and/or indoor unit is located above outdoor unit, a slight variation in capacity may occur.

†† At TVA rating indoor condition (75 °F db, 63 °F wb), all other indoor air temperatures are at 80 ° F db

If additional tubing length and/or indoor unit is located above outdoor unit, a slight variation in capacity may occur.

^ System amps are total of indoor and outdoor amps.

‡ Chart data is for 80° F indoor dry bulb. For indoor db temperatures other than 80° F, measure Indoor db and Indoor CFM, and plug these into the
formula below. Measure outdoor db and indoor wet bulb, apply these to the chart above, find MBh and S/T, and plug these into the formula below.
(Note: if indoor db is the only thing changing, total capacity, MBh, stays the same.)

0.49 0.66 0.85 1.00 0.50 0.67 0.87 1.00 0.50 0.69 0.89 1.00 0.51 0.70 0.91 1.00 0.52 0.72 1.00 1.00

7.15 7.12 7.10 7.10 8.00 7.98 7.96 7.96 8.95 8.93 8.92 8.92 10.01 9.99 9.98 9.98 11.17 11.16 11.16 11.16
291 286 283 281 335 330 326 325 383 378 374 374 436 431 427 427 493 489 486 486
156 142 130 127 158 144 132 130 160 146 135 133 162 148 137 137 164 151 140 140

27.49 25.24 23.44 23.25 26.14 24.15 22.46 22.40 24.93 23.00 21.49 21.49 23.69 21.83 20.55 20.55 22.33 20.54 19.52 19.52

0.51 0.69 0.89 1.00 0.52 0.71 0.91 1.00 0.52 0.72 1.00 1.00 0.53 0.74 1.00 1.00 0.55 0.76 1.00 1.00

7.31 7.28 7.27 7.26 8.16 8.14 8.13 8.12 9.11 9.09 9.08 9.08 10.17 10.15 10.14 10.14 11.32 11.32 11.32 11.32
292 287 284 283 336 331 328 327 384 379 376 376 437 432 429 429 494 490 487 487
159 146 134 133 161 147 136 136 163 149 139 139 165 151 143 143 167 154 146 146

27.76 25.50 23.92 23.92 26.38 24.39 23.03 23.04 25.12 23.21 22.08 22.08 23.86 22.02 21.10 21.10 22.46 20.70 20.02 20.02

0.52 0.72 1.00 1.00 0.53 0.74 1.00 1.00 0.54 0.76 1.00 1.00 0.55 0.78 1.00 1.00 0.57 0.80 1.00 1.00

7.48 7.44 7.43 7.43 8.32 8.30 8.29 8.29 9.27 9.25 9.24 9.24 10.33 10.31 10.30 10.30 11.48 11.47 11.47 11.47
293 288 285 285 337 332 329 329 385 380 377 377 438 433 431 431 495 490 489 489
162 148 138 138 164 150 141 141 166 152 144 144 168 154 148 148 170 156 151 151

TECHNICAL SUPPORT MANUAL Split System Air Conditioner: R4A3, WCA3**4

Sensible Capacity at Indoor db LOWER than 80 ° F = ( MBh x S/T ) −

Sensible Capacity at Indoor db HIGHER than 80 ° F = ( MBh x S/T ) +

( 80 − Indoor db ) x 835 x Indoor CFM

(

( Indoor db − 80 ) x 835 x Indoor CFM

(

1000

1000

)
)

6 421 04 6001 00

† Total capacities are net (I.D. blower heat subtracted) system capacities based on 25’ line set.

†† At TVA rating indoor condition (75 °F db, 63 °F wb), all other indoor air temperatures are at 80 ° F db

^ System amps are total of indoor and outdoor amps.

‡ Chart data is for 80° F indoor dry bulb. For indoor db temperatures other than 80° F, measure Indoor db and Indoor CFM, and plug these into the
formula below. Measure outdoor db and indoor wet bulb, apply these to the chart above, find MBh and S/T, and plug these into the formula below.
(Note: if indoor db is the only thing changing, total capacity, MBh, stays the same.)

30 Size Outdoor With ED*4X30B** Indoor Cooling

Outdoor Ambient Temperature − Degrees F, Dry Bulb

511501595857

Entering Indoor Temperature − Degrees F, Wet Bulb

CFM 7267625772676257726762577267625772676257

MBh†

875

AMPS*

HI PR

LO PR

MBh†

1000

AMPS* 8.79 8.75 8.73 8.73 9.83 9.79 9.78 9.78 10.98 10.95 10.93 10.93 12.26 12.24 12.23 12.23 13.66 13.65 13.65 13.65

HI PR

LO PR

MBh†

1125

AMPS*

HI PR

LO PR

If additional tubing length and/or indoor unit is located above outdoor unit, a slight variation in capacity may occur.

If additional tubing length and/or indoor unit is located above outdoor unit, a slight variation in capacity may occur.

31.88 29.45 27.29 26.90 30.55 28.21 26.15 25.94 29.17 26.90 24.96 24.91 27.73 25.54 23.83 23.83 26.14 24.04 22.65 22.65

S/T‡

S/T‡

S/T‡

0.52 0.70 0.91 1.00 0.53 0.72 0.93 1.00 0.53 0.73 0.95 1.00 0.54 0.75 1.00 1.00 0.56 0.77 1.00 1.00

8.58 8.55 8.52 8.52 9.62 9.59 9.57 9.57 10.77 10.75 10.73 10.73 12.06 12.03 12.02 12.02 13.46 13.45 13.45 13.45
297 292 288 287 342 337 332 332 391 385 381 381 444 439 435 435 502 497 494 494
158 144 132 130 159 146 134 133 161 148 137 136 163 150 140 140 166 152 143 143

32.25 29.82 27.85 27.82 30.87 28.55 26.81 26.81 29.45 27.20 25.72 25.73 27.98 25.81 24.59 24.60 26.34 24.28 23.35 23.35

0.54 0.74 0.99 1.00 0.55 0.75 1.00 1.00 0.56 0.77 1.00 1.00 0.57 0.79 1.00 1.00 0.58 0.82 1.00 1.00

298 293 289 289 343 338 334 334 392 386 383 383 445 440 437 437 502 498 496 496
161 147 136 136 163 149 139 139 164 151 142 142 166 153 145 145 168 155 149 149

32.50 30.08 28.55 28.55 31.08 28.78 27.50 27.50 29.63 27.41 26.36 26.37 28.13 26.00 25.19 25.19 26.46 24.45 23.89 23.89

0.56 0.77 1.00 1.00 0.57 0.79 1.00 1.00 0.58 0.81 1.00 1.00 0.59 0.84 1.00 1.00 0.61 0.86 1.00 1.00

8.99 8.96 8.94 8.94 10.03 10.00 9.98 9.98 11.18 11.15 11.14 11.14 12.46 12.44 12.43 12.43 13.86 13.85 13.85 13.85
299 294 291 291 344 339 336 336 393 387 385 385 446 441 439 439 503 498 497 497
163 150 141 141 165 151 144 144 167 153 147 147 169 155 150 150 171 157 154 154

TECHNICAL SUPPORT MANUAL Split System Air Conditioner: R4A3, WCA3**4

Sensible Capacity at Indoor db LOWER than 80 ° F = ( MBh x S/T ) −

Sensible Capacity at Indoor db HIGHER than 80 ° F = ( MBh x S/T ) +

( 80 − Indoor db ) x 835 x Indoor CFM

(

( Indoor db − 80 ) x 835 x Indoor CFM

(

1000

1000

)
)