Important - Lennox ML14KC1 Series Unit Information

FOR COMPLETE CHARGING PROCEDURES, REFER TO THE APPLICABLE INSTALLATION AND SERVICE MANUAL AVAILABLE ONLINE
Capacity -018
°F(°C)²
65 (18) 211 / 131 213 / 127
75 (24) 243 / 133 246 / 130
85 (29) 283 / 135 286 / 132
95 (35) 326 / 138 331 / 134
105 (41) 374 / 139 381 / 136
115 (46) 426 / 141 435 / 138
°F(°C)²
65 (18) 3 (-16.1) 3 (-16.1)
75 (24) 4 (-15.6) 4 (-15.6)
85 (29) 4 (-15.6) 4 (-15.6)
95 (35) 5 (-15.0) 4 (-15.6)
105 (41) 4 (-15.6) 4 (-15.6)
115 (46) 3 (-16.1) 4 (-15.6)
°F(°C)²
65 (18) 9 (-12.8) 9 (-12.8)
75 (24) 6 (-14.4) 7 (-13.9)
85 (29) 7 (-13.9) 7 (-13.9)
95 (35) 6 (-14.4) 7 (-13.9)
105 (41) 7 (-13.9) 8 (-13.3)
115 (46) 7 (-13.9) 8 (-13.3)
¹ Typical pressures; indoor evaporator match-up, indoor air quantity and evapo-
rator load will cause the pressures to vary.
² Temperature of air entering outside coil.

IMPORTANT !

R-454B is a zeotropic blend. Use saturated liquid temperature to calculate
liquid subcooling. Charge unit with liquid only.
AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored for
proper system set-up. It may be necessary to alternately check and adjust the
airflow and the refrigerant charge.
NOTE – Be sure that filters and indoor and outdoor coils are clean before testing.
To determine temperature drop across indoor coil (Delta-T), measure the en-
tering air dry bulb (DB) and wet bulb (WB) temperatures at the indoor coil. Find
Delta-T in table 4. Measure coil's leaving air DB and subtract that value from
entering air DB. The measured difference should be within ±3ºF (±1.8ºC) of table
value; if too low, decrease the indoor fan speed (refer to indoor unit for informa-
tion). If the Delta-T is too high, increase the indoor fan speed. Repeat charging
procedure and Delta-T (air flow adjustment) procedure until both are correct.
Motor Winding Resistance Ω
Unit Model Number
ML14KC1-018-230A01
ML14KC1-024-230A01
ML14KC1-030-230A01
ML14KC1-036-230A01
ML14KC1-041-230A01
ML14KC1-042-230A01
ML14KC1-047-230A01
ML14KC1-048-230A01
ML14KC1-059-230A01
ML14KC1-060-230A01
ML14KC1 Charging Procedures
AIR CONDITIONER CHARGING INFORMATION – R-454B
-024 -030 -036
Table 1. Normal Operating Pressures¹ – TXV System – Liquid ( ± 10 psig) / Suction ( ± 5 psig)
210 / 123 217 / 116
242 / 127 251 / 124
283 / 129 292 / 128
326 / 131 336 / 133
375 / 133 384 / 136
427 / 135 436 / 138
Table 2. Approach (APP) Values³ – TXV System – ºF(ºC) ± 1ºF (0.5ºC)
1 (-17.2) 1 (-17.2)
3 (-16.1) 2 (-16.7)
4 (-15.6) 3 (-16.1)
4 (-15.6) 4 (-15.6)
4 (-15.6) 5 (-15.0)
4 (-15.6) 6 (-14.4)
Table 3. Subcooling (SC) Values⁴ – TXV System – ºF (ºC) ± 1ºF (0.5ºC)
10 (-12.2) 12 (-11.1)
7 (-13.9) 10 (-12.2)
7 (-13.9) 10 (-12.2)
7 (-13.9) 9 (-12.8)
7 (-13.9) 8 (-13.3)
6 (-14.4) 7 (-13.9)
Compressor C-S
YPH014KAA 1.68
YPH020KAA 1.41
YPH025KAA 1.06
YPH031KAA 0.87
YPH034KAA 0.78
YPH036KAA 0.75
YBH039KAA 0.6
YBH042KAA 0.58
YBH049KAA 0.49
YBH051KAA 0.47
-041 -042
213 / 123 214 / 124
246 / 129 247 / 131
286 / 134 287 / 133
330 / 136 330 / 135
378 / 137 378 / 137
431 / 139 431 / 139
1 (-17.2) 2 (-16.7)
3 (-16.1) 5 (-15.0)
4 (-15.6) 5 (-15.0)
4 (-15.6) 5 (-15.0)
4 (-15.6) 5 (-15.0)
4 (-15.6) 5 (-15.0)
11 (-11.7) 10 (-12.2)
9 (-12.8) 7 (-13.9)
7 (-13.9) 6 (-14.4)
7 (-13.9) 7 (-13.9)
7 (-13.9) 7 (-13.9)
7 (-13.9) 6 (-14.4)
³ Approach = Liquid Line Temperature minus Outdoor Ambient Temperature.
⁴ Subcooling = Saturated Liquid Temperature minus Liquid Line Temperature
Example: Assume entering air DB - 72, WB - 64, leaving DB - 53. Therefore, Del-
ta-T should be 15 (per table); delta across coil is 72 - 53 or 19 (which is 4ºF higher
than table value). Action necessary: increase fan speed.
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
Dry bulb
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
temperature
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
of air
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
entering
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
indoor
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
coil (°F)
ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70
[ Wet bulb temperature of air entering indoor coil ]
C-R Unit Model Number
1.21 ML14KC1-018-230A02
1.59 ML14KC1-024-230A02
1.63 ML14KC1-030-230A02
1.3 ML14KC1-036-230A02
1.69 ML14KC1-041-230A02
1.75 ML14KC1-042-230A02
0.71 ML14KC1-047-230A02
0.71 ML14KC1-048-230A02
0.79 ML14KC1-059-230A02
0.78 ML14KC1-060-230A02
Page 38
-047 -048
219 / 122 221 / 113 211 / 120
252 / 126 257 / 122 243 / 125
293 / 133 296 / 126 284 / 126
338 / 136 341 / 130 330 / 128
387 / 138 390 / 132 379 / 131
441 / 140 444 / 133 433 / 133
2 (-16.7) 3 (-16.1) 1 (-17.2)
3 (-16.1) 4 (-15.6) 2 (-16.7)
5 (-15.0) 5 (-15.0) 3 (-16.1)
6 (-14.4) 6 (-14.4) 3 (-16.1)
6 (-14.4) 6 (-14.4) 3 (-16.1)
5 (-15.0) 6 (-14.4) 3 (-16.1)
11 (-11.7) 12 (-11.1) 11 (-11.7)
10 (-12.2) 10 (-12.2) 8 (-13.3)
8 (-13.3) 9 (-12.8) 8 (-13.3)
8 (-13.3) 8 (-13.3) 8 (-13.3)
8 (-13.3) 8 (-13.3) 9 (-12.8)
8 (-13.3) 8 (-13.3) 8 (-13.3)
Table 4. Evaporator Coil Delta-T
Motor Winding Resistance Ω
Compressor
YA14K1E-PFV-ASE
YA20K1E-PFV-ASE
YA25K1E-PFV-ASE
YA31K1E-PFV-ASE
YA34K1E-PFV-ASC
YA36K1E-PFV-ASC
YA40K1E-PFV-ASC
YA42K1E-PFV-ASC
YA49K1E-PFV-ASC
YA51K1E-PFV-ASC
-059 -060
211 / 120
244 / 123
286 / 125
332 / 126
381 / 128
434 / 130
2 (-16.7)
4 (-15.6)
4 (-15.6)
4 (-15.6)
4 (-15.6)
4 (-15.6)
9 (-12.8)
7 (-13.9)
8 (-13.3)
8 (-13.3)
8 (-13.3)
8 (-13.3)
C-R S-R
1.54 1.37
1.26 1.37
0.89 1.57
0.72 1.43
0.57 1.64
0.52 1.6
0.52 1.6
0.46 1.3
0.44 0.8
0.39 0.78