Lennox 10ACC-018 - System Operation; Maintenance; Outdoor Coil; Indoor Coil

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Table 7
Normal Operating Pressures In psig (liquid and vapor +/− 2 psig)*
Unit /
Metering
Out. Coil
Enterin
g
−018 −024 −030 −036 −042 −048 −060
M
e
t
er
i
ng
Device
Entering
Air Temp.
5F (5C)
LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC.
65 (18.3) 153 71 163 70 175 76 162 70 173 73 159 71 170 74
75 (23.9) 180 72 193 71 206 77 187 74 201 74 188 72 201 76
10ACC /
85 (29.4) 209 73 225 72 241 78 219 75 234 74 220 73 234 77
10ACC /
TXV
95 (35.0) 240 77 260 73 277 80 253 77 269 75 251 76 270 79
TXV
105 (40.6) 274 79 298 74 316 81 291 79 307 76 290 77 309 79
110 (43) 292 80 318 75 336 82 310 80 326 77 309 78 331 80
115 (45) 311 81 338 75 357 83 329 81 346 78 328 79 351 81
65 (18.3) 155 62 165 63 181 69 168 67 178 67 163 68 189 72
75 (23.9) 182 68 194 67 211 73 195 71 202 70 190 71 203 74
85 (29.4) 211 72 224 70 242 76 224 75 235 71 220 74 233 77
10ACC /
fixed orifice
95 (35.0) 242 77 257 73 276 79 255 78 270 74 251 77 265 79
fixed
orifice
105 (40.6) 274 80 293 76 313 81 289 82 308 78 288 79 301 82
110 (43) 291 81 313 78 332 82 305 83 326 79 307 80 319 83
115 (45) 308 83 332 79 353 84 324 84 347 80 325 82 339 84
*These are typical pressures only. Indoor indoor match up, indoor air quality, and indoor load will cause the pressures to vary.
System Operation
The outdoor unit and indoor blower cycle on demand from
the room thermostat. When the thermostat blower switch is
in the ON position, the indoor blower operates continuously.
Maintenance
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each cooling
season, the system should be checked as follows:
WARNING
Electric shock hazard. Can cause inju-
ry or death. Before attempting to per-
form any service or maintenance, turn
the electrical power to unit OFF at dis-
connect switch(es). Unit may have
multiple power supplies.
1 − Clean and inspect the outdoor coil. The coil may be
flushed with a water hose. Make sure power is off be-
fore cleaning.
2 − Condenser fan motor is prelubricated and sealed. No
further lubrication is needed.
3 − Visually inspect connecting lines and coils for evidence
of oil leaks.
4 − Check wiring for loose connections.
5 − Check for correct voltage at unit (unit operating).
6 − Check amp−draw condenser fan motor.
Unit nameplate _________ Actual ____________ .
NOTE − If the owner complains of insufficient cooling,
the unit should be gauged and the refrigerant charge
should be checked. Refer to the charging section in
this instruction.
Indoor Coil
1 − Clean coil, if necessary.
2 − Check connecting lines and coils for evidence of oil
leaks.
3 − Check the condensate pan line and clean it if necessary.
Indoor Unit
1 − Clean or change filters.
2 − Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
3 − Belt Drive Blowers − Check belt for wear and proper
tension.
4 − Check all wiring for loose connections
5 − Check for correct voltage at unit (blower operating).
6 − Check amp−draw on blower motor
Unit nameplate_________ Actual ____________.