System Operation; Maintenance - Lennox Merit Series13ACD Installation Instructions Manual

Table 6. HCFC−22 Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
13ACD −018
5F (5C)*
Liquid / Suction
Expansion Valve (TXV)
65 (18) 138 / 79
70 (21) 148 / 80
75 (24) 160 / 80
80 (27) 174 / 81
85 (29) 188 / 81
90 (32) 204 / 81
95 (35) 219 / 82
100 (38) 236 / 82
105 (41) 253 / 83
110 (43) 272 / 84
115 (45) 291 / 84
Fixed Orifice (RFC)
65 (18) 139 / 67
70 (21) 149 / 70
75 (24) 161 /74
80 (27) 175 / 77
85 (29) 189 / 79
90 (32) 203 / 81
95 (35) 218 / 82
100 (38) 234 / 83
105 (41) 251 / 85
110 (43) 269 / 86
115 (45) 287 / 87
INSTALLING SERVICE VALVE CAPS
Disconnect gauge set and re−install both the liquid and
suction service valve caps.
OUTDOOR UNIT
SERVICE VALVES
Figure 33. Installing Service Valve Caps

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.
505366M 01/08
Use this table to perform maintenance checks; it is not a procedure for
charging the system. Minor variations in these pressures may be due to
differences in installations. Significant deviations could mean that the system
is not properly charged or that a problem exists with some component in the
system.
−024 −030
Liquid / Suction Liquid / Suction
148 / 79 147 / 75
160 / 79 159 / 75
174 / 80 172 / 76
188 / 81 186 / 77
203 / 81 201 / 77
220 / 82 216 / 78
236 / 83 233 / 79
253 / 83 250 / 80
272 / 84 268 / 80
291 / 85 287 / 81
311 / 85 306 / 82
147 / 71 148 / 65
159 / 73 161 / 67
172 / 75 175 / 70
186 / 77 190 / 73
200 / 79 205 / 75
216 / 81 221 / 77
232 / 82 237 / 79
247 / 83 254 / 80
264 / 85 271 / 81
285 / 86 289 / 82
302 / 87 308 / 83
INSTALL CAPS
−036 −042
Liquid / Suction Liquid / Suction
155 / 79 147 / 78
169 / 80 158 / 78
183 / 81 172 / 79
199 / 81 189 / 79
215 / 82 205 / 80
233 / 82 222 / 81
252 / 83 241 / 81
271 / 83 259 / 82
291 / 84 279 / 82
311 / 85 299 / 83
331 / 86 320 / 84
162 / 75 158 / 72
174 / 76 170 / 75
187 / 78 182 / 76
201 / 79 195 / 78
215 / 81 209 / 80
231 / 82 224 / 81
247 / 83 240 / 82
265 / 84 256 / 84
283 / 85 273 / 85
302 / 86 290 / 86
321 / 87 310 / 87

Maintenance

Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
Improper installation,
service or maintenance can cause personal injury,
loss of life, or damage to property.
Installation and service must be performed by a
licensed professional installer (or equivalent) or a
service agency.
Page 18
−048
Liquid / Suction Liquid / Suction
144 / 77
152 / 77
163 / 78
179 / 78
195 / 79
212 / 80
229 / 80
245 / 81
265 / 81
287 / 82
309 / 83
151 / 71
161 / 73
172 / 75
185 / 76
198 / 77
213 / 79
227 / 80
243 / 81
259 / 82
276 / 84
293 / 85
WARNING
WARNING
adjustment,
−060
152 / 73
164 / 75
177 / 77
192 / 78
208 / 79
225 / 80
243 / 80
261 / 81
280 / 82
299 / 83
320 / 83
152 / 68
165 / 71
178 / 73
193 / 76
208 / 78
224 / 80
239 / 81
258 / 82
276 / 83
294 / 85
313 / 86
alteration,