7
Voltage Ports
NOTE: The communicating thermostat is able to search and iden-
tify the indoor and outdoor units when power is applied to the
system. Refer to the communicating thermostat’s installation
instruction manual for more information.
Connect low voltage communication wires (1, 2) to low voltage
pigtail provided.
THERMOSTAT WIRING
NOTE: A removable plug connector is provided with the control
to make thermostat wire connections. This plug may be removed,
wire connections made to the plug, and replaced. It is STRONGLY
recommended that you do not connect multiple wires into a
single terminal without mechanically twisting the tips together
with a set of pliers. Failure to do so may result in intermittent
operation.
Typical 18 AWG thermostat wire may be used to wire the sys-
tem components. However, communications reliability may be
improved by using a high quality, shielded, twisted pair cable for
the data transmission lines. In either case, 250 feet is the maxi-
mum length of wire between indoor unit and outdoor unit, or
between indoor unit and thermostat.
TWO-WIRE OUTDOOR, FOUR-WIRE INDOOR WIRING
Low voltage wiring consists of two wires between the indoor
unit and outdoor unit and four wires between the indoor unit
and thermostat. The required wires are data lines 1 and 2, “R”
(24 VAC hot) and “C” (24 VAC common).
12RC
12RC
CTK04
Thermostat
Compatible
ir Handler/Furnace
Integrated Control Module
Compatible AC/HP
Integrated Control Module
12RC
System Wiring
STEP 1. CALCULATE REFRIGERANT CHARGE BASED ON LINE
SET LENGTH
The heat pump unit is shipped with a predetermined factory
charge level as shown below. For longer line sets greater than
15 feet, add 0.6 ounces of refrigerant per foot.
NOTICE
T
OTAL
R
EFRIGERANT
=
F
ACTORY
C
HARGE
+ (0.6
OZ
./
FT
. * A
DDITIONAL
F
EET
OF
A
CTUAL
L
INE
S
ET
).
The following table shows refrigerant amounts for every 5 feet of
line.
15 (Factory Charge) 165 272 272 242
20 168 275 275 245
25 171 278 278 248
30 174 281 281 251
35 177 284 284 254
40 180 287 287 257
45 183 290 290 260
50 186 293 293 263
55 189 296 296 266
60 192 299 299 269
65 195 302 302 272
70 198 305 305 275
75 201 308 308 278
80 204 311 311 281
85 207 314 314 284
90 210 317 317 287
95 213 320 320 290
100 216 323 323 293
105 219 326 326 296
110 222 329 329 299
115 225 332 332 302
120 228 335 335 305
125 231 338 338 308
130 234 341 341 311
135 237 344 344 314
140 240 347 347 317
145 243 350 350 320
150 246 353 353 323
155 249 356 356 326
160 252 359 359 329
165 255 362 362 332
170 258 365 365 335
175 261 368 368 338
180 264 371 371 341
185 267 374 374 344
190 270 377 377 347
195 273 380 380 350
200 276 383 383 353
Unit Tonnage
Actual Line Set Length
(ft.)
2-Ton 3-Ton 4-Ton 5-Ton
Refrigerant (Oz.)
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