Page 19
XC16 SERIES
DO NOT CHARGE UNIT
(Results of charging at low
temperatures not reliable)
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant
based upon line length
APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])
1. Confirm proper airflow across coil using figure
28.
2. Compare unit pressures with Table 2, Normal
Operating Pressures − Second Stage (High
Capacity).
3. Set thermostat to call for heat (must have a
cooling load between 70-80ºF (21−26ºC).
4. Connect gauge set.
5. When heat demand is satisfied, set thermostat
to call for second stage (high capacity) cooling.
6. Allow temperatures and pressures to stabilize.
7. Record outdoor ambient temperature:
AMBº =_________
8. Record liquid line temperature:
LIQº = __________
9. Subtract to determine approach (APPº):
LIQº_____ − AMBº _____ = APPº_____
10. Compare results with table below.
Figure 32. Approach TXV Charge Second Stage (High Capacity)
64ºF and
BELOW
65ºF
and
ABOVE
ABOVE or
BELOW
Models
ºF (ºC)* −024 −036 −048 −060
Any 6 (3.3) 6 (3.3) 8 (4.4) 4 (2.2)
*Temperature of air entering outdoor coil
Second Stage (High Capacity)
If value is greater than shown (high approach),
add refrigerant; if less than shown (liquid
temperature too close to ambient temperature,
low approach), remove refrigerant.
If refrigerant is added
or removed, retest to
confirm that unit is
properly charged.
Table 2. Normal Operating Pressures In PSIG (Liquid +/− 10 and Suction+/− 5 PSIG)*
IMPORTANT
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.
Temp. of air
entering
outdoor coil
5F (5C)
−024 −036 −048 −060
Liquid Suction Liquid Suction Liquid Suction Liquid Suction
First Stage (Low Capacity)
65 (18.3) 215 144 226 142 224 142 215 136
75 (23.9) 247 146 261 144 258 144 250 139
85 (29.4) 288 148 304 145 299 146 291 142
95 (35.0) 332 151 352 147 345 148 337 144
105 (40.6) 381 153 405 150 395 150 388 146
115 (46.1) 435 155 460 150 450 153 444 148
Second Stage (High Capacity)
65 (18.3) 225 140 228 144 235 135 220 130
75 (23.9) 258 142 262 146 269 137 256 133
85 (29.4) 301 144 306 148 313 139 299 136
95 (35.0) 346 146 353 150 361 141 347 138
105 (40.6) 397 149 405 151 412 143 402 141
115 (46.1) 452 151 462 154 471 146 462 143
*These are typical pressures only. Indoor indoor match up, indoor air quality, and indoor load will cause the pressures to vary.
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