Page 12
Revised 05−2009
TPA*S4
IMPORTANT
Use table 4 as a general guide when performing
maintenance checks. This is not a procedure for
charging the unit (Refer to Charging / Checking
Charge section). Minor variations in these pressures
may be expected due to differences in installations.
Significant differences could mean that the system
is not properly charged or that a problem exists with
some component in the system.
4.. Use the same digital thermometer used to check
outdoor ambient temperature to check liquid line
temperature. Verify the unit charge using the approach
method.
5.. The difference between the ambient and liquid
temperatures should match the approach values given
in table 5. If the values do not agree with the those in
table 5, add refrigerant to lower the approach
temperature or recover refrigerant from the system to
increase the approach temperature.
TABLE 4
TPA*S4N41Y through TPA*S4N42Y
Normal Operating Pressures
1
MODEL
TPA036S4N4
1
TPA042S4N4
1
TPA048S4N4
1
TPA060S4N4
1
5
F(
5
C)
2
Liquid/Vapor
Liquid/Vapor
Liquid/Vapor
Liquid/Vapor
Cooling Pressures
3
65 (18)
260 / 136
231 / 135
246 / 134
256 / 116
75 (24)
303 / 140
267 / 138
286 / 136
298 / 123
85 (29)
348 / 143
314 / 140
330 / 138
345 / 131
95 (35)
398 / 145
367 / 143
379 / 140
395 / 135
105 (41)
452 / 148
414 / 146
432 / 143
450 / 138
115 (45)
512 / 151
473 / 148
492 / 146
512 / 141
Heating Pressures
3
60 (15)
350 / 131
360 / 135
361 / 130
370 / 127
50 (10)
331 / 107
340 / 110
334 / 100
350 / 102
40 (4)
314 / 88
324 / 91
302 / 92
331 / 81
30 (−1)
290 / 74
307 / 73
300 / 73
309 / 62
20 (−7)
283 / 58
298 / 61
286 / 60
300 / 56
1
These are most−popular−match−up pressures. Indoor match up,
indoor air quality, and indoor load cause pressures to vary.
2
Temperature of the air entering the outdoor coil.
3
Liquid ±10 and Vapor ±5 psig.
TABLE 5
TPA*S4N41Y through TPA*S4N42Y
TPA036S4 Approach Values for Charging
_
Liquid Line Temperature
_
Outdoor Temperature
=
_
Approach Temperature
Model
−036
−042
−048
−060
°F (°C)*
13 (7.2)
9 (5)
6 (3.3)
9 (5)
NOTE − For best results, use the same electronic thermometer to
check both outdoor-ambient and liquid-line temperatures.
*F: +/−1.0°; C: +/−0.5°
D − Charging TPA*S4N43Y
This system is charged with HFC−410A refrigerant which
operates at much higher pressures than HCFC−22. The
recommended check expansion valve is approved for use
with HFC−410A. Do not replace it with a valve that is
designed to be used with HCFC−22. This unit is NOT
approved for use with coils that include metering orifices or
capillary tubes.
The unit is factory−charged with the amount of HFC−410A
refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with a 15
foot (4.6 m) line set.
For varying line set lengths and for
various indoor unit matchups, the refrigerant charge
must be adjusted per tables
6 (Page 14) and 8
(Page 15).
A blank space is provided on the unit rating
plate to list the actual field charge.
IMPORTANT
Mineral oils are not compatible with HFC−410A. If oil
must be added, it must be a polyol ester oil.
Check Indoor Airflow before Charging
IMPORTANT
CHECK AIRFLOW BEFORE CHARGING!
NOTE − Be sure that filters and indoor and outdoor coils are
clean before testing.