Page 15
Revised 05−2009
TPA*S4
Table 8. Adding Charge per Indoor Unit Matchup using Subcooling Method
Use
cooling
mode
Use
heating
mode
1. Check the airflow (figure 15, Page 13) to be sure the indoor airflow is as required. (Make any air
flow adjustments before continuing with the following procedure.)
2. Measure outdoor ambient temperature; determine whether to use
cooling
mode
or
heating mode
to check charge.
3. Connect gauge set.
4. Check Liquid and Vapor line pressures. Compare pressures with Normal Operating Pressures table
4, (
Table 4 is a general guide. Expect minor pressures variations. Significant differences may mean
improper charge or other system problem.
)
5. Set thermostat for heat/cool demand, depending on mode being used:
Using cooling mode
When the outdoor ambient temperature is 60°F (15°C) and above. Target
subcooling values in table below are based on 70 to 80°F (21−27°C) indoor return air temperature; if
necessary, operate heating to reach that temperature range; then set thermostat to cooling mode
setpoint to 68ºF (20ºC). When pressures have stabilized, continue with step 6..
Using heating mode
When the outdoor ambient temperature is below 60°F (15°C). Target
subcooling values in table below are based on 65−75°F (18−24°C) indoor return air temperature; if
necessary, operate cooling to reach that temperature range; then set thermostat to heating mode
setpoint to 77ºF (25ºC). When pressures have stabilized, continue with step 6..
6. Read the liquid line temperature; record in the LIQº space.
7. Read the liquid line pressure; then find its corresponding temperature in the temperature/ pressure
table 13 and record it in the SATº space.
8. Subtract LIQº temp. from SATº temp. to determine subcooling; record it in SCº space.
9. Compare SCº results with table below, being sure to note any additional charge for line set and/or
matchup.
10. If subcooling value is greater than shown in table, remove refrigerant; if less than shown, add
refrigerant.
11. If refrigerant is added or removed, repeat steps 5. through 10. to verify charge.
60ºF (15ºC)
SATº
LIQº
–
SCº
=
D − Indoor Unit Matchups TPA*S4N43Y
Table 9. TPA036S4N43Y
INDOOR MATCHUPS
Target
Subcooling
Heat
Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF)
lb
oz
CBX26UH−036
17
10
2
7
CBX27UH−036−230
10
5
2
7
CBX27UH−042−230
10
10
2
13
CBX32M−036, −042
10
5
2
7
CBX32MV−036−230
10
5
2
7
CBX40UHV−036
10
5
2
7
CH33−31A, −31B
10
5
2
8
CH33−36B
10
5
0
0
CH33−36C
10
5
0
5
CH33−42
10
5
2
8
CH33−44/48B
10
5
2
10
CH33−48C
10
5
2
10
CR33−30/36
25
5
0
6
CR33−48
25
5
2
8
CR33−50/60
10
5
2
10
CX34−36B
10
5
0
1
CX34−38 SN# 6007 and after
5
5
2
7
CX34−38 before SN# 6007
10
5
2
7
CX34−42B
10
5
0
1
CX34−44/48B
10
5
2
7
Table 10. TPA042S4N43Y
INDOOR MATCHUPS
Target
Subcooling
Heat
Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF)
lb
oz
CBX26UH−042
26
5
1
1
CBX26UH−048
10
12
4
5
CBX27UH−042−230
10
6
4
5
CBX27UH−048−230
10
6
4
5
CBX32M−036, −042
15
5
0
0
CBX32MV−036
15
5
0
0
CBX32MV−048−230
10
6
4
5
CBX40UHV−036
15
5
0
0
CBX40UHV−042, −048
10
6
4
5
CH33−43C, −48C
10
6
1
1
CH33−49C, −50/60C
10
6
4
5
CH33−60D
10
6
2
6
CR33−48
32
5
0
5
CR33−50/60
32
9
2
6
CR33−60
32
9
2
6
CX34−43C
10
6
1
1
CX34−49
10
6
3
7
CX34−50/60C
10
6
1
1
