Lennox XP14 SERIES Unit Information page 19

Use
cooling
mode
60ºF (15ºC)
Use
heating
mode
SATº
LIQº –
SCº =
Subcool Target
INDOOR HEAT
Cooling Heating
MATCH−UP PUMP
(+5ºF) (+1ºF)
XP14−018
CBX27UH−018/024 13
CBX32MV−018/024 15
XP14−024
CH23−41 16
CBX26UH−024 25
CBX27UH−018/024 15
CBX32M−018/024 16
CBX32M−030 15
CBX32MV−018/024 16
CBX32MV−024/030 15
CH33−42B 14
CH33−36A 16
CH33−36C 16
CR33−30/36A/B/C 25
CX34−25A/B 16
CX34−31A/B 15
CX34−36A/B/C 16
CX34−38A/B 14
XP14−030
CH23−41 11
CH23−51 6
CBX26UH−024 30
CBX26UH−030 29
CBX27UH−030 11
CBX32M−030 11
CBX32M−036 11
CBX32MV−024/030 11
CBX32MV−036 11
C33−44C 11
CH33−36C 11
CH33−42B 6
CR33−30/36A/B/C 30
*Add charge = Extra match−up amount required in addition to charge indicated on Heat Pump nameplate (remember to also add any charge required for line set differ-
ences from 15 feet).
Adding Charge per Indoor Unit Match using Subcooling Method
1 Check the airflow as illustrated in figure20 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 5, (Table 5 is a general guide. Expect minor pressure variations.
Significant differences may mean improper charge or other system problem.)
5 Set thermostat for heat/cool demand, depending on mode being used:
When the outdoor ambient temperature is 60°F (15°C) and above.
Using cooling mode
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.
When the outdoor ambient temperature is below 60°F (15°C).
Using heating mode
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 chart listed on page 20 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 match−up.
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.
*Add INDOOR
charge MATCH−UP
lb oz XP14−030 (cont'd)
7 0 8 CX34−31A/B
7 0 0 CX34−38A/B
lb oz
CX34−43B/C
XP14−036
8 0 2
7 0 0 CBX26UH−036
8 1 2 CBX26UH−037
8 0 14 CBX27UH−036
8 1 3 CBX32M−036
8 0 14 CBX32M−042
8 1 2 CBX32MV−036
11 1 10 CBX32MV−048
8 1 0 C33−44C
8 0 4 CH33−50/60C
7 0 2 CH33−44B
8 0 14 CH33−48B
8 1 3 CR33−50/60C
8 1 8 CR33−48B/C
11 2 2 CX34−49C
lb oz
CX34−43B/C, −50/60C
6 0 8 CX34−38A/B, −44/48C
XP14−042
6 1 12
8 0 6 CH23−68
8 2 3 CBX26UH−042
6 2 4 CBX27UH−042
6 1 6 CBX32M−048
6 2 4 CBX32MV−048
6 1 6 CH33−62D
6 2 4 CH33−50/60C
6 2 3 CH33−60D
3 0 0 CR33−50/60C,−60D
6 1 12 CBX33−042,−048
8 0 8 CBX33−060
TABLE 7
Subcool Target
HEAT *Add
Cooling Heating
PUMP charge
(+5ºF) (+1ºF)
lb oz
11 6 1 6
11 6 2 3
15 11 2 14
lb oz
26 5 0 0
25 4 1 9
13 6 0 3
13 6 0 2
13 6 0 3
13 6 0 3
11 8 2 5
13 6 0 0
11 8 2 5
13 6 1 7
13 6 1 8
25 4 1 15
25 5 0 9
13 6 2 4
13 6 1 8
13 6 0 0
lb oz
20 9 0 13
27 6 0 0
12 6 0 8
12 6 0 7
12 6 0 8
12 6 0 10
12 6 0 7
12 6 0 4
26 6 0 4
12 7 0 4
12 6 0 7
Page 19
Subcool Target
INDOOR HEAT
Cooling Heating
MATCH−UP PUMP
(+5ºF) (+1ºF)
XP14−042 (cont'd)
CX34−62C, −62D 12
CX34−49C 12
CX34−60D 12
XP14−048
CH23−68 20
CBX26UH−048 8
CBX27UH−048 11
CBX32M−048, −060 11
CBX32MV−048, −060 11
CBX32MV−068 10
CH33−50/60C 11
CH33−62D 10
CH33−60D 11
CR33−50/60C 35
CR33−60D 37
CBX33−048, −060 12
CX34−62C, −62D 10
CX34−49D 11
CX34−60D 11
XP14−060
CH23−68 12
CBX26UH−048 12
CBX26UH−060 14
CBX27UH−060 12
CBX32M−048, −060 12
CBX32MV−048, −060 12
CBX32MV−068 12
CH33−50/60C 12
CH33−62D 12
CBX33−060 12
CX34−62C, −62D 12
*Add
charge
lb oz
6 0 9
6 0 7
6 0 4
lb oz
9 2 9
7 1 9
8 1 2
8 1 2
8 1 2
7 1 12
8 1 1
7 1 14
8 0 0
5 0 0
6 0 0
8 1 2
7 1 7
8 0 14
8 0 0
lb oz
5 0 0
7 1 0
4 0 0
5 0 0
5 0 0
5 0 0
7 1 0
5 0 0
5 0 0
8 0 0
7 1 0