Lennox XP14 SERIES User Manual

Page 19
TABLE 7
Adding Charge per Indoor Unit Match using Subcooling Method
Use
cooling
mode
Use
heating
mode
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:
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 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.
60ºF (15ºC)
SATº
LIQº –
SCº =
INDOOR HEAT
MATCH−UP PUMP
Subcool Target
Cooling Heating
(+
5ºF) (+1ºF)
*Add
charge
INDOOR HEAT
MATCH−UP PUMP
Subcool Target
Cooling Heating
(+
5ºF) (+1ºF)
*Add
charge
INDOOR HEAT
MATCH−UP PUMP
Subcool Target
Cooling Heating
(+
5ºF) (+1ºF)
*Add
charge
XP14−018 lb oz XP14−030 (cont’d) lb oz XP14−042 (cont’d) lb oz
CBX27UH−018/024 13 7 0 8 CX34−31A/B 11 6 1 6 CX34−62C, −62D 12 6 0 9
CBX32MV−018/024 15 7 0 0 CX34−38A/B 11 6 2 3 CX34−49C 12 6 0 7
XP14−024 lb oz
CX34−43B/C 15 11 2 14 CX34−60D 12 6 0 4
CH23−41 16 8 0 2
XP14−036 lb oz XP14−048 lb oz
CBX26UH−024 25 7 0 0 CBX26UH−036 26 5 0 0 CH23−68 20 9 2 9
CBX27UH−018/024 15 8 1 2 CBX26UH−037 25 4 1 9 CBX26UH−048 8 7 1 9
CBX32M−018/024 16 8 0 14 CBX27UH−036 13 6 0 3 CBX27UH−048 11 8 1 2
CBX32M−030 15 8 1 3 CBX32M−036 13 6 0 2 CBX32M−048, −060 11 8 1 2
CBX32MV−018/024 16 8 0 14 CBX32M−042 13 6 0 3 CBX32MV−048, −060 11 8 1 2
CBX32MV−024/030 15 8 1 2 CBX32MV−036 13 6 0 3 CBX32MV−068 10 7 1 12
CH33−42B 14 11 1 10 CBX32MV−048 11 8 2 5 CH33−50/60C 11 8 1 1
CH33−36A 16 8 1 0 C33−44C 13 6 0 0 CH33−62D 10 7 1 14
CH33−36C 16 8 0 4 CH33−50/60C 11 8 2 5 CH33−60D 11 8 0 0
CR33−30/36A/B/C 25 7 0 2 CH33−44B 13 6 1 7 CR33−50/60C 35 5 0 0
CX34−25A/B 16 8 0 14 CH33−48B 13 6 1 8 CR33−60D 37 6 0 0
CX34−31A/B 15 8 1 3 CR33−50/60C 25 4 1 15 CBX33−048, −060 12 8 1 2
CX34−36A/B/C 16 8 1 8 CR33−48B/C 25 5 0 9 CX34−62C, −62D 10 7 1 7
CX34−38A/B 14 11 2 2 CX34−49C 13 6 2 4 CX34−49D 11 8 0 14
XP14−030 lb oz
CX34−43B/C, −50/60C 13 6 1 8 CX34−60D 11 8 0 0
CH23−41 11 6 0 8 CX34−38A/B, −44/48C 13 6 0 0
XP14−060 lb oz
CH23−51 6 6 1 12
XP14−042 lb oz
CH23−68 12 5 0 0
CBX26UH−024 30 8 0 6 CH23−68 20 9 0 13 CBX26UH−048 12 7 1 0
CBX26UH−030 29 8 2 3 CBX26UH−042 27 6 0 0 CBX26UH−060 14 4 0 0
CBX27UH−030 11 6 2 4 CBX27UH−042 12 6 0 8 CBX27UH−060 12 5 0 0
CBX32M−030 11 6 1 6 CBX32M−048 12 6 0 7 CBX32M−048, −060 12 5 0 0
CBX32M−036 11 6 2 4 CBX32MV−048 12 6 0 8 CBX32MV−048, −060 12 5 0 0
CBX32MV−024/030 11 6 1 6 CH33−62D 12 6 0 10 CBX32MV−068 12 7 1 0
CBX32MV−036 11 6 2 4 CH33−50/60C 12 6 0 7 CH33−50/60C 12 5 0 0
C33−44C 11 6 2 3 CH33−60D 12 6 0 4 CH33−62D 12 5 0 0
CH33−36C 11 3 0 0 CR33−50/60C,−60D 26 6 0 4 CBX33−060 12 8 0 0
CH33−42B 6 6 1 12 CBX33−042,−048 12 7 0 4 CX34−62C, −62D 12 7 1 0
CR33−30/36A/B/C 30 8 0 8 CBX33−060 12 6 0 7
*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).

Lennox XP14 SERIES Specifications

General

Brand	Lennox
Model	XP14 SERIES
Category	Heat Pump
Language	English