Page 23
XC13 SERIES
START: Measure outdoor ambient temperature
1. Connect gauge set as illustrated in figure
32.
2. Check Liquid and suction line pressures
3. Compare unit pressures with table 4,
Normal Operating Pressures
.
4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over feet.
Liquid Line
Set Diameter
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3/8" (9.5 mm)
3 ounce per 5’ (85 g per 1.5 m)
NOTE − *If line length is greater than 15 ft.
(4.6 m), add this amount. If line length is
less than 15 ft. (4.6 m), subtract this
amount.
Refrigerant
Charge per Line
Set Length
USE EITHER APPROACH
OR SUBCOOLING
METHOD
This nameplate is for illustration
purposes only. Go to actual
nameplate on outdoor unit for
charge information.
64ºF and
BELOW
65ºF
and
ABOVE
ABOVE or
BELOW
Figure 35. Using HFC−410A Weigh In (TXV) Charge Method
A
Once refrigerant charge is
correct, disconnect gauge set
and replace service port caps.
WEIGH IN TXV
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. Connect gauge set as illustrated in figure 32.
2. Confirm proper airflow across coil using figure 33.
3. Compare unit pressures with table 4,
Normal
Operating Pressures
.
4. Set thermostat to call for heat (must have a cooling
load between 70-80ºF (21−26ºC).
5. When heat demand is satisfied, set thermostat to call
for 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 36. Using HFC−410A Approach (TXV) Charge Method
64ºF and
BELOW
65ºF
and
ABOVE
ABOVE or
BELOW
B
ºF (ºC)*
−018
−024
−030
−036
−042
−048
−060
Any
4 (2.2)
8 (4.4)
8 (4.4)
11 (6.1)
7 (3.9)
8 (4.4)
9 (5.0)
*Temperature of air entering outdoor coil
APPROACH TXV
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.
