Allied Air 4SCU14LE SERIES Manual de instrucciones de instalación y mantenimiento - Página 14

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_____ °
Saturation Temperature °F
–
_____ °
Liquid Line Temperature °F
=
_____ °
Subcooling Value °F
subcooling.
5. Compare the subcooling value with those shown in Table
6. If subcooling is greater than shown, recover some
refrigerant. If subcooling is less than shown, add some
refrigerant.
Subcooling Values for
TXV Systems
Charge Using Approach Method –
Outdoor Temperatures 65°F or Above
The following procedure is intended as a general guide and
is for use on expansion valve systems only. For best results,
indoor temperature should 70°F to 80°F. Monitor system
pressures while charging.
1. Record outdoor ambient temperature using a digital
thermometer.
2. Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize.
3. Compare stabilized pressures with those provided in
Table 8. 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. Pressures higher than those
listed indicate that the system is overcharged. Pressures
lower than those listed indicate that the system is
undercharged. Verify adjusted charge using the
approach method.
Page 14 of 20
Table 6
4. Use the same digital thermometer to check liquid line
temperature.
5. Subtract the outdoor ambient temperature from the liquid
_____ °
–
_____ °
=
_____ °
line temperature to determine the approach temperature.
6. Compare the approach value with those shown in Table
7. If the values to do not agree with those provided in
Table 7, add refrigerant to lower the approach
temperature or recover refrigerant from the system to
increase the approach temperature.
Approach Values for TXV Systems
Approach value is the liquid line temperature minus the
outdoor ambient temperature (±1°F).
NOTE: For best results, use the same digital thermometer
to check both outdoor ambient and liquid temperatures.
Check Charge Using Normal Operating Pressures
Use Table 8 to perform maintenance checks. Table 8 is not
a procedure for charging the system. Minor variations in
these pressures may be due to differences in installations.
Significant deviations could mean that the system is not
properly charged or that a problem exists with some
component in the system.
Issue 1015
Liquid Line Temperature °F
Outdoor Ambient Temperature °F
Approach Temperature °F
Table 7
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