Allied Air Enterprises 4HP16LT - Manual (Page 15)

506468-01 Page 15 Issue 1004
Table 7
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.
4. Use the same digital thermometer to check liquid line
temperature.
Normal Operating Pressures
Heating & Cooling
Cooling Indoor: 80 db; 67 wb
Heating (indoor): 70°F
± 2 psi
L - Liquid S- Suction
Values provided above are for HSV match pressures; different indoor unit match, and indoor load will cause
pressures to vary.