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5 − Compare the subcooling value with those in table 5. If
subcooling is greater than shown, recover some refrig-
erant. If subcooling is less than shown, add some re-
frigerant.
Table 5
Subcooling Values
Model
Subcooling Temp. _F (_C)
10HPB18 5 (2.8)
10HPB24 7 (3.9)
10HPB30 9 (5)
10HPB36 11 (6.1)
10HPB42 7 (3.9)
10HPB48 8 (4.4)
10HPB60 10 (5.6)
Charging Using Normal Operating Pressures
and the Approach Method
Outdoor Temp. >
65_F (18_C)
The following procedure is intended as a general guide and
is for use on expansion valve systems only. For best results,
indoor temperature should be 70°F (21°C) to 80°F (26°C).
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 6, Normal Operating Pressures." Minor varia-
tions in these pressures may be expected due to differ-
ences 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.
Table 6
Normal Operating Pressures
Outdoor
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