Page 16
505361M 09/07
CHARGE USING THE APPROACH METHOD −
OUTDOOR TEMPERATURE > 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 listed in table
9. 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.
4. Use the same digital thermometer used to check
outdoor ambient temperature to check liquid line
temperature. Verify the unit charge using the approach
method.
5. The difference between the ambient and liquid
temperatures should match the approach values listed
in table 8. If the values do not agree with the those
listed in table 8, add refrigerant to lower the approach
temperature or recover refrigerant from the system to
increase the approach temperature.
Table 8. Approach Values
º
Liquid Line Temperature
º
F (
º
C)
º
Outdoor Temperature
º
F (
º
C)
=
º
Approach Temperature
º
F (
º
C)
Model
−018
−024
−030
−036
−042
−048
−060
°F
(°C)*
7
(3.9)
8
(4.4)
9 (5)
13
(7.2)
7
(3.9)
9 (5)
7
(3.9)
NOTE − For best results, use the same electronic thermome-
ter to check both outdoor-ambient and liquid-line tempera-
tures. *F: + / −1.0°; C: + / −0.5°
INSTALLING SERVICE VALVE CAPS
Disconnect gauge set and re−install all service valve caps.
INSTALL CAPS
OUTDOOR UNIT
SERVICE VALVE
Figure 26. Installing Service Valve Port Caps
Table 9. Normal Operating Pressure − 10 and Vapor +5 PSIG*
IMPORTANT
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.
Model
13HPD−018
13HPD−024
13HPD−030
13HPD−036
13HPD−042
13HPD−048
13HPD−060
Temp.
5
F (
5
C)**
Liquid / Vapor
Liquid / Vapor
Liquid / Vapor
Liquid / Vapor
Liquid / Vapor
Liquid / Vapor
Liquid / Vapor
Cooling
65 (18)
141 / 81
148 / 80
146 / 78
154 / 78
139 / 67
146 / 75
145 / 72
75 (24)
163 / 82
176 / 82
171 / 79
180 / 80
163 / 74
171 / 77
171 / 75
85 (29)
191 / 84
206 / 83
201 / 80
216 / 81
191 / 81
198 / 78
199 / 77
95 (35)
222 / 85
240 / 84
233 / 81
246 / 81
220 / 84
229 / 79
230 / 78
105 (41)
256 / 87
277 / 86
271 / 81
284 / 82
256 / 85
268 / 81
266 / 79
115 (45)
296 / 89
322 / 87
313 / 83
328 / 85
294 / 87
308 / 81
304 / 81
Heating
50(10)
192 / 64
185 / 60
198 / 58
196 / 58
204 / 59
197 / 39
212 / 57
40 (4)
180 / 53
176 / 50
188 / 47
185 / 47
195 / 49
189 / 31
200 / 47
30 (−1)
172 / 43
165 / 49
175 / 35
176 / 37
184 / 39
181 / 25
187 / 38
20 (−7)
164 / 34
162 / 31
163 / 26
170 / 30
178 / 32
175 / 18
174 / 34
*These are most−popular−match−up pressures. Indoor match up, indoor air quality, and indoor load cause pressures to vary.
**Temperature of the air entering the outside coil.
