Lennox CB26UH Series Installation Instructions Manual page 17

,t_2008 Lennox Industries Inc,
Dallas, Texas, USA CB(X)26UH
CHARGE USING SUBCOOLING METHOD-
(Fixed Orifice Systems) - Outdoor Temp. >65°F (18°C)
NOTE - Subcooling is the recommended charging
procedure IF return air conditions are 80°/= DB and 67 °
F WB. If return air dry bulb and wet bulb conditions
are different, use the Superheat Charging method.
If charging a fixed orifice system when the outdoor ambient
is 65°F (18°C) or above, use the subcooling method to
charge the unit,
1. With the manifold gauge hose still on the liquid service
port and the unit operating stably, use a digital
4. Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine
subcooling,
Saturation Temperature °F ( °C)
-- = Liquid Line Temperature °F (°C)
= Subcooling Value °F (°C)
5. Compare the subcooling value with those in table 6 or
table 7. If subcooling is greater than shown, recover
some refrigerant. If subcooling is less than shown, add
some refrigerant,
IMPORTANT
thermometer to record the liquid line temperature,
2, At the same time, record the liquid line pressure reading.
3, Use a temperature/pressure chart to determine the
saturation temperature for the liquid line pressure
reading,
Table 6. Subcooling Values For Fixed Orifice Systems
-024
13
(7)
12 (6.7)
11
(6)
11 (6)
10
(5.6)
10
(5.6)
10
(5.6)
10
(5.6)
g (5)
8 (4.5)
6 (3.3)
°F (°C)**
65 (18)
70 (21)
75 (24)
80 (27)
85 (29)
90 (32)
95 (35)
100 (38)
105 (41)
110 (43)
115 (45)
(HCFC-22)*
13ACD / AC13 Outdoor Condensing Units Models
-030
7 (4)
6
(3.3)
5 (3)
5 (3)
5 (3)
4 (2.2)
4 (2.2)
3
(2)
3
(2)
2(1)
2(1)
-036
14 (8)
13 (7)
13 (7)
12 (6.7)
11 (6)
10
(5.6)
9 (5)
g (5)
8 (4.5)
6 (3.3)
6 (3.3)
-042
15
(8.3)
14
(8)
13
(7)
12 (6.7)
11 (6)
10
(5.6)
9 (5)
8 (4.5)
7 (4)
7 (4)
5 (3)
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ii//i!i/iiii!Ii////////%i///i%!/i/!//iiiii/i_iii/ii//i_iiii
iliiiiil_ill_ill_ill_ill_ill_il_illlllllllllllllli
13HPD / HP13 Outdoor Heat Pump Units Models
-030
14 (7.7)
12 (6.6)
11
(6)
10(5.5)
g (5)
6
(3.3)
-036
13(7.1)
lO(5.5)
8 (4.4)
7 (3.8)
6
(3.3)
3(1.7)
-042
13 (7.1)
lO (5.5)
8 (4.4)
7 (3.8)
6
(3.3)
3
(1.7)
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-018
13
(7)
13
(7)
10
(5.6)
10
(5.6)
8 (4.5)
8 (4.5)
7 (4)
7 (4)
6
(3.3)
6
(3.3)
3
(2)
°F (°C)** -018 -024
65(18) 13(7.1) 15(8.2)
75 (24) 10 (5.5) 13 (7.1)
85 (29) 8 (4.4) 11 (6)
95 (35) 7 (3.8) 9 (5)
105 (41) 6 (3.3) 8 (4.4)
115 (45) 3 (1.6) 5 (2.7)
* Liquid Subcooling: + I'_F (,6'_C)
** Outdoor Ambient Temperature,
-060
13
(7)
12 (6.7)
12 (6.7)
12 (6.7)
11 (6)
10
(5.6)
10
(5.6)
g (5)
g (5)
g (5)
8 (4.5)
-060
11 (6)
11 (6)
10.5(5.8)
lO(5.5)
9.5 (5.2)
8.5 (4.7)
Page 17
CB(X)26UH SERIES