LG 395CAV User Manual
Page 13
(3.) When correct input is obtained, replace regulator
seal cap. Main burner flame should be clear blue,
almost transparent. (See Fig. 13.)
d. High altitude—In the United States gas input on rating
plate is for altitudes up to 2000 ft. Ratings for altitudes
over 2000 ft must be 4 percent less for each 1000 ft
above sea level. To obtain the adjusted altitude rating,
adjust the manifold pressure (see item c) and replace the
main burner orifices as needed. Refer to National Fuel
Gas Code Appendix F, Table F-4 for proper orifice
sizing at high altitudes.
e. Canadian installations only—The Canadian ratings are
approved for altitudes up to 2000 ft for natural and
propane gases. High-altitude ratings are from 2000 ft to
4500 ft above sea level. See Table 8 for nominal burner
orifice size. High-altitude rating includes a 10 percent
derate as required by Canadian standards.
2. Set temperature rise.
Furnace must operate within range of temperature rise
specified on the unit rating plate. Determine the air tem-
perature rise as follows.
a. Place duct thermometers in return and supply ducts as
near furnace as possible. Be sure thermometers do not
"see" heat exchangers so that radiant heat will not affect
thermometer readings. This is particularly important
with straight-run ducts.
b. When thermometer readings stabilize, subtract return-air
temperature from supply-air temperature to determine
temperature rise.
c. Adjust air temperature rise by adjusting blower speed.
Increase blower speed to reduce temperature rise. De-
crease blower speed to increase temperature rise.
WARNING:
Disconnect the electrical power before
changing the speed tap. A failure to follow this warning
can cause personal injury.
d. To change blower motor speed selections for heating
mode, remove blower motor lead from control board
HEAT terminal. (See Fig. 11.) Select desired blower
motor speed lead from 1 of the other terminals and
relocate it to HEAT terminal. See Table 9 for lead color
identification. Reconnect original lead on SPARE termi-
nal.
CAUTION:
Recheck temperature rise. It must be within
limits specified on unit rating plate. Recommended op-
eration is at midpoint of rise or above.
TABLE 7—GAS RATE CU FT/HR
SECONDS
FOR 1
REVOLUTION
SIZE OF
TEST DIAL
SECONDS
FOR 1
REVOLUTION
SIZE OF
TEST DIAL
1
cu ft
2
cu ft
5
cu ft
1
cu ft
2
cu ft
5
cu ft
10
11
12
13
14
360
327
300
277
257
720
655
600
555
514
1800
1636
1500
1385
1286
50
51
52
53
54
72
71
69
68
67
144
141
138
136
133
360
355
346
340
333
15
16
17
18
19
240
225
212
200
189
480
450
424
400
379
1200
1125
1059
100
947
55
56
57
58
59
65
64
63
62
61
131
129
126
124
122
327
321
316
310
305
20
21
22
23
24
180
171
164
157
150
360
343
327
313
300
900
857
818
783
750
60
62
64
66
68
60
58
56
54
53
120
116
112
109
106
300
290
281
273
265
25
26
27
28
29
144
138
133
129
124
288
277
267
257
248
720
692
667
643
621
70
72
74
76
78
51
50
48
47
46
103
100
97
95
92
257
250
243
237
231
30
31
32
33
34
120
116
113
109
106
240
232
225
218
212
600
581
563
545
529
80
82
84
86
88
45
44
43
42
41
90
88
86
84
82
225
220
214
209
205
35
36
37
38
39
103
100
97
95
92
206
200
195
189
185
514
500
486
474
462
90
92
94
96
98
40
39
38
38
37
80
78
76
75
74
200
196
192
188
184
40
41
42
43
44
90
88
86
84
82
180
176
172
167
164
450
439
429
419
409
100
102
104
106
108
36
35
35
34
33
72
71
69
68
67
180
178
173
170
167
45
46
47
48
49
80
78
76
75
73
160
157
153
150
147
400
391
383
375
367
110
112
116
120
33
32
31
30
65
64
62
60
164
161
155
150
Fig. 12—Redundant Automatic Gas Control Valve
A95618
MANIFOLD
PRESSURE TAP
GAS
PRESSURE
REGULATOR
ADJUSTMENT
INLET
PRESSURE TAP
ON AND
OFF SWITCH
Fig. 13—Burner Flame
A89020
BURNER FLAME
BURNER
MANIFOLD
TABLE 8—CANADIAN ORIFICE SIZE
GAS
SEA LEVEL
0—2000 FT
HIGH ALTITUDE
2000—4500 FT
Natural
43
44
Propane
54
55
—13—
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