30
Table 4
Temperature versus Resistance
(temperature vs resistance)
Degrees
F°
Degrees
C°
Nominal
Resistance
-20°
-28.9°
170.1 K - Ohms
-15°
-26.1°
143.5 K - Ohms
-10°
-23.3°
121.4 K - Ohms
-5°
-20.6°
103.0 K - Ohms
0°
-17.8°
87.56 K - Ohms
5°
-15.0°
74.65 K - Ohms
10°
-12.2°
63.80 K - Ohms
15°
-9.4°
54.66 K - Ohms
20°
-6.7°
46.94 K - Ohms
25°
-3.8°
40.40 K - Ohms
30°
-1.1°
34.85 K - Ohms
35°
1.7°
30.18 K - Ohms
40°
4.4°
26.22 K - Ohms
45°
7.2°
22.85 K - Ohms
50°
10.0°
19.96 K - Ohms
55°
12.8°
17.47 K - Ohms
60°
15.6°
15.33 K - Ohms
65°
18.3°
13.49 K - Ohms
70°
21.1°
11.89 K - Ohms
75°
23.9°
10.50 K - Ohms
80°
26.7°
9.297 K - Ohms
85°
29.4°
8.247 K - Ohms
90°
32.2°
7.330 K - Ohms
95°
35.0°
6.528 K - Ohms
Temperature
Table 5
Sizing Natural Gas Pipe Mains & Branches
Iron Pipe Size (IPS) Inches
Length of
1/2"
3/4"
1"
1 1/4"
1 1/2"
Pipe (Ft.)
Pipe
Pipe
Pipe
Pipe
Pipe
15
76
176
345
750
1220
30
52
120
241
535
850
45
43
99
199
435
700
60
38
86
173
380
610
75
77
155
345
545
Capacity of Pipe of Different Diameters and
Lengths in Cu. Ft. Per Hr. with Pressure
Drop of 0.3" and Specific Gravity of 0.60
Iron Pipe Size (SI) Millimeters
Length of
15 mm 20 mm 25 mm 32 mm 40 mm
Pipe (Meters) Pipe
Pipe
Pipe
Pipe
Pipe
4.6
2.15
4.98
9.76
21.23
34.54
9.1
1.47
3.39
6.82
15.14
24.06
13.7
1.21
2.80
5.63
12.31
19.82
18.3
1.07
2.43
4.89
10.76
17.27
22.9
—
2.18
4.38
9.76
15.40
Capacity of Pipe of Different Diameters and
Lengths in Cu. Meter Per Hr. with Pressure
Drop of 74.6 Pa and Specific Gravity of 0.60
Figure 7
Schematic Diagram for Field Gas Piping to Unit
Figure 8
Typical Unit Gas Train Configuration
Use the checklist provided below in conjunction with the
“General Unit Requirements” checklist to ensure that the
unit is properly installed and ready for operation.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote discon-
nects before servicing. Follow proper lockout/tagout pro-
cedures to ensure the power can not be inadvertently en-
ergized. Failure to disconnect power before servicing
could result in death or serious injury.
[ ] Check all electrical connections for tightness and “point of
termination” accuracy.
[ ] Verify that the condenser airflow will be unobstructed.
[ ] Verify that the condenser fan and indoor blower turn freely
without rubbing and are properly tightened on the shafts.
[ ] Check the supply fan belts for proper tension and the fan
bearings for sufficient lubrication. If the belts require ad-
justment, or if the bearings need lubricating, refer to the
maintenance section of this manual for instructions.
[ ] Verify that a condensate trap is installed and the piping is
properly sized and pitched.
Installation