 |
|||
|
Page Title:
Table 1. Sound power level, decibels re 10-12 watts |
|
||
| ||||||||||
|
|  MIL-U-17293D(SH)
ready for installation and connection to an alternating current power source
and to t ` e heating medium supply and return. The supply and return connections
shall be on the same side of the unit.
3.3.2.1 Shock . The unit heater shall pass the high impact shock tests
in accordance with MIL-S-901 for grade A, class I equipment.-
3.3.2.2 Vibration. The unit heater shall be constructed such that no
damage will occur or malfunction be caused either by internally excited
vibrations, or by the environmental vibrations in accordance with MIL-STD-167-1
for frequencies up to, and including 33 hertz (Hz).
3.3.2.3 Noise. The unit heater by construction shall meet the sound
power level in table I. The noise level shall be measured in accordance with
4.3.4.3.
Sound power level, decibels re 10-12 watts.
TABLE 1.
8000
4000
2000
500
1000
125
250
63
Octave
band (Hz)
68
71
75
74
82
Size 11
79
81
86
68
77
72
77
87
84
82
84
Size 12
75
'70
78
77
86
85
89
91
Size 13
76
71
82
79
89
Size 1 4
87
92
90
78
74
83
87
93
91
Size 15
88
91
81
76
84
88
102
93
95
Size 16
92
3.3.3 Capacity rating. The capacity rating of the unit heater shall be
at least equal to that as specified in table II, based on 25 pounds per square
inch (lb/in2) steam pressure, and 70 degrees Fahrenheit (F) dry-bulb temperature
entering the fan inlet. The temperature of the air leaving the heater shall not
exceed that specified in table 11 by more than 3.0F, and the air flow shall be
within plus or minus 5 percent of the rated air flow as specified in table II.
TABLE II. Capacity.
Temperature,
Air flow
Capacity
Size
leaving, `F
Standard cubic feet/rein
BTU/HR
126
300
18,000
11
126
500
12
30,000
124
790
46,000
13
122
1330
74,500
14
122
2060
15
116,000
122
3310
16
186,500
5
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals