accessories, and a protected gauge glass. The tank shall be the diameter
shown and shall have a capacity of not less than [_____] liters gallons.
The tank shall be hydrostatically tested at the factory at not less than
690 kPa 100 psig.
2.24
BUILDING HEATING EQUIPMENT
2.24.1
Unit Heaters
2.24.1.1
General
The manufacturer of the unit heaters shall not select individual heaters
with a capacity in excess of 125 percent of the value specified for the
heater. Orifice plates shall be provided to reduce the joule Btu output
where required. The noise level of each unit heater shall be appropriate
for the space in which the heater is installed. The sound power level
[_____] decibels reference shall not exceed the following values in each
octave band at the midfrequency, cycles per second:
Octave Bands
3
4
5
6
7
Midfrequency (in Hz)
250
500
1000
2000
4000
Sound Power Level
Office Space
54
50
47
45
43
Conference Rooms,
Communication Facilities
51
46
45
42
38
Shops, Factories
69
62
61
58
57
The sound power level data for these units shall be based on tests
conducted in accordance with ANSI S1.13.
2.24.1.2
Propeller Type Unit Heater
Heater shall be designed for suspension and arranged for horizontal or
vertical discharge of air as indicated. The casings shall be not lighter
than 0.912 mm 20 gauge steel. Suitable stationary or rotating air
deflectors shall be provided to assure proper air and heat penetration at
floor level. Suspension from heating pipes will not be permitted.
Vertical discharge heaters shall operate at speeds not in excess of 1200
rpm, except that units with 53 Megajoules 50,000 Btu output capacity or
less may operate at speeds up to 1,800 rpm. Horizontal discharge unit
heaters shall have discharge or face velocities not greater than the
following:
Unit Capacity
Face Velocity
Up to 0.472 cu m/second
4.0 m per second
Up to 1,000 cuf/minute
800 feet per minute
0.472 to 1.4 cu m/second
4.6 m per second
1.001 to 3,000 cu f/minute
900 feet per minute
1.4 and over cu m/second
5.1 m per second
3.001 and over cu f/minute
1,000 feet per minute
SECTION 15559A
Page 70
Previous Page
