06-06
Table 2 - 1 Indoor Design Conditions
Summer
Winter
Db C (F)
Db C (F)
Room or Area
%RH
%RH
Elevator Machine Rooms
39 (104)
-
10 (50)
-
Maximum
Telephone Equipment
19(65)-
40-60
19(65)-
40-60
Rooms
23(75)
23(75)
Toilets
25 (78)
--
21 (70)
--
Same as Electrical Equipment Room
Notes on Indoor Design Conditions:
1.
The indoor design conditions are not operating limits. All
room thermostats shall be adjustable between 15 C (60 F) and
29 C (85 F) with an adjustable dead band (6 C).
2.
For the elevator equipment room, see Article 3 for the
criteria for mechanical cooling. The mechanical cooling shall
also be evaluated for locations with the outdoor summer design
temperature in excess of 31 C (90 F); and, where the use of
a ventilation system would create excessive air movement, in
excess of 30 air changes per hour.
3.
Mechanical cooling shall be evaluated for the electrical
equipment and transformer rooms for locations with the outdoor
summer design temperature in excess of 31 C
(90 F); and, where the use of a ventilation system would
create excessive air movement, in excess of 30 air changes per
hour.
4.
See Section 3.0 for the telephone equipment room.
5.
Winter humidification for the office areas shall be evaluated
for the areas where the outdoor design temperature is -17 C
(0 F) and lower. The winter humidification system, if
included, shall be designed to maintain 30% RH.
6.
The summer inside design relative humidity listed in Table 2.2
need not be maintained by any humidity control. This value
merely represents the design reference point; and, in actual
practice, could vary with the prevailing internal heat loads
and coil leaving conditions.
7.
Single toilets do not require individual room temperature
controls in cooling mode. For exterior single toilets,
thermostatically controlled heating terminal devices should be
provided to maintain space temperature in winter mode. For
common (public) toilets, involving multiple water closets and
urinals, room temperature control is required in heating and
cooling modes.
8.
In the absence of any heat producing equipment, ventilation or
cooling/heating are not required for small electrical and
telephone closets. The storage closets, with areas less than
5.6 m2 (60 square feet), also need not be ventilated or
cooled/ heated.
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