2.10.5.2 DESIGN CONSIDERATIONS
Provide a dedicated, thermostatically controlled, mechanical ventilation or
recirculatory mechanical cooling system to maintain the indoor design
conditions. The mechanical ventilation system shall be used only at those
locations where the summer outdoor design temperatures (0.4 percent ASHRAE
Weather Chart) does not exceed 26 degrees C (80 degrees F). The summer and
winter indoor temperatures settings shall be such that simultaneous heating
and cooling shall be avoided at any given time. For a specific application,
should it become necessary to maintain lower space temperature and humidity
for the microprocessor based electronic controls, provide a dedicated cooling
unit (DX or chilled water). Heating may be provided by 4-pipe fan coil units
along w/cooling or separately by unit heaters. See Article 2.12 for the
dedicated refrigeration system. Coordinate with the VA and/or the elevator
equipment manufacturer.
2.10.5.3 CODE COMPLIANCE
2.10.5.3.1 Mechanical equipment installations in elevator machine rooms shall
conform to the National Electric Code. It conforms to rule 102.2 of American
National Standard Safety Code for Elevators ANSI/ASME A17.1-1985, which says,
"Pipes or ducts conveying gases, vapors, or liquids, not used in connection
with the operation of the elevator, shall not be installed in hoistway, or
machine room."
Exceptions:
(a) Steam and hot water pipes may be installed in hoistways or machine rooms
for the purpose of heating these areas only.
(1) Heating pipes shall convey only low pressure steam 35 kPa (5 PSIG)
temperature or less or hot water at 100 degrees C (212 degrees F) or less.
(2) All risers and return pipes shall be located outside the hoistway.
(3) Traps and shut-off valves shall be provided in accessible locations
outside the hoistway.
(b) Ducts for heating, cooling, and ventilating may be installed in the
machine room.
2.10.5.3.2 Life Safety Code NFPA 101 requires that when stand-by power is
connected to the elevator, the machine room ventilation or air-conditioning
shall also be connected to stand-by power; exception: existing elevators.
2.10.5.4 HEAT EMISSION
Heat emission data for the elevator equipment in the machine room shall be
obtained from an elevator manufacturer. Heat emitted includes that from the
elevator hoisting motors, motor-generator sets, machine brake coils and all
elevator control equipment located in the machine room(s). Use the following
as preliminary guide for calculating heat load.
(a) For variable voltage DC with motor-generator (MG) set:
BTU/Hr/Car = Rated Elevator Motor HP x 0.3 x 2544
This heat release shall be divided, if appropriate, 60 percent for MG room
and 40 percent for machine and controller room.
HVAC DESIGN MANUAL
2-27
HVAC SYSTEMS AND EQUIPMENT
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