(b) Elevator Machine Rooms
(c) Electrical Switchgear Rooms
2.7.6.3 EQUIPMENT
(a) Unit Heaters & Cabinet Unit Heaters
(b) Convectors
(c) Radiant Heating Ceiling Panels
(d) Baseboard Radiation
(e) Air Curtains
(f) Unit Mounted Heating Coils
(g) Air Terminal Units
2.7.6.4 CONTROLS: The electric heat shall be thermostatically controlled.
Wherever the electric heating equipment is used in a space, cooled by the
mechanical refrigeration, a single thermostat, to avoid the possible
occurrence of simultaneous cooling and heating, shall control the space
temperature.
2.7.7 GAS HEATING
2.7.7.1 GENERAL: Where natural gas or LPG is readily available, use of the
gas fired heating, particularly for the miscellaneous applications listed
under paragraph 2.7.7.2 shall be evaluated.
following equipment:
(a) Unit Heaters
(b) Heating & Ventilation Units
(c) Roof Top, Self-contained HVAC Units
to maintain the design temperatures.
2.8
ETHYLENE GLYCOL-WATER SYSTEMS
2.8.1 GENERAL
2.8.1.1 An ethylene glycol solution of 20 percent by weight has a freezing
point of 8 degrees C (18 degrees F). This is the point where first crystals
begin to form. Actual freezing into a solid occurs at much lower temperatures
(-44 degrees C) (-50 degrees F).
2.8.1.2 Heating applications shall be limited to 20 percent by weight of
glycol for preheat and run around coil applications.
HVAC DESIGN MANUAL
2-17
HVAC SYSTEMS AND EQUIPMENT
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