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• J <br />1*^ <br />■44 <br />i <br />i <br />; <br />r <br />I' #1 <br />7*• • <br />3. <br />4. <br />5. <br />6. <br />7. <br />8 . <br />9. <br />Heating operation - day: Fan shall run continuously. <br />Outdoor and return air dampers shall be open. The Tetco <br />heating unit solenoid valve shall cycle to maintain the <br />space temperature. If space temperature falls belov set <br />point by 5°F, the bacKup furnace single or two stage gas <br />valves shall cycle to maintain the thermostat set point <br />in the room. <br />Heating operation - night: Same as above except the oper- <br />atior; now shall be controlled from night setback setting <br />of the thermostat. <br />Cooling operation - day: The fan shall run continuously. <br />The cooling coil control valve shall modulate to maintain <br />thermostat. Set point on cooling stat. Outside air and <br />retur 1 air dampers shall be open. <br />Cooling operation night: Same as above. <br />Humidity control in the system provided with humidistats <br />shall be from a space humidistat. The signal from humi- <br />distat shall cause the water supply valve to open accord­ <br />ing to space demand. <br />All basement units (S-1# S-2) shall receive return air <br />from near the floor in winter and from near the ceiling <br />in summer. Provide manual dampers to make this change <br />possible. For Units S-1, S-2, S-4 and S-5 provide humidity <br />controller TH and relays to interface between thermostat <br />and Tetco unit to maintain proper humidity in summer. <br />Provide two-stage cooling, first stage by direct well water <br />cooling and second stage by chilled water from evaporator <br />at approximately 40°F water to cooling coils. Proper tem­ <br />perature and humidity set points shall be maintained by <br />two stage cooling and condenser reheat cycle. <br />System S-1 (Basement) and S-10 (Porch Unit). This system <br />shall have additional controls as sensed bv thermostat <br />TC. <br />(2) <br />Whenever porch temperature rises to 3°F as sensed <br />by thermostat TC due to solar gain in the heating <br />season the following shall happen: <br />(1) The motorized damper in RA from porch to Unit <br />S-10 shall close and motorized damper in RA <br />from basement to S-lO shall open thereby allowing <br />Unit S-10 to get colder return air from basement <br />instead of porch. <br />The motorized damper in return air from basement <br />to Unit S-1 shall close and motorized damper <br />in return air from porch to Unit S-1 shall open, <br />thereby allowing Unit S-1 to receive warmer <br />return air from porch instead of basement. <br />Unit S-i2, S-13, S-14 (Rear Hall and Bedroom Units). <br />These units shall have the following additional controls: <br />a. Whenever the temperature rises in the spaces served <br />by these units, the normally closed manual dampers <br />installed in return air intakes to these units from <br />basement to open dampers manually thereby allowing <br />cold air from basement to circulate through these <br />units. Balancing of air flow shall occur through <br />various equalizing ducts. <br />15900-5 <br />i