Sequence Of Operations - Honeywell T7300F Manual Specification

T7300F MULTISTAGE CONVENTIONAL OR HEAT PUMP PROGRAMMABLE COMMERCIAL THERMOSTAT
1.5 Testing Guarantee Service
1.5.1 Prior to installation, the contractor shall provide copies of submittals.
1.5.2 The contractor is responsible for assuring that conduit and wire quantity, size, and type are suitable for
the equipment supplied.
1.5.3 Upon completion, the contractor shall conduct a total system test for the owner and engineer.
1.5.4 All components, parts, and assemblies supplied by the manufacturer shall be guaranteed against
defects in materials and workmanship for 12 months. Warranty service shall be performed by
the contractor.
2.0

SEQUENCE OF OPERATIONS

The heating and cooling setpoints shall be individually adjustable for both the occupied and unoccupied periods. The
thermostat shall have a minimum deadband of 2 F (no mechanical heating or cooling shall operate within this
deadband). Space temperature deviation above the cooling setpoint or below the heating setpoint shall generate a
demand signal to control the system as follows.
2.1 Heating
2.1.1 The thermostat shall control the heating output based on the demand signal communicated from the
thermostat program, taking into account both space temperature deviation (proportional error) and the
duration of that temperature deviation (integral error).
2.1.2 The thermostat shall energize heating equipment when space temperature falls below
heating setpoint.
2.1.3 In heat pump applications, auxiliary heat shall be controlled at 2 F below heating setpoint.
2.2 Cooling
2.2.1 The thermostat shall control the cooling output based on the demand signal communicated from the
thermostat program, taking into account both space temperature deviation (proportional error) and the
duration of that temperature deviation (integral error).
2.2.2 The thermostat shall energize cooling equipment when space temperature exceeds cooling setpoint.
2.2.3 A solid state enthalpy changeover control shall determine the capability of the outdoor air to provide
free cooling (optional). The system shall operate as follows:
a.
b.
2.3 Economizer Interface
The auxiliary relay contacts of the subbase shall be connected to the economizer's minimum position
potentiometer.
2.3.1 Occupied Period: The auxiliary relay contact will close, allowing the economizer to operate normally
and be available for free cooling if outdoor conditions permit.
2.3.2 Unoccupied Periods: The auxiliary relay contact will open, defeating the economizer
minimum position.
2.4 Heating Setback and Cooling Setup
Initiation of heating setback or cooling setup for each of 7 days shall be provided by a programmed time
schedule manually entered into the thermostat. When all or a portion of a manually programmed schedule is
unavailable, the thermostat shall control to the default program as follows:
63-4364—1
Free Cooling Available From Outdoor Air: On a call for cooling, the system shall enable the
economizer to provide free cooling. If this does not meet the space demand, the system shall call
for mechanical cooling to satisfy the programmed setpoint.
Free Cooling Not Available From Outdoor Air: On a call for cooling, the system shall hold the
economizer to minimum position and cooling shall be energized to satisfy the
programmed setpoint.
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