Honeywell T7200E2005 Manual Specification

Single Stage Heat Pump Programmable

1.0 GENERAL

1.1 Overview
The contractor shall furnish, install, and place in operating condition an HVAC control system described herein.

All units shall be located in accordance with the plans.

1.2 Type of System

1.2.1 System Requirements

Commercial Thermostat

GUIDE SPECIFICATION

a. Controls one heating and one cooling stages for heat pump applications.
b. Permit seven day programming.
c. Provide two occupied and two unoccupied periods per day.
d. Offer automatic heat/cool changeover with 2°F minimum deadband.
e. Provide override capability for a three hour period.
f. Include a comfort adjust feature to modify setpoints for a three hour period.
g. Provide Proportional plus Integral (P + I) temperature control.
h. Permit automatic or manual changeover between heating and cooling setpoints.
i. Display room temperature in °F or °C.
j. Display time in 12 or 24 hour clock format.

1.2.2 System Components

a. Seven day programmable thermostat.
b. Wallplate.

1.3 Codes and Standards

1.3.1 The system shall comply with applicable provisions of ASHRAE 90-75.

1.3.2 These specifications are based on equipment from Honeywell to set a standard for design and quality.

1.4 Wiring

1.4.1 All wiring meets National Electrical Codes and local electrical codes.

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

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

the equipment supplied.

defects in materials and workmanship for 12 months. Warranty service shall be performed by the
contractor.

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SINGLE STAGE HEAT PUMP PROGRAMMABLE COMMERCIAL THERMOSTAT

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

2.1.2 The thermostat shall energize heating equipment when space temperature falls below heating

2.2 Cooling

2.2.1 The thermostat shall control the cooling output based on the demand signal communicated from the

2.2.2 The thermostat shall energize cooling equipment when space temperature exceeds cooling setpoint.

2.3 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:

2.4 Setpoint Recovery from Unoccupied to Occupied

thermostat program, taking into account both space temperature deviation (proportional error) and the
duration of that temperature deviation (integral error).

setpoint.

thermostat program, taking into account both space temperature deviation (proportional error) and the
duration of that temperature deviation (integral error).

Table of Default Program

Occupied Unoccupied

Heating Setpoints 70°F (21°C) 55°F (13°C)
Cooling Setpoints 78°F (26°C) 90°F (32°C)

The thermostat shall employ Intelligent Recovery™. This shall select the optimum time to begin building warm
up or cool down based on setpoints and occupied program as follows:

2.4.1 Heating: 5°F per hour.

2.4.2 Cooling: 5°F per hour.

2.5 Fan Operation

2.5.1 Fan operation shall be energized with calls for cooling and calls for heating (optional).

2.6 Heating and Cooling Operation Minimum On and Off Times
The thermostat shall incorporate a program to maintain minimum-stage operation in both the heating and

cooling:

2.6.1 Cooling: 2 minutes on and 4 minutes off.

2.6.2 Heating: 2 minutes on and 4 minutes off.

2.7 Power Interruption
The system shall cycle off and provide timed restaging of heating or cooling equipment upon restoration of

power. The restaging operation shall occur according to minimum stage operation times incorporated in the
thermostat. A power interruption is annunciated by a blank LCD display.

2.7.1 During a power interruption less than 2 hours, the thermostat retains all programmed occupied and

unoccupied start times and temperatures as well as the present time and day.

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