GUIDE SPECIFICATION
63-2621—2
T7350 Programmable Commercial Thermostat
FOR MULTISTAGE CONVENTIONAL, HEAT PUMP,
AND MODULATING SYSTEMS
GENERAL
A. 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.
B. Type of System:
System Requirements:
a. Control up to three heating and three cooling stages for gas heat, electric heat, heat pump or
compressor cooling.
b. Permit 365-day programming with schedule copy.
c. Provide 365-day clock with automatic daylight savings changeover and up to 10 holidays.
d. Provide 48-hour clock backup.
e. Provide two occupied and two unoccupied periods per day.
f. Offer automatic heat/cool changeover with 2°F (1°C) minimum deadband.
g. Provide override capability for a 1 to 8 hour configurable period, with 3-hour default.
h. Include a comfort adjust feature to modify setpoints for the override duration.
i. Provide configurable Proportional plus Integral plus Derivative (P + I + D) temperature
control.
j. Display room temperature in °F or °C.
k. Use multiple remote sensors (optional).
l. Use in conjunction with an economizer (optional).
m. Provide three levels of keypad lockout - none, overrides only and complete.
n. Provide occupancy input for Standby setpoint (optional).
o. Provide Temporary Not Occupied Override, 1-99 days.
p. Provide discharge high and low limits (with optional sensor).
q. Provide outdoor ambient lockout (with optional sensor).
r. Provide keypad method for saving and restoring both user and factory default settings.
s. Provide five methods for dehumidification (minimum ON time, reheat, reset temp setpoint, hot
gas bypass and simple dehumidification.
t. Provide 2 modulating 4-20 mA (direct or reverse action) outputs for modulating heat and/or
cooling.
u. Provide separate configurable recovery ramps for heating and cooling.
v. Provide sequential start after power failure.
w. Provide separate configurable cycle rates for heating and cooling response.
x. Provide ability to calibrate temperature sensor.
System Components:
a. Seven day (365 day optional) programmable thermostat with subbase.
b. Discharge air sensor (optional).
c. Wall mount temperature and integral or wall mount humidity sensors (optional).
d. Outdoor air sensor (optional).
e. Occupancy sensor (optional).
C. Codes and Standards:
The system shall comply with applicable provisions of ASHRAE 90-75.
These specifications are based on equipment from Honeywell to set a standard for design and
quality.
D. Wiring:
All wiring shall meet National Electrical Codes and local electrical codes.
