T7350 Guide Specification

T7350 Guide Specification
T7350 Programmable Commercial Thermostat
FOR MULTISTAGE CONVENTIONAL, HEAT PUMP,
AND MODULATING SYSTEMS
GUIDE SPECIFICATION
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.
63-2621—2
T7350 PROGRAMMABLE COMMERCIAL THERMOSTAT
E.
Testing Guarantee
Service:
Prior to installation, the contractor shall provide copies of submittals.
The contractor is responsible for assuring that conduit and wire quantity, size, and type are suitable
for the equipment supplied.
Upon completion, the contractor shall conduct a total system test for the owner and engineer.
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.
SEQUENCE OF OPERATIONS
The heating and cooling setpoints shall be individually adjustable for both the occupied, unoccupied and standby periods. The
thermostat shall have a minimum deadband of 2°F (1°C) (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:
A.
Heating:
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 gain),
the duration of that temperature deviation (integral gain), and the rate of change of the deviation
(derivative gain).
The thermostat shall energize heating equipment when space temperature falls below heating
setpoint.
B.
Cooling:
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 gain),
the duration of that temperature deviation (integral gain), and the rate of change of the deviation
(derivative gain).
The thermostat shall energize cooling equipment when space temperature exceeds cooling
setpoint.
(Optional Remote Equipment) 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. 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.
b. 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.
C.
Economizer Interface: The auxiliary relay contacts of the subbase shall be connected to the economizer’s minimum
position potentiometer or power circuit.
a. Occupied Period: The auxiliary relay contact will close, allowing the economizer to operate
normally and be available for free cooling if outdoor conditions permit.
b. Unoccupied Periods: The auxiliary relay contact will open, defeating the economizer
minimum position.
D.
Dehumidification:
E.
Heating Setback and
Cooling Setup:
63-2621—2
The thermostat shall provide five methods for dehumidification:
a. Minimum On - Increasing the compressor minimum on time.
b. Reset - lower the cooling setpoint.
c. Reheat - cooling and simultaneous reheat.
d. Auxiliary output - to external dehumidifier.
e. Hot gas bypass - auxiliary output operates depending on humidity level and number of active
cooling stages.
Initiation of heating setback or cooling setup for each of 7 or 365 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 shown in Table 1.
2
T7350 PROGRAMMABLE COMMERCIAL THERMOSTAT
Table 1. Default Program.
Occupied
Unoccupied
Standby
Heating Setpoints
70°F (21°C)
55°F (13°C)
67°F (19°C)
Cooling Setpoints
78°F (26°C)
85°F (29°C)
78°F (26°C)
F.
Setpoint Recovery
from Not Occupied
to Occupied:
The thermostat shall incorporate a ramping feature that gradually changes the space setpoints.
During recovery operation, the setpoint changes at a rate in degrees per hour depending on the
outdoor air temperature. If there is no outdoor air temperature sensor available, the minimum ramp
rate is used. A PDA can be used to individually adjust ramp rates for heating and cooling.
G.
Fan Operation:
Fan operation shall be selectable as follows:
a. On: Fan operates continuously in occupied mode, and during standby modes, and during a
call for heat or cool.
b. Auto: Fan is energized with calls for heating and cooling.
H.
Minimum Stage
Operation Time:
I.
Power Interruption:
a. On loss of power, the thermostat shall maintain programmed times and temperatures for 10
years.
b. Clock and day information shall be retained for a minimum of 48 hours.
J.
Overrides:
a. The Temporary Occupied Override can be used when the thermostat is in Not Occupied or
Standby mode. It shall switch to the Occupied mode for an installer-configured number of
hours. The default shall be three hours.
b. The Temporary Not Occupied Override shall fix the schedule to operate in Not Occupied
mode for a number of days (between 1 and 99) without changing programming saved in
memory.
c. Pressing “Run Schedule” shall cancel the overrides and return to the program.
a. Minimum On: Heat - 1 minute; Cool - 3 minutes.
b. Minimum Off: Cool & Heat Pump - 1 minute.
THERMOSTAT MODELS AND FEATURES
Table 2. T7350 Thermostat Features.
Maximum Stagesa
Model
T7350A
T7350B
Applications
Conventional 1b
or
b
Heat Pump 2
T7350D
T7350H1009
T7350H1017 Modulating
T7350M
Heat
3 (2)c
Cool
Features
Auxiliary LonWorks®
Relay
Certified?
Yes
1b
2b
Outdoor, Discharge Air Capability
Yes
3 (4)c
Humidity, Occupancy,
Outdoor, Discharge Air Capability
Yes
No
Isolated Yes
Normally Yes
Open
2 modulating, 2b relay Humidity, Occupancy,
Outdoor, Discharge Air Capability,
4-20 mA output (2-10 Vdc with 500 ohm resistor) Yes
No
a
All models are down-selectable and can be configured to control fewer stages than the maximum allowed.
One extra stage (of either heat or cool) can be configured using the auxiliary relay.
c Heat pump applications for these models have a maximum of two heat stages and two cool stages.
b
3
63-2621—2
T7350 PROGRAMMABLE COMMERCIAL THERMOSTAT
OPTIONS
A.
Discharge Air
Sensors:
B.
Outdoor Air Sensors: C7089A1002, C7170A1002.
C.
Temperature Sensors
(Remote):
T7770A1006, T7770B1046, T7770C1044, T7770D1000, and T7771A1005 (any T7770 20K NTC).
D.
Economizer Logic
Modules:
W6210, W6215, W7210, W7212, W7215, W7459.
E.
Humidity Sensors
(Remote):
H7625, H7635, H7655.
F.
PDA Units:
C7041, C7031J1050 (Averaging), C7770A1006.
Palm® V, Vx, M105, M125, and i705 handhelds; TRGPro handheld; ZIRE™ 71 handheld;
TUNGSTEN™ T, T2, and C handhelds.
NOTE: See customer.honeywell.com for software to configure a T7350 with a PC.
G.
Other Accessories:
209651A Vertical Mounting Hardware Wallplate Adapter (Trident white).
50000083-001 Thermostat Interface Module (TIM).
50014064-001 Infra-Red TIM.
50000452-001 Troubleshooting Cable.
TG511, TG512 Universal Versaguard™ Thermostat guards.
ZIRE and TUNGSTEN are trademarks of palmOne, Inc.
Palm® is a registered trademark of PalmSource, Inc.
Automation and Control Solutions
Honeywell International Inc.
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Registered Trademark
© 2005 Honeywell International Inc.
63-2621—2 J.I. Rev. 11-05
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