Honeywell 63-2666-03 User Manual

T7351 Commercial Programmable Thermostat

FOR SINGLE- OR MULTI-STAGE CONVENTIONAL/HEAT PUMP SYSTEMS

PRODUCT DATA

FEATURES

• Typically used in buildings (including: restaurants, shopping malls, office buildings and banks) under 55,000 square feet.

• For single zone rooftop units, split systems, heat pumps or hot/chilled water systems.

• 365-day programming.

• Two Occupied and two Not Occupied periods per day.

• Individual heat and cool setpoints available for Occupied and Not Occupied periods.

• P+I+D control minimizes temperature fluctuations.

• Recovery ramp control automatically optimizes equipment start times based on building load.

• Convenient overrides allow temporary setpoint

APPLICATION

The T7351 Commercial Programmable Thermostat controls 24 Vac commercial single zone heating, ventilating and air conditioning (HVAC) equipment. The T7351 consists of a thermostat and subbase. The thermostat includes the keypad and display for 365-day programming. The subbase includes equipment control connections. The subbase mounts on the wall and the thermostat mounts to the subbase.

changes.

• Keypad multi-level lockout available with all models.

• Remote sensor capability for temperature (including outdoor air and discharge air) and humidity sensors.

• Auxiliary subbase contact typically interface with a Honeywell Economizer System (for total rooftop control integration) or act as dehumidification output.

• Universal Versaguard Thermostat guards available.

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 2

Ordering Information ........................................................ 2

Setting .............................................................................. 6

Installer Setup .................................................................. 7

Operation .......................................................................... 12

Troubleshooting Guide (Table 11) ..................................... 17

Wiring Diagram (Figures 14 and 15) ................................ 19

63-2666-03

T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

SPECIFICATIONS

IMPORTANT

The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit might not exactly match listed specifications. This product is tested and calibrated under closely controlled conditions; minor performance differences can be expected if those conditions are changed.

Table 1. T7351 Thermostat Features

Maximum Stages

Model Application

T7351F Conventional or

Heat Pump

This model is down-selectable and can be configured to control fewer stages than the maximum allowed.

Heat pump applications for this model have a maximum of two heat stages and two cool stages.

Mounting Means:

Mounts on subbase. Subbase Mounts On:

Wall: Using two 5/8 in. long #6-32 screws (included). Outlet Box: Using sheet metal screws.

Clock Accuracy at 77° F (25° C): ±1 min./month (30 days).

Minimum Stage Operation Time (fixed):

Minimum On

Heat: 1 minutes. Cool: 3 minutes.

Minimum Off (Cool and Heat Pump): 1 minute.

Electrical Ratings:

Power: 24 Vac, 50/60 Hz.; 20 to 30 Vac, 50/60 Hz. Input:

Temperature: 20K ohms. Humidity: 0-10 Vdc. Outdoor: 3000 PTC. Discharge Air: 20K ohms. Occupancy Sensor: Dry contact switching 30 Vdc at 1 mA.

All Relay Outputs (at 30 Vac):

Running: 1.5A maximum. Inrush: 7.5A maximum.

System Current Draw (without load):

5 VA maximum at 30 Vac, 50/60 Hz.

NOTE: Relays are N.O. Single-Pole, Single-Throw

(SPST).

3 (2)

Models: See Table 1.

Dimensions: Refer to Fig. 1.

Finish (color): Trident White.

Batteries: No batteries required

Features

3 (4)

Outdoor Sensor Wiring: Requires 18 gauge wire.

Humidity Ratings: 5% to 90% RH, noncondensing.

Emergency Heat Indication:

Display indicates when Emergency Heat is activated (Em).

Temperature:

Ratings:

Display Accuracy: ±1° F (±1° C). Setpoint:

Loss of Power: The thermostat maintains programmed times

NOTE: To achieve the 48-hour power-loss clock reten-

Approvals:

UL 873 Recognized, NEC Class 2. FCC Part 15 subpart J Class A. cUL.

Humidity, Occupancy, Outdoor, Discharge Air Capability

Operating Ambient: 30° to 110° F (-1° to 43° C). Shipping: -30° to +150° F (-34° to +66° C).

Range:

Heating: 40° to 90° F (4° to 32° C).

Cooling: 45° to 99° F (7° to 37° C). Deadband: 2° F (1° C). Default Settings: Refer to Table 2.

and temperatures for the life of the product. Clock and day information is retained for a minimum of 48 hours.

tion, the T7351 must be powered for at least 5 minutes.

Auxiliary

RelayHeat Cool

Ye s

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Honeywell Environmental and Combustion Controls Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1885 Douglas Drive North Minneapolis, Minnesota 55422-4386

3. http://customer.honeywell.com or http://customer.honeywell.ca International Sales and Service Offices in all principal cities of the world. Manufacturing in Belgium, Canada, China, Czech Republic, Germany, Hungary, Italy, Mexico, Netherlands, United Kingdom, and United States.

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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

CAUTION

MERCURY NOTICE

Table 2. Default Setpoints.

Control Occupied Not Occupied Standby

Heating 70° F (21° C) 55° F (13° C) 67° F (19° C)

Cooling 75° F (24° C) 85° F (29° C) 78° F (26° C)

2-3/16 (56)

2-1/32

(52)

2-1/32

(52)

1-9/16

(40)

4-1/16

(104)

M22432

4-1/2 (114)

SUBBASE

1-5/8

(42)

6-3/4 (171)

2-3/8 (60)

3-1/4 (83)

6-9/16 (166)

1-5/8

(42)

Fig. 1. Thermostat and Subbase Dimensions

in inches (mm).

Accessories:

Duct Discharge Air Sensors:

C7041B (6 or 12 in. [152 or 305 mm]), C7041C (18 in. [457 mm]), C7041J (12 ft. [3.66 m] averaging), C7770A (8 in. [203 mm] probe).

Outdoor Air Sensors: C7170A,

C7031G2014 (weatherproof).

Temperature Sensors (Remote): C7772A, TR21, TR22, TR23,

and TR24 series, TR21-WK, TR23-WK, T7771. Economizer Logic Modules: W7210, W7212, W7215, W7459. Humidity Sensors: H7625, H7635. Others:

209541B FTT network termination module.

209651A Vertical Mounting Hardware Wallplate Adapter

(Trident white). 50000452-001 Troubleshooting Cable. TG512 Universal Versaguard Thermostat guards.

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow them

could damage the product or cause a hazardous condition.

2. Check ratings given in instructions and on the product to ensure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After installation is complete, check out product operation as provided in these instructions.

Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry.

Disconnect power supply before installation.

IMPORTANT

All wiring must agree with applicable codes, ordinances and regulations.

If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly.

Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control. If you have questions, call Honeywell Customer Care Center at 1-800-468-1502.

Location

Do not install the thermostat where it can be affected by: — drafts, or dead spots behind doors and in corners. — hot or cold air from ducts. — radiant heat from sun or appliances. — concealed pipes and chimneys. — unheated (uncooled) areas such as an outside wall behind

the thermostat.

Subbase

WHEN USED TO SENSE ROOM TEMPERATURE

Install the thermostat about 5 ft. (1.5 m) above the floor in an area with good air circulation at average temperature. (Refer to Fig. 3.)

WHEN NOT USED TO SENSE ROOM TEMPERATURE

When using the remote-mounted temperature (and humidity) sensor(s) to sense ambient conditions, install the thermostat in an area that is accessible for setting and adjusting the temperature and settings.

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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

CAUTION

5 FEET

(1.5 METERS)

YES

M4823A

M29184

T4 T3

SUBBASE

TR21

T4 T3

T7350 SUBBASE

TR21-A

T4 T3

TR21-A

T4 T3

1 1

Equipment Damage Hazard. Can damage the TIM connection beyond repair.

Disconnect the TIM cable prior to opening or closing the thermostat cover.

NOTE: Allow sufficient clearance below the thermostat to

plug in the TIM cable.

Install the remote-mounted sensor(s) about 5 ft. (1.5 m) above the floor in an area with good air circulation at average temperature. (See Fig. 2.)

NOTE: Only TR21 models with neither setpoint adjust-

ment nor bypass can be used for temperature averaging.

Wall mounting (using standard drywall screws) is standard. Mounting to a 2 in.(50.8 mm) by 4 in. (101.6 mm) wiring box can be accomplished: — for a horizontal box, no extra hardware is required. — for a vertical box, part 209651A is required. — Mount to European standard wall box 2.4 in. (having 61 mm

between mounting screws in a horizontal line) with or without adaptive hardware.

1. Position and level the subbase.

NOTE: A level wallplate is only for appearance. The

thermostat functions properly when not level.

2. Use a pencil to mark the mounting holes. (Refer to Fig. 6.)

3. Remove the subbase from the wall and drill two 3/16 in. (4.76 mm) holes in the wall (if drywall) as marked. For firmer material such as plaster or wood, drill two 7/32 in. (5.56 mm) holes.

4. Gently tap anchors (provided) into the drilled holes until flush with the wall.

5. Position the subbase over the holes, pulling wires through the wiring opening.

6. Loosely insert the mounting screws into the holes.

7. Tighten mounting screws.

Fig. 2. Typical Location of Thermostat or Remote-Mounted

Sensor.

IMPORTANT

To avoid electrical interference, which can cause erratic performances, keep wiring runs as short as possible and do not run thermostat wires adjacent to the line voltage electrical distribution systems. Use shielded cable (Belden type 8762 or equivalent for 2-wire). The cable shield must be grounded only at the controlled equipment case.

Mounting Subbase

The subbase mounts horizontally or vertically.

IMPORTANT

• When using the internal temperature sensor, the device must be mounted horizontally (with the LCD facing upwards). Precise leveling is not needed.

• When using remote sensors, thermostat mounting orientation does not matter.

Fig. 3. Four TR21 Sensors providing a Temperature

Averaging Network for T7351 Thermostat.

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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

CAUTION

M29257

TR21

T4 T3

SUBBASE

WIRES THROUGH WALL

WALL ANCHORS (2)

M19608

MOUNTING HOLES

MOUNTING SCREWS

Wiring

Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry.

Disconnect power supply before installation.

IMPORTANT

All wiring must comply with local electrical codes and ordinances.

Fig. 5. Nine TR21 Sensors Providing a Temperature

Averaging Network for T7351 Thermostat.

NOTE: Maximum (and recommended) wire size is 18-

gauge (ø 1.02 mm). Do not use wire smaller than 22-gauge (ø 0.644 mm).

Follow equipment manufacturer wiring instructions when available. Refer to the Wiring Diagram section for typical hookups. A letter code is located near each terminal for identification. Refer to Tables 3 for terminal designations.

1. Loosen subbase terminal screws and connect system wires.

2. Securely tighten each terminal screw.

3. Push excess wire back into the hole in the wall.

4. Plug the hole with nonflammable insulation to prevent

drafts from affecting the thermostat.

Fig. 6. Mounting the Subbase.

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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

Table 3. T7351 Subbase for Three-stage Heat, Three-stage

Cool Systems.

Terminal

3. Press the lower edge of the case to latch.

NOTE: To remove the thermostat from the wall, first pull

out at the bottom of the thermostat; then remove the top.

ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE.

Conventional

RCaRC

Heat Pump

24 VAC Cooling transformer.

24 VAC Heating transformer.

Description

X X Common.

aux aux Auxiliary relay.

W1 O/B Conventional: Stage 1 heating relay.

Heat Pump: Changeover relay for heating (B) or

cooling (O)

W2 W1 Conventional: Stage 2 heating relay.

Heat Pump: 1st Stage auxiliary heat relay.

Y1 Y1 Conventional: Stage 1 cooling relay.

Heat Pump: Stage 1 compressor relay.

Y2 Y2 Conventional: Stage 2 cooling relay.

Heat Pump: Stage 2 compressor relay.

AS AS Discharge Air Sensor connection (1).

AS AS Discharge Air Sensor connection (2).

OS OS Outdoor Air Sensor connection (1).

OS OS Outdoor Air Sensor connection (2).

G G Fan relay.

T3 T3 TR20 Series Remote Sensor connection (1).

T4 T4 TR20 Series Remote Sensor connection (2).

T5 T5 TR20 Series Remote Sensor connection (5).

T6 T6 TR20 Series Remote Sensor connection (9).

T7 T7 TR20 Series Remote Sensor connection (7).

W3 W2 Conventional: Stage 3 heat or stage 4 cool relay.

Heat Pump: 2nd Stage auxiliary heat relay.

Y3 — Conventional: Stage 3 cooling relay.

HS HS Humidity Sensor connection (signal: 0-10 Vdc).

TR23-H connection (11)

HC HC

Humidity Sensor connection (common).

HP HP Humidity Sensor connection (power). TR23-H

connection (12)

M M Motion Sensor connection (1).

M M Motion Sensor connection (2).

Factory jumper between RC and RH for systems with one

transformer.

For changeover functional details, see Operation section.

HC connection is not needed when using a TR23-H sensor.

PRESS LOWER EDGE OF CASE TO LATCH.

M19609

Fig. 7. Mounting Thermostat on Subbase.

SETTING

Using Thermostat Keys

The thermostat keys are used to:

• set current time and day,

• program times and setpoints for heating and cooling,

• override the program temperatures,

• display present setting,

• set system and fan operation,

• perform simple configuration.

Mounting Thermostat on Subbase (Fig. 7)

With the subbase installed, mount the thermostat:

1. Engage the tabs at the top of the thermostat and subbase.

2. Swing the thermostat down.

63-2666—03 6

NOTE: Refer to Fig. 8 for keypad information.

Setting Temperature

Refer to Table 2 for the default temperature setpoints. See Programming section for complete instructions on changing the setpoints.

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