Honeywell T7047C User manual

INSTALLATION INSTRUCTIONS
62-3050—3
T7047C,G
Electronic Thermostats
and Remote Space Sensors
APPLICATION
The T7047C,G Electronic Thermostats and Remote
Space Sensors are used in Series 70 Control Systems
to provide modulating space temperature control.
SPECIFICATIONS
Models:
T7047C: 2-wire remote sensor for use with control
systems such as the T7100, T7300, W927, W960,
and W973.
T7047G: 2-wire remote sensor without internal
adjustment means, requires remote setpoint device
such as T7100, T7300, S963B, 7067B or T7080B.
Dimensions: See Fig. 1.
Temperature Sensor: Thermistor-resistor element.
Sensor Resistance:
For the following negative temperature coefficient (NTC)
devices, resistance decreases as temperature
increases (Fig. 8 and 9):
T7047C: 1420 ohms nominal at 75°F (24°C);
resistance changes 15 ohms for each 1°F (0.6°C)
temperature change.
T7047G: 710 ohms nominal at 75°F (24°C);
resistance changes 7.5 ohms for each 1°F (0.6°C)
temperature change.
Mounting: Mounts on wall or 2 x 4 in. vertical outlet box
with screws provided.
Accessories:
209649A Universal Cover Plate (taupe);
5-3/4 x 7-3/8 in. (146 x 187 mm).
209650A Universal Cover Plate (premier white);
5-3/4 x 7-3/8 in. (146 x 187 mm).
Fig. 1. T7047 dimensions in in. (mm).
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 the ratings given in the instructions and on
the product to make sure 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.
CAUTION
Electrical Shock or Equipment
Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
3-1/4
(83)
3-13/16
(97)
4-5/8
(117)
1-13/16 (46)
3-5/8 (92)
7/8 (22)
1-1/16 (27)
2-7/8 (73)
3/8
(10)
M17720

T7047C,G ELECTRONIC THERMOSTATS AND REMOTE SPACE SENSORS
62-3050—3 2
Location
Locate the thermostat or remote sensor about 5 ft (1.5m)
above the floor on an inside wall where it is affected by
freely circulating air at average room temperatures.
Mounting
1. Loosen the cover locking screw and remove the
thermostat cover.
2. Run wire to the selected location; thread wire
through the semicircular hole in the thermostat; and
make connections to the T7047 (see the
Wiring section).
3. Four mounting screws are provided, two self-
tapping type for wall mounting and two for outlet
box mounting. Select the proper screws for the
application.
4. If air drafts occur through the wall opening,
eliminate with suitable material.
5. Fasten the T7047 on the wall or outlet box with
screws through the thermostat mounting holes. See
Fig. 2.
NOTE: Connect sensor wires to T-T terminals on
the thermostat cover assembly.
6. Replace the cover and tighten the cover locking
screw.
Fig. 2. Mounting the T7047.
Wiring
CAUTION
Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
Fig. 3 through 7 show schematics and typical
connections. Also refer to instructions supplied with other
system components.
IMPORTANT
• All wiring must agree with applicable codes, ordi-
nances and regulations.
• To avoid electrical interference, which can cause
erratic performance, keep wiring runs as short as
possible and do not run thermostat wires adja-
cent to the line voltage electrical
distribution systems.
• Use shielded cable (Belden type 8762 or
equivalent for 2-wire and Belden type 8772 or
equivalent for 3-wire).
• The cable shield must be grounded only at the
controlled equipment case.
Fig. 3. Two T7047G Sensors providing a
temperature-averaging network for a T7100/Q7100
or T7300/Q7300 Thermostat/Subbase.
Fig. 4. Two T7047C Sensors and one T7047G Sensor
providing a temperature-averaging network for a
T7100/Q7100 or T7300/Q7300 Thermostat/Subbase.
THERMOSTAT
MOUNTING
TAB SLOT (2)
MOUNTING
TAB
(2 INSIDE
COVER)
MOUNTING
SCREW (2)
COVER
LOCKING
SCREW
OUTLET BOX
M17719
WALLPLATE
M3421
TT
Q7300
T
T
T7047G1000
T7047G1000
T
T
M3418
TT
Q7300
TT
T7047C
TT
T7047C TT
T7047G1000

T7047C,G ELECTRONIC THERMOSTATS AND REMOTE SPACE SENSORS
3 62-3050—3
Fig. 5. Four T7047C Sensors providing a
temperature-averaging network for a T7100/Q7100
or T7300/Q7300 Thermostat/Subbase.
Fig. 6. Five T7047G Sensors providing a
temperature-averaging network for a T7100/Q7100
or T7300/Q7300 Thermostat/Subbase.
Fig. 7. Nine T7047C Sensors providing a temperature-
averaging network for a T7100/Q7100
or T7300/Q7300 Thermostat/Subbase.
M3420
T T
TT
Q7300
T7047C
TT
T7047C
TT
T7047C
TT
T7047C
M3422
TT
Q7300
TT
T7047G
TT
T7047G
TT
T7047G
TT
T7047G
TT
T7047G
M3419
T T
TT
Q7300
T7047C
TT
T7047C
TT
T7047C
TT
T7047C
TT
T7047C
TT
T7047C
TT
T7047C
TT
T7047C
TT
T7047C

T7047C,G ELECTRONIC THERMOSTATS AND REMOTE SPACE SENSORS
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.
62-3050—3 B.B. Rev. 02-05
OPERATION AND CHECKOUT
Operation
The T7047C,G Electronic Thermostat or Remote Space
Sensor control element is a negative temperature
coefficient (NTC) thermistor. As the room temperature
increases, the resistance of the thermistor decreases.
The change in the thermistor resistance causes the
motor, system logic panel or system transmitter bridge
circuit to become unbalanced. As the electronic motor,
system logic panel or system transmitter circuits react to
rebalance the circuit, damper or valve movement, or
sequential staging of heating and/or cooling equipment
occurs.
Calibration
The T7047C,G Electronic Thermostat or Remote Space
Sensor is accurately calibrated at the factory. It cannot be
field calibrated.
Checkout
Allow the T7047C,G Electronic Thermostat or Remote
Space Sensor to stabilize to ambient conditions before
taking a resistance measurement. Measure nominal
resistance according to the values described in the
Specifications section. Measure the T7047 resistance in
accordance with the temperature curves. See Fig. 8 and
9.
Check operation of the complete control systems as
directed in the associated technical publications.
Fig. 8. T7047C Remote Sensor resistance
change with change in temperature.
Fig. 9. T7047G Remote Sensor resistance
change with change in temperature.
2000
1800
1600
1400
1200
1000
10 20 30 40 50 60 70 80 90 100
RESISTANCE
(OHMS)
1420 OHMS AT
75 F (24 C)
TEMPERATURE (DEGREES)
M4034
-10 0 10
20 30 40
C
F
1000
900
800
700
600
500
10 20 30 40 50 60 70 80 90 100
RESISTANCE
(OHMS)
710 OHMS AT
75 F (24 C)
TEMPERATURE (DEGREES)
M5354
-10 0 10
20 30 40
C
F
110