Electronic Fan Coil Thermostats
APPLICATION
The T6380 series of electronic fan coil thermostats provide
precision line voltage control of fan-forced Heating, Ventilating and Air Conditioning equipment. Models are available for
cooling-only, manual heat-cool changeover, or remote heatcool changeover systems. Hydronic source heat-cool
systems may be two or four-pipe configuration with 0, 1, or 2
valves. Fan control options include constant, cycled, or userselectable "On-Auto" operation. Manual fan speed selection
is standard. All models feature an “Off” switch.
T6380 Series
PRODUCT DATA
FEATURES
• Electronic temperature sensing provides energy-
efficient, precision operation for maximum comfort.
• Contemporary white sculpted styling.
• Vertical or horizontal mounting configurations.
• Adjustment ranges 55° to 90°F or 13° to 32°C.
• Easy-to-use set point knob.
• LED system status indicator. "OFF" de-energizes all
connected loads.
• Three level fan speed selection.
• Constant, cycled, or on-auto selectable fan operation
available.
• Models for manual or remote heat-cool changeover,
heating-only, or cooling-only systems.
• Models for 2 or 4-pipe systems.
• Rugged molded thermoplastic housing with captive
mounting screws, mounts on single-gang NEMA-
standard (U.S.) electrical box.
• Screw terminal block connections.
• Suitable for inductive-rated loads such as valves,
relays, contactors and fans.
• Range stops and cover locking kit available.
• UL Listed. CSA Certified.
Contents
Specifications .................................................................. 2
Ordering Information ....................................................... 2
Installation ....................................................................... 3
Wiring .............................................................................. 3
Operations .................................................................... 5
Check-out ..................................................................... 5
M.O'D. 8/98 © Honeywell Ltd.—Honeywell Ltée. 1998 Printed in Canada Form Number 95C-10758
T6380 - SPECIFICATIONS, ORDERING INFORMATION
SPECIFICATIONS
MODELS:
Fan Coil System
2-pipe System
• Cooling only
• Heating only
2-pipe Heat-Cool
• Manual Change/Over
• Seasonal, auto C/O
• Seasonal, auto C/O
with aux. electric heat
4-pipe Heat-Cool
• Manual C/O
Electrical Ratings:
T6380 Series - Power Supply: 110-130 or 208-277 Vac
T6381, T6387 - Output Rating, cycled (“Auto”) fan control
* Equivalent to NEMA 1/8 horsepower rating for a hermetically-sealed
T6383 – Output Rating, constant fan operation
Thermostat (Heat and Cool outputs):
Fan (Air Handler):
50-60 Hz
Full Load Amps**
Locked Rotor
** Equivalent to NEMA 1/4 horsepower rating for a hermetically-sealed
+10/-15%, 50-60 Hz.
50-60 Hz 120 V 208 V 230 V 277 V
Full Load Amps* 3.8 2.1 1.9 1.6
Locked Rotor 22.8 12.6 11.4 9.5
Pilot Duty 125 VA
motor such as a compressor. Allowable connected load must be
determined by adding nameplate full load and locked rotor (inrush) ratings
of all loads.
50-60 Hz 120 V 208 V 230 V 277 V
Full Load Amps 3.8 2.1 1.9 1.6
Locked Rotor A 22.8 12.6 11.4 9.5
Pilot Duty 125 VA
Resistive (heat only)
110-130V
motor. Allowable load must be determined from fan nameplate
ratings .
† North American national electrical codes require all ungrounded
conductors to electric resistance heating to be broken at the thermostat
OFF setting. The 208V and 230V resistive ratings are not UL approved.
The 230V rating is site-approveable in Canada on 416V 4-wire Wye
distributed systems. The non-inductive rating for 230V “a.c. mains”
with one ungrounded conductor is 6.0A.
3-Speed Fan Operation
Constant
T6383A T6381A T6387A
Fig. 2a Fig. 5a Fig. 8a
T6383A T6381A T6387A
Fig. 2b
T6383B
Fig. 3
T6383A
Fig. 2c
T6383B
Fig. 4b Fig. 7b
T6383B
Fig. 4a Fig. 7a
10.0 A
5.8 3.2
34.8 19.2
Cycled
Fig. 5b Fig. 8a
T6381B N/A
Fig. 6
T6381A
Fig. 5c
T6381B
T6381B
N/A
208 V
220-240V
N/A 5.6
2.9
17.4
On-Auto
T6387A
Fig. 8c
N/A
N/A
277 V
14.4
2.4
Operating range:
32 to + 104 F [0 to +40 C], 5 to 95% RH, non-condensing.
Performance Specifications:
Precision: ±1°F temperature swing [0.9°C differential].
Accuracy: 2°F [1°C] droop with 4 A load.
Dimensions:
See Fig. 1 - Nominal Dimensions.
Mounting:
Direct mounting on single-gang NEMA 2" x 3" flush-mount
or 2" x 4" surface-mount electrical box, or on 4" x 4" box
Models available for vertical or horizontal mount.
Wiring Connections:
Screw terminal block suitable for 1 – 14 AWG, 2 – 18 AWG,
2
or 1 – 1.5 mm
copper wire.
Approvals:
CSA Certified LR1322
Underwriters Laboratories Listed E47434.
Accessories:
272824A-T6380 Range stop/cover locking kit.
272827A-T6380 replacement cover with Cool-Warmer
Fig. 1 — Nominal dimensions in inches and
millimetres
ORDERING INFORMATION
Before ordering please determine the following:
1. The body type: 2-way or 3-way
2. The actuator voltage : 24V/50-60Hz
3. The pipe fitting, size, and flow capacity rating (Cv) required.
4. Order Specification Number
5. Accessories, if desired.
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 Home and Building Control Sales Office (please check the white pages of your phone directory).
2. Honeywell Limited, 155 Gordon Baker Rd., North York, ON M2H 3N7.
In U.S.A. - Honeywell Inc., 1885 Douglas Drive North, Minneapolis, Minnesota 55422-4386 (612) 951-1000. International Sales and Service
Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain,
Taiwan, United Kingdom, U.S.A.
2
T6380 - INSTALLATION, WIRING
)
)
r
(
)
)
INSTALLATION
MOUNTING:
Mount the thermostat on an inside wall 4’ to 5' [1.5 m] above
the floor. Do not mount where thermostat can be affected by
drafts, radiant heat from the sun, or other sources of heat.
T6380's mount on NEMA standard 2"x3" single gang flush or
2"x4" surface mount electrical box, or on 4"x4" box with mud
ring adaptor (not provided).
WIRING
3Internal schematic and external wiring connections are
shown in Fig. 2a through Fig. 8c. Wiring connections may be
made to the 8 position screw terminal block with 1- 14 AWG,
or 2- 18 AWG, solid or stranded copper wires.
Fig. 2a – T6383A for 2-pipe, constant fan, cooling only
T6383A
FAN
BLK
L1(HOT)
Off
WHT
L2
(NEUTRAL)
Cool (YEL)
Heat (ORG)
3
(BRN)
(BLU)
2
(RED)
1
(VIO)
TO COOLING
VALVE
External jumper
HI
MED
FAN
LO
Fig. 2c – T6383A: 2-pipe, heat/cool, seasonal auto-changeover,
constant fan
.
T6383A
AQUASTAT
W
R
B
FAN
TOHEAT/COOL
VALVE
1
BLK
L1(HOT)
FAN
Off
L2
(NEUTRAL)
Cool (YEL)
Heat (ORG)
WHT
3
(BRN) HI
2
(BLU) MED
(RED) LO
1
(VIO)
1
External jumper
Fig. 3 – T6383B: 2-pipe, heat/cool, manual changeover, constant
fan
T6383B
SYSTEM
Cool
Off
Heat
Cool (YEL)
Heat (ORG)
FAN
Hi (BRN)
Med (BLU)
Lo (RED)
HI
MED
LO
TOHEATING/
COOLING
VALVE
External jumpe
FAN
Fig. 2b – T6383A for 2-pipe, constant fan, heating only
T6383A
FAN
Off
BLK
L1(HOT)
(NEUTRAL)
L2
Cool (YEL)
Heat (ORG)
WHT
3
(BRN)
(BLU)
2
(RED)
1
(VIO)
TO HEATING
VALVE
HI
MED
LO
External jumper
FAN
BLK
L1(HOT
WHT
L2(NEUTRAL
To internal heat/cool
circuits
Fig. 4a – T6383B: 4-pipe, heat/cool, manual changeover,
constant fan
T6383B
SYSTEM
BLK
L1(HOT
Cool
Off
Heat
WHT
L2
NEUTRAL
Cool (YEL)
Heat (ORG)
FAN
Hi (BRN)
Med (BLU)
Lo (RED)
To internal heat/cool
circuits
TO COOLING
VALVE
TO HEATING
VALVE
HI
MED
LO
FAN
3
T6380
/
L2(NEUTRAL)
L1(HOT)
SYSTEM
FAN
Heat
Off
Cool
Cool (YEL)
FAN
TO HEATING/COOLING
VALVE
Fig. 4b – T6383B: 2-pipe, heat/cool, auto changeover, with aux.
electric heat, constant fan
T6383B
SYSTEM
Cool (YEL)
Cool
Off
Heat
BLK
Heat (ORG)
FAN
Hi (BRN)
Med (BLU)
Lo (RED)
WHT
L2(NEUTRAL)L1(HOT)
To internal heat/cool
circuits
HI
MED
LO
.
W
.
R
B
W
R
B
TO HEAT/ COOL
VALVE
TO SUPPLEMENTARY
HEAT
FAN
Fig. 5a – T6381A: 2-pipe, cooling only, cycled fan
T6381A
FAN
Cool (YEL)
L1 (HOT)
Fig. 5c – T6381A: 2-pipe, heat/cool, auto-changeover, cycled fan
AQUASTAT
W
R
B
HI
MED
LO
FAN
L2 (NEUTRAL)
L1 (HOT)
FAN
Off
T6381A
Cool (YEL)
Heat (ORG)
3
(BRN)
2
(BLU)
(RED)
1
WHT
(VIO)
External jumper
TO HEATING
COOLING VALVE
Fig. 6 – T6381B: 2-pipe, heat/cool, manual changeover, cycled
fan
T6381B
.
Heat (ORG)
(BRN)
Off
3
2
(BLU)
(RED)
1
WHT
HI
MED
LO
L2
(NEUTRAL)
BLK
(VIO)
External jumper
TO COOLING
VALVE
Fig. 5b – T6381A: 2-pipe, heating only, cycled fan
T6381A
FAN
Cool (YEL)
L1 (HOT)
HI
MED
FAN
LO
L2
(NEUTRAL)
External jumper
BLK
Off
Heat (ORG)
(BRN)
3
2
(BLU)
(RED)
1
WHT
(VIO)
FAN
External jumper
BLK
Heat (ORG)
(BRN)
(BLU)
(RED)
WHT
HI
MED
LO
Fig. 7a – T6381B: 4-pipe, heat/cool, manual changeover, cycled
fan
.
SYSTEM
Cool
Off
Heat
T6381B
Cool (YEL)
Heat (ORG)
FAN
(BRN)
(BLU)
(RED)
TO COOLING
VALVE
TO HEATING
VALVE
HI
MED
LO
FAN
TO HEATING
VALVE
4
BLK
L1(HOT)
WHT
L2(NEUTRAL)
T6380 - OPERATION
(
)
)
)
Fig. 7b – T6381B: 2-pipe, heat/cool, auto-changeover, cycled fan Fig. 8c – T6387A: 2-pipe, heat/cool, auto-changeover, on–
with aux. heat auto fan
.
HI
MED
LO
W
.
R
B
W
R
B
FAN
BLK
Cool
Off
Heat
SYSTEM
WHT
L2(NEUTRAL)L1(HOT)
T6381B
Cool (YEL)
Heat (ORG)
FAN
Hi (BRN)
Med (BLU)
Lo (RED)
To internal heat/cool
circuits
Fig. 8a – T6387A: 2-pipe, cooling only on–auto fan
T6387A
SYSTEM
On
Off
Auto
BLK
L1(HOT
WHT
L2
Cool (YEL)
Heat (ORG)
FAN
(BRN)
(BLU)
(RED)
(VIO)
External jumper
NEUTRAL
Fig. 8b – T6387A: 2-pipe, heating only on–auto fan
T6387A
SYSTEM
On
Off
Auto
BLK
L1(HOT) L2(NEUTRAL
WHT
Cool (YEL)
Heat (ORG)
FAN
(BRN)
(BLU)
(RED)
(VIO)
TO HEATING
VALVE
HI
MED
LO
External jumper
FAN
TO HEAT/ COOL
VALVE
TO SUPPLEMENTARY
HEAT
TO COOLING
VALVE
HI
MED
LO
FAN
SYSTEM
On
Off
Auto
BLK
L1(HOT) L 2(NEUTRAL)
CAUTION
!
1. Disconnect power supply before connecting
wiring to prevent electrical shock and equipment
damage.
2. Never jumper the supply wires or actuator terminals
even temporarily. This may damage the thermostat.
OPERATION
As the temperature changes, the thermostat makes to
open a valve and/or power a blower to provide heating or
cooling. The speed at which the air is circulated is controlled by the FAN switch. Continuous (
AUTO) fan operation is determined by model number.
(
CHECK-OUT
Turn power on. Check out operation according to the
SYSTEM switch present.
• SYSTEM switch OFF de-energizes valve and fan
circuits.
Models T6381B,: T6383B
• SYSTEM: HEAT - OFF - COOL
Set the SYSTEM switch to HEAT. Rotate the
thermostat knob clockwise to energize the heating
valve and/or fan (fan auto/cycled mode). The
system LED on the thermostat will light when the
heating circuit is energized.
Set the SYSTEM switch to COOL. Rotate the thermo
stat knob counter-clockwise to energize the cooling
valve and/or fan (fan auto/cycled mode). The
system LED on the thermostat will light.
Model T6387A
• SYSTEM: ON -AUTO - OFF
• Set the SYSTEM switch to ON. The valve will
operate on heating or cooling cycle depending on
whether hot or chilled water is being supplied. The
fan will run continuously.
Set the SYSTEM to AUTO. The fan will cycle with the
heating or cooling operation.
WHT
T6387A
Cool (YEL)
Heat (ORG)
FAN
(BRN)
(BLU)
(RED)
(VIO)
W
R
B
HI
MED
LO
1
External jumper
ON) or intermittent
AQUASTAT
TOHEAT/COOL
FAN
VALVE
5
Models: T6381A; T6383A
• SYSTEM: HI-OFF-MED-LO
• Set the SYSTEM switch to HI. Rotate the thermostat
knob clockwise to energize the heating\cooling valve
and/or fan ( constant or cycled fan). The system
LED on the thermostat will light when the heating or
cooling circuit is energized.
SETTING:
The T6380 temperature scale is marked 55 to 90°F or 13 to
32°C, depending on the model. Set the dial indicator marker
to the desired temperature.
CALIBRATION:
T6380 thermostats are accurately calibrated at the factory
under controlled conditions. Do not attempt to field calibrate
this device.This thermostat has line voltage connections.
T6380
Home and Building Control In U.S.A.
Honeywell Ltd. Honeywell Inc.
155 Gordon Baker Road 1985 Douglas Drive North
North York, Ontario M2H 3N7 Golden Valley, MN 55422-3992
Printed in Canada
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