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Honeywell T6380 User Manual

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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 
. 
T6387A 
AQUASTAT 
WHT 
L2(NEUTRAL)
L1(HOT) 
Med (BLU) 
Hi (BRN) 
Lo (RED) 
BLK 
SYSTEM 
FAN
Heat 
Off 
Cool 
Heat (ORG) 
Cool (YEL) 
To internal heat/cool 
circuits 
HI 
MED 
LO 
FAN 
. 
W 
R 
B 
W 
R 
B 
T6381B 
1
WHT 
(BLU) 
(BRN) 
(RED) 
BLK 
SYSTEM 
FAN 
Auto 
Off 
On 
(VIO) 
FAN 
Cool (YEL) 
Heat (ORG) 
W 
R 
B 
HI 
MED 
LO 
TO HEAT/ COOL 
VALVE 
TO SUPPLEMENTARY 
HEAT 
TOHEAT/COOL  
VALVE  
Ext ernal jumper 
L1(HOT)  L2(NEUTRAL) 
! 
CAUTION 
1. Disconnect power supply before connecting
Fig. 8a – T6387A: 2-pipe, cooling only on–auto fan 
wiring to prevent electrical shock and equipment
 damage. 
T6387A 
2. Never jumper the supply wires or actuator terminals
 even temporarily.  This may damage the thermostat. 
WHT 
L2(NEUTRAL)
L1(HOT) 
(BLU) 
(BRN) 
(RED) 
BLK 
SYSTEM 
FAN 
Auto 
Off 
On 
(VIO) 
Cool (YEL) 
Heat (ORG) 
External jumper 
TO COOLING 
VALVE 
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 con­
trolled by the FAN switch.  Continuous (
ON
) or intermittent 
HI 
FAN
MED 
LO 
(
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. 
Fig. 8b – T6387A: 2-pipe, heating only on–auto fan 
Models T6381B,: T6383B 
• SYSTEM: HEAT - OFF - COOL 
Set the SYSTEM switch to HEAT.  Rotate the
T6387A 
thermostat knob clockwise to energize the heating 
WHT 
(BLU) 
(BRN) 
(RED) 
BLK 
SYSTEM 
FAN 
Auto 
Off 
On 
(VIO) 
Cool (YEL) 
Heat (ORG) 
valve and/or fan (fan auto/cycled mode).  The 
system LED on the thermostat will light when the 
heating circuit is energized. 
TO HEATING 
VALVE 
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. 
HI 
FAN
MED 
LO 
Model T6387A 
• SYSTEM: ON -AUTO - OFF 
External jumper 
• Set the SYSTEM switch to ON. The valve will 
operate on heating or cooling cycle depending on 
L1(HOT) 
L2(NEUTRAL) 
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. 
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