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
External 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.
5
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