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Operation, Check-out, Caution – Honeywell T6380 User Manual

Page 5: T6380 - operation

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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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