Honeywell T6580 PRODUCT SPECIFICATION SHEET

T6580

FAN COIL CONTROLLER

PRODUCT SPECIFICATION SHEET

30

20

10

DESCRIPTION

A pleasing and modern appearance makes the T6580 ideal
for living quarter applications, in particular offices and hotels.

In all versions, the control is Proportional + Integral (P+I).
This ensures accurate temperature control in all operating
conditions.

The controller is suitable for mounting on a fan-coil chassis or
for wall mounting.

In 2-pipe plants the summer/winter switching can be activated
by a central contact, controlled automatically through a
connected thermostat or by a sensor installed on the pipe
near the fan coil.

There are two pre-set room regulating levels: Comfort and
Economy, to which two temperature levels are linked; the
selection of which can be made through the room unit or by
digital inputs.

The sensor for the temperature regulation is located inside
the room unit and is overridden if the optional remote sensor
is fitted.

Commands available: set-point configuration knob, fan speed
knob, push button for operating mode setting; push button for
summer/winter switching (Economy mode and summer/winter
switch buttons are not included on the Lite model).

FEATURES

• 2-pipe or 4-pipe fan coil applications

• Installer setup mode allows 11 parameters to be

changed easily on-site

• Proportional + integral digital control regulator

• Heating / cooling sequence and supplementary-

heating with electrical resistance heater

• Electrical resistance / cooling sequence

• Cooling / cooling sequence

• Ventilation only

• Manual or automatic summer / winter switching

• Automatic 3-speed fan control or manual override

• Selectable valve actuators: ON-OFF, PWM

• Actuator voltage: 230 Vac

• Digital inputs: water thermostat, change of season,

economy, window contact

• Analogue inputs: room temperature, inlet water
temperature

• Regulator voltage: 230 Vac, 50/60 Hz

• Destratification cycle

• Filter clean timer

• CE certification

GENERAL INFORMATION

The T6580 microprocessor controls were designed to
regulate heating and/or cooling within a room air-conditioning
systems. The T6580 regulates the water valves, the fan
speed, and the electrical resistance heater (where installed),
in 2-pipe and 4-pipe fan coil systems.

Table 1. Ordering codes for the T6580 FCU Controller:

Model Description

T6580A1008

T6580A1016 LITE FCU Controller 2/4 Pipe

FCU Controller 2/4 Pipe with S/W

switch & Economy function

1 EN0H8560UK07 R0

RFC BASIC FAN COIL CONTROLLER

DESCRIPTION

INPUTS AND OUTPUTS

Digital Inputs

PRESENCE or TIMED PROGRAM:

The open contact indicates a presence in the room (room
occupied) and the set point changes from economy to
comfort. This contact can also be linked to an external
timer system.

WINDOW:

The closed contact indicates that the window is open. This
causes the valve(s) to close and the fan to stop (energy
saving function). The anti-freeze protection function is
automatically activated, with 4 °C as default.

SUMMER / WINTER SWITCHING:

A closed contact indicates that warm water is flowing
through the pipes. This automatically changes the control
from summer to winter mode. NB that the water
temperature sensor can also be connected as an
alternative for this feature to operate.

WATER TEMPERATURE THERMOSTAT:

A thermostat can be installed at the water outlet of the heat
exchanger. This thermostat will automatically detect the
presence of warm water in the system during the winter
heating mode. The fan cannot start until warm water is
detected. The temperature of the water must be set on the
thermostat itself.

C) Sensor set to enable both functions: In 2-pipe
systems the sensor detects the supply water temperature
and determines the summer or winter function mode. The
fan function consent during the winter operating mode is
given with a configurable delay time set in Parameter 24.

Analogue and digital outputs

FAN:

Fan speed control, from one to three speeds. A 230 Vac
output, 50 Hz .Max 1.25 (3 peak)A.

HEATING VALVE:

Choice of a 230 Vac, 0.8 A command module for maximum
four on-off or thermal actuators.

COOLING VALVE:

Choice of a 230 Vac, 0.8 A command module for maximum
four on-off or thermal actuators.

Analogue Inputs

RETURN AIR TEMPERATURE SENSOR:

When installed, this sensor has priority over the room unit
internal sensor. The sensor is positioned at the air intake of
the fan coil and is used as alternative to the room sensor.

WATER TEMPERATUR SENSOR:

This sensor can be set to either switch the summer / winter
mode, or to enable fan operation, or both

A) Summer / winter switching: The sensor measures
water supply temperature. When this drops below the limit
value set in Parameter 14, the summer function mode is
activated. When the water supply temperature is above the
limit set in Parameter 15, the winter function mode is
activated. Supply water between the upper and lower limits
means that the thermostat stays OFF.

B) Enabling fan function: In 2 and 4-pipe fan coils the
sensor is installed on the return pipe after the heating coil.
This enables the fan function. Parameters 14 and 15 set
the temperature that enables the fan to start.

2 EN0H8560UK07 R0

RFC BASIC FAN COIL CONTROLLER

TECHNICAL FEATURES

BASIC
Regulation range 10…30 °C
Voltage 230 Vac, 50/60 Hz

Outputs (warm and cold
water)

Selector or Keys

Temperature levels Comfort / Economy Pushbutton

Seasons Summer/Winter Pushbutton

Set point Temperature: 10,…30 °C Dial

Analogue Inputs

Room Temperature Air intake probe (remote) NTC10K
Water Temperature Contact or immersion probe NTC10K

Digital Inputs

Window opening
Presence/timed program
Proportional band Selectable from 1 to 5 °C
Dead Zone From 0 to 4 °C
Applications Fan only
2-pipe system with/without electrical

4-pipe system with/without electrical

Housing Single housing
Automatic valve commands
Local Communication No
Centralized Communication No

Table 2. Technical Features

PWM
On-Off

Fan Auto-0-1-2-3

Consent thermostat/summer-winter

switching/anti-condensation pump

resistance

resistance

5-position selector
dial

9
9
9
9
9

9
9

9

9
9
9
9

9

9
9
9
9
9
9

9

9
9

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RFC BASIC FAN COIL CONTROLLER

FAN FUNCTION

The fan can function provided the consent thermostat is
satisfied or the water temperature probe detects a
temperature above the fixed value, where these inputs are
present.

The fan is controlled through the 5 position-speed selector
dial.

0 = fan OFF. In this position the valve is also closed.

Only the anti-freeze function is activated.

1 = always 1st fan speed

2 = always 2nd fan speed

3 = always 3rd fan speed

FAN SPEED

3

DEAD BAND

2

1

COOLING PROP. BANDHEATING PROP. BAND

DESTRATIFICATION CYCLE

When the room probe is positioned at the air intake, and
the setpoint is reached, the fan cycles according to the time
settings made in Parameters 20 and 21 to enable correct
reading of the room temperature.

FAN START DELAY DURING THE WINTER
SEASON

During the heating action, the fan switches from OFF to the
first speed, after the delay programmed in Parameter 22.

ELECTRICAL RESISTANCE

When using electrical resistance heater, (i.e., instead of the
water heating system), the fan is started after the delay set in
Parameter 23, starting as soon as the resistance heater was
turned on. When the resistance heater turns off the fan
continues to operate for the time set in Parameter 24.

0

WINTER SETPOINT SUMMER SETPOINT

TEMPERATURE

Fig. 1 Fan speed sequence

In the AUTO function, the fan and the valves are
automatically activated. The fan output varies as a function
of the difference between the room temperature and the set
point.

Auto Position: the fan operates with the speed determined
by the regulator.

In the heating mode, the fan will have speed 0 when Tamb
> (set point ).

1st speed when (set point -30% of the BP) <Tamb < (set
point).The minimum time at this speed is 2 minutes in
normal conditions.

2nd speed when (set point -90% of the BP) <Tamb < (set
point –30% of the BP).The minimum time at this speed is 2
minutes in normal conditions.

3rd speed when Tamb < (set point –90%).The minimum
time at this speed is 2 minutes in normal conditions.

If a variation of more than the BP value occurs between the
set point and the actual temperature, the minimum length
of time in any one state is reduced to 5 seconds.

If the action is cooling, fan control will be opposite to that
used during the heating action.

During the cooling cycle function, and if the set point is
satisfied, the fan will continue to operate at speed 1 for 3
minutes, and will then stop.

HEATING & COOLING
OUTPUT FUNCTION

Valve Opens

100%

0%

2-PIPE FAN COIL WITH AN ON-OFF and PWM
ACTUATOR:

Fig. 2 :

2-PIPE FAN COIL WITH AN ON-OFF & PWM ACTUATOR

The set point is set to the upper point (to the lower point for
cooling) of the proportional band, so the valve is closed
when the temperature exceeds the set point.

The valve opening percentage is regulated by the P+I algorithm.

X

pH

Set

Temperature (

o

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4