Honeywell AQ2000 User Manual

The

Aquatrol 2000 controller is the central component for a

single zone low pressure hot water heating system. It

FEATURES

provides self adaptive heating curve, optimum start/stop
operation, sequence control of two boilers, outside air
compensated mixed water control using a 3-port motorised
valve and pump, and domestic hot water control using a valve
and/or pump.

A wide range of compatible sensors, a remote unit, valves
and actuators complement the control system.

AQ2000

OPTIMISER/COMPENSATOR

CONTROLLER

PRODUCT DATA

• Digital control technology with easy-to understand

analogue installation adjustments

• Outside compensated control of low pressure hot

water heating system

• Multiple system applications

• Automatic system recognition from connected

sensors

• Fixed or self-adaptive heating curve (with optional

space sensor)

• Optimum Start/Stop (with optional space sensor) or

Boost on start-up (without space sensor)

• Room temperature compensation (with optional

space sensor)

• Heating time programme offering switching between

comfort and economy operation up to 6 times per
day, independently for each day of the week
(selectable economy off is also available)

• Manual override switch

• Domestic Hot Water Service (DHWS) time

programme offering up to 6 switching points per
day, independently for each day of the week

• Frost protection of the pipework , hot water cylinder

and the building fabric (with optional space sensor)

• Automatic summer heating mode changeover (user

adjustable)

• Automatic heating shutdown under minimal load

conditions

• Soft start to help prevent pipe expansion noise

• Service switch to assist installer on start-up and

technician during service

• Intelligent pump control with energy efficient pump

overrun

• Built-in user programme

• System temperature and parameter inquiry

• Optional remote unit providing space temperature

sensing, space temperature adjustment,
comfort/economy override switch and 3-hour
comfort extension button with confirmation LED

• Optional space sensor

• Holiday mode with programmable 1 to 99 day

holiday period and dynamic countdown display

• Automatic, DHWS only, Holiday or Standby

operation

• Minimum boiler flow temperature

• Control of one, or two boilers in sequence with

automatic lead boiler rotation

• LED's indicate control output status

EN0R 8441

AQ2000 OPTIMISER/COMPENSATOR CONTROLLER

Supply voltage

: 230 V~, +10% -15%, 50 Hz

Sensor accuracy

Humidity rating

: 0 to 90%

rh (non-condensing)

144 x 153 x 109 mm (with wiring centre)

BASIC SYSTEMS

SPECIFICATIONS

Power
Consumption

Relay ratings : Pumps and boilers:

Ambient
temperature
rating

: 8 W

3 A, 230 V~ @ 0.6 pf - 400,000
operations
Mixing valve:

0.25 A, 230 V~ @ 0.4 pf - 1,000,000
operations

: Water sensors: 20°C to 90°C ±2 K

Outside sensor: -20°C to +20°C ±2 K
Room sensor: 10°C to 25°C ±0.5 K

: 0 to 50°C

System 1

Boiler control for radiator systems

❑ DHWS priority control when DHWS sensor connected.
❑ Optimisation and self-learning heating curve when

optional space sensor or remote unit connected.

❑ One or two boiler control in sequence.

Storage/shipping
temperature

Electromagnetic
compatibility

Protection class : IP40 (with base fitted and when installed

Dimensions
(w x h x d)

Panel cut-out
(w x h)

Weight : 600 g

: -30°C to +70°C

: Emissions to EN55014

Susceptibility to EN50082-1

to EN60529)

: 144 x 96 x 105 mm (with standard base)

: 138 x 92 mm

System 2

Boiler and mixing valve control for radiator or underfloor
heating systems

❑ Versatile DHWS control when sensor connected.

Separate or combined operation available. Combined
can be shifting priority or parallel operation. (see DHWS
Operation on page 3)

❑ Optimisation and self-learning heating curve when

optional space sensor or remote unit connected.

❑ One or two boiler control in sequence.
❑ Continuous temperature boiler loop

EN0R 8441 2

System 3

DHWS OPERATION

Mixed flow control for radiator or underfloor heating systems.

❑ DHWS separate when DHWS sensor connected.
❑ Optimisation and self-learning heating curve when

optional space sensor or remote unit connected.

System 4

Optimiser control for systems with existing controls and
requiring optimisation only.

❑ DHWS separate when DHWS sensor connected.

AQ2000 OPTIMISER/COMPENSATOR CONTROLLER

Key

P1 = Heating pump
P2 = DHWS pump
B1 = Boiler 1
B2 = Boiler 2
T1 = Space sensor/Remote Unit

Separate DHWS

The DHWS operation is completely independent and has no
effect on the demand for heat from the boiler(s). This is
useful when DHWS is being supplied from a separate heat
source. The DHWS output is active when the DHWS
temperature falls 5 K below the DHWS setpoint.

Combined DHWS

There are three variants for combined DHWS; DHWS
priority, shifting priority and parallel operation. In all three
cases a demand for DHWS occurs when the DHWS
temperature falls 5 K below the DHWS setpoint.

1. DHWS Priority

In heating circuits with no mixing valve (and no mixed flow
temperature sensor), the DHWS has priority over the heating.

T2 = Mixed flow water sensor
T3 = Outside sensor
T4 = DHWS sensor
T5 = Boiler water sensor
M = Motor/Actuator

2. DHWS Shifting Priority

In heating circuits with a mixing valve where the boiler
temperature is less than 10 K above the DHWS setpoint the
mixing valve will be closed giving DHWS priority. If there is
extra heat available and the boiler temperature is more than
20 K above the DHWS setpoint, the mixing valve will be
controlled at the calculated setpoint. The mixed water
temperature setpoint is reduced when the boiler temperature
lies between these two values.

3. DHWS Parallel

In heating circuits with a mixing valve the heating circuit will
operate normally during a demand for DHWS.

EN0R 84413