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Siemens QAA75.611 User Manual

Siemens QAA75.611
221 pages
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Edition 1.0
Controller series A
CE1U2355en_02
23. November 2007
Siemens Schweiz AG
HVAC Products
Albatros
2
Heat pump controller
User manual
RVS61.843
AVS75..
AVS37..
QAA75..
QAA78..
QAA55..

Table of Contents

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Siemens QAA75.611 Specifications

General IconGeneral
Protection ClassIP30
Number of Channels1
TypeRoom controller
Power Supply24 V AC/DC
Temperature Range0 to 50 °C
Operating Temperature0 to 50 °C
Humidity Range0 to 95 %
MountingWall mounting
Sensing ElementNTC
Setpoint Setting Range5 to 30 °C
Contact ConfigurationSPDT
StandardsEN 60730
Voltage Rating24 V

Summary

2 Safety notes

3 Mounting and installation

3.2 Heat pump controller RVS61.843

Engineering, mounting, dimensions, and drilling plan for the main unit.

3.2.1 Connection terminals RVS61.843

Details of connection terminals and their markings for the RVS61.843.

3.4 Operator unit AVS37.294

Mounting method, connections, dimensions, and panel cutout for the operator unit.

3.5 Operator unit AVS37.390

Connections and dimensions for the AVS37.390 operator unit.

3.6 Room unit QAA55…

Engineering, mounting, connections, dimensions, and drilling plan for the QAA55 room unit.

3.7 Room unit QAA75…

Engineering, mounting method, and connections for the QAA75 room unit.

3.8.2 Room unit QAA78.610

Engineering, mounting, connections, radio connection, and dimensions for the QAA78 room unit.

3.8.3 Wireless outside sensor AVS13.399

Mounting method, connections, and radio connection for the wireless outside sensor.

4 Commissioning

4.1 Heat pump controller RVS61.843

Steps for commissioning the RVS61.843, including checking LED status.

5 Handling

5.1 QAA75.. / QAA78… / AVS37..

Operation of room units and operator units, including descriptions of operating elements.

5.1.1 Operation

Details of operating elements for room units and operator units, explaining their functions.

Selecting space heating mode

How to switch between operating modes like Automatic and Continuous for space heating.

Selecting cooling mode

How to select and operate the cooling mode, including its characteristics.

Selecting DHW heating mode

How to activate and deactivate DHW heating mode, including DHW push function.

Adjusting the room temperature setpoint

How to adjust the comfort and reduced room temperature setpoints using the control knob.

Manual defrost of HP / reset

How to perform manual defrost or reset functions using the RESET button.

5.1.2 Programming the QAA75... / QAA78… / AVS37..

Principles of programming settings via menus and operating lines, with an example.

5.1.3 User levels

How to access different user levels (Enduser, Commissioning, Heating engineer) for settings.

5.1.4 Overview of the settings

A comprehensive table outlining available settings, operating levels, and default values.

6 The settings in detail

6.2 Operator section

Details on operator section settings including language, info, operation lock, and programming lock.

6.3 Radio links

Procedures for binding wireless devices, testing radio links, and listing RF devices.

Binding

Process of assigning wireless peripheral devices to the basic unit for system commissioning.

6.4 Time programs

Setting up switching programs for heating circuits and DHW, including preselection and default values.

6.6 Heating circuits

Functions available for individual heating circuits, including operating mode and setpoints.

Heating curve

Adjusting heating curves to match flow temperature to weather conditions for optimal heat output.

Heating curve slope

Adjusting curve steepness to influence flow temperature based on outside temperatures.

Boost heating

Accelerating heating to reach new setpoints faster, shortening heat-up times.

Quick setback

Function to reduce heating temporarily, with options for room sensor or time-based control.

Optimum start / stop control

Optimizing start/stop times to reach setpoints efficiently.

Raising the Reduced setpoint

Adjusting the reduced setpoint to prevent excessive cooling and shorten heat-up times.

Floor curing function

Controlled drying of floors using temperature profiles, with automatic or manual settings.

6.7 Cooling circuit 1

Operating cooling circuits, including mode selection, setpoints, and release criteria.

Operating mode

Selecting the operating mode (Off, Automatic) for cooling circuits.

Cooling curve

Determining required flow temperature for cooling based on outside temperature and defined points.

Cooling limit at OT

Releasing or locking cooling based on composite outside temperature thresholds.

Flow temperature setpoint limitations

Defining minimum flow temperature limits for cooling based on outside temperatures.

Room influence

Compensating room temperature deviations for accurate control, with different methods.

Room temperature limitation

Deactivating cooling pump if room temperature falls below setpoint, considering summer compensation.

Mixing valve control

Settings for mixing valve decrease, actuator type, switching differential, and running time.

Dewpoint monitoring

Preventing condensation by controlling flow temperature based on humidity and dewpoint.

Buffer storage tank / primary controller

Configuring buffer storage tanks and primary controllers for cooling circuits.

6.8 DHW

Release

Enabling DHW heating based on 24h/day, time programs, or DHW release.

Charging priority

Setting priority for DHW charging over space heating based on heat source capacity.

Legionella function

Settings for periodic or weekday legionella function to prevent bacteria growth.

6.9 Hx pumps

With buffer

Defining if Hx circuits can draw heat from the buffer storage tank.

With prim contr/system pump

Determining if primary controller/system pump impacts the consumer group.

6.11 Primary controller / system pump

Primary controller / system pump

Configuring primary controller or system pump installation relative to the buffer storage tank.

6.12 Heat pump

Condenser pump

Settings for condenser pump operation related to frost protection, temperature requests, and compressor activity.

Source pump

Functions preventing low source temperatures and ensuring source temperature stability.

Compressor control in plants without buffer or combi storage tank

Compressor control based on return temperature and switching differentials.

Compressor control in plants with buffer or combi storage tank

Compressor control using buffer/storage tank sensors and minimum running times.

Compressor settings

Settings for compressor run times, switch-off temperatures, and startup delays.

Keep compr run time min

Observing minimum compressor running time when heat request is stopped.

Compressor run time min

Minimum operating time for the compressor after switching on.

Compressor off time min

Minimum time the compressor remains switched off.

Switch-off temp max

Switching off the compressor if flow or return temperature exceeds maximum.

Red switch-off temp max

Reduced switch-off temperature for DHW charging or forced buffer charging.

Compressor 2

Settings for locking compressor stage 2 during DHW charging and release conditions.

Reset integral stage 2

Releasing second stage based on integral values and heat deficits.

Compr sequence changeover

Automatic changeover of compressors to equalize operating hours.

Electric immersion heater in the flow

Control of electric immersion heaters using relay outputs and sensors.

Use electric flow

How the electric immersion heater is used in different modes like substitute or emergency operation.

Substitute and complement to heat pump operation

Conditions where electric immersion heater use has no impact or is complemented by HP operation.

Locking time electric flow

Time delay for switching on the electric immersion heater after compressor startup.

Release integral electric flow

Releasing stages of electric immersion heater based on integral values and heat deficits.

Heat pump protection during DHW charging

Protection measures for the heat pump during DHW charging, including charging attempts and temperature monitoring.

General parameters

Compensation for heat deficits and excess heat, with behavior during floor curing.

Compensation heat deficit

Compensating for heat deficits and excess heat, with specific behavior during floor curing.

Number of DHW charging attempts

Setting the number of DHW charging attempts before abortion or electric heater activation.

Delay 3-ph current error

Action taken when a 3-phase current error persists for a set period.

Delay flow switch source / consumers

Action taken when flow switch signals persist, potentially leading to lockout.

Release above OT

Releasing the heat pump based on composite outside temperature for bivalent operation.

Forced buffer storage tank charging

Behavior of the heat pump during forced buffer storage tank charging.

Full charging of buffer storage tank

Behavior of the heat pump during full buffer storage tank charging.

Defrost function for air-to-water HP

How defrosting is achieved using fan or process reversal for air-to-water heat pumps.

Automatic defrost function

Automatic defrost activation based on temperature differences and timing parameters.

Manual defrosting

Manual triggering of defrost via inputs or operating lines.

Defrost release below OT

Conditions for releasing defrost based on source inlet temperature relative to a setpoint.

Numb defrost attempts max

Setting the maximum number of defrost attempts before heat pump lockout.

Duration defrost lock

Time period after which the next defrost attempt can be initiated.

Time up to forced defrost

Prerequisite for defrosting based on source temperature and preheating period.

Defrost time max

Maximum duration for a defrost process, with retry logic.

Frost protection for the heat pump

Releasing the heat pump based on flow/return temperature falling below a threshold.

Cooling

Operating the heat pump in active cooling mode using a process reversing valve.

Active cooling

Heat pump operating as a refrigeration machine, requiring specific system diagrams.

Passive cooling with brine-to-water or water-to-water heat pump

Cooling using cold water circulation without a refrigeration source.

Switch-off temp max cooling

Preventing compressor operation if return temperature exceeds maximum cooling switch-off temperature.

Source temp min cool mode (frost protection)

Minimum source temperature setting to prevent ice formation in passive cooling.

SD ch’over cooling pas/act

Switching to passive cooling if source temperature drops below cooling setpoint.

Setp red cooling mode

Adjusting return temperature setpoint for active cooling based on cooling curve and set value.

6.13 Cascade

Settings for managing heat sources in a cascade system, including integral release and switch-on delay.

Control

Settings for managing heat sources in a cascade system, including integral release and switch-on delay.

6.14 Solar

Using solar energy for swimming pool heating and DHW/buffer charging, with priority selection.

Charging controller solar (dT)

Controlling solar charging based on temperature differentials and minimum collector temperatures.

Priority

Setting priority for solar charging of swimming pools over storage tanks.

Frost protection for the collector

Activating the collector pump to prevent freezing when frost risk is detected.

Overtemperature protection for the collector

Continuing storage tank charging to reduce excess heat and stopping when safety temperature is reached.

6.15 Buffer storage tank

Integrating buffer storage tanks for heating, cooling, and DHW charging.

Forced charging

Triggering forced charging to save electricity or fully charge the tank before heat pump lockout.

Automatic locks

Locking the heat source based on buffer storage tank temperatures and differentials.

6.16 DHW storage tank

Controlling DHW temperature, priority, and legionella function, with criteria for abortion.

Charging control

Making DHW requests to heat sources based on setpoint boost, transfer boost, and charging types.

Overtemperature protection

Charging DHW until maximum temperature is reached, with collector pump reactivation.

Electric immersion heater

Operating modes and release conditions for electric immersion heaters in DHW systems.

El immersion heater control

Control methods for electric immersion heaters using external thermostats or DHW sensors.

Plant hydraulics

Configuring buffer storage tanks and solar integration for DHW systems.

6.17 Instantaneous DHW heater

Supporting DHW heating via external heat exchangers with speed-controlled pumps and mixing valves.

Summary

Supporting DHW heating via external heat exchangers with speed-controlled pumps and mixing valves.

Setpoints

Defining minimum setpoint difference to tank temperature for instantaneous DHW heaters.

Speed-controlled pump

Setting minimum pump speed for instantaneous DHW heaters.

6.18 Configuration

Steps for configuring the system by selecting and adjusting plant diagrams and parameters.

Procedure

Steps for configuring the system by selecting and adjusting plant diagrams and parameters.

Preselection of plant diagram

Preselecting plant diagrams using a number and connecting sensors for correct identification.

Manual setting / adjustment of partial diagrams

Manually creating or adjusting plant diagrams using available partial diagrams and catalogs.

Heating / cooling circuit 1

Enabling heating and cooling circuits, and configuring mixing valve usage.

DHW controlling element Q3

Setting the DHW control element to charging pump or diverting valve.

8 Technical data

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