SystemAir SR105.H.SYS.G4+F7.EC LPF.S1.R1 Owner's manual

Roof-mounted air conditioning unit

Regulation Manual

9 720 â 35 000 m3/h

49.2 â 216.4kW

49.6 â 210.6kW

SR55 / SR65 / SR80 / SR95 / SR105 / SR120 / SR140

SR160 / SR190 / SR210

SysAer

CONTROL MANUAL

NOTICE DE REGULATION

REGELUNGSHANDBUCH

MANUALE DI REGOLAZIONE

INSTRUCCIONES DE REGULACIÓN

English

Français

Español

Deutsch

Italiano

English

2SysAer

CONTENTS

1. INTRODUCTION ................................................................................................................................................................................. 3

2. INPUTS/OUTPUTS DESCRIPTION ....................................................................................................................................................... 4

2.1. SYSAER SR55 - SR65 - SR80 - SR95 - SR105 - SR120 - SR140 ........................................................................................................................................... 4

2.1.1. DIGITAL INPUTS ..........................................................................................................................................................................................................................................................4

2.1.2. ANALOGUE INPUTS ....................................................................................................................................................................................................................................................4

2.1.3. DIGITAL OUTPUTS .......................................................................................................................................................................................................................................................4

2.1.4. ANALOGUE OUTPUTS ................................................................................................................................................................................................................................................5

2.2. SYSAER SR160 - SR190 - SR210 .................................................................................................................................................................................................5

2.2.1. DIGITAL INPUTS ..........................................................................................................................................................................................................................................................5

2.2.2. ANALOGUE INPUTS ....................................................................................................................................................................................................................................................5

2.2.3. DIGITAL OUTPUTS .......................................................................................................................................................................................................................................................6

2.2.4. ANALOGUE OUTPUTS ................................................................................................................................................................................................................................................6

2.3. ACTIVE RECOVERY OPTION ............................................................................................................................................................................................................ 6

2.3.1. DIGITAL INPUTS ..........................................................................................................................................................................................................................................................6

3. ROOM AIR TEMPERATURE CONTROL ................................................................................................................................................ 7

3.1. SUMMER/WINTER SWITCHING ..................................................................................................................................................................................................... 7

3.2. UNIT ON/OFF ...................................................................................................................................................................................................................................7

3.2.1. KEYING ON/OFF: ........................................................................................................................................................................................................................................................8

3.2.2. REMOTE ON/OFF ........................................................................................................................................................................................................................................................8

3.2.3. ON/OFF BASED ON TIMER CLOCK ...........................................................................................................................................................................................................................8

3.2.4. ON/OFF BY SUPERVISOR (OR BMS : BUILDING MANAGEMENT SYSTEM) ......................................................................................................................................8

3.2.5. ON/OFF BY PLAN NETWORK ....................................................................................................................................................................................................................................8

3.3. COMPRESSOR CONTROL ................................................................................................................................................................................................................9

3.3.1. COMPRESSOR ROTATION ..........................................................................................................................................................................................................................................9

3.3.2. COMPRESSOR CYCLING .......................................................................................................................................................................................................................................... 10

3.4. DEFROST MODE .............................................................................................................................................................................................................................10

3.5. MAIN FAN ......................................................................................................................................................................................................................................10

3.6. TEMPERATURE-BASED FREECOOLING AND FREEHEATING CONTROL ...................................................................................................................................10

3.6.1. SUMMER FREECOOLING ......................................................................................................................................................................................................................................... 11

3.6.2. WINTER FREEHEATING ............................................................................................................................................................................................................................................11

3.6.3. WINTER FREECOOLING ........................................................................................................................................................................................................................................... 11

3.6.4. NATURAL COOLING COMPRESSOR OPERATION ................................................................................................................................................................................................. 12

3.6.5. ENTHALPY-BASED FREECOOLING AND FREEHEATING CONTROL .................................................................................................................................................................... 13

3.7. THREE DAMPERS ECONOMIZER OPTION ...................................................................................................................................................................................14

3.8. SUPPLY AIR TEMPERATURE MINIMUM LIMIT ............................................................................................................................................................................14

3.9. FRECO OPTION ...............................................................................................................................................................................................................................14

3.10. THERMODYNAMIC RECOVERY OPTION - TRECO ....................................................................................................................................................................15

3.10.1. MAIN CONTROLLER .............................................................................................................................................................................................................................................. 15

3.10.2. SECONDARY CONTROLLER .................................................................................................................................................................................................................................. 16

3.10.3. OPERATING LIMITS ............................................................................................................................................................................................................................................... 16

3.11. AUXILIARY HEATING ...................................................................................................................................................................................................................17

3.11.1. AUXILIARY ELECTRICAL HEATING ELEMENTS ................................................................................................................................................................................................... 18

3.11.2. HOT WATER COIL ................................................................................................................................................................................................................................................... 18

3.11.3. MODULATING GAS BURNER ................................................................................................................................................................................................................................ 19

3.11.4. GAS BURNER TWO STAGE ................................................................................................................................................................................................................................... 20

3.12. SET POINT COMPENSATION ......................................................................................................................................................................................................21

4. ROOM AIR QUALITY CONTROL ........................................................................................................................................................ 22

5. SMOKE DETECTOR .......................................................................................................................................................................... 23

6. SCHEDULING ................................................................................................................................................................................... 23

6.1. WEEKLY SCHEDULING ...................................................................................................................................................................................................................23

6.2. DAILY SCHEDULING .......................................................................................................................................................................................................................24

6.3. ON/OFF ...........................................................................................................................................................................................................................................24

6.4. UNOCCUPIED MODE OUTSIDE THE BAND ..................................................................................................................................................................................24

7. USER INTERFACE............................................................................................................................................................................. 25

7.1. KEYPAD ...........................................................................................................................................................................................................................................25

7.2. LEDS ................................................................................................................................................................................................................................................25

7.3. MENUS ............................................................................................................................................................................................................................................25

7.4. USER INTERFACE CONNECTION ...................................................................................................................................................................................................26

7.5. MULTI ROOFTOPS INSTALLATION ...............................................................................................................................................................................................27

7.5.1. PRINCIPLE ................................................................................................................................................................................................................................................................. 27

7.5.2. CONNECTIONS .........................................................................................................................................................................................................................................................28

7.6. ADDRESSES CONFIGURATION ......................................................................................................................................................................................................29

7.7. ACCESS TO THE UNITS OF THE PLAN NETWORK VIA THE SINGLE TERMINAL ......................................................................................................................31

7.8. TRECO FUNCTION CONTROLLER .................................................................................................................................................................................................32

7.8.1. USER INTERFACE...................................................................................................................................................................................................................................................... 32

7.8.2. KEYPAD ..................................................................................................................................................................................................................................................................... 32

7.8.3. HOME PAGE.............................................................................................................................................................................................................................................................. 32

7.8.4. MENUS ...................................................................................................................................................................................................................................................................... 33

7.9. SERVICE MENU ..............................................................................................................................................................................................................................35

7.9.1. OPERATION TIME .....................................................................................................................................................................................................................................................35

7.9.2. SAVE / LOAD ............................................................................................................................................................................................................................................................ 35

8. ALARM MANAGEMENT .................................................................................................................................................................. 36

8.1. MAIN CONTROLLER ALARMS (CAREL) ......................................................................................................................................................................................36

8.2. ALARM LOG ...................................................................................................................................................................................................................................38

8.3. ALARM-WARNING SMS ...............................................................................................................................................................................................................38

8.4. TRECO MODULE ALARMS.............................................................................................................................................................................................................39

9. SERVICING (CAREL) ........................................................................................................................................................................ 41

9.1. COMPRESSOR AND UNIT HOUR-METER CONTROL ..................................................................................................................................................................41

9.2. INPUTS/OUTPUTS TEST .................................................................................................................................................................................................................41

10. MENU DESCRIPTION (CAREL) ....................................................................................................................................................... 42

English

3SysAer

1. INTRODUCTION

The IATC (Intelligent Air Technology Control) can manage rooftop air-conditioning unit with:

²Two circuits comprising one or two compressors

²Main blower

²One return fan

²Economizer: 2 or 3 dampers

²Electrial heaters (2 stages)

²Heating valve (hot water coil)

²2-stage or modulating gas burner

²Heat recovery FRECO

²Recovery of thermodynamic heat TRECO

The IATC can regulate from temperature, humidity or air quality setpoints.

Passive energy economizers:

²Summer freecooling

²Winter freecooling

²Winter freeheating

²RECO: recovery of energy from air extracted from the building on external nned coils

²FRECO: recovery of energy from the condensers of supermarket food refrigeration systems

Active energy economizers:

²TRECO: recover of thermodynamic energy between the air extracted from the building and fresh air

The IATC manages the rooftop unit’s main alarms: antifreeze, generic interlocks, clogged lters and all

refrigerant circuit alarms, such as: compressor thermal overload, high and low pressure switch.

POWER SUPPLY MUST BE

SWITCHED OFF BEFORE STARTING

TO WORK IN THE ELECTRIC

CONTROL BOX

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2. INPUTS/OUTPUTS DESCRIPTION

(*) Customer input

N° Description

ID1 Thermal circuit breaker of the return fan

ID2 Filter clogging contact

ID3 Remote Summer/Winter (*)

ID4 Main blower thermal cut-out

ID5 Remote start/stop (*)

ID6 Alarm feedback of the active recovery (TRECO)

ID7 Smoke detector

ID8 Circuit 1 thermal circuit breaker of the compressor and fan

ID9 Hot water coil anti-freeze security

ID10 Circuit 2 thermal circuit breaker of the compressor and fan

ID11 Thermal circuit breaker of the electric battery 1 and 2

ID12 FRECO anti-freeze security

ID13 High-pressure switch circuit 1

ID14 High-pressure switch circuit 2

N° Description Code

B1 Circuit 1 evaporation pressure transducer EP1

B2 Circuit 2 evaporation pressure transducer EP2

B3 Defrost temperature circuit 1 OCT1

B5 Defrost temperature circuit 2 OCT2

B6 Return air temperature RAT

B7 Outdoor air temperature OAT

B8 Supply air temperature SAT

N° Description

NO1 Compressor circuit 1 contactor

NO2 Condenser fan circuit 1

NO3 Main blower + Exhaust blower

NO4 Compressor circuit 2 contactor

NO5 Condenser fan circuit 2

NO6 Thermodynamic recovery mode (TRECO)

NO7 Thermodynamic recovery control (TRECO)

NO8 General alarm

NO9 Electrical Heater 1 / Gas burner stage 1

NO10 Electrical Heater 2 / Gas burner stage 2

NO11 Drop in main and return fan speed

NO12 Cycle reversing solenoid valve circuit 1 + All seasons

NO13 Cycle reversing solenoid valve circuit 2 + All seasons

2.1. SYSAER SR55 - SR65 - SR80 - SR95 - SR105 - SR120 - SR140

2.1.1. DIGITAL INPUTS

2.1.2. ANALOGUE INPUTS

2.1.2.1. EXPANSION BOARD

N° Description Code

B1 Return air relative humidity or indoor air quality RAH oR RAQ

B2 Not used

B3 Circuit 1 condensation pressure transducer CP1

B4 Circuit 2 condensation pressure transducer OR relative humidity of the outside air CP2 / OAH

2.1.3. DIGITAL OUTPUTS

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5SysAer

N° Description

Y1 Economizer damper

Y2 Heating valve

Y3 FRECO control

Y4 Not used

2.1.4. ANALOGUE OUTPUTS

2.2. SYSAER SR160 - SR190 - SR210

2.2.1. DIGITAL INPUTS

(*) Customer input

2.2.1.1. EXPANSION BOARD

N° Description

ID1 Return blower thermal cut-out

ID2 Clogged filter alarm

ID3 Remote Summer/Winter (*)

ID4 Main blower thermal cut-out

ID5 Remote start/stop (*)

ID6 Circuit 1 electronic pressure reducing valve

ID7 Smoke Detector

ID8 Circuit 1 thermal circuit breaker of the compressor and fan

ID9 Hot water coil anti-freeze security

ID10 Circuit 2 thermal circuit breaker of the compressor and fan

ID11 Electrical Heater 1 and 2 thermal cut-out / Gas burner stage 1

ID12 Circuit 2 electronic pressure reducing valve

ID13 High-pressure switch circuit 1

ID14 High-pressure switch circuit 2

N° Description

ID1 Alarm feedback of the active recovery (TRECO)

ID2 Not used

ID3 FRECO anti-freeze security

ID4 Not used

2.2.2. ANALOGUE INPUTS

2.2.2.1. EXPANSION BOARD

N° Description Code

B1 Low pressure transducer circuit 1 EP1

B2 Low pressure transducer circuit 2 EP2

B3 Defrost temperature circuit 1 OCT1

B4 Suction temperature circuit 1 CST1

B5 Defrost temperature circuit 2 OCT2

B6 Return air temperature RAT

B7 Supply air temperature SAT

B8 Suction temperature circuit 2 CST2

N° Description Code

B1 Return air relative humidity or quality RAH or RAQ

B2 Outdoor air temperature (NTC / 4-20mA) OAT

B3 Circuit 1 condensation pressure transducer CP1

B4 Circuit 2 condensation pressure transducer OR relative humidity of the outside air CP2 / OAH

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2.2.3. DIGITAL OUTPUTS

2.2.3.1. EXPANSION BOARD

2.2.4. ANALOGUE OUTPUTS

2.2.4.1. EXPANSION BOARD

N° Description

NO1 Compressor 1 circuit 1 contactor

NO2 Condenser fan circuit 1

NO3 Compressor 2 circuit 1 contactor

NO4 Compressor 1 circuit 2 contactor

NO5 Condenser fan circuit 2

NO6 Compressor 2 circuit 2 contactor

NO7 Main blower + Exhaust blower

NO8 General alarm

NO9 Electrical Heater 1

NO10 Electrical Heater 2

NO11 Drop in main and return fan speed

NO12 Cycle reversing solenoid valve circuit 1 + all seasons

NO13 Cycle reversing solenoid valve circuit 2 + all seasons

N° Description

Y1 Electronic expansion valve circuit 1

Y2 Electronic expansion valve circuit 2

Y3 Economizer damper

Y4 Heating valve

N° Description

NO1 Thermodynamic recovery ON/OFF (TRECO)

NO2 Thermodynamic recovery mode (TRECO)

NO3 Not used

NO4 Not used

N° Description

Y1 FRECO valve

2.3.1. DIGITAL INPUTS

N° Description

D1 On/off control

B2 Mix air temperature

B3 Ambient air temperature

X1 Evaporation pressure transducer

X2 Condensation pressure transducer

X8 Compressor thermal circuit breaker

Q11 Active recovery module alarm

Q34 Compressor contactor

Q54 Switchover valve contactor

DL1 High pressure pressure switch

DL2 Heat/cold mode control

2.3. ACTIVE RECOVERY OPTION

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3. ROOM AIR TEMPERATURE CONTROL

Room temperature is regulated with following devices:

²Compressors,

²Additional heating

hot water coil

electric coil

gas burne

²Economizer: 2 or 3 dampers

²Energy recovery system

2 set points can be managed, one for summer mode and one for winter mode.

3.1. SUMMER/WINTER SWITCHING

3.2. UNIT ON/OFF

To transition from summer mode to winter mode (and vice versa), proceed as follows:

1. From the display with Summer/Winter facility (optional)

Press "PRG" key to enter to the main menu - select Summer/Winter and press ENTER. Pressing the

ENTER key, you switch between summer and winter. The unit must be OFF beforehand..

2. From remote switching via digital input ID3 and terminal 24V

²Contact open: summer mode

²Contact closed: winter mode

3. From automatic changeover, based on room air temperature

The unit switches from summer to winter mode or vice versa depending on the room air

temperature.

²RAT > summer setpoint and RAT > winter setpoint + Auto change differential => summer mode

²RAT < winter setpoint and RAT < summer setpoint – Auto change differential => winter mode

A differential is used to avoid constant summer  winter switching. Moreover, automatic

changeover can change the mode only one time each 30 minutes.

4. From PC Supervisor (if selected)

5. From PLAN network if the unit is congured as slave

The unit can be switched ON/OFF, by priority order, as follows:

1. From the display with ON/OFF unit facility

2. From remote ON/OFF digital input (ID5) (if active)

3. From daily and/or weekly scheduling (if active, see the related part)

4. From PC Supervisor program (if connected and active)

5. From PLAN (if Plan active, see the related part)

IMPORTANT: All the ON/OFF active conditions must be switched ON to turn the unit ON. If one of these

conditions is OFF, the unit is turned OFF.

NB.: It is possible to congure via the Service menu if the unit must start after a random time (60s max), to

avoid start-up current peaks. After a power failure or a switch ON, the unit will wait a random time before

starting the main blower.

English

8SysAer

3.2.2. REMOTE ON/OFF

3.2.3. ON/OFF BASED ON TIMER CLOCK

3.2.4. ON/OFF BY SUPERVISOR (OR BMS : BUILDING MANAGEMENT SYSTEM)

3.2.5. ON/OFF BY PLAN NETWORK

The unit is ON if the following conditions are encountered:

²If the digital input ID5 is active via the Service menu

²If the dry contact is closed

The unit is OFF if the contact is open.

The unit is ON if all the following conditions are encountered:

If the unit has a clock card tted

²If the clock card is active via the Service menu

²If the daily scheduling is active via the Clock menu

²If the daily scheduling is congured in ON/OFF (not in Unoccupied)

²If the hour is inside the programmed time band

²If the weekly scheduling is active and the current day is programmed ON

The unit is OFF if the hour is outside the band or the current day is programmed OFF.

The unit is ON if all the following conditions are encountered:

²If the unit is connected to a supervisor

²If ON/OFF by supervisor is active via the Service menu

²If the communication parameters are congured via the Service menu

²If the supervisor sends ON

The unit is OFF is the supervisor sends OFF.

The unit is ON if all the following conditions are encountered:

²If the unit is connected to a Master unit in Plan

²If the unit is congured as Slave

²If the Master unit is ON

The (Slave) unit is OFF if the Master unit is OFF.

3.2.1. KEYING ON/OFF:

Select UNIT ON/OFF from the main menu and press ENTER: pressing the ENTER key on the display, you

switch the unit ON and OFF. If the unit is switched OFF via the display, none of the other ON/OFF procedures

can be used to switch it back ON. If the unit is OFF, all unit functions and its various controls are disabled,

except smoke detection.

English

0%50%100% 0% 50% 100%

C2 C1 C2

Dead zone / 2

Room Temp.

Summer

Setpoint

Winter

Setpoint

Differential Differential

0%25%50%75%100% 0% 25% 50% 75% 100%

C4 C3 C2 C1 C1 C2 C3 C4

Dead zone / 2

Room Temp.

Summer

Setpoint

Winter

Setpoint

Differential Differential

9SysAer

Operation with 2 Compressors (1/2 circuit) with proportional (P) regulation

Operation with 4 Compressors (2 circuits) with proportional (P) regulation

The compressors rotation is managed according to the circuits (in the case of a 2-circuits conguration) and

the compressors status.

The circuits and the compressors of each circuit rotation follows FIFO (First In First Out) logic, i.e. the rst

circuit to switch ON will be the rst to switch OFF and the rst compressor of one circuit to switch ON will

be the rst to switch OFF.

When a compressor is requested to start, the following conditions are observed:

The rst circuit to stop will be the rst to start.

In the selected circuit, the compressor that has been OFF for a longer time will be the rst one to switch ON.

The rst compressor to switch ON is the rst one to switch OFF.

A compressor will switch ON again, not before all the other compressors have started.

In standard operation, Summer Setpoint = 24°C, Summer Differential = 2°C, Winter Setpoint = 21°C, Winter

Differential = 2°C.

3.3. COMPRESSOR CONTROL

3.3.1. COMPRESSOR ROTATION

The number of compressors and circuits depends on unit conguration.

Compressors ON/ OFF is controlled by the room air temperature (RAT).

The compressors will not work as long as they are locked in the Service menu (P1 and P2).

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3.3.2. COMPRESSOR CYCLING

3.4. DEFROST MODE

The 2 circuits can not defrost at the same time.

If both circuits are requested to defrost at the same time, one circuit will be kept waiting.

NB.: During defrost, the main fan stays on.

When one circuit is defrosting, the second is forced to full heat capacity (one or two compressors ON,

depending on the unit conguration) and maintained 3 minutes after the end of defrost, to attenuate the

effect of defrost on supply air temperature. Moreover, the second circuit is not allowed to defrost during the

5 minutes after the defrost of the rst circuit.

3.5. MAIN FAN

The main fan is the rst device that starts up within 10 seconds when the unit is switched on. When the unit

is switched off, the main fan continues to operate for about 50 seconds according to the options:

a post-ventilation period of 30 seconds occurs for electric or gas auxiliary heating.

In normal operation (unit ON), the main fan is always ON. But it can be switched OFF depending of the

conguration of the scheduling (see the related part).

For the purpose of saving energy, the fan speed can be reduced when the temperature setpoint is reached

in the room (option to enable via the P9 screen of the service menu)

The main fan, as all the other electric components of the unit, can be started by the digital output test procedure

(Maintenance menu) if there are no alarms to inhibit it.

3.6. TEMPERATURE-BASED FREECOOLING AND FREEHEATING CONTROL

With the unit working in FREECOOLING or FREEHEATING mode, external air can be exploited when its

temperature conditions are favourable with respect to the temperature of the room air. This control is not

available without the ECONOMIZER (2 or 3 dampers) Temperature control option.

The compressor cycling is driven by different delays:

²Compressor start-up delay after main blower has been started: the compressor will switch ON only

when the blower is ON for about 10 seconds.

²Minimum compressor OFF-time: it makes sure that the compressor stays OFF for a while before it is

switched ON again.

²Minimum compressor ON-time: this time makes sure that the compressor, once switched ON, stays

ON for a while before it is switched OFF again (should any alarm be activated, the compressor will

switch OFF immediately regardless of the above-mentioned delays ).

²Time lag between starts of a compressor: this time ensures that, once a compressor has been

started, the said time is taken before this compressor starts again (limits demands per hour).

²Time lag between the starts of different compressors: this time ensures that the said time is taken

before other compressors can switch ON (limits current peaks).

The circuit must be de-frosted if one of the following conditions is fullled:

²Air temperature (RAT) – the de-frosting temperature (OCT) is greater than or equal to a difference

(12°C by default) for a dened period (30 s by default)

²The evaporation pressure is less than 1.8 bar for 5 s.

Preventive de-frosting can be used according to the outdoor temperature or if a circuit can be stopped due

to icing.

During de-frosting, the aps of the saver close to use the building's heat to de-frost the batteries.

The de-frosting phase ends if the de-frosting temperature (OCT) is greater than the value set (18°C by

default).

For de-frosting that is too frequent (>3/h) or too long (10 min), an alarm is displayed.

English

100%

Economizer

Room Temp.

Winter

Setpoint

FreeH_Diff.

FreeH_Offset

compressor

operation

100%

Economizer

Room Temp.

Summer

Setpoint

FreeC_Diff.

FreeC_Offset

compressor

operation

0% 100%

Economizer

Room Temp.

Winter Setpoint -

Dead Zone/2

Dead Zone

Winter_diff. -

compressor

operation

The blast temperature minimum limit neutralizes the damper modulation, forcing it to close.

Caution

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3.6.1. SUMMER FREECOOLING

3.6.2. WINTER FREEHEATING

3.6.3. WINTER FREECOOLING

The summer freecooling is allowed only

if: Outdoor Temp < Room temperature –

Freecooling/heating differential, to ensure

that outdoor air is cold enough to cool room

air.

The opening of the external damper is

controlled by the room air temperature as

illustrated in the following gure.

In standard operation, Summer STP = 24°C, FreeC_Offset = -2°C, FreeC_Diff = 2°C

If the offset is set null or positive, freecooling can be made to start after the set point.

The winter freeheating is allowed only

if: Outdoor Temp > Room temperature

+ Freecooling/heating differential, to

ensure that outdoor air is hot enough to

heat room air.

The opening of the external damper is

controlled by the room air temperature

as illustrated in the following gure.

In standard operation, Winter STP = 21°C, FreeC_Offset = 2°C, FreeC_Diff = 2°C

If the offset is set null or negative, freeheating can be made to start before the set point.

Winter freecooling is useful in shopping

centres during operation in winter,

where overcrowding inevitably causes

temperature to exceed the set point,

meaning the place needs cooling as

opposed to heating. Therefore, for the

job of cooling, external conditions are

exploited, which are almost always

favourable for this purpose in winter.

The summer freecooling is allowed only if: Outdoor Temp < Room temperature – Freecooling/heating

differential, to ensure that outdoor air is cold enough to cool room air.

The opening of the external damper is controlled by the room air temperature as illustrated in the following

gure.

The set point and differential (also considered the dead zone/2) are the ones relating to winter mode.

In SUMMER FREECOOLING and WINTER FREEHEATING situations, the normally closed (at minimum position)

external damper starts to mix external air with room air in an attempt to move the work point as near as

possible to the set point, hence turning off as many devices as possible switched ON for cooling or possibly

heating purposes.

The ideal condition would be when the desired temperature or enthalpy is reached just by modulating the

damper.

There is an option in the Service menu to select the minimum damper opening when the unit is ON.

English

OAT

1/21/4 3/4

+1°C

Economizer

Winter

Setpoint

FreeH_Diff.

FreeH_Offset

OAT

1/2

+1°C

12 SysAer

SyAer 55 - 65 - 80 - 95 - 105 - 120 - 140

SyAer 160 - 190 - 210

3.6.4. NATURAL COOLING COMPRESSOR OPERATION

In some cases, the natural cooling conditions are lled but the thermal load of the building does not cool

down the building enough. In these conditions, the thermodynamic circuits are used as assistance for natural

cooling.

In order to protect the thermodynamic circuit, a limited number of compressors can operate:

English

En [KJ]

STPEN ENIENE

En [KJ]

STPEN

ENI ENE

En [KJ]

STPEN

ENI ENE

En [KJ]

STPEN ENIENE

En [KJ]

STPEN

ENIENE

En [KJ]

STPEN

ENI ENE

0% 100%

Economizer Room

Enthalpy

(kJ/kg)

Enthalpy_STP

Enthalpy_Diff

13SysAer

3.6.5. ENTHALPY-BASED FREECOOLING AND FREEHEATING CONTROL

Opening the outdoor-air damper will not be a suitable response in either of the conditions illustrated above (1, 2)

since indoor enthalpy is nearer to the enthalpy set point than the outdoor enthalpy.

The enthalpy-based freecooling and freeheating control feature manages external damper opening based

on internal and external enthalpy conditions.

With room temperature and air humidity, the controller calculates the room enthalpy (see the Inputs/Outputs

menu), with external (outdoor) temperature and humidity, the controller calculates the outdoor enthalpy;

and with the temperature and Humidity control set points, it calculates the enthalpy set point. The aim of

the control feature is to keep room enthalpy as near as possible to the Enthalpy set point to save energy.

The following conditions may occur:

Opening the damper will be a suitable response in either of the conditions illustrated above (3, 4) since

external enthalpy is nearer to the enthalpy set point than internal enthalpy.

STPENS Enthalpy set point [KJ]

ENI Indoor enthalpy [KJ]

ENE External enthalpy [KJ]

In case number 5 illustrated above, indoor

enthalpy is nearer to the enthalpy set point than

external enthalpy. However, in this case, opening

the damper is a suitable response because, with

the mixing of the two enthalpies (indoor and

external), indoor enthalpy will however approach

the enthalpy set point.

In case number 6 illustrated above, external

enthalpy is nearer to the enthalpy set point than

indoor enthalpy. Consequently, opening the

damper is a suitable response because, with the

mixing of room air and external air, indoor enthalpy

will however approach the enthalpy set point.

In standard operation:

Enthalpy setpoint = 38 kJ/kg (from

temperature and humidity setpoints),

Enthalpy diff = 5kJ/kg.

Should any of the cases illustrated above (3, 4, 5, 6) occur, damper opening will depend on internal enthalpy

as shown in the gure below:

English

Economizer

Supply

Temp.

Supply Setpoint

Supply Diff.

Normal Damper

opening

Normal opening / 2

Min Opening

100%

FRHR control

Heating

Setpoint

FRHR_differential

FRHR_min

Room_air

temp

Secondary heater

and

thermodynamical

heating

14 SysAer

3.9. FRECO OPTION

This option can recover the heat released by the cooling systems used in sales spaces. A valve can control

the water ow in the corresponding coil.

This option can be activated on the user interface and can only be activated in heat mode.

The valve is controlled according to the temperature delta between the air temperature measured in

the room and the temperature setpoint. If the valve is fully open with an additional load request, the

thermodynamics circuits and/or the auxiliary heating take over.

3.7. THREE DAMPERS ECONOMIZER OPTION

For example, if the winter freecooling function opens the damper at 60% (normal opening), and the supply

air function closes the damper of 50%, the nal opening will be 50% of 60%, that is to say 30%.

When supply air temperature starts to increase to the point of exceeding supply set point + differential, then both

the external damper and heating valve revert to normal operating mode (the minimum limit on supply air during

winter mode does not interact with compressor operation).

Winter mode

When supply air temperature drops below the supply set point + differential, the winter freecooling is

disabled, the heating valve is forced to fully open and the external air damper is gradually forced to close,

as illustrated bellow:

Summer mode

If the blast temperature drops below the blast set point, the outdoor air damper is gradually closed (as in

winter mode) and an operating compressor is switched off for a period of 10 minutes.

3.8. SUPPLY AIR TEMPERATURE MINIMUM LIMIT

The return blower is a part of the 3-Damper economizer option.

This fan is controlled in the same way as the main blast fan.

If the return blower cuts out, the unit is immediately stopped.

In de-frosting mode, the valve is opened at a denable value in the settings menu.

If the de-frosting contact of the FRECO battery is activated, the valve is fully open.

The Supply air temperature minimum limit protects the room against sudden drops in temperature and cold

air draughts.

English

SYSAER

CAREL

main

controller

TRECO

SIEMENS

secondary

controller

TRECO activation order

Summer/winter mode

TRECO alarm

Information

The TRECO start-up forces the dampers to open up to the minimum required % (40%), if the % set

by the user is less than this value.

15SysAer

The active recovery is managed by a third party controller but the operating order and operating mode are

managed by the main controller.

The thermodynamic protective systems are managed directly by the dedicated controller. If an error arises,

the alarm output sends the information to the main controller. The specic name of the alarm can be

accessed from the screen of the active recovery controller.

In cool mode, thermodynamic recovery is activated if all the following conditions are met:

²The indoor temperature is below 25°C with a hysteresis of 1°C (default values)

²A minimum compressor is operating

²No freecooling

²No de-frosting

²The aps are open at least for TRECO new air for more than 100 seconds

In heat mode, thermodynamic recovery is activated if all the following conditions are met:

²The indoor temperature is above 15°C with a hysteresis of 1°C (default values)

²A minimum compressor is operating

²No freeheating

²No de-frosting

²The aps are open at least for TRECO new air for more than 100 seconds

3 items of information are exchanged by dry contacts between the main controller (CAREL) and the TRECO

controller (Siemens)

The summer/winter mode is equivalent to the operating mode of the main controller

The activation order is controlled according to the conditions specied below

The TRECO controller operation can be overridden using the Au2 menu of the CAREL controller. The prior

condition is the manual opening of the dampers and switching on of the main fan.

3.10. THERMODYNAMIC RECOVERY OPTION - TRECO

3.10.1. MAIN CONTROLLER

English

16 bar

40 bar

42 bar

14 bar4 bar

Cooling mode

Working zone

Evaporating

Pressure

MOP

envelope

LOP

envelope cool

HPMin

envelope

HPMax

envelope

HP Switch

Condensing

Pressure

16 bar

40 bar

42 bar

14 bar1.75 bar

1.5 bar

Heating mode

Working zone

Evaporating

Pressure

MOP

envelope

LOP

envelope heating

HPMin

envelope

HPMax

envelope

HP Switch

Condensing

Pressure

LOP

security

16 SysAer

3.10.2. SECONDARY CONTROLLER

The TRECO is authorized to start up if the mix air temperature (MAT) is:

²greater than 5°C in winter

²less than 40°C in winter

If these conditions are not activated

²TRECO does not start up.

²An "out of range" message is displayed on the home page.

²No error message is sent to the main regulator.

3.10.3. OPERATING LIMITS

The active recovery controller manages the operating limits of the unit. Alarms causing the unit to shut

down are generated if the operating limits are exceeded. The alarm contact is sent to the main controller.

English

Room Temp.

Winter

Setpoint

Comp_DiffAH_Diff

AH_Offset

compressor

operation

auxiliary

heating

Room Temp.

Winter

Setpoint

Comp_Diff AH_Diff

AH_Offset

compressor

operation

auxiliary

heating

17SysAer

Above OAT limit

Below OAT limit

3.11. AUXILIARY HEATING

When an auxiliary heating device is present (electrical heaters, hot water coil or gas burner), the management

in heating mode related to the compressors can be congured:

Via the SERVICE menu, an outdoor air temperature can be set to congure the auxiliary heating element as

an extra heater (standard) or to replace the thermodynamic heating.

Below this limit, the auxiliary heating element replaces the thermodynamic heating which is also enabled to

run if the auxiliary heating capacity is not sufcient. By default, this limit is set to -30°C.

If set to a high value (30°C for example), the auxiliary heating will always start before the compressors.

If set to a low value (-30°C for example), the compressors will start rst (standard).

If the auxiliary heating element is in alarm or if the unit is cooling only, the compressors automatically run

classically.

English

EH1 EH2

Room Temp.

Winter

Setpoint

Comp_DiffEH_Diff

EH_Offset

compressor

operation

100%

Room Temp.

Winter

Setpoint

Comp_DiffHV_Diff

HV_Offset

compressor

operation

HV_Opening

18 SysAer

In winter mode, a 0-10V valve controls the hot water ow through the hot water coil, according to the gure

below:

3.11.2. HOT WATER COIL

3.11.1. AUXILIARY ELECTRICAL HEATING ELEMENTS

This function is only available with the Electrical Heaters (2 stages) option.

Auxiliary electrical heating elements are controlled by room air temperature as illustrated in the gure below

provided the following conditions are met:

²The unit is in winter mode

²Electrical Heaters 1 and 2 are enabled (via the Service menu)

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SystemAir SR105.H.SYS.G4+F7.EC LPF.S1.R1 Owner's manual

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