Zehnder Rittling ComfoBox Q User manual

Zehnder ComfoBox Q / ComfoHeat
User's Manual
Release 04.2021
Heating Cooling Fresh air Clean air

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Zehnder ComfoBox Q / ComfoHeat User Manual, BA-CBQ_DE-CH V1.0
Introduction
Please read this document carefully before planning your installation.
This document has been prepared with the greatest care. However, no rights can be derived
from this. In addition, Zehnder Group International AG reserves the right to change the contents
of this document at any time without notice.
This document contains the information necessary to operate the Zehnder ComfoBox Series Q
compact energy centre and the ComfoHeat heat pump building system. The document does not
contain comprehensive information on the design, operation and implementation of the comfort
ventilation system, heating system, water heating system and geothermal heat source (earth
probe, soil collector or other water-based heat source).
© The contents of this document are the intellectual property of Zehnder Group International AG.
The acquisition of this document does not confer any rights on third parties to use patents or
other industrial property rights.
Comfosystems®, ComfoBox®, ComfoHeat®, ComfoAir®and ComfoTherm®are internationally
protected trademarks of the Zehnder Group.
Document No: TM-CBQ_DE-CH V1.0 Release 04.2021 (Author: MGR07)

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Contents
Introduction
1 Application
1.1 Description of the control panel
1.2 Main menu
1.3 Operating modes
1.4 Program
1.5 Statuses
1.6 Parameters
1.7 Switching on/off
1.8 Calendar
1.9 Heating
1.10 Cooling
1.11 Water heating / protection against legionella
1.12 Swimming pool
1.13 Information
1.14 Alarms
1.15 Faults
1.16 Comfort issues
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1 Application
1.1 Description of the control panel
Depending on the model of the heat pump and the configuration performed by the
technical customer service, the menu windows and their contents mentioned here
are not available.
The control panel of the heat pump consists of a display with 6 buttons and is mounted on the heat pump.
This is shown in the figure below.
No Description
Display1
The general functions of the individual buttons and their operation are described below.
 ACCESS KEYS [↑]/[↓]
This allows you to move the cursor with the menu lists in the menu windows within the lists.
In the menu, previous or next window of the menu can be opened. In menu windows with
configurable parameters, this function can be used to increase or decrease the value of a parameter
selected with the cursor.
 SELECT AND CONFIRM BUTTON [←]
This allows to call up the selected menu with the cursor in the menu windows and menu lists.
to home position. In menu windows with configurable parameters, this function allows to move the
cursor to the next configurable parameter in the menu window. If the cursor is set to the next
parameter to be set in the menu window, previously changed parameter is saved. In the main menu
window, this button can also be used to open the menu 1.7 INFORMATION directly.
 USER MENU SELECTION BUTTON [PRG]
With this key, menu 1 USER can be directly accessed at any point in the program.
 [PRG]+[ESC] BUTTONS SIMULTANEOUSLY
Pressing [Prg]+[Esc] buttons simultaneously opens menu 2 INSTALLER.
This program level is password protected.
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Access keys [↑]/[↓]2
Select and confirm button [←]3
No Description
Alarm menu selection button [alarm]4
User menu selection button [Prg]5
Back button [Esc]6

 ALARM MENU SELECTION BUTTON [Alarm]
With this button, menu 1.9 ALARMS can be opened directly at any point in the program.
 BACK BUTTON [Esc]
This button allows to return to the previous menu at any point in the program.
1.2 Main menu
The window of the application's main menu consists of several fields containing information about the
operation of the heat pump.
Brine pump activated
Compressor in start-up phase
Compressor activated
Compressor in shutdown phase
Output pump activated
Heating groups activated
Cooling groups activated
HRT system activated
Electricity meter
Operating mode
Status
Active components
Work programme
Date and time
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06/11/2016 Mon 14:25 1.7 5.1

1.3 Operating modes
This field displays symbols indicating the corresponding active operating modes. Depending on the heat
pump model and configuration performed by technical customer service, several operating modes may
be displayed at the same time.
Operating mode DIRECT HEATING / operating mode DIRECT COOLING
The heat pump delivers hot/cold water directly to the heating/cooling system and adjusts the
output according to the consumption of the dwelling. The supply temperature and supply rate
are adjusted continuously to optimize system performance. These modes of operation are
activated when the heat pump receives a demand signal from equipment installed in rooms
(thermostats, th-Tune terminals, thT terminals or TH sensors).
Operating mode BUFFER HEATING / operating mode BUFFER COOLING
The heat pump supplies hot/cold water to the buffer tank of the heating/cooling system.
Output power, supply rate and supply temperature are controlled continuously to maintain
tank temperature and optimize system performance.
These modes of operation are activated when the buffer tank temperature is lower/higher
than the temperature difference required for activation.
Operating mode HOT WATER
The heat pump supplies hot water to increase the temperature of the storage tank to reach the
hot water supply temperature as soon as possible.
This mode of operation is activated when the temperature of the hot water tank is lower than
the temperature difference required for activation.
Operating mode SWIMMING POOL
The heat pump supplies hot water to the heat exchanger for the swimming pool and regulates
output power. The supply rate and supply temperature are adjusted continuously to optimize
system performance.
This operating mode is activated when the heat pump receives a message about the need to
produce heat in the swimming pool.
Operating mode LEGIONELLA PROTECTION
The heat pump raises the tank temperature to the temperature set by the technical customer
service for the Legionella Protection program. First, the temperature is raised with the help of
a compressor; then the additional hot water preparation system (if any) is activated until the
final temperature is reached.
This operating mode is activated according to the weekly Legionella Protection program.
Activation of different OPERATING MODES may depend on the time programming
functions or heat pump operation priorities (HOT WATER, HEATING, COOLING,
SWIMMING POOL).
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In addition to the symbols that define the corresponding operating modes, the following symbols can be
displayed in this field:
Operation
This shows the transfer of heat between the circuits.
When the symbol is displayed continuously, the heat pump is operating normally.
When the symbol flashes, the protection function of the heat pump is activated.
Power source
Withdrawal of energy from the energy source or injection of energy into the energy source.
Circuit inversion
HEATING/COOLING CIRCUIT is equipped with an inverter. Only for heat pumps with
inverter.
Maintenance
The compressor start is deactivated when there is a gap (15 minutes) between starts.
The number of minutes remaining until the compressor start is displayed next to the symbol.
This is not applicable. The heat pump will remain in standby mode as there is currently no
demand for it.
STANDBY
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WINTER program
The heat pump does not allow the activation of operating modes PASSIVE COOLING and
ACTIVE COOLING.
SUMMER program
The heat pump does not allow activation of the operating mode HEATING.
MIXED MODE program
The heat pump allows you to activate any mode of operation.
AUTOMATIC program
Depending on the outside temperature, the heat pump automatically selects between WINTER
and SUMMER programs. The required temperatures and times can be set by the user.
REMOTE CONTROL
WINTER/SUMMER program is selected using an external signal.
1.4 Program
The function program of the heat pump determines which operating modes can be activated.
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1.5 Statuses
The status indicates the availability of the heat pump to perform various functions.
Status ON
The heat pump is switched on and all its functions can be activated.
Status ON + EVU
The heat pump is on, but compressor start is deactivated by the EVU signal.
Secondary functions can be activated, such as starting the pumping equipment,
hot water circulation, etc.
Status ON + NIGHT TIME
The heat pump is switched on and all its functions can be activated. However,
there is a functional limitation due to night-time programming.
Status OFF via the control panel
The heat pump was manually switched off on the front panel of the control unit.
Activation of these functions is therefore not possible.
Status OFF in case of time or calendar programming
The heat pump switches off according to the programmed active time or calendar.
Activation of these functions is therefore not possible.
Status OFF by signal from data bus
The heat pump was switched off via an external signal via the data bus.
Activation of these functions is therefore not possible.
Status OFF by supervisor
In installations where several units are operating in parallel, the supervisor switched
off the heat pump. Activation of these functions is therefore not possible.
Status EMERGENCY STOP via control panel
The heat pump is in EMERGENCY STOP condition, which was activated manually
on the front panel of the control unit. The compressor cannot be started. However,
services may be provided if additional equipment is available for emergency use.
Status EMERGENCY STOP due to an active alarm
The heat pump is in status EMERGENCY STOP because there is an active alarm.
The compressor cannot be started. However, services may be provided if additional
equipment is available for emergency use.
Status EMERGENCY STOP due to repeated alarms
The heat pump is in the status EMERGENCY STOP, because it is a constantly
recurring alarm. The compressor cannot be started. However, services may be
provided if additional equipment is available for emergency use.
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1.6 Parameters
To change a parameter, perform the following steps:
1. Open the menu window containing the parameter to be changed.
2. When the cursor is in position 1, press the button to open the menu window and set the cursor
to the parameter of position 2.
3. Set the parameter value in position 2 using .
4. Press the button to confirm the value and move to position 3.
5. Set the parameter value in position 3 using .
6. Press the button to confirm the value and move to position 1.
7. When the cursor is back in position 1, press to open the previous or next menu window,
or return to the user menu list with .
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Position 2
Position 3
Position 1

1.7 Switching on/off
Switching on/off
Shows the address of the device.
Allows you to turn the heat pump on/off or change the status
EMERGENCY STOP.
You can also select a work program.
Program AUTOMATIC SUMMER/WINTER
When the AUTOMATIC program is selected, you can set the desired
temperatures and times for the transition between the WINTER and
SUMMER programs.
1.8 Calendar
Date/Time
Here you can change the day of the week, date (DD/MM/YY) and time
(HH:MM, 24-hour format) of the control unit.
Changing of time
This allows to set the parameters that determine the time of automatic
change of seasons (autumn-winter / spring-summer).
Night mode
Set here the daily period during which the speed of the compressor and,
if applicable, of the air heater is limited. This function is particularly useful
for limiting noise at night.
Hot water time program / heating time program / cooling time program /
pool time program / heat pump time program
For each day of the week, a program can be set for up to 4 time periods.
An independent time program can be set for HOT WATER, HEATING,
COOLING and SWIMMING POOL services. You can also set the time to
fully turn on and off the heat pump.
Vacation calendar
During the year, up to 3 periods can be set during which the heat pump
remains on or off.
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1.9 Heating
Heating
Allows to activate the operating mode HEATING and set the temperature at
which the heating is switched off. At outdoor temperatures which exceed the
switch-off temperature, the operating mode HEATING is never activated.
The symbol indicates that the time programming of the operating mode
HEATING is activated.
Heating of buffer tank
The default temperature of the heating of buffer tank is displayed and the
temperature difference for start can be set.
Heating groups
Here you can adjust the default values programmed by the technical customer
service for the heating supply temperatures. Each step increases or decreases
the supply temperature by 2 °C.
Remote control of room temperature
Display and set the difference between the preset room temperature
(reference temperature) and the comfort temperature of the corresponding
terminals for each supply group.
Auxiliary heating system X
In this case, the auxiliary heating system can be enabled in EMERGENCY
STOP and SUPPORT mode.
In the operating mode EMERGENCY STOP, the auxiliary system is activated
automatically when an active alarm is present.
In the operating mode SUPPORT, the auxiliary system is automatically
activated for normal heating production according to the technical
assistance program.
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1.10 Cooling
Cooling
Here you can activate the operating mode COOLING and set the switch-off
temperatures for active and passive cooling. If the outdoor temperature is
lower than the switch-off temperature of passive cooling, it is not possible
to activate the operating mode COOLING. If the outdoor temperature is
between the passive and active cooling switch-off temperature, the activation
of PASSIVE COOLING is allowed. If the outdoor temperature exceeds the
active cooling off temperature, the ACTIVE COOLING activation is enabled.
The symbol indicates that the time program of the operating mode
COOLING is active.
Cooling buffer tank
The default temperature of the cooling buffer tank is displayed here and the
temperature difference can be set to start.
Cooling groups
Here the default values programmed by the technical customer service for
heating supply temperatures can be adjusted. Each step increases or
decreases the supply temperature by 2 °C.
Remote control of room temperature
Display and set the difference between the preset room temperature
(normal value) and comfort temperature (DTc) at the respective terminals
for each supply group.
Auxiliary cooling system X
Allows to enable the auxiliary cooling system in the operating modes
EMERGENCY STOP and SUPPORT.
In the operating mode EMERGENCY STOP, the auxiliary system is
activated automatically if there is an active alarm that prevents the
compressor from starting.
In operating mode SUPPORT the auxiliary system is automatically
activated for normal operation COOLING as programmed by the
technical service.
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1.11 Water heating / protection against legionella
Hot water
Here you can activate the operating mode HOT WATER and set the
difference between the default temperature of the hot water tank and the
starting temperatures. You can also set the default hot water post-heating
temperature for the water heating system.
The symbol indicates that time programming of operating mode
HOT WATER is active.
Additional hot water X
Here, the hot water auxiliary system can be enabled in the operating modes
EMERGENCY STOP and SUPPORT.
In the operating mode EMERGENCY STOP, the auxiliary system is activated
automatically if there is an active alarm that prevents the compressor from
starting. In operating mode SUPPORT the auxiliary system is activated after
the compressor has failed to reach the set temperature of the hot water tank.
Hot water circulation
Allows to set 4 periods for each day during which hot water circulation is
activated.
The difference between the default temperature of hot water circulation and
the starting temperatures can also be set.
Legionella Protection program
Here you can define the weekly program for Legionella protection.
The Legionella Protection program is automatically deactivated if the
temperature set by the technical service has not been reached after 5 hours.
The Legionella Protection program is recommended to be used at night or
when hot water is not consumed.
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1.12 Swimming pool
Swimming pool
Allows to activate the operating mode SWIMMING POOL.
It is possible to set the percentage of minutes/hours during which the heat
pump is running in the mode SWIMMING POOL, if in the program WINTER
there is a need for heating and swimming pool at the same time.
The difference between the default temperature of the swimming pool and
starting temperatures can be set.
The symbol indicates that the time programming of the operating mode
COOLING is active.
Auxiliary system Swimming pool X
Here you can enable the auxiliary system for the SWIMMING POOL in
operating modes EMERGENCY STOP and SUPPORT.
In the operating mode EMERGENCY STOP, the auxiliary system is activated
automatically if there is an active alarm that prevents the compressor from
starting.
In the operating mode SUPPORT, the auxiliary system is automatically
activated for normal operation of the operating mode SWIMMING POOL
according to the programming made by the technical customer service.
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1.13 Information
Brine/heating
The supply and return temperatures, the temperature difference, the actual
pressure and the adjustment percentage rate of the circulation pumps in the
brine and heat production chain are displayed.
Outdoor temperature
The actual outdoor temperature is displayed.
Room terminals
In installations with bus-connected room terminals (Th-T or TH sensors), the
preset room temperature (setting value), actual temperature (T-real) and actual
relative humidity (RH) of the terminal assigned to each supply group are
displayed.
Heating buffer tank / cooling buffer tank
The default temperature, the difference between the starting temperatures and
the actual temperature of the buffer tank are displayed.
Heating and cooling buffer tanks both have own menu window.
Heating groups / Cooling groups
For each supply group, the preset supply temperature, the actual supply
temperature and the adjustment percentage rate (Reg) are displayed.
Both the heating and cooling supply group have their own menu window.
Hot water tank
The default temperature, the difference between the starting temperatures
and the actual temperature of the buffer tank are displayed.
Actual measuring value / monthly measuring value / yearly measuring value
These menu windows contain information on heat pump consumption,
capacity, input energy and energy output.
The menu windows contain information about current, monthly and annual
values.
Active demand
Actual demand for starting the compressor is displayed in the upper area.
The bottom area shows the demand that the heat pump receives to start the
different supply groups.
The fact that there is an active demand for a compressor or supply groups
does not necessarily mean that they must be in operation. There may be other
reasons that prevent their start.
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Version
Information about the application installed on the controller is displayed here.
1.14 Alarms
The button quickly opens the Alarms menu in the main menu window.
Alarms
These menu windows show the alarms that are currently in progress that
may prevent the compressor from starting.
The button is illuminated continuously.
Clearing alarms
The heat pump is deactivated and switches to operating mode EMERGENCY
STOP if the critical alarm is repeated more than 5 times a day. In this case,
the heat pump can be released again in this menu window after correcting
the problem.
Alarm register
The heat pump records information for the last 50 alarms.
In this menu window, the historical alarm data register can be accessed by
pressing the button .
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1.15 Faults
The heat pump continuously monitors a number of parameters. If any parameter is out of range, the control unit
activates the alarm and generates an error message, which is registered in the ALARMS menu.
If there is a malfunction, the heat pump will not allow the compressor to start. To indicate the presence of a fault,
the button illuminates continuously in red and the operating mode EMERGENCY STOP is activated
automatically.
Depending on the type of problem, different situations may arise.
Active alarms
Active alarms indicate malfunctions occurring at this time. At the beginning of the ALARMS menu, successive
menu windows are displayed, showing the text with the reason for the alarm. The button illuminates
continuously in red and is displayed in the menu window .
If the problem is corrected, these alarms will be cleared and the heat pump will continue to operate automatically.
The button then flashes red to indicate that an error has occurred but has been corrected. When the alarm
register is opened, the button will no longer illuminate.
Locked due to repeated alarms
There are a number of critical malfunctions in the operation of the heat pump, in which a permanent shutdown
is activated if the malfunctions are repeated more often than 5 times a day. The button illuminates
continuously in red and is displayed in the menu window .
Even after eliminating the problem, such a lock must be manually removed from the ALARMS menu so that the
heat pump can be put into operation again.
Register of historical alarm data
The ALARMS menu contains a historical data register that contains information about the last 50 errors.
In the event of a malfunction of the heat pump, the electric hot water heater must be
activated from the rotary switch in the electrical cabinet.
In case of malfunction of the heat pump, the electric emergency heating of the heat pump
must be activated on the heat pump display.
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1.16 Comfort issues
Feature Possible cause Corrective action
The compressor does not start.
Fault in power supply. Check the fuses.
The heat pump is switched off. The
Main Menu window displays .
Switch on the heat pump.
Locking due to repeated alarms.
illuminates continuously in red.
The Main Menu window displays .
Cancel the lockout caused by the alarms.
The time programming of the heat
pump is activated. The Main Menu
window displays .
Set or deactivate the time programming of the heat pump.
STAND-BY appears on the display. No service is needed. Check if there is a need.
Waiting for the compressor to start is
active. The Main Menu window
displays .
.
Wait until the specified time xx has elapsed.
The EVU signal is active. The Main
Menu window displays .
Wait until the EVU signal is deactivated.
Low temperature of hot
water.
The hot water programming is active. Configure or turn off hot water time programming.
Night time programming is active.
The Main Menu window displays .
Set or deactivate night-time programming.
The hot water mode is deactivated. Activate hot water mode.
The hot water mode is switched off
using the remote control.
Deactivate the hot water remote control.
The temperature of hot water lies
between the default temperature
and the temperature difference.
Increase the default temperature and or decrease the gap
between the starting temperatures.
Temporarily high peak demand. Wait 15-30 minutes and check the temperature of the hot
water again.
Room temperature:
HEATING in low operating mode,
COOLING in high operating mode.
Incorrect work program. Select the appropriate program.
Operating mode HEATING/COOLING
is deactivated.
Activate the operating mode HEATING/COOLING.
The outdoor temperature is higher/lower
than the heating/active cooling/passive
cooling off values.
Set the shut-off temperature for heating/active cooling/
passive cooling.
Time programming is activated for
operating mode HEATING/COOLING.
Set or deactivate the HEATING/COOLING time
programming.
Night mode programming is activated.
The Main Menu window displays
.
Set or deactivate night-time programming.
The compressor operates and reaches
the specified supply temperature.
Set the heating/cooling curve and inform the technical
service.
Room terminals do not present a
demand for the heat pump.
Set the default temperature for the room terminals.
Temporarily strict requirements for
air conditioners.
Wait a few hours and check the room temperature again.
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