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Appendix 2.2
Status 14.07.09
We reserve the right to make
changes favouring technical
progress.
Legend to external connection diagram
thermos 200/300 DC
®
WÄRMERÜCKGEWINNUNG
thermos
Mechanical ventilation heat recovery unit incl. summer bypass
Motorised bypass
I Internal motorised temperature-controlled and programmable bypass valve for
bypassing the heat exchanger in summer
Control unit
Modular control unit with integrated control and power electronics in system-specific
configuration
Hot water back-up
duct heater,
(alternative: electric
back-up duct heater)
Use of a hot water back-up duct heater that can be controlled hydraulically via a
thermostatic mixer. The duct temperature is recorded by sensor T5
Ground to air heat
exchanger valve
alternative:
Ground to brine to air
frost protection pump
For changing from direct fresh air intake over to indirect air intake via ground to air heat
exchanger
Pump control for pre-heating / cooling the intake air via ground to brine to air frost
protection
Programmer
Programmer installed in the reference room for manual input of user parameters,
integrated sensor T0 for monitoring the room temperature (alternative: connection of
remote sensor), potential to connect additional programmers with the control system
using the temperature reading of the first programmer
Constant flow control
For the automatic balancing of the incoming/outgoing air flows via analogue flow sensors
Boost switch
For manual boost ventilation (limited in time) – commercially available switch
Additional programmer
Fully functional programmer (except for room temperature recording)
Pump for hot water
back-up duct heater
Feeding the hot water back-up duct heater, is switched on and off by the control unit
Sensor equipment for
electric back-up duct
heater
Comprising: flow indicator, thermal cut-out, and duct temperature sensor for monitoring
the electric duct heater
Power supply
Depending on system configuration: single to three-phase as a function of the connected
loads (electric duct heater, frost protection heater...), with a maintenance, service or
master switch to be provided by the home owner for disconnection from the primary
power supply.
Electric back-up duct
heater
For direct electrical heating of the air as an alternative to the hot water back-up duct
heater. If an electric duct heater is used, the sensor equipment ( ) is absolutely
indispensable. The electric back-up duct heater connects in the place of the pump for the
hot water back-up duct heater. The electric power is limited to max. 2.1 kW..
Frost protection
preheater
Alternative to the ground to air heat exchanger for frost protection of the MVHR unit
Power circuit breaker
Power circuit breaker 16A
T0
Room temperature
sensor
In the programmer, or alternative separate sensor in a reference room, for recording the
reference room temperature used for switching on or off the duct heater
T2
Outdoor temperature
sensor
For recording the outdoor temperature in connection with changeover between direct air
intake and intake via ground to air heat exchanger
T5
Duct temperature sensor
For recording the duct temperature when a hot water back-up duct heater is used, or part
of the sensor equipment of the electric back-up duct heater for recording the duct
temperature (limitation to 50°C)
FZ2
Analogue supply air
flow sensor
For recording the volumetric flow of the supply air
FZ3
Analogue extract air
flow sensor
For recording the volumetric flow of the extract air
FZ4
Duct heater flow
indicator
Part of the sensor equipment of the electric back-up duct heater for detecting the
minimum flow rate required
STB
Thermal cut-out
supply air duct heater
Part of the sensor equipment of the electric back-up duct heater for safe limitation of the
maximum temperature
Summary of Contents for thermos 200
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