How To Install, Other Parts - Dantherm HAC 1 Service Manual

How to install, other parts

CO sensor
2
Hygrostat
Standby switch
Alarms
Modbus
Fire thermostat
24
If a CO2-sensor is connected and the unit is set to AUTO mode the airflow is controlled
by the CO2-concentration in the room where the CO2-sensor is placed.
Connect the CO2 sensor delivered by Dantherm Air Handling to terminal J9, which also
provides the 16 VDC power.
If a hygrostat is connected to the system the ventilation unit will speed up to fans speed
3 whenever the preset RH setpoint is reached. (See also the HRC 2 User instruction)
Connect the hygrostat to terminals J8.
The unit can be set to standby mode using closed contact on J8. The unit will stay in
standby mode until the contact is open again.
Caution:
It is only allowed to stop the ventilation unit for 4 hours, unless dampers are installed to
avoid drafting air which can cause condense problems and cold draft issues.
Dantherm Air Handling A/S disclaims any responsibility and negative influence either on
the heat consumption in the house, or the indoor climate or if the unit is installed in
such a way that the building, the building structure and the furniture are damaged.
A General Alarm and a Filter Alarm can be collected on terminal J7.
The red Fail diode (in the Status field) is looking after correct termination of some of the
equipment. I.e. it will be red if both "electrical preheating switch" is turned on and "GTC
sensor" is connected at the same time, because this is not allowed.
On terminal J5 and the connector on the side of the HAC 1 box there is access to the
Modbus protocol of the control system. Ask Dantherm Air Handling for more infor-
mation about this if needed.
In case fire protection system is desired it is possible to connect fire thermostat(s) to
the system on terminal J2. It can be recommended in combination with damper solu-
tions. (see section damper control)