Change-Over Coil For Heating/Cooling Function - SystemAir SAVE VTC 200-1 Service & Accessories Installation Manual

38 | Accessories
Installation and connection
1. Install the ground heat exchanger (GE) at least 100 mm
distance from the unit in the outdoor air duct. Relay
(RL) is used to control the ground heat exchanger. Con-
nect the relay to any free digital output on the connec-
tion board (CB).
2. Connect the ground heat exchanger (GE) and the
power supply to the relay (RL). A circuit breaker (BRK)
is not included in the package and must be ordered
separately. It must be installed in the circuit.
3. Install a duct temperature sensor (OAT) before the
ground heat exchanger in the outdoor air duct and con-
nect it to any free analog input on the connection board
(CB).
Configuration
1. Go to Service menu.
2. Enter password (default 1111)
3. Go to Components > Extra Controller > Extra Controller Mode menu and select GEO Exchanger option.
If necessary change settings in the menus Configure preheater settings and Configure precooler
settings.
4. Configure control signal. Go to Service > Output > DIGITAL menu. Select the digital output to which the ground
heat exchanger is connected. Example if it is connected to DO3 on the connection board, then select DIGITAL OUT-
PUT 3 and select Start/Stop Circ. Pump, Y4 Extra Controller from the output type list.
5. Configure internal outdoor temperature sensor as extra controller temperature sensor. Go to Service > Input >
ANALOG > ANALOG INPUT 1 and change input configuration from Outdoor Air Temp. Sensor (OAT) to Extra
Controller Temp. Sensor (ECT).
6. After sensor configuration is changed, select analog input to which the newly installed duct temperature sensor
(OAT) is connected and configure input as Outdoor Air Temp. Sensor (OAT).
6.3.5

Change-over coil for heating/cooling function

Change-over coil can be used for both heating and cooling based on the demand.
Important
The change-over (heating/cooling) system can be implemented in many different ways and may vary in
each household. This description explains the most common solution for connecting and controlling heating
and cooling with a water coil and a heat pump.
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