SAVE VTR 500 SERVICE AND ACCESSORIES INSTALLATIONV1

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Accessories
Installation and connection
1. Install change–over coil in the duct. Install a water pump if necessary. The turning on and off of water pump should
be controlled with a relay (RL). Connect the relay to any free digital output and 24 V on the connection board. Then
connect the power supply and a water pump (CWP) to the relay.
2. Connect a control signal wire (if available) of the heat pump (HP) to any free digital output and 24 V on the connec-
tion board.
3. Connect cooling and heating start signal wires to any free digital outputs on the connection box. Relays (RL) must be
used.
4. The frost protection sensor (FPT) should be strapped on a surface on the return water pipe. Connect the frost protec-
tion sensor (FPT) sensor to any free analog input.
5. An internal supply air temperature sensor (SAT, default connection AI2 on the main circuit board) must be replaced
by a duct temperature sensor which can be acquired as an accessory. A duct temperature sensor must be installed in
the duct after heater/cooler. Connect the duct temperature sensor to analog input 2 (AI2) replacing the internal sup-
ply air temperature sensor.
Note:
A duct temperature sensor can be connected to analog inputs 6–7 on the connection board for better
access and then configured as a supply air temperature sensor. However the internal supply air
temperature sensor must be disabled in the control panel first.
6. A thermostat can be used to send signals (change-over feedback) regarding which actual medium (hot or cold) is
currently in a pipe. This signal can be also sent directly from the heat pump if such function is available. If heating is
demanded but only cold water/refrigerant is available - heating is deactivated).
Connect a change-over feedback wire (THS) to any free digital input and 24 V on the connection board.
Fig. 14 Change-over heating/cooling connections
Configuration
Before change-over heating/cooling can be activated, all components must be configured in the control panel.
1. Go to Service menu
2. Enter password (default 1111)
3. Go to Components menu, select Heater menu and select type as Change-over. Do advanced settings if
necessary.
Go to Components menu, select Cooler menu and select type as Change-over. Do advanced settings if
necessary.
4. Configure control signal of the heat pump or similar device. Go to Service menu. Select Output menu. In next
menu select ANALOG tab. Select the analog output to which the control signal wire is connected. Example if it is con-
nected to AO3 on the connection board, then select ANALOG OUTPUT 3 and select Y1 / Y3 Change-over from the
output type list.
5. Configure heating start signal. Go to Output. Select DIGITAL tab. Select the digital output to which the heating start
signal wire from the heat pump is connected. Example if it is connected to DO1 on the connection board, then select
DIGITAL OUTPUT 1 and select Step Controller Y1 Heating from the output type list.
6. Configure cooling start signal. Go to Output. Select DIGITAL tab. Select the digital output to which the cooling start
signal wire from the heat pump is connected. Example if it is connected to DO2 on the connection board, then select
DIGITAL OUTPUT 2 and select Step Controller Y3 Cooling from the output type list.
7. Configure frost protection sensor (FPT). Go back to Input menu. Select ANALOG tab. Select the analog input to which
the frost protection sensor is connected. Example if it is connected to AI6 on the connection board, then select ANA-
LOG INPUT 6 and select Frost Protection Temperature Sensor (FPT) from the input type list.
8. Configure temperature feedback signal from the pipe or heat pump. Go to Input menu. Select UNIVERSAL tab. Se-
lect the universal input to which the feedback wire is connected. Example if it is connected to UI1 on the connection
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