SAVE VTR 700 SERVICE AND ACCESSORIES INSTALLATIONV1 20210507 104848956

Service
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Fig. 8 External connection box and board
Position Description
1
Connection to the main circuit board
2
Connection for external control panel (HMI) or Internet access module (IAM)
3
Modbus RS485 connection
AI6–7
Freely configurable Analog input. None/Input type selection in HMI.
DO1–4
Freely configurable digital output.
DO2 default configuration: Outdoor-/Exhaust Air Damper
DO3 default configuration: Activate Cooling
DO4 default configuration: Sum Alarm
AO3–5
Freely configurable analog output. Actuator type 0–10V, 10–0V, 2–10V, 10–2V.
AO3 default configuration: Heating (only for VTC 200/300/500/700, VTR 100/700 type models).
AO4 default configuration: Cooling
UI1–5
Freely configurable universal input. Can be set as analog input (0–10 V) or a digital input (24 V).
UI1 default configuration: Pressure guard
UI2 default configuration: Cooker hood
UI3 default configuration: Fire alarm
UI4 default configuration: Refresh
24V Maximum current 200mA at 24VDC +-10%.
4.5 Troubleshooting
If problems should occur, please check the items below before calling your service representative.
Fans do not start
1. Check the control panel for alarms.
2. Check that all fuses and fast couplings are connected (main power supply and fast couplings for supply and extract
air fans).
3. Check the week schedule. Fans may be set to OFF in the Schedule airflow settings menu.
Reduced airflow
1. Check the control panel for alarms. Some alarms can reduce the airflow to LOW if active.
2. The unit could be in defrost mode. This reduces the fan speed and in some cases shuts down the supply air fan com-
pletely during the defrosting cycle. The fans go back to normal after defrosting. There should be a defrosting function
icon visible on the home screen if defrosting is active.
3. Speed of fans is linearly reduced when the outdoor air temperature is below 0°C and an outdoor airflow compensa-
tion function is enabled.
4. Check if temporary user mode that reduces airflow is not activated, for example Away, Holiday, etc. Also check dig-
ital inputs Central Vacuum Cleaner and Cooker Hood.
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