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Accessories GB
11.3.4 Duct water heater
A duct water heating battery is supposed to be installed in supply air duct.
• WH — water heating battery
• FPT — frost protection sensor
• SAT — supply air temperature sensor
• S — actuator for valve
• 1 — Outdoor air
• 2 — Supply air
• 3 — Extract air
• 4 — Exhaust air
Component/product — Article number:
• VBC 250-2 Water heating battery (2 rows) — 5460
• VBC 250-3 Water heating battery (3 rows) — 9843
• RVAZ4 24A Actuator 0-10V (S) — 9862
• ZTV 15-1,6 2-way valve — 9824
• ZTR 15-1,6 valve 3-way — 9673
• Duct sensor -30-70C (SAT) — 211524
• Surface sensor -30-150C (FPT) — 211523
Installation and connection
1. Install water heater in the duct. Connect pipes, 2/3–way valve and actuator.
Important
Do NOT use 24V DC power output from the connection board for valve actuator.
2. Connect actuator (S) to any free analog output.
3. The frost protection sensor (FPT) should be strapped on a surface on the return water pipe. Connect FPT sensor to
any free analog input.
4. 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 water heater. Connect the duct temperature sensor to analog input 2 (AI2) replacing the internal supply
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.
211480 | B003
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