99
ACCESSORIES INSTALLATION
ENGLISH
2Way Valve
2way valve is required to control water flow while cooling operation. Role of 2way valve is to cut off
water flow into under floor loop in cooling mode when fan coil unit is equipped for cooling operation.
General Information
supports following 2way valve.
1) Normal Open type. When electric power is NOT supplied, the valve is open.
(When electric power is supplied, the valve is closed.)
2) Normal Closed type. When electric power is NOT supplied, the valve is closed.
(When electric power is supplied, the valve is open.)
How to Wire 2Way Valve
Follow below procedures Step 1 ~ Step 2.
Step 1. Uncover front cover of the unit.
Step 2. Find terminal block and connect wire as below.
Final Check
Flow direction :
- Water should not flow into under floor loop in cooling mode.
- To verify the flow direction, check temperature at the water inlet of the under floor loop.
- If correctly wired, this temperatures should not drop below 16 °C in cooling mode.
Type Power Operating Mode Supported
NO 2-wire
1)
230 V AC
Energize : Valve Closing
Yes
De-Energize : Valve Opening
NC 2-wire
2)
230 V AC
Energize : Valve Closing
Yes
De-Energize : Valve Opening
CAUTION
!
Dew Condensation
• Wrong wiring can yield dew
condensation on the floor.
If radiator is connected at the under
floor water loop, dew condensation
can be occurred on the surface of the
radiator.
WARNING
!
Wiring
• Normal Open type should be connected to
wire (NO) and wire (N) for valve opening in
cooling mode.
• Normal closed type should be connected
to wire (NC) and wire (N) for valve closing
in cooling mode.
TB 1
(NO) : Live signal (for Normal Open type) from PCB to 2way
valve.
(NC) : Live signal (for Normal Closed type) from PCB to 2way
valve.
(N) : Neutral signal from PCB to 2way valve.
2way valve
(NO) (NC) (N)
15 16 17
L1 L2 N
2WAY VALVE (A)
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