36
Installation
2584597_B_EN_1705
Nortec EL/RS Outdoor
5.6.2.2 3-Way Normally-Closed Valve
This arrangement consists of a normally-closed 3-way valve (instead of the
) installed inside the building to protect the water supply line from freezing.
.
The water supply flows to the fill valve when the 3-way valve is energized by the humidifier. When there
is no demand, or in the event of a power failure, the valve is de-energized and the water in the line is
allowed to drain.
The electrical connections are shown in
In the event the temperature of the water in the (trace heated) line drops below 35 °F (2 °C), the bi-metal
strip (supplied by others) interrupts the circuit and the water supply to the unit is shut off. Any water in
the line is then allowed to drain.
Figure 16:
LV / XE2
2
3
4
5
6
7
8
1
9
N
L
To Fill Valve
Water supply
To drain
24
V
A
C
GND
120
V
A
C
1
2
3
4
5
NC
Building Interior
Humidifier
3-Way Normally-Closed Valve Arrangement
1
Low voltage terminal strip in the humidifier (LV / XE2)
2
Trace heating (supplied by others), minimum 37-41
°
F (3-5
°
C)
3
Bi-metal strip (supplied by others) set to 35 °F (2 °C) and installed around the trace heated pipe
4
120 VAC exterior power supply, trace heating (supplied by others)
5
24 V normally-closed 3-way valve (supplied by others)
Содержание EL SERIES
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