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35
Installation
Nortec EL/RS Outdoor
2584597_B_EN_1705
5.6.2 External Freeze Protection System
In cold climates, the external freeze protection system (supplied by others) is an important part of the
protection for the Nortec EL/RS Outdoor humidifier against freezing. The external freeze protection
system must be installed correctly and fully functional at all times.
IMPORTANT!
The warranty does not cover damage to the humidifier resulting from freezing.
5.6.2.1 Normally-Open and Normally-Closed Valves
This arrangement consists of a normally-open and a normally-closed valve installed inside the building
to protect the water supply line from freezing. Refer to
.
The water supply flows to the fill valve through the normally-closed valve and a tee. This valve remains
closed unless it is energized by the humidifier. This stops the water flow into the humidifier when there
is no demand, or in the event of a power failure.
At the same time, a normally-open valve which is also connected to the tee remains open unless it is
energized by the humidifier. This allows any water in the line (from the tee to the fill valve) to drain as
long as there is no demand on the humidifier, or in the event of a power failure.
The electrical connections are shown in
When there is a demand for humidity, the normally-closed valve opens, and the normally-open valve
closes to permit water flow to the fill valve.
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 15:
LV / XE2
2
3
4
5
6
7
8
1
9
N
L
To Fill Valve
Water supply
To drain
Building Interior
24
V
A
C
GND
120
V
A
C
1
2
3
4
5
6
NO
NC
Humidifier
Normally-Open and 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-open valve (supplied by others)
6
24 V normally-closed valve (supplied by others)
Содержание EL SERIES
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