Nortec SETC Outdoor - Manual (Page 16)

13 | Installation
Freeze Protecting Water Supply
Figure 9: Freeze Protecting Water Supply
Caution:.
When installing the SETC Outdoor in condition where the temperature may drop below
0ºC (32 ºF) always follow these guidelines to protect the water supply line from
freezing. A frozen and burst water line can cause serious damage to property.
 Heat trace and insulate the water supply line all the way up to the fill valve.
 In case of power shut off or power failure the water supply line will not be protected
from freezing by the heat trace. Water trapped in the supply line may freeze and
cause damage. Install the valve system outlined below to shut off water inside the
building and drain any water in the supply line. Valves, fittings, insulation and heat
trace shown are not supplied by Nortec.
Normally Open Valve
Normally Closed Valve
To Humidifier
To Drain Water Supply Line
Remote Relay Board
in humidifier
Error
Relay
NO
COM
NO
COM
NO
COM
NC
NO
COM
NC
24 VAC
(From Transformer)
Ground
Inside Building
Heat trace
and insulate