Nortec GS Series - Manual (Page 37)

GS Series Installation | 34
Auxiliary Drain
Standard GS Outdoor units come with a capped ¾”NPT auxiliary drain connection at the bottom of the tank.
It is recommended to install a manual shut-off valve on this connection and route to drain (field supplied air
gap required).
GS Outdoor units standard with a freeze protection package have a normally open drain valve mounted at
the auxiliary drain connection and piping that terminates at the pipe chase in the base pan. This valve
opens and will drain the contents of the tank in the event of a power failure. Install a manual shut off valve
on this line and pipe to the drain funnel. This valve must always be left in the open position when in
operation but can be closed for servicing of the unit.
Drain pipe should be capable of withstanding 212°F (100°C) temperatures.
Steam Lines
The steam outlet connection is located at the back of the GS Outdoor unit. Steam hose(s) and clamps are
supplied with the unit and are intended to provide a flexible coupling outside of the unit to the building
steam lines. See Figure 28.
Figure 28: Steam Connection
GS Outdoor models can develop steam pressures up to 12”w.c. to overcome duct and steam line pressures.
Pressures above 12”w.c. will cause steam to exit through the drain line.
Steam lines can be routed to an air handler on the roof or pipe chased (external to the unit) through the
rooftop to enter the building.
All steam lines must be insulated to reduce losses.
For steam line installation guidelines, consult the distribution system installation manual (Steam Distributor
Installation Manual.