Nortec GS Series - Manual (Page 36)

33 | GS Series Installation
Fill Water Supply Line
Each unit is supplied with a ½” NPT male connection to the fill valve. Refer to Figure 26 for connection
details. A minimum fill rate of 10 l/min (2.6 gal/min) is required for all unit sizes. Allowable pressure range
is 30-80 psig.
Always install a manual shut off within the building to allow isolation of the water to the unit. A union must
be installed on the fill line prior to the fill valve to allow for servicing.
Heat trace fill line piping above rooftop from the pipe chase up to the fill valve.
Drain Line
GS Outdoor units have an integrated 12”w.c. trap and vacuum break valve on the drain line. A drain hose,
connected to the outlet of the internal trap, terminates at the pipe chase in the burner section.
Figure 26: Fill Water Connection Figure 27: Drain Connection
Route the drain hose to a drain funnel in the building to provide an air gap before entering main building
drain/sewage system.
When the drain pump is activated, the tank drains at a rate of 18-20 l/min (7-8 gal/min).
Drain piping must be rated for 212ºF (100ºC).
NOTE: Whenever possible do not expose drain water within the outdoor cabinetry. This could result in water
damage to electronic components. If a drain pan needs to be inside the cabinetry be sure to seal around it
so the cabinet doesn’t become over humidified during the drain cycles.