FILL WATER SUPPLY LINE
Each unit is supplied with a ½” NPT male connection to the fill valve. Refer to Figure #21 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
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.
Figure #21
Fill Water Connection
1/2” NPT Connection
Check Valve (If required)
Drain Line
Connection
Manual
(By others)
Pipe Chase
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.
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
Internal drain water tempering will ensure a maximum of 140F (60C) during normal operation.
Figure #22
Drain Connection
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
GS Outdoor units standard with freeze protection 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. See Figure #22. 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 200F temperatures.
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