Nortec MES2 - Manual (Page 18)

15 | Installation
Plumbing
Figure 11: Water Supply and Drain Connection
 All water supply and drain line connections should be installed in accordance with local
plumbing codes.
 Supply water is recommended at 30 to 80 PSIG and 150-1200 Microsiemens (Hardness 0-
12 GPG). Consult factory for water conditions outside of this range. Install water shut off
valve before humidifier to facilitate servicing.
 The drain line should not end in a sink used frequently by personnel, or where plumbing
codes prohibit it. Route to a floor drain or equivalent for safety reasons.
 Ensure drain line is adequately sized to provide free and easy draining and that an air gap is
installed as shown. A restricted drain can cause cylinder water to over concentrate and
result in poor operation.
 If a drain is not located near the humidifier use a condensate pump rated for hot drain water
such as Nortec’s P/N 1429527.

For humidifiers installed in some cities including the City of Los Angeles:
 A city-approved spring-loaded double ball CHECK VALVE must be installed by
contractor on the potable water inlet to the humidifier. Recommended valve
manufacturer: Watts Regulator, Size 3/8” inlet and outlet, Model #7.
 Each drain line from the humidifier must be routed, without dips or sags, to
terminate above the flood level rim of a city approved indirect waste receptor.
0.875 in. (22 mm). OD
un-threaded outlet
Always install a water
shut-off valve.
1/8 in. NPT
fill connection.
Air gap recommended.
1 1/2 in. to 7/8 in.
Copper reducer is ideal.
(Nortec option P/N 2522172)
Hose must not touch the bottom
of the funnel.
Min. 7/8 in. OD drain line.
Ensure adequate slope to
handle flow.
Use 1/2 in. OD copper
to within 4 ft (1.2 m) of
humidifier
*Elbows, pipe, water shut-off valve, and air gap reducer not supplied by Nortec.