Technical data

Guidelines for Installation
APC NetworkAIR™ FM-DX 55
Water supply to humidifier 1. The humidifier fill valve orifice is sized for supply water pressure
from 15 PSI (103.4 kPa) to 150 PSI (1034 kPa).
2. For cases above 150 PSI (1034 kPa), install a pressure-reducing
valve in the water feed line to the unit.
3. With extremely dirty or muddy water sources, proper filtration is
required on the unit’s incoming water line.
4. DO NOT use softened water with the humidifier. Softened water is
too conductive.
5. DO NOT use completely demineralized water with the humidifier.
The minerals allow the electrode principle to work.
6. DO NOT use a hot water source. Doing so will cause deposits that
will eventually block the fill valve orifices.
7. Water supplies with high conductivity (above 800 mW) must be
preconditioned for proper operation and longevity of the humidi-
fier.
8. Water supplies with low conductivity (less than 125 mW) may
require a low conductivity cylinder (contact the APC configuration
team). When the cylinder is first installed, a teaspoon of salt or an
Alka-Seltzer tablet may be required to start humidification. If con-
ductivity is less than 75 mW, water treatment may be necessary.
Water supply A 16- to 20-mesh strainer must be installed in the water supply to the
water units to prevent clogging of brazed plate condenser. This is a field
item.Also recommended on glycol units.
Note: Because of an ongoing program dedicated to product
improvement, specifications are subject to revisions without notice.
APC assumes no responsibility, and disclaims all liability for damages
resulting from use of this information or for any errors or omissions.