Nortec Blower Packs 380V - Manual (Page 8)

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2008-04-28
(8) For electric humidifiers (NHTC & NHPC only) using a small size blower pack (<30
lbs/hr), steam lines require 7/8” O.D. (Nominal ¾”) copper tubing. For steam runs
longer than 20 ft, use insulated nominal 1” copper to ensure draining of
condensate.
(9) When using the GS, SE, or NHRS Humidifiers with a RO / DI water supply, all
steam lines should be in stainless steel.
(10) Do not use plastic pipe for steam distribution or hose other than NORTEC
supplied. Substitution will void warranty.
(11) If steam line is routed below the blower pack, or if the blower pack is lower than the
humidifier, a condensate trap “tee” will be required to remove water at this low
point. Run the condensate from the trap to the nearest drain lower than the blower
pack. See Figure 5 Condensate Removal.
(12) Do not run the steam line more than 1 foot per lb/hr output. Example, 10 lbs/hr
should not have a steam run longer than 10 feet. If long runs are unavoidable, the
humidifier should be sized larger to compensate for condensate losses and
insulated stainless steel or copper must be used.
D. CONDENSATE RETURN LINES
(1) NORTEC blower packs have built-in connections for draining off condensate.
These condensate lines must be connected to the nearest floor drain, back to the
unit (NHTC & NHPC, NHRS only) or a condensate pump when using short
condensate runs.
(2) Always incorporate a trap in routing of condensate return lines. Condensate that
accumulates in trap will prevent possibility of steam escaping. Depth of the trap
must be equal or more than 3” (76 mm) See Figure 6 Condensate Return Line
Trap.
(3) Ensure the trap is at least 3 feet (1 m) below the blower pack and as close to the
floor drain as possible.
E. PRIMARY VOLTAGE CONNECTION
(1) All blower packs for SE and GS unit are wired by others to be powered by an
independent circuit. Follow all codes.
(2) A control thermostat, mounted on the blower pack, automatically starts the fans
when steam is detected.
(3) NH Series remote mounted blower packs wired to a humidifier or independent
circuit require field wiring between two primary voltage terminal blocks and two low
voltage control (class 1 circuit wiring required) terminal strips; one of each located
in humidifier and remote blower pack cabinet. Knock-outs are provided on the
humidifier to facilitate this. To connect the primary and control (class 1 circuit
wiring required) wiring, the wiring is fed through the grommet provided in the
bottom of the blower pack.
(4) Field wiring of remote blower packs must conform to national and local electrical
codes. Refer to wiring diagram supplied at the back of this manual (See page 9).