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Page 34
2008-10-01
(3) NORTEC recommends the use of insulated hard copper steam lines on distances of
more than 10 feet and no more than 3 elbows (90
⊃). The use of flexible steam hose on
runs of more than 10 feet can reduce these recommended distances in Table 14 by as
much as 25%. Steam hose can crimp and cause back pressure.
Table 14. Maximum Recommended Length of Steam Runs
(4) Steam lines should slope upwards from the humidifier to the steam distributor. (See
Figure 7.)
(5) Flexible steam hose, if used, must be supported to avoid crimps, bends, and sags.
(Please consult local agent if proper slopes are not available.)
(6) If the steam supply line must be routed below the humidifier location, a condensate trap
‘tee’ will be required to prevent blockage at the low point in the steam line. Run the
condensate hose to the nearest floor drain after trapping. (See Figure 8.)
(7) Long steam runs with improper slopes can produce spitting at the distributor because
the steam is travelling at a high velocity and will push condensate out the distributor. If
a slope of 2" for every 12" of steam run cannot be achieved, then condensate must be
removed before the distributor. (See Figure 4.)
B. CONDENSATE RETURN
(1) Each steam distributor has a built-in condensate return. (See Figure 9.) Flexible
condensate return hose (available from NORTEC) is recommended for routing
condensate back into the humidifier’s fill cup, or to a drain. A short length of d" OD
copper tubing is supplied by NORTEC when routing condensate hose back to the fill
cup. Similarly, a short length of d" condensate hose is supplied to serve as a flexible
coupling with field-supplied copper condensate line. Long condensate runs should be
drained to a floor drain to prevent excessive condensate water from entering the
cylinder.
NOTE
Excessively long steam runs (over 20 feet) may require the use of ½" OD condensate
return lines – supplied by others.
Unit Size Steam Output Distance Possible Losses
NH-005 5 lbs/hr 8 feet 1.0 lbs/hr
NH-010 10 lbs/hr 15 feet 1.5 lbs/hr
NH-020 20 lbs/hr 20 feet * 2.0 lbs/hr
NH-030 30 lbs/hr 25 feet * 2.5 lbs/hr
NH-050 50 lbs/hr 40 feet ** 4.0 lbs/hr
NH-075 75 lbs/hr 50 feet ** 5.0 to 10.0 lbs/hr
NH-100 100 lbs/hr 50 feet ** 5.0 to 10.0 lbs/hr
NH-150 150 lbs/hr 50 feet/cylinder ** 5.0 to 10.0 lbs/hr
NH-200 200 lbs/hr 50 feet/cylinder ** 5.0 to 10.0 lbs/hr
* Use one inch copper steam supply for longer runs.
** Use two inch copper steam supply for longer runs.
NOTES: 1. This table gives the maximum recommended length of steam run by unit size.
2. The use of any steam line other than copper or NORTEC supplied steam hose will void the warranty and
may adversely effect the operation of the humidifier.