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overall energy consumption of the system while
maintaining system control.
Systems should be designed to avoid HGBP whenever
possible. For more information about HGBP, refer to the
Engineers Newsletter, "Hot Gas Bypass – Blessing or a
Curse?" (ADM-APN007-EN).
Humidifier Piping and
Connections
These instructions cover the piping installation for Trane's
building steam humidifier panel and atmospheric steam
humidifier panel. The humidifier panel shall arrive
installed in the unit air cabinet.
Units with a humidifier panel to be used with building
(boiler) steam will also receive the following piping
accessories shipped direct from the humidifier vendor to
the jobsite address.
•
Inverted bucket steam trap (to be used to drip steam
supply to control valve)
•
Control valve
•
In-line Y strainer (to be used prior to the control valve)
•
Float and thermostatic steam trap (for condensate
drainage of header, two required)
Units with a humidifier panel to be used with atmospheric
distribution of steam generated by electric or steam-to-
steam humidifiers (steam generating) are not supplied
with piping accessories. Piping will be determined by
requirement of field-provided steam generator.
All accessories listed above will be on the packing slip.
Report any shortages immediately. If accessories have
been damaged in transit, notify Trane and file claim with
the transportation company. If your order covers more
than one package, segregate complete assembly.
Equipment tagging will be the same as shown on the
packing list.
All piping accessories should be installed in accordance
with all applicable building, plumbing, and electrical
codes.
Condensate discharged from the humidifier separator/
header is essentially atmospheric pressure. Thus
condensate must be discharges to a drain or pumped. On
many applications, an attempt to lift condensate even a
few inches will lead to potential flooding or spitting
problems from the multiple tube bank. Avoid master
trapping the two connections to one steam trap. If traps
discharge into a common return, install check valves (low
opening pressure) on the outlet of each trap.
Supplying quality steam (not wet) to the humidifier panel
is an important component for proper operation. Care
must be taken that the main supply header is dripped
sufficiently as well as the runout piping to the control valve
and header. The entire system must be designed and
hooked up to prevent accumulation of condensate at any
CLCH-SVX013B-EN
point. The following recommendations will help to ensure
this.
Use drip legs and traps at all low spots or natural drainage
points such as:
•
Ahead of risers
•
End of mains
•
Ahead of expansion joints or bends
•
Ahead of valves or regulators
Install drip legs and drain traps even where there are no
natural drainage points.
Figure 66. Building (boiler) steam panel piping
D
C
Control valve
From boiler
Strainer
Drip leg
Header
Angle iron
mounting frame
F&T trap
1-in./12-in. slope
Drain
1-in. air gap
Drain
F&T trap
Remodel, Retrofit, or
Replacement
Inevitably, older condensing units and evaporator
systems will need to be replaced or retrofitted. Due to the
phase-out of many of these older refrigerants, the major
components for those older units or systems may no
longer be available. The only option will be to convert the
system to R-410A, POE oil, and R-410A components.
When upgrading an existing refrigerant split system due
to remodel, retrofit, or replacement, the entire system
must be reviewed for compatibility with R-410A and POE
oil. Each and every part of the split HVAC system MUST be
compatible with the properties of R-410A refrigerant and
POE oil. In addition, ensure the existing electrical service
is adequate for the product being installed.
Piping and Connections
E
F
Plan view
A
C
Overall width
B
Overall
height
Side view
Active tubes
Inactive tubes
Elevation view
49
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