34
GTS HUMIDIFIER LX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SUPPLY WATER PIPING
• The GTS humidifier has a 2" (51 mm) internal air gap to prevent back
siphoning into a potable water system. However, some governing codes
may require additional protection such as a vacuum breaker or backflow
preventer.
• The supply water pressure range must be 25 psi to 80 psi (172 kPa to 552
kPa).
• The supply water assembly has both a 3/8" (DN10) pipe thread (side) and
1/2" (DN 15) pipe thread (bottom) connection.
• During an integral drain tempering event, cold water in the internal drop
tube may cause a low rolling sound.
• In cases where water hammer occurs when the fill solenoid closes, a shock
arrester is recommended. Reducing the supply water pressure (minimum
25 psi [172 kPa]) or using flexible tubing (rated for 212 °F [100 °C]
minimum continuous operating temperature) may diminish the noise, but
installing a shock arrester is the best solution.
• The end-of-season feature drains the tank when there is no demand for
humidity for 72 hours. (This length of time is a default setting and is
user-adjustable. See the
Vapor-logic Installation and Operation Manual
for
more information.)
• Supply water tubing must be rated for at least 80 psi (552 kPa) at 140°F
(60 °C) continuous service.
INSTALLATION
Supply water and drain
Piping:
Important:
Damage caused by chloride
corrosion is not covered by your DriSteem
warranty. See “Supply water guidelines” on
Table 34-2:
Water tempering specifications
for optional Drain-kooler water
tempering device
Water type
Maximum
Flow rate
Maximum
temperature
U .S .
gpm
L/m
°F
°C
Hot water
inflow
6
22.7
212
100
Cold water
inflow*
6
22.7
90
32
Tempered
water outflow
12
45.4
140
60
* Cold water inflow pressure must be between
25 psi and 80 psi (172 kPa and 552 kPa).
Table 34-1:
Supply water guidelines
Supply water
pressure
25-80 psi
at 6.0 gpm
flow rate
172-552 kPa
Supply water
flow rate
6.0 gpm
21 l/min
Supply water
temperature
34°F to 90°F 1°C to 32°C
DRAIN
The drain line piped from the humidifier must be run to an approved sanitary
waste or suitable drain that accommodates a 12 gpm flow rate. Although
the GTS humidifier is equipped with integral water tempering, if nonmetallic
drain pipe or hose is used, it should be rated for 212 °F (100 °C) minimum
continuous operating temperature.
If vertical drop of drain exceeds 12” (305 mm) a vacuum breaker or open
drain with air gap must be installed within 12 vertical inches (305 mm) of unit.
Failure to do so will create a siphon during drain events, disrupting normal
drain operation and allowing steam to enter the drain through the overflow
p-trap outlet (see Figure 35-2).
Ensure the drain piping configuration (diameter, length, slopes, elbows,
hangers, etc.) supports a 12 gpm flow rate for proper drain operation and to
prevent overflow and spillage from an open drain with air gap.
Do not reduce the size of the drain piping. If the length of the drain piping
exceeds 10' (3 m), increase the pipe size. If combining multiple drain lines
together, ensure proper common pipe sizing practices are used.
