25
GTS HUMIDIFIER LX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
FIGURE 25-1: OUTDOOR ENCLOSURE FREEZE PROTECTION PIPING
GTS humidifier in Outdoor Enclosure installed on rooftop
Vacuum breaker (by installer)
Disconnect (by installer); see Detail A
120 V supply (230 V in Europe)
Open drain
(See Note 4)
Heated building interior
Normally closed
(fail closed)
minimum
8 gpm electric valve
(by installer)
Optional Drane-kooler water
tempering device
Roof decking
Detail A
120 V
(230 V in
Europe)
N
To supply and drain
valves (by installer)
(See Note 2)
To GTS LX humidifier
OM-8005
Typical drain line, min. 1½"
Domestic water, 20-80 psig
(582 kPa) maximum
Normally open (fail open) minimum
8 gpm electric valve (by installer)
Drain connection
Disconnect
box
120 V (230 V in
Europe) from unit
disconnect or other
source (See Note 2)
Supply water piping
(by installer)
Piping notes:
1. Insulate supply water piping to avoid dripping from condensation.
2. To ensure that water does not remain in the fill line and freeze if there is a loss of power, use field installed additional valves upstream of the fill
valve in a conditioned space. Power these valves on the same circuit as the GTS; if the power goes off, water drains out of the fill line to prevent
freezing (see above).
3. In extreme or critical applications in which the unlikely event of a water leak could cause severe damage, use a thermostat with a remote sensor
on the fill line to cut power to the Model LX and safety valves to stop fill water to the Model LX and drain the fill piping when the temperature is
below freezing.
4. Locate 1" air gap only in spaces with adequate temperature and air movement to absorb flash steam; otherwise, condensation may form on
nearby surfaces. Refer to governing codes for drain pipe size and maximum discharge water temperature.
5. If drain water tempering is required in the case of a power outage, install a Drane-kooler water tempering device. Pipe the cold water supplying
the Drane-kooler ahead of the field-installed additional valves mentioned in Note 2.
Open drain (See Note 4)
INSTALLATION
Outdoor enclosure: Freeze Protection Piping
Domestic water,
20-80 psig (582
kPa) maximum
Water hammer arrestor (by installer)
Open drain or
vacuum breaker
(by installer)
Install open
drain or vacuum
breaker within
12" (305 mm)
vertical
