46
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
FIGURE 46-1: OUTDOOR ENCLOSURE FREEZE PROTECTION PIPING
RTS humidifier in Outdoor Enclosure installed on rooftop
Vacuum breaker (by installer) (See Note 2)
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
6 gpm electric valve
(by installer)
(See Note 2)
Optional location for water
tempering device (See Note 7)
Roof decking
Detail A
120 V
(230 V in
Europe)
N
To supply and
drain valves (by
installer)
(See Note 2)
To RTS RX
humidifier
OM-8104
Drain line minimum 1½" (38 mm)
Domestic water, 25-80 psig
(582 kPa) maximum
Normally open (fail open) minimum
6 gpm electric valve (by installer)
(See Note 2)
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 RTS; if the power goes off, water drains out of the fill line to prevent
freezing (see above). If these valves are used, a vacuum breaker needs to be installed on the fill line near the unit.
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 RX and safety valves to stop fill water to the Model RX 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. In order for the mechanical tempering to work during a power outage, pipe the cold water supplying the water tempering device ahead of the
field-installed additional valves mentioned in Note 2.
6. DriSteem is not responsible for any freeze related damage to the humidifier or lines leading to the humidifier.
7. If mechanical tempering device is relocated outside of the enclosure, an air gap or vacuum breaker is required to be installed within 6 vertical
inches (152 mm) of the drain port on the tank.
Open drain (See Note 4)
Domestic water,
25-80 psig (582
kPa) maximum
Water hammer arrestor (by installer)
Outdoor enclosure:Freeze protection piping
INSTALLATION
Mechanical water
tempering device
