14
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Outdoor Enclosure
INSTALLATION
Open to drain
Vacuum breaker (by installer)
Disconnect (by installer); see Detail A
120V supply.
Refer to Table 13-2 for electrical requirements.
Open drain
(See Note 4)
Heated building interior
Normally open (fail open) min
1/2" electric valve (by installer)
Optional water seal (P-trap)
drain line, min. 1½" (DN40)
(See Note 3)
Roof decking
Detail A
120 V
N
To valves
(by installer)
(See Note 1)
To STS
humidifi er
OM-7558
Drain line, min. 1½" electric
valve (See Note 3)
Domestic water, 80 psig
(582 kPa) maximum
Normally closed
(fail closed) min
3/8" electric
valve (by installer)
Normally closed fi ll
valve (by factory)
Disconnect
box
120 V from unit
disconnect or other
source (See Note 1)
Make-up water supply
piping (by installer)
(See Note 2)
Open drain
(See Note 4)
Humidifi er
Notes:
1. Insulate supply water piping to avoid dripping from condensation. To ensure that water does not remain in the fi ll line and freeze if there is a loss
of power, DriSteem recommends fi eld installing additional valves upstream of the fi ll valve in a conditioned space. Power these valves on the same
circuit that supplies the STS (as shown above); if the power goes off, water drains out of the fi ll line to prevent freezing.
2. Ensure that water lines are protected from freezing conditions.
• Install heat tracing and insulation on fi ll piping inside the Outdoor Enclosure.
•
In extreme or critical applications in which the unlikely event of a water leak could cause severe damage, DriSteem recommends a thermostat
with a remote sensor on the fi ll line to cut power to the STS and safety valves to stop fi ll water to the STS and drain the fi ll piping when the
temperature is below freezing.
3. DriSteem recommends copper or iron drain piping for Outdoor Enclosures. On a loss of power the tank water will drain, but not be cooled by
the Drane-kooler because of the fi eld supplied safety shut-off valves. If it is critical to keep the Drane-kooler functional in the case of a power loss,
disconnect the Drane-kooler and relocate it down inside the conditioned space of the building. Pipe the supply water for the Drane-kooler before the
safety shut-off valves.
4. If copper or iron piping is used for both the fi ll and drain piping, these drains may be tied together. Locate 1" air gap only in spaces with adequate
temperature and air movement to absorb fl ash steam; otherwise, condensation may form on nearby surfaces. Refer to governing codes for drain
pipe size and maximum discharge water temperature.
mc_011311_1705
FIGURE 14-1: OUTDOOR ENCLOSURE INSTALLATION DETAIL
