15
ULTRA-SORB MODEL XV INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
CONTROL OPTION #2 – ELECTRIC TEMPERATURE SWITCH ONLY; CONTINUOUS HEAT
EXCHANGER OPERATION
The DriSteem control cabinet is not provided. An electric modulating control
valve is controlled by a 2-10 VDC/4-20 mA signal from a control system (BAS)
or modulating humidistat. Optional air fl ow switch, high limit humidistat are
wired in series with 24 VAC control circuit of the modulating control valve. See
the wiring diagrams provided with the unit.
ELECTRIC TEMPERATURE SWITCH
Install the temperature switch (Figure 20-1) to prevent the header
from flooding with condensate if the heat exchanger cools, such as if
the condensate return main becomes flooded or the trap fails closed.
DriSteem's temperature switch is a temperature-actuated make-break
switch. The temperature at which it switches is adjustable and should be
set at 210 °F (99 °C).
• Install the sensing element of the temperature switch in the condensate
return piping between the Ultra-sorb heat exchanger outlet and the
inlet to the steam trap, as shown in Figure 20-1. Include a tee with
a 1/2" (DN15) pipe thread opening to receive the sensing element.
When steam surrounds the sensing element, the switch will “make,”
allowing the steam dispersion panel valve to open.
• Install all wiring according to national and local electrical codes, and
size transformer VA to load VA.
• When using a temperature switch to control the on-off heat exchanger
valve, follow the wiring instructions supplied with the modulating
humidification-steam control valve.
CONTROL OPTION #3 – PNEUMATIC TEMPERATURE SWITCH ONLY; CONTINUOUS
HEAT EXCHANGER OPERATION
The DriSteem control cabinet is not provided. A pneumatic modulating control
valve is sent a 3-15 PSI signal from a pneumatic humidistat or other pneumatic
device, to modulate the valve based on humidity demand.
• The 2-position shutoff valve is not used. Steam supply to the panel’s
internal heat exchanger is continuous.
PNEUMATIC TEMPERATURE SWITCH
Install the pneumatic temperature switch as shown in (Figure 20-2). The
temperature switch will prevent the header from flooding with condensate
by closing the modulating steam valve if the heat exchanger cools (if
the condensate return main becomes flooded or the trap fails closed).
DriSteem's pneumatic temperature switch is a temperature-actuated open-
closed pneumatic switch. The pneumatic signal (3-15 PSI) is maintained
above 210°F (99°C) and is opened (bled off) below 200°F (93°C).
Controls
INSTALLATION
