Nortec SE Series - Manual (Page 19)

Installation | 16
Nortec supplies a CV valve, actuator and wye strainer with each SE humidifier. The port sizes of
the CV valve, boiler steam inlet port, and condensate drain port are given in Table 3: SETC/P
Specifications on page 7. Follow the following guidelines for installation.

All steam line connections must be installed in accordance with local codes.

Install the CV valve actuator following the procedure in Figure 11: CV Valve Actuator
Installation after the CV valve is installed on the steam line. Wire the actuator as described
in CV Valve Actuator Wiring on page 29.

Boiler steam supply line design is the responsibility of the installer. The boiler steam supply
line must be designed so that that design pressure is present at the CV valve when the CV
valve is completely open (100% demand). The diameter of the supply line up to the wye
strainer may have to be oversized to insure proper steam pressure.

The SE will operate on supply steam pressures between 5 and 15 psi measured at the CV
valve. Lower steam supply pressures will result in lower output. See Table 4: SETC/P
Capacities and Water Consumption on page 7 for capacities at different supply pressures.

If condensate cannot be gravity fed to the boiler then a pump must be used to lift the
condensate. See Spirax Sarco (www.spiraxsarco.com) and others for pumps and additional
information on condensate mananagement.

The boiler steam and condensate connections are independent. Boiler steam condensate
should be returned to the boiler and should not be mixed with water from the tank drain.

The steam supply pressure can be entered into the SETC control software to provide display
of unit output. See Pressure Based on page 56.
Figure 11: CV Valve Actuator Installation
Caution: Condensate leaves the steam traps inside the SE under slight pressure. Steam
flash could occur in the condensate drain line.
1/2 in. (1.2 cm)
min.
Install jam nut
and lock washer
Install stem
extension
Install and
tighten
mounting nut
2 turns then
push in and
1/8 turn to lock
Actuator
CV Valve
Raise valve
stem to full up
Insert
connecting
pin
Turn stem
extension
until holes
line up
Tighten jam nut
against stem extension