Field Controls SWGII-5 Manual page 14

PRESSURE SWITCH ADJUSTMENT
Important: Both the CK-41 and CK-81 power
vent control systems have a pressure switch
which must be properly set before the water
heater can be started. The pressure switches
are set so that the contacts will not close
until properly set by the installer. Failure to
carefully follow the procedure below for
setting the pressure switch will either prevent
the water heater from operating properly or
defeat the safety feature of the control which
could allow a hazardous condition to occur
in the event the power venter operates with
a venting malfunction.
1. Attach the ⁄ " tubing connector on
1
4
the pressure tube on the SWG venter.
Connect the supplied
tubing to the tubing connector. Route the
tubing to the power venter control box
and connect the tubing to the pressure
switch. When routing the tubing, avoid
kinking the tubing by bending the
tubing too sharply.
2. Follow the lighting instructions and
light the pilot (millivolt models). Turn
thermostat to the highest setting and
turn on sufficient water flow to keep
the burners on continually. The power
venter should start, but the main burners
will not come on until the pressure
switch is adjusted.
3. Slowly rotate the pressure switch adjustment screw counterclockwise until the contacts close and the
burners fire, then rotate the screw
couple of times to ensure proper operation.
4. Follow the General Installation Inspection section to make sure the pressure switch and venting system
operates properly with all gas appliances and exhaust fans operating.
⁄ " aluminum
1
4
⁄ turn counterclockwise. (See Figure 17) Cycle the thermostat a
1
4
page 14
Figure 17
Figure 16