Nortec Industries GS Series - Manual (Page 34)

· Ensure that power is switched on again during
periods of demand.
· The GSTC model of the Gas Steam humidifier
includes a pre-cleaning sequence feature. When
activated (through the keypad), the unit will flush
the humidifier, refill with cold water, and flush
again reducing the scale accumulated at the
bottom of the tank.
CLEANING THE STEEL TANK
CAUTION: Water and scale may be hot enough
to cause burns. Turn off humidifier and allow it to cool
before cleaning.
It is recommended that the tank be cleaned at
least once every season to maintain optimum
operation. It may be necessary to increase the
frequency of cleaning or increase the blowdown
setting in areas of hard water or prolonged annual
usage (see the Blowdown Setting section of this
manual).
Cleaning of the humidifier is mandatory and must
be performed on a regular basis.
To reduce cleaning time, use the pre-cleaning
sequence on the GSTC model to help evacuate
mineral debris from the unit. Check the controller
operation to activate this feature.
The combustion chamber walls are usually self
cleaning. The mineral buildup flakes off, due to the
expansion and contraction and violent boiling action
during on/off cycles, and settles to the bottom of the
tank. The combustion end block will have scale build
up, as will the heat transfer tubes. These surfaces
must be cleaned at regular intervals.
Frontal port cleaning will be done through the front
door of the unit. Remove cabinet door on the left of
the LCD display using a Philips screwdriver. Remove
the side tank port opening, by removing the 3 / 16 nuts
(½” key or socket is needed).
Additional clean out ports are available on the top
of the 300/400 and 500/600 lb/h tanks. To access
these ports, remove the top cabinet panel using a
Phillips screwdriver. Remove the top clean out ports
my removing the nuts.
Removal of the heat exchanger(s) is not
necessary to clean the inside of the tank.
Scoop out loose scale with a small shovel such as
those used for gardening. Once loose scale is
removed, use a scraper such as a plastic windshield
scraper to remove scale adhering to the tank or heat
exchanger walls. DO NOT use a metal scraper that
will scratch the stainless steel surfaces of the tank.
Once all large pieces of scale have been removed,
vacuum the tank out with a shop vacuum, fill part way
with water, and flush remaining sediment from the tank
through the drain.
Due to the presence of polymer gaskets around
the heat exchanger, do not use any harsh cleaning
chemicals. Please consult NORTEC prior to using any
chemicals. Once the lid has been replaced, fill the unit
with water and examine for leaks.
Inspect the drain and fill lines assembly for scale
build-up and if necessary remove them from the
humidifier for cleaning. If the blowdown assembly
becomes blocked, scale build-up in the tank will be
accelerated and damage to the humidifier could result.
The drain pump may be opened and cleaned. Consult
NORTEC for proper procedure.
Reassemble the drain and blowdown if they were
removed. Re-install tank top and side lids making sure
tank cover gasket is intact. Do not over tighten hold
down nuts. If using a torque wrench do not exceed
50 in/lb (5ft/lb). Re-seal all cabinet lids.
Cleaning the float chamber is accomplished by
removing the hold down screws to access the floats
and using a small brush to gently clean the scale from
the floats and chamber. Ensure that floats are back in
place and o-ring is properly seated before tightening
screws on float chamber. Special attention must be
used when removing or re-installing the float chamber.
- 30 -
Torque: 50 in-LB (5.7 NM)
Figure #26
Cleaning Tank Access