Nortec Industries GS Series manual Cleaning the Steel Tank, Figure #26 Cleaning Tank Access

￿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.

Figure #26

Cleaning Tank Access

Torque: 50 in-LB (5.7 NM)

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