Nortec Industries GS Series Control Installation, Plumbing, Fill Water Supply Line, Drain Line

CONTROL INSTALLATION

￿Mount any wall humidistat (control or high limit) over standard electrical box at height similar to typical thermostat. Any wall humidistat should be in location representative of overall space being humidified and not in path of blower pack or air supply grille. Do not mount on an outside wall where temperature fluctuations can affect control response.

￿Mount duct humidistat in location representative of overall air humidity, usually in return duct. Do not mount it directly in front of steam distributor or in turbulent or mixing zone. Mount humidistat where air's humidity and temperature are uniform and representative of spaces being humidified.

￿Mount duct high limit humidistat downstream of steam distributors far enough that, under normal humidity and air flow conditions, steam will have been fully absorbed (typically at least 10 feet). It must be located to sense high humidity only when uniform and representative air is over-humidified or approaching saturation.

￿Mount duct air-proving switch so that it is able to sense air flow or lack of it. Wire it to make when air flow is sensed and break when air flow fails.

￿Check operation of all on/off controls before starting humidifier.

￿Calibration of controls (on/off or modulation) in the field may be necessary due to shipping and handling. Verify humidistat accuracy before commissioning system.

PLUMBING

NOTE: All water supply and drain line connections should be installed in accordance with local plumbing codes.

FILL WATER SUPPLY LINE

￿Each unit is supplied with an adapter for the fill valve (½”NPT ). Fill rate 10 l/min all unit sizes. Size of piping is a minimum ½” copper, recommend ¾” up to within 4 feet of unit.

￿Standard fill valves are sized for water pressure ranging from 30 to 80 psig (ideally 55 to 60 psig). For other pressures, consult factory. This pressure should be measured at the humidifier if the water pressure is suspect.

￿It is recommended to have a faucet installed close to the humidifier to allow quick filling of the system on initial start up. This can also be very useful for mandatory cleaning of the unit.

￿ALWAYS supply and install a shut off valve and union in the water supply line dedicated to the humidifier to facilitate servicing.

￿If water hammer occurs, install a shock arrester on the fill water line just before the inlet to the fill valve. Water hammer will damage the fill valve.

￿A 1” air gap is designed into the fill system of the GS humidifier. Some local plumbing codes may still require the installation of a double check valve on the fill line to the humidifier to prevent contamination of the supply water system. Verify with local codes and install if necessary.

Figure # 11

Plumbing Connections

1/2” NPT Water Supply (by Nortec)

Union

(by others)

Check Valve
(by others,	Manual Shut-off
if required)
	(by others)

3/4” O.D. Drain

(Hose clamp by Nortec)

Manual

Shut-off (by others)

Union

(by others)

Funnel with

Air Gap (by others)

1/2” NPT Female

Auxiliary Drain

DRAIN LINE

￿The humidifier is equipped with a ¾”O.D. Unthread ed drain outlet connection on the side of the humidifier. A vacuum break valve is installed internal to the unit on the drain line. The drain water line must be piped to a drain funnel to provide an air gap before connection to the building drainage system.

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