Nortec Steam Humidifiers manual Introduction, Resdelux Operation, Control Installation

current) across terminals 1 and 2 on the low voltage control terminal.

Caution: This is the “common” wire from the transformer that is connected to the ground. It will short on/off control loop if it touches a grounded metal surface.

A - Wall or Duct Mounted Control On/Off Humidistat: Wired to close when there is a drop in humidity and open when the setpoint is reached. Set to desired % RH.

B - Duct Mounted Safety High Limit On/Off Humidistat (if used): Wired to close when there is a drop in humidity and open when the safety setpoint is reached. Set to approximately 85% RH as a safety to help prevent saturation and wetting in the duct (not required when using blower pack kit).

C - Duct Mounted Safety Air-Proving On/Off Switch (if used): Wired to close when sensing air flow and open when no air flow is sensed. Used as a safety to prevent saturation of the duct when there is no air flow (not required when using blower pack kit).

Figure #14

External Wiring Of On/Off Controls

	A
	B
	C
External	1	2
Internal

1.NORTEC offers various versions of A, B and C to suit each application. In general, A is essential for in space applications, C is essential for induct applications, whereas B is highly recommended in ducted applications.

2.Field wiring from the humidistat to the humidifier and between devices should be a minimum of 18 AWG and kept as short as possible.

3.Low voltage control terminal strips are provided in the electrical compartment. Internal sides are factory wired. External sides are for field wiring. (See Figure #14).

4.Each humidifier is supplied with a wiring diagram inside.

Control Installation

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

2.Duct Humidistat: Mount the duct humidistat In a location representative of overall air humidity, (usually the return duct). Do not mount it directly in front of the steam distributor or in a turbulent or mixing zone. Mount it where the air’s humidity and temperature are uniform and representative of spaces being humidified.

3.High Limit Duct Stat: Mount the duct high limit humidistat downstream of the 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.

4.Duct Air Proving Switch: Mount the duct air-proving switch so that it is able to sense air flow or lack of it. Wire it to close when air flow is sensed and open when air flow fails.

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

Note: For wiring interface with a fan, see wiring diagram provided on page 13. Steam humidifier will turn on fan when increase in humidity is required.

OPERATION

INTRODUCTION

The NORTEC RESDELUX humidifier is designed to provide clean steam humidification at an economical price. It utilizes NORTEC’s patented electronic Auto-Adaptive internal control system for high efficiency and low waste of water and electricity.

RESDELUX OPERATION

When the humidifier is first turned on, the controller starts with a self test procedure, which takes about 10 seconds. The test consists of activating for a short time the drain valve, fill valve, and power relays. The sound of the working solenoids is an indication of

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