Carel SD User Manual download pdf (Page 17)

Installation, Operating & Maintenance Manual

1.6 Connect Control Wiring

A typical humidifier control system includes a wall or return duct sensor or controller, a high limit duct humidistat

and an air-proving switch. Placement of these devices is critical to proper operation of the overall system.

1.6.1 Controls Placement

(See following diagram)

The return air RH sensor must always be located BEFORE any outside air intake, in order to insure accurate

sensing of the air from the space. Alternatively, a room RH sensor or humidistat can be used. Room sensors

should be located on an inside wall or post and should not be hit by any discharge air streams from ducts. In a

100% outside air system, the RH sensor may be placed in the supply duct, at least 10 feet down stream of the

distributor pipe to act as both hi-limit and control.

The airflow sw itch must be positioned to accurately open on a loss of airflow, to prevent the humidifier from

running when there is no air to absorb the moisture.

The hi-limit humidistat must be positioned far enough down stream of the steam distributor pipe(s) to prevent

it from getting wet, but still allow it to accurately prevent over humidification of the duct that could result in

condensation.

1.7 Control wiring

The HumiSteam control system allows up to two sensors to be

connected, as well as various safety devices, remote on/off,

alarm and serial communications.

Generally, the control sensor or humidistat (HT) is located in

the room or return air duct. In the case where the HumiSteam

uses a direct discharge blower unit, this is the only control

needed. In ducts or air handlers, a high limit humidistat or

sensor is usually added to act as a safety (CR), as well as an

air flow proving device. The remote terminal HumiVisor (MT)

may be added.

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Carel SD User Manual Page 17