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Issue 2.0

Installation

1.  IMPORTANT

: ensure all electrical connections are isolated before commencing any work on the 

unit.

2.  Unscrew the 4 security screws using MS Electronics tamperproof screwdriver MSD-152 to 

remove the front cover.

3. 

Mount the unit securely using any suitable fixing in conjunction with the mounting holes 

provided in the unit.

4.  Connect the wiring as shown in the diagram (or any suitably appropriate form) using the 

convenient pluggable terminal blocks provided.  Make sure to choose the correct output 

terminals that are suitable to your application (their operation is described in the ‘Product Wiring’ 

section).

5.  On the remote sensor version, 2-core screened cable should be used to connect the remote 

sensor to the thermostat.  The screen should be connected to the earth terminal ONLY (do not 

connect the screen to anything at the remote sensor end).

6.  Adjust the internal controls to suit the installation operational requirements (see below).

7.  Replace the cover securely using the 4 security screws.

Operation

1.  IMPORTANT

: ensure all electrical connections are isolated before commencing any work on the 

unit.

2.  Adjust the “Setpoint” dial to the relative humidity level the room is to be regulated to.

3.  Set the “Differential” to the total relative humidity swing either side of the “Setpoint” that the 

room humidity is required to keep within.

4.  Set the “Off Timeout” dial to the number of hours that humidity control can be disabled for 

before it is automatically re-enabled.

5.  Example of a typical set-up:

 

Setpoint set to 55% RH  

 

Differential set to 4% RH 

 

Off Timeout” set to 10 hours  

 

In the 

ON

 mode the unit will maintain the humidity between  53% RH and 57% RH.

 

The unit will permanently maintain this control unless it is switched 

OFF

 via the pushbutton.  

 

After 10 hours in the 

OFF

 mode the E914 will automatically revert back to the 

ON

 mode. 

Technical Specification

Power supply:

220V - 240V AC 50Hz (live/neutral/earth)

Output switch rating:

16A, 250V AC 50Hz (resistive)

Output switch type:

Changeover relay (volt-free)

Humidity control:

5% RH to 95% RH

Humidity differential:

1% RH to 10% RH

Sensor accuracy:

+/- 3% RH

Sensor drift:

+/- 1.2% RH over 5 years (no calibration 

required)

Guarantee:

5 Years

Weight:

0.33Kg

Dimensions:

120mm x 95mm x 35mm

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