Emerson VH Manuel D’Utilisation

The SETUP OPERATION menu permits the review and/or adjustment of the unit configuration. This 

may include:

This feature, also referred to as Positive Start or Winter Start Kit, allows for the low pressure switch 

to be ignored for the programmed time during a cold start of the compressor. Entering a “0” for this 

time will bypass this feature. A “1”, will bypass the low pressure switch for one minute, a “2” for two 

minutes, etc. The programmed value can be from 0 to 3 minutes. This delay is factory set to 0 for 

water cooled, glycol-cooled, and GLYCOOL

™

 units. Typically, only air cooled units need a “Winter 

Start” time.

This feature allows for the unit to restart automatically after a loss of power. The programmed value 

is .1 minute (6 seconds) intervals. A programmed value of zero (0) would require the user to manually 

press the ON/OFF switch to start the unit, i.e. no auto restart. The purpose of this feature is to pre-

vent several units from starting at the same time after a loss of power. The message “Restart delay -- 

Please wait” will be displayed when the system is in the AUTO RESTART mode. (It is suggested mul-

tiple unit installations be programmed with different auto restart times.)

An autoflush system automatically controls a water makeup valve to maintain proper level in the 

infrared humidifier water pan during humidifier operation. If humidification is needed and 15 hours 

have elapsed since the last time the humidifier was on, then the humidifier is held off until the valve 

completes an initial fill of the humidifier pan. This pre-fill is about 30 seconds. The valve continues to 

fill and flush the pan for about 4 minutes.
During humidifier operation, with the flush rate set at the default of 150%, the valve is opened peri-

odically to add water to the pan (about 40 seconds every 9 and 1/2 minutes of humidifier operation). 

This adds enough water to the pan to cause about a third of the total water used to be flushed out the 

overflow standpipe located in the humidifier pan. This action helps to remove solids from the pan. The 

flush rate is adjustable from 110% to 500%. If the water quality is poor, it may be desirable to 

increase the water flushing action above the normal 150% rate. Also, if the supply water pressure is 

low, the flush rate adjustment can be increased so that sufficient water level is maintained during 

humidification.

This feature will flush the respective coil for three (3) minutes after the programmed number of hours of 

nonuse. For example, if the flush time is programmed with 24 hours on a hot water reheat type system, 

and heating is not required for a 24 hour period, the hot water valve will be opened for 3 minutes to 

allow the coil to be flushed. The programmed value can be from 0 (no flush) to 99 (99 hours of nonuse).

The control can be set to display readings and setpoints in either degrees Fahrenheit (F) or Celsius (C).

See Table 9 below for the list of setup functions, their factory default values and the allowable ranges 

for which they can be programmed.
Table 9

Cold Start Time Delay*

3

0 to 3 min (0 = no delay)

Restart Time Delay

0.1

0 to 9.9 min (0 =manual restart)

Infrared Fill Rate

150

110 to 500%

Chilled/Hot Water

Coil Flush

24

0 to 99 hrs (also Econ-o-coil)

F/C Degrees

F

C or F

*Factory set to 0 for water-cooled, glycol, and GLYCOOL units.